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examples: cleanup examples directory

Browse Source 
Following changes are done as a part of cleanup:

1. Moved the platform specific `C` examples from top level examples/
directory to platform/ subdirectory and renamed helloedison.c to
gpio_edison.c

2. C specific examples are moved to a new c/ subdirectory. As a part
of this process, examples are modified to follow same standards
and few new examples are also added.

3. Include the newly added C examples to relevant API documentation

4. Ran clang-format for all source files in c/, c++/, platform/
subdirectories

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Manivannan Sadhasivam
2017-11-17 17:22:34 +05:30
committed by Brendan Le Foll
parent 3fb65de4b8
commit e562c774cf
46 changed files with 1542 additions and 1025 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
examples/c/CMakeLists.txt Normal file
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@@ -0,0 +1,36 @@
add_executable(aio aio.c)
add_executable(gpio gpio.c)
add_executable(gpio_advanced gpio_advanced.c)
add_executable(hellomraa hellomraa.c)
add_executable(i2c_hmc5883l i2c_hmc5883l.c)
add_executable(i2c_mpu6050 i2c_mpu6050.c)
add_executable(led led.c)
add_executable(pwm pwm.c)
add_executable(spi spi.c)
add_executable(uart uart.c)
add_executable(uart_advanced uart_advanced.c)
if (NOT ANDROID_TOOLCHAIN)
add_executable(iio iio.c)
endif()
include_directories(${PROJECT_SOURCE_DIR}/api)
include_directories(${PROJECT_SOURCE_DIR}/api/mraa)
target_link_libraries(aio mraa)
target_link_libraries(gpio mraa)
target_link_libraries(gpio_advanced mraa)
target_link_libraries(hellomraa mraa)
target_link_libraries(i2c_hmc5883l mraa m)
target_link_libraries(i2c_mpu6050 mraa)
target_link_libraries(led mraa)
target_link_libraries(pwm mraa)
target_link_libraries(spi mraa)
target_link_libraries(uart mraa)
target_link_libraries(uart_advanced mraa)
if (NOT ANDROID_TOOLCHAIN)
target_link_libraries(iio mraa)
endif()
if (ONEWIRE)
add_executable (uart_ow uart_ow.c)
target_link_libraries (uart_ow mraa)
endif ()

99
examples/c/aio.c Normal file
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@@ -0,0 +1,99 @@
/*
* Author: Nandkishor Sonar
* Contributors: Alex Tereschenko <alext.mkrs@gmail.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Reads ADC A0 value continuously. Press Ctrl+C to exit.
*/
/* standard headers */
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/aio.h"
/* AIO port */
#define AIO_PORT 0
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main()
{
mraa_result_t status = MRAA_SUCCESS;
mraa_aio_context aio;
uint16_t value = 0;
float float_value = 0.0;
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize AIO */
aio = mraa_aio_init(AIO_PORT);
if (aio == NULL) {
fprintf(stderr, "Failed to initialize AIO\n");
mraa_deinit();
return EXIT_FAILURE;
}
while (flag) {
value = mraa_aio_read(aio);
float_value = mraa_aio_read_float(aio);
fprintf(stdout, "ADC A0 read %X - %d\n", value, value);
fprintf(stdout, "ADC A0 read float - %.5f\n", float_value);
}
/* close AIO */
status = mraa_aio_close(aio);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

