gpio: rework of gpio - using open() for value_fp

* fixes maa_gpio_read by using simple posix file io
* fixes blink sample to have much more error checking
* blink sample now takes an argument

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/CMakeLists.txt

@@ -1,15 +1,17 @@
 add_executable (i2c_HMC5883L i2c_HMC5883L.c)
 add_executable (hellomaa hellomaa.c)
 add_executable (cycle-pwm3 cycle-pwm3.c)
-add_executable (blink-io8 blink-io8.c)
+add_executable (blink-io blink-io.c)
 add_executable (analogin_a0 analogin_a0.c)
 add_executable (isr_pin6 isr_pin6.c)
+add_executable (gpio_read6 gpio_read6.c)
 
 include_directories(${PROJECT_SOURCE_DIR}/api ${PROJECT_SOURCE_DIR}/include)
 
 target_link_libraries (hellomaa maa ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (i2c_HMC5883L maa m ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (cycle-pwm3 maa ${CMAKE_THREAD_LIBS_INIT})
-target_link_libraries (blink-io8 maa ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries (blink-io maa ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (analogin_a0 maa ${CMAKE_THREAD_LIBS_INIT})
 target_link_libraries (isr_pin6 maa ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries (gpio_read6 maa ${CMAKE_THREAD_LIBS_INIT})

examples/blink-io.c

@@ -0,0 +1,100 @@
+/*
+ * 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 <unistd.h>
+#include <errno.h>
+#include <signal.h>
+
+#include "gpio.h"
+
+#define DEFAULT_IOPIN 8
+
+int running = 0;
+static int iopin;
+
+void
+sig_handler(int signo)
+{
+    if (signo == SIGINT) {
+        printf("closing IO%d nicely\n", iopin);
+        running = -1;
+    }
+}
+
+int
+main(int argc, char **argv)
+{
+    maa_result_t r = MAA_SUCCESS;
+    iopin = DEFAULT_IOPIN;
+
+    if (argc < 2) {
+        printf("Provide an int arg if you want to flash on something other than %d\n", DEFAULT_IOPIN);
+    } else {
+        iopin = strtol(argv[1], NULL, 10);
+    }
+
+    maa_init();
+    fprintf(stdout, "MAA Version: %s\nStarting Blinking on IO%d\n",
+            maa_get_version(), iopin);
+
+    maa_gpio_context* gpio;
+    gpio = maa_gpio_init(iopin);
+    printf("Initialised pin%d which is atually pin%d\n", iopin, gpio->pin);
+
+    // set direction to OUT
+    r = maa_gpio_dir(gpio, MAA_GPIO_OUT);
+    if (r != MAA_SUCCESS) {
+        maa_result_print(r);
+    }
+
+    signal(SIGINT, sig_handler);
+
+    while (running == 0) {
+        r = maa_gpio_write(gpio, 0);
+        if (r != MAA_SUCCESS) {
+            maa_result_print(r);
+        } else {
+            printf("off\n");
+        }
+
+        sleep(1);
+
+        r = maa_gpio_write(gpio, 1);
+        if (r != MAA_SUCCESS) {
+            maa_result_print(r);
+        } else {
+            printf("on\n");
+        }
+
+        sleep(1);
+    }
+
+    r = maa_gpio_close(gpio);
+    if (r != MAA_SUCCESS) {
+        maa_result_print(r);
+    }
+
+    return r;
+}

examples/gpio_read6.c

@@ -31,17 +31,21 @@ int
 main(int argc, char **argv)
 {
     maa_init();
-    fprintf(stdout, "MAA Version: %s\nStarting Blinking on IO8\n",
+    fprintf(stdout, "MAA Version: %s\nStarting Read on IO6\n",
             maa_get_version());
-    maa_gpio_context* gpio;
-    gpio = maa_gpio_init(8);
-    maa_gpio_dir(gpio, MAA_GPIO_OUT);
 
-    while (1) {
-        maa_gpio_write(gpio, 0);
-        sleep(1);
-        maa_gpio_write(gpio, 1);
+    maa_gpio_context* gpio;
+
+    gpio = maa_gpio_init(6);
+
+    maa_gpio_dir(gpio, MAA_GPIO_IN);
+
+    for (;;) {
+        fprintf(stdout, "Gpio is %d\n", maa_gpio_read(gpio));
         sleep(1);
     }
+
+    maa_gpio_close(gpio);
+
     return 0;
 }