gpio.c: Added gpio list/set/get utility

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

examples/CMakeLists.txt

@@ -9,6 +9,7 @@ add_executable (spi_mcp4261 spi_mcp4261.c)
 add_executable (mmap-io2 mmap-io2.c)
 add_executable (blink_onboard blink_onboard.c)
 add_executable (uart_setup uart_setup.c)
+add_executable (gpio gpio.c)
 
 include_directories(${PROJECT_SOURCE_DIR}/api)
 
@@ -23,6 +24,7 @@ target_link_libraries (spi_mcp4261 mraa)
 target_link_libraries (mmap-io2 mraa)
 target_link_libraries (blink_onboard mraa)
 target_link_libraries (uart_setup mraa)
+target_link_libraries (gpio mraa)
 
 add_subdirectory (c++)
 

examples/gpio.c

@@ -0,0 +1,160 @@
+/*
+ * 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 <unistd.h>
+
+#include "mraa/gpio.h"
+
+extern mraa_board_t* plat;
+
+char board_name[] = "Some weird devboard that isn't recognised...";
+
+void
+print_version() {
+    fprintf(stdout, "Version %s on %s\n", mraa_get_version(), board_name);
+}
+
+void
+print_help() {
+    fprintf(stdout, "list              List pins\n");
+    fprintf(stdout, "set pin level     Set pin to level (0/1)\n");
+    fprintf(stdout, "get pin           Get pin level\n");
+}
+
+void
+print_command_error() {
+    fprintf(stdout, "Invalid command, options are:\n");
+    fprintf(stdout, "list              List pins\n");
+    fprintf(stdout, "set pin level     Set pin to level (0/1)\n");
+    fprintf(stdout, "get pin           Get pin level\n");
+}
+
+void
+list_pins() {
+    const mraa_board_t* platformInfo = plat;
+    int i;
+    for (i = 0; i < platformInfo->phy_pin_count; ++i) {
+        const char *mraa_name = platformInfo->pins[i].name;
+        if (strcmp(mraa_name, "INVALID") != 0) {
+            char name[9];
+            strncpy(name, mraa_name, 8);
+            if (name[7] != '\0');
+                name[8] = '\0';
+            mraa_pincapabilities_t caps = platformInfo->pins[i].capabilites;
+            fprintf(stdout, "%02d %-8s  ", i, name);
+            if (caps.gpio)
+                fprintf(stdout, "GPIO");
+            if (caps.i2c)
+                fprintf(stdout, "I2C");
+            if (caps.spi)
+                fprintf(stdout, "SPI");
+            if (caps.pwm)
+                fprintf(stdout, "PWM");
+            if (caps.uart)
+                fprintf(stdout, "UART");
+            fprintf(stdout, "\n");
+        }
+    }
+}
+
+mraa_result_t
+gpio_set(int pin, int level) {
+    mraa_gpio_context gpio = mraa_gpio_init(pin);
+    if (gpio != NULL) {
+        mraa_gpio_dir(gpio, MRAA_GPIO_OUT);
+        mraa_gpio_write(gpio, level);
+        return MRAA_SUCCESS;
+    } else
+        return MRAA_ERROR_INVALID_RESOURCE;
+}
+
+mraa_result_t
+gpio_get(int pin, int* level) {
+    mraa_gpio_context gpio = mraa_gpio_init(pin);
+    if (gpio != NULL) {
+        mraa_gpio_dir(gpio, MRAA_GPIO_IN);
+        *level = mraa_gpio_read(gpio);
+        return MRAA_SUCCESS;
+    } else
+        return MRAA_ERROR_INVALID_RESOURCE;
+}
+
+int
+main(int argc, char **argv)
+{
+    mraa_platform_t platform = mraa_get_platform_type();
+
+    switch (platform) {
+        case MRAA_INTEL_GALILEO_GEN1:
+            strcpy(board_name, "Intel Galileo Gen1");
+            break;
+        case MRAA_INTEL_GALILEO_GEN2:
+            strcpy(board_name, "Intel Galileo Gen2");
+            break;
+        case MRAA_INTEL_EDISON_FAB_C:
+            strcpy(board_name, "Intel Edison");
+            break;
+        case MRAA_INTEL_MINNOWBOARD_MAX:
+            strcpy(board_name, "Intel Minnowboard Max");
+            break;
+        default:
+            fprintf(stdout, "Unknown platform code %d\n", platform);
+            return 1;
+    }
+
+
+    if (argc == 1) {
+        print_command_error();
+    }
+
+    if (argc > 1) {
+        if (strcmp(argv[1], "list") == 0) {
+            list_pins();
+        } else if (strcmp(argv[1], "help") == 0) {
+            print_help();
+        } else if (strcmp(argv[1], "set") == 0) {
+            if (argc == 4) {
+                int pin = atoi(argv[2]);
+                if (gpio_set(pin, atoi(argv[3])) != MRAA_SUCCESS)
+                    fprintf(stdout, "Could not initialize gpio %d\n", pin);
+            } else
+                print_command_error();
+        } else if (strcmp(argv[1], "get") == 0) {
+            if (argc == 3) {
+                int pin = atoi(argv[2]);
+                int level;
+                if (gpio_get(pin, &level) == MRAA_SUCCESS)
+                    fprintf(stdout, "Pin %d = %d\n", pin, level);
+                else
+                    fprintf(stdout, "Could not initialize gpio %d\n", pin);
+            } else
+                print_command_error();
+        } else {
+            print_command_error();
+        }
+    }
+    return 0;
+}