147
examples/c/gpio.c Normal file
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@@ -0,0 +1,147 @@
/*
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Contributors: Alex Tereschenko <alext.mkrs@gmail.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Toggles GPIO's 23 and 24 recursively. Press Ctrl+C to exit
*
*/
/* standard headers */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/gpio.h"
/* gpio declaration */
#define GPIO_PIN_1 23
#define GPIO_PIN_2 24
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_gpio_context gpio_1, gpio_2;
/* install signal handler */
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize GPIO pin */
gpio_1 = mraa_gpio_init(GPIO_PIN_1);
if (gpio_1 == NULL) {
fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN_1);
mraa_deinit();
return EXIT_FAILURE;
}
/* initialize GPIO pin */
gpio_2 = mraa_gpio_init(GPIO_PIN_2);
if (gpio_2 == NULL) {
fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN_2);
mraa_deinit();
return EXIT_FAILURE;
}
/* set GPIO to output */
status = mraa_gpio_dir(gpio_1, MRAA_GPIO_OUT);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* set GPIO to output */
status = mraa_gpio_dir(gpio_2, MRAA_GPIO_OUT);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* toggle both GPIO's */
while (flag) {
status = mraa_gpio_write(gpio_1, 1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
status = mraa_gpio_write(gpio_2, 0);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
sleep(1);
status = mraa_gpio_write(gpio_1, 0);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
status = mraa_gpio_write(gpio_2, 1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
sleep(1);
}
/* release gpio's */
status = mraa_gpio_close(gpio_1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* close GPIO */
status = mraa_gpio_close(gpio_2);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

94
examples/c/gpio_advanced.c Normal file
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@@ -0,0 +1,94 @@
/*
* Author: Brendan Le Foll
* Contributors: Alex Tereschenko <alext.mkrs@gmail.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Configures GPIO pin for interrupt and waits 30 seconds for the isr to trigger
*
*/
/* standard headers */
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/gpio.h"
#define GPIO_PIN 6
void
int_handler(void* args)
{
fprintf(stdout, "ISR triggered\n");
}
int
main()
{
mraa_result_t status = MRAA_SUCCESS;
mraa_gpio_context gpio;
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize GPIO pin */
gpio = mraa_gpio_init(GPIO_PIN);
if (gpio == NULL) {
fprintf(stderr, "Failed to initialize GPIO %d\n", GPIO_PIN);
mraa_deinit();
return EXIT_FAILURE;
}
/* set GPIO to input */
status = mraa_gpio_dir(gpio, MRAA_GPIO_IN);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* configure ISR for GPIO */
status = mraa_gpio_isr(gpio, MRAA_GPIO_EDGE_BOTH, &int_handler, NULL);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* wait 30 seconds isr trigger */
sleep(30);
/* close GPIO */
mraa_gpio_close(gpio);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

41
examples/c/hellomraa.c Normal file
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@@ -0,0 +1,41 @@
/*
* Author: Brendan Le Foll <brendan.le.foll@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <syslog.h>
//! [Interesting]
#include "mraa.h"
int
main(int argc, char** argv)
{
const char* board_name = mraa_get_platform_name();
fprintf(stdout, "hello mraa\n Version: %s\n Running on %s\n", mraa_get_version(), board_name);
mraa_deinit();
return MRAA_SUCCESS;
}
//! [Interesting]

