gpio: implement some more features.

3 files changed, 68 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 588049b..34345d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-dnl Copyright (C) 2015 Gediminas Jakutis
+dnl Copyright (C) 2015-2016 Gediminas Jakutis
 dnl
 dnl This configure.ac is free software; you can redistribute it and/or
 dnl modify it under the terms of the GNU Lesser General Public
@@ -31,7 +31,7 @@ AM_INIT_AUTOMAKE
 LT_INIT
 
 # Checks for header files.
-AC_CHECK_HEADERS([fcntl.h inttypes.h stdio.h stdint.h stdlib.h string.h sys/types.h sys/stat.h time,h unistd.h])
+AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stdio.h stdint.h stdlib.h string.h sys/types.h sys/stat.h time,h unistd.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_INT32_T
diff --git a/include/rin/gpio.h b/include/rin/gpio.h
index 83ca934..1ca2169 100644
--- a/include/rin/gpio.h
+++ b/include/rin/gpio.h
@@ -21,16 +21,32 @@
 #ifndef LIBRIN_GPIO_INCLUDED
 #define LIBRIN_GPIO_INCLUDED
 
+#include <limits.h>
+#include <time.h>
+
 enum rin_gpiotype {
 	rin_gpio_in,
 	rin_gpio_out,
 	rin_gpio_closed
 };
 
+struct rin_gpio_dataset {
+	unsigned int signalpin;
+	unsigned int clockpin;
+	struct timespec *pulseduration;
+	struct timespec *delay;
+	void *data;
+	size_t len;
+};
+
 unsigned int rin_gpio_open(const unsigned int num, const enum rin_gpiotype type);
 unsigned int rin_gpio_close(const unsigned int num);
 unsigned int rin_gpio_setval(const unsigned int num, const unