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spi: added example for use with mcp4261

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Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-05-16 11:51:21 +01:00
committed by Brendan Le Foll
parent 9186b79967
commit 41f619048d
2 changed files with 59 additions and 0 deletions
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2
examples/CMakeLists.txt
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@@ -5,6 +5,7 @@ add_executable (blink-io blink-io.c)
add_executable (analogin_a0 analogin_a0.c) add_executable (analogin_a0 analogin_a0.c)
add_executable (isr_pin6 isr_pin6.c) add_executable (isr_pin6 isr_pin6.c)
add_executable (gpio_read6 gpio_read6.c) add_executable (gpio_read6 gpio_read6.c)
add_executable (spi_mcp4261 spi_mcp4261.c)
include_directories(${PROJECT_SOURCE_DIR}/api) include_directories(${PROJECT_SOURCE_DIR}/api)
@@ -15,5 +16,6 @@ target_link_libraries (blink-io maa)
target_link_libraries (analogin_a0 maa) target_link_libraries (analogin_a0 maa)
target_link_libraries (isr_pin6 maa) target_link_libraries (isr_pin6 maa)
target_link_libraries (gpio_read6 maa) target_link_libraries (gpio_read6 maa)
target_link_libraries (spi_mcp4261 maa)
add_subdirectory (c++) add_subdirectory (c++)

57
examples/spi_mcp4261.c Normal file
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@@ -0,0 +1,57 @@
/*
* Author: Thomas Ingleby <thomas.c.ingleby@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 "spi.h"
#include <unistd.h>
#include <stdint.h>
int
main(int argc, char **argv)
{
maa_init();
maa_spi_context *spi;
spi = maa_spi_init(0);
unsigned int response = 0;
printf("Hello, SPI initialised: fd=%i\n",spi->spifd);
uint8_t data[] = {0x00, 100};
uint8_t *recv;
while(1) {
int i;
for (i = 90; i < 130; i++) {
data[1] = i;
recv = maa_spi_write_buf(spi, data, 2);
printf("Writing -%i",i);
printf("RECIVED-%i-%i\n",recv[0],recv[1]);
usleep(100000);
}
for (i = 130; i > 90; i--) {
data[1] = i;
recv = maa_spi_write_buf(spi, data, 2);
printf("Writing -%i",i);
printf("RECIVED-%i-%i\n",recv[0],recv[1]);
usleep(100000);
}
}
}