224
examples/c/i2c_hmc5883l.c Normal file
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@@ -0,0 +1,224 @@
/*
* Author: Brendan Le Foll <brendan.le.foll@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Outputs X,Y,Z co-ordinates and direction recursively using
* HMC5883L. Press Ctrl+C to exit.
*
*/
/* standard headers */
#include <math.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/i2c.h"
#define MAX_BUFFER_LENGTH 6
#define HMC5883L_I2C_ADDR 0x1E
/* configuration registers */
#define HMC5883L_CONF_REG_A 0x00
#define HMC5883L_CONF_REG_B 0x01
/* mode register */
#define HMC5883L_MODE_REG 0x02
/* data register */
#define HMC5883L_X_MSB_REG 0
#define HMC5883L_X_LSB_REG 1
#define HMC5883L_Z_MSB_REG 2
#define HMC5883L_Z_LSB_REG 3
#define HMC5883L_Y_MSB_REG 4
#define HMC5883L_Y_LSB_REG 5
#define DATA_REG_SIZE 6
/* status register */
#define HMC5883L_STATUS_REG 0x09
/* ID registers */
#define HMC5883L_ID_A_REG 0x0A
#define HMC5883L_ID_B_REG 0x0B
#define HMC5883L_ID_C_REG 0x0C
#define HMC5883L_CONT_MODE 0x00
#define HMC5883L_DATA_REG 0x03
/* scales */
#define GA_0_88_REG 0x00 << 5
#define GA_1_3_REG 0x01 << 5
#define GA_1_9_REG 0x02 << 5
#define GA_2_5_REG 0x03 << 5
#define GA_4_0_REG 0x04 << 5
#define GA_4_7_REG 0x05 << 5
#define GA_5_6_REG 0x06 << 5
#define GA_8_1_REG 0x07 << 5
/* digital resolutions */
#define SCALE_0_73_MG 0.73
#define SCALE_0_92_MG 0.92
#define SCALE_1_22_MG 1.22
#define SCALE_1_52_MG 1.52
#define SCALE_2_27_MG 2.27
#define SCALE_2_56_MG 2.56
#define SCALE_3_03_MG 3.03
#define SCALE_4_35_MG 4.35
#define I2C_BUS 0
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_i2c_context i2c;
float direction = 0;
int16_t x = 0, y = 0, z = 0;
uint8_t rx_tx_buf[MAX_BUFFER_LENGTH];
/* install signal handler */
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
i2c = mraa_i2c_init(I2C_BUS);
if (i2c == NULL) {
fprintf(stderr, "Failed to initialize I2C\n");
mraa_deinit();
return EXIT_FAILURE;
}
/* set slave address */
mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* set device gain */
rx_tx_buf[0] = HMC5883L_CONF_REG_B;
rx_tx_buf[1] = GA_1_3_REG;
status = mraa_i2c_write(i2c, rx_tx_buf, 2);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
status = mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* set continuous mode */
rx_tx_buf[0] = HMC5883L_MODE_REG;
rx_tx_buf[1] = HMC5883L_CONT_MODE;
status = mraa_i2c_write(i2c, rx_tx_buf, 2);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
while (flag) {
#if 0
int i = 0;
/*
* alternative, equivalent method which helps to understand exactly what
* the below does
*/
mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
for (i = 0; i < DATA_REG_SIZE; i++) {
mraa_i2c_read_byte_data(i2c, HMC5883L_DATA_REG+i);
}
#endif
/* select data register to read */
status = mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
status = mraa_i2c_write_byte(i2c, HMC5883L_DATA_REG);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* do a incremental read from the chosen address */
status = mraa_i2c_address(i2c, HMC5883L_I2C_ADDR);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* this call behaves very similarly to the Wire receive() call */
mraa_i2c_read(i2c, rx_tx_buf, DATA_REG_SIZE);
x = (rx_tx_buf[HMC5883L_X_MSB_REG] << 8) | rx_tx_buf[HMC5883L_X_LSB_REG];
z = (rx_tx_buf[HMC5883L_Z_MSB_REG] << 8) | rx_tx_buf[HMC5883L_Z_LSB_REG];
y = (rx_tx_buf[HMC5883L_Y_MSB_REG] << 8) | rx_tx_buf[HMC5883L_Y_LSB_REG];
/* scale and calculate direction */
direction = atan2(y * SCALE_0_92_MG, x * SCALE_0_92_MG);
/* check if the signs are reversed */
if (direction < 0) {
direction += 2 * M_PI;
}
fprintf(stdout, "Compass scaled data x : %f, y : %f, z : %f\n", x * SCALE_0_92_MG,
y * SCALE_0_92_MG, z * SCALE_0_92_MG);
fprintf(stdout, "Heading : %f\n", direction * 180 / M_PI);
sleep(2);
}
/* stop i2c */
mraa_i2c_stop(i2c);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* stop i2c */
mraa_i2c_stop(i2c);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

170
examples/c/i2c_mpu6050.c Normal file
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@@ -0,0 +1,170 @@
/*
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2018, Linaro Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Outputs Accelerometer and Gyroscope value from MPU6050 recursively.
* Press Ctrl+C to exit.
*
*/
/* standard headers */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/i2c.h"
#define I2C_BUS 0
/* register definitions */
#define MPU6050_ADDR 0x68
#define MPU6050_REG_PWR_MGMT_1 0x6b
#define MPU6050_REG_RAW_ACCEL_X 0x3b
#define MPU6050_REG_RAW_ACCEL_Y 0x3d
#define MPU6050_REG_RAW_ACCEL_Z 0x3f
#define MPU6050_REG_RAW_GYRO_X 0x43
#define MPU6050_REG_RAW_GYRO_Y 0x45
#define MPU6050_REG_RAW_GYRO_Z 0x47
/* bit definitions */
#define MPU6050_RESET 0x80
#define MPU6050_SLEEP (1 << 6)
#define MPU6050_PLL_GYRO_X (1 << 1)
/* accelerometer scale factor for (+/-)2g */
#define MPU6050_ACCEL_SCALE 16384.0
/* gyroscope scale factor for (+/-)250/s */
#define MPU6050_GYRO_SCALE 131.0
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int16_t
i2c_read_word(mraa_i2c_context dev, uint8_t command)
{
return be16toh(mraa_i2c_read_word_data(dev, command));
}
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_i2c_context i2c;
uint8_t data;
int16_t accel_data[3];
int16_t gyro_data[3];
int ret;
/* install signal handler */
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize I2C bus */
i2c = mraa_i2c_init(I2C_BUS);
if (i2c == NULL) {
fprintf(stderr, "Failed to initialize I2C\n");
mraa_deinit();
return EXIT_FAILURE;
}
/* set slave address */
status = mraa_i2c_address(i2c, MPU6050_ADDR);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* reset the sensor */
status = mraa_i2c_write_byte_data(i2c, MPU6050_RESET, MPU6050_REG_PWR_MGMT_1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
sleep(5);
/* configure power management register */
ret = mraa_i2c_read_byte_data(i2c, MPU6050_REG_PWR_MGMT_1);
if (ret == -1) {
return EXIT_FAILURE;
}
data = ret;
data |= MPU6050_PLL_GYRO_X;
data &= ~(MPU6050_SLEEP);
status = mraa_i2c_write_byte_data(i2c, data, MPU6050_REG_PWR_MGMT_1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
sleep(5);
while (flag) {
/* read raw accel data */
accel_data[0] = i2c_read_word(i2c, MPU6050_REG_RAW_ACCEL_X) / MPU6050_ACCEL_SCALE;
accel_data[1] = i2c_read_word(i2c, MPU6050_REG_RAW_ACCEL_Y) / MPU6050_ACCEL_SCALE;
accel_data[2] = i2c_read_word(i2c, MPU6050_REG_RAW_ACCEL_Z) / MPU6050_ACCEL_SCALE;
/* read raw gyro data */
gyro_data[0] = i2c_read_word(i2c, MPU6050_REG_RAW_GYRO_X) / MPU6050_GYRO_SCALE;
gyro_data[1] = i2c_read_word(i2c, MPU6050_REG_RAW_GYRO_Y) / MPU6050_GYRO_SCALE;
gyro_data[2] = i2c_read_word(i2c, MPU6050_REG_RAW_GYRO_Z) / MPU6050_GYRO_SCALE;
fprintf(stdout, "accel: x:%d y:%d z:%d\n", accel_data[0], accel_data[1], accel_data[2]);
fprintf(stdout, "gyro: x:%d y:%d z:%d\n\n", gyro_data[0], gyro_data[1], gyro_data[2]);
sleep(2);
}
/* stop i2c */
mraa_i2c_stop(i2c);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* stop i2c */
mraa_i2c_stop(i2c);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

172
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/*
* Author: Brendan Le Foll
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Sets accelerometer scale, enables the x axis measurement and sets the trigger.
* Waits 100 seconds for the buffer trigger to happen.
*/
/* standard headers */
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/iio.h"
/* IIO device */
#define IIO_DEV 0
static void
printword(uint16_t input, mraa_iio_channel* chan)
{
int16_t res;
if (!chan->lendian) {
input = be16toh(input);
} else {
input = le16toh(input);
}
input >>= chan->shift;
input &= chan->mask;
if (chan->signedd) {
res = (int16_t)(input << (16 - chan->bits_used)) >> (16 - chan->bits_used);
} else {
res = input;
}
fprintf(stdout, " value = %05f\n", (float) res);
}
void
interrupt(char* data, void* args)
{
mraa_iio_context thisdevice = (mraa_iio_context) args;
mraa_iio_channel* channels = mraa_iio_get_channels(thisdevice);
int i = 0;
for (; i < mraa_iio_get_channel_count(thisdevice); i++) {
if (channels[i].enabled) {
fprintf(stdout, "channel %d - bytes %d\n", channels[i].index, channels[i].bytes);
switch (channels[i].bytes) {
case 2:
printword(*(uint16_t*) (data + channels[i].location), &channels[i]);
}
}
}
}
void
event_interrupt(struct iio_event_data* data)
{
int chan_type;
int modifier;
int type;
int direction;
int channel;
int channel2;
int different;
mraa_iio_event_extract_event(data, &chan_type, &modifier, &type, &direction, &channel, &channel2, &different);
fprintf(stdout,
"event time %lld id %lld extracted chan_type %d modifier %d type %d direction %d "
"channel %d channel2 %d different %d\n",
data->timestamp, data->id, chan_type, modifier, type, direction, channel, channel2, different);
}
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_iio_context iio;
float iio_float;
int iio_int;
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize iio */
iio = mraa_iio_init(IIO_DEV);
if (iio == NULL) {
fprintf(stderr, "Failed to initialize IIO device\n");
mraa_deinit();
return EXIT_FAILURE;
}
status = mraa_iio_write_float(iio, "in_accel_scale", 0.019163);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "Failed to write scale to IIO device\n");
goto err_exit;
}
status = mraa_iio_read_float(iio, "in_accel_scale", &iio_float);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "Failed to read scale from IIO device\n");
goto err_exit;
}
fprintf(stdout, "IIO scale: %f\n", iio_float);
status = mraa_iio_write_int(iio, "scan_elements/in_accel_x_en", 1);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "Failed to enable axis of the IIO device\n");
goto err_exit;
}
status = mraa_iio_read_int(iio, "scan_elements/in_accel_x_en", &iio_int);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "Failed to read enable status from IIO device\n");
goto err_exit;
}
fprintf(stdout, "IIO enable status: %d\n", iio_int);
status = mraa_iio_trigger_buffer(iio, interrupt, (void*) iio);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "Failed to set IIO buffer trigger\n");
goto err_exit;
}
/* wait for the trigger */
fprintf(stdout, "Waiting for the trigger...\n");
sleep(100);
/* close IIO device */
mraa_iio_close(iio);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* close IIO device */
mraa_iio_close(iio);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

108
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/*
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2018, Linaro Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Reads maximum brightness value for user led and turns it
* on/off depending on current state. Then sets led trigger
* to heartbeat.
*
*/
/* standard headers */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/led.h"
/* LED name */
#define USER_LED "user1"
/* trigger type */
#define LED_TRIGGER "heartbeat"
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_led_context led;
int val;
/* initialize mraa for the platform (not needed most of the time) */
mraa_init();
//! [Interesting]
/* initialize LED */
led = mraa_led_init(USER_LED);
if (led == NULL) {
fprintf(stderr, "Failed to initialize LED\n");
mraa_deinit();
return EXIT_FAILURE;
}
/* read maximum brightness */
val = mraa_led_read_max_brightness(led);
fprintf(stdout, "maximum brightness value for LED is: %d\n", val);
if (val >= 1) {
val = 0;
} else {
/* never reached mostly */
val = 1;
}
/* turn LED on/off depending on max_brightness value */
status = mraa_led_set_brightness(led, val);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "unable to set LED brightness\n");
goto err_exit;
}
/* sleep for 5 seconds */
sleep(5);
/* set LED trigger to heartbeat */
status = mraa_led_set_trigger(led, LED_TRIGGER);
if (status != MRAA_SUCCESS) {
fprintf(stderr, "unable to set LED trigger to: heartbeat\n");
goto err_exit;
}
fprintf(stdout, "LED trigger set to: heartbeat\n");
/* close LED */
mraa_led_close(led);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

124
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/*
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Generates PWM signal of period 200us with variable dutycyle
* repeately. Press Ctrl+C to exit
*/
/* standard headers */
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/pwm.h"
/* PWM declaration */
#define PWM 3
/* PWM period in us */
#define PWM_FREQ 200
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(void)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_pwm_context pwm;
float value = 0.0f;
float output;
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
pwm = mraa_pwm_init(PWM);
if (pwm == NULL) {
fprintf(stderr, "Failed to initialize PWM\n");
mraa_deinit();
return EXIT_FAILURE;
}
/* set PWM period */
status = mraa_pwm_period_us(pwm, PWM_FREQ);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* enable PWM */
status = mraa_pwm_enable(pwm, 1);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
while (flag) {
value = value + 0.01f;
/* write PWM duty cyle */
status = mraa_pwm_write(pwm, value);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
usleep(50000);
if (value >= 1.0f) {
value = 0.0f;
}
/* read PWM duty cyle */
output = mraa_pwm_read(pwm);
fprintf(stdout, "PWM value is %f\n", output);
}
/* close PWM */
mraa_pwm_close(pwm);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* close PWM */
mraa_pwm_close(pwm);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

154
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/*
* Author: Michael Ring <mail@michael-ring.org>
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Display set of patterns on MAX7219 repeately.
* Press Ctrl+C to exit
*/
/* standard headers */
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/spi.h"
/* SPI declaration */
#define SPI_BUS 0
/* SPI frequency in Hz */
#define SPI_FREQ 400000
uint16_t pat[] = { 0x01aa, 0x0255, 0x03aa, 0x0455, 0x05aa, 0x0655, 0x07aa, 0x0855 };
uint16_t pat_inv[] = { 0x0155, 0x02aa, 0x0355, 0x04aa, 0x0555, 0x06aa, 0x0755, 0x08aa };
uint16_t pat_clear[] = { 0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800 };
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(int argc, char** argv)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_spi_context spi;
int i, j;
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize SPI bus */
spi = mraa_spi_init(SPI_BUS);
if (spi == NULL) {
fprintf(stderr, "Failed to initialize SPI\n");
mraa_deinit();
return EXIT_FAILURE;
}
/* set SPI frequency */
status = mraa_spi_frequency(spi, SPI_FREQ);
if (status != MRAA_SUCCESS)
goto err_exit;
/* set big endian mode */
status = mraa_spi_lsbmode(spi, 0);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
/* MAX7219/21 chip needs the data in word size */
status = mraa_spi_bit_per_word(spi, 16);
if (status != MRAA_SUCCESS) {
fprintf(stdout, "Failed to set SPI Device to 16Bit mode\n");
goto err_exit;
}
/* do not decode bits */
mraa_spi_write_word(spi, 0x0900);
/* brightness of LEDs */
mraa_spi_write_word(spi, 0x0a05);
/* show all scan lines */
mraa_spi_write_word(spi, 0x0b07);
/* set display on */
mraa_spi_write_word(spi, 0x0c01);
/* testmode off */
mraa_spi_write_word(spi, 0x0f00);
while (flag) {
/* set display pattern */
mraa_spi_write_buf_word(spi, pat, 16);
sleep(2);
/* set inverted display pattern */
mraa_spi_write_buf_word(spi, pat_inv, 16);
sleep(2);
/* clear the LED's */
mraa_spi_write_buf_word(spi, pat_clear, 16);
/* cycle through all LED's */
for (i = 1; i <= 8; i++) {
for (j = 0; j < 8; j++) {
mraa_spi_write_word(spi, (i << 8) + (1 << j));
sleep(1);
}
mraa_spi_write_word(spi, i << 8);
}
}
/* stop spi */
mraa_spi_stop(spi);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* stop spi */
mraa_spi_stop(spi);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

93
examples/c/uart.c Normal file
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/*
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Author: Brendan Le Foll <brendan.le.foll@intel.com>
* Contributors: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2014, 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Prints "Hello Mraa!" recursively. Press Ctrl+C to exit
*
*/
/* standard headers */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/uart.h"
#define UART 0
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(int argc, char** argv)
{
mraa_uart_context uart;
char buffer[] = "Hello Mraa!";
/* install signal handler */
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the times) */
mraa_init();
//! [Interesting]
/* initialize UART */
uart = mraa_uart_init(UART);
if (uart == NULL) {
fprintf(stderr, "Failed to initialize UART\n");
goto err_exit;
}
while (flag) {
/* send data through UART */
mraa_uart_write(uart, buffer, sizeof(buffer));
sleep(1);
}
/* stop UART */
mraa_uart_stop(uart);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

115
examples/c/uart_advanced.c Normal file
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/*
* Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (c) 2018, Linaro Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Prints "Hello Mraa!" recursively. Press Ctrl+C to exit
*
*/
/* standard headers */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa header */
#include "mraa/uart.h"
#ifndef FALSE
#define FALSE 0
#define TRUE (!FALSE)
#endif
/* UART port name */
const char* dev_path = "/dev/ttyS0";
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
fprintf(stdout, "Exiting...\n");
flag = 0;
}
}
int
main(int argc, char** argv)
{
mraa_result_t status = MRAA_SUCCESS;
mraa_uart_context uart;
char buffer[] = "Hello Mraa!";
int baudrate = 9600, stopbits = 1, databits = 8;
mraa_uart_parity_t parity = MRAA_UART_PARITY_NONE;
unsigned int ctsrts = FALSE, xonxoff = FALSE;
const char* name = NULL;
/* install signal handler */
signal(SIGINT, sig_handler);
/* initialize mraa for the platform (not needed most of the time) */
mraa_init();
//! [Interesting]
/* initialize uart */
uart = mraa_uart_init_raw(dev_path);
if (uart == NULL) {
fprintf(stderr, "Failed to initialize UART\n");
return EXIT_FAILURE;
}
/* set serial port parameters */
status =
mraa_uart_settings(-1, &dev_path, &name, &baudrate, &databits, &stopbits, &parity, &ctsrts, &xonxoff);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
while (flag) {
/* send data through uart */
mraa_uart_write(uart, buffer, sizeof(buffer));
sleep(1);
}
/* stop uart */
mraa_uart_stop(uart);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the time) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* stop uart */
mraa_uart_stop(uart);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}

105
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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Example usage: Search and print the found OW device ID recursively.
*
*/
/* standard headers */
#include "stdio.h"
/* mraa header */
#include "mraa.h"
int
main(void)
{
mraa_uart_ow_context uart_ow;
mraa_result_t status;
uint8_t id[MRAA_UART_OW_ROMCODE_SIZE];
uint8_t count = 0;
//! [Interesting]
uart_ow = mraa_uart_ow_init(0);
if (uart_ow == NULL) {
fprintf(stderr, "Failed to initialize UART OW\n");
mraa_deinit();
return EXIT_FAILURE;
}
// Reset the ow bus and see if anything is present
status = mraa_uart_ow_reset(uart_ow);
if (status == MRAA_SUCCESS) {
fprintf(stdout, "Reset succeeded, device(s) detected!\n");
} else {
goto err_exit;
}
fprintf(stdout, "Looking for devices...\n");
/*
* we are essentially doing a binary tree search through the 64
* bit address space. id is modified during this search, and will
* be set to the valid rom code for each device found.
*
* start the search from scratch
*/
status = mraa_uart_ow_rom_search(uart_ow, 1, id);
if (status != MRAA_SUCCESS) {
goto err_exit;
}
while (status == MRAA_SUCCESS) {
/* The first byte (id[0]]) is the device type (family) code.
* The last byte (id[7]) is the rom code CRC value. The
* intervening bytes (id[1]-id[6]) are the unique 48 bit
* device ID.
*/
fprintf(stdout, "Device %02d Type 0x%02x ID %02x%02x%02x%02x%02x%02x CRC 0x%02x\n", count,
id[0], id[6], id[5], id[4], id[3], id[2], id[1], id[7]);
count++;
// continue the search with start argument set to 0
status = mraa_uart_ow_rom_search(uart_ow, 0, id);
}
/* stop uart_ow */
mraa_uart_ow_stop(uart_ow);
//! [Interesting]
/* deinitialize mraa for the platform (not needed most of the time) */
mraa_deinit();
return EXIT_SUCCESS;
err_exit:
mraa_result_print(status);
/* stop uart_ow */
mraa_uart_ow_stop(uart_ow);
/* deinitialize mraa for the platform (not needed most of the times) */
mraa_deinit();
return EXIT_FAILURE;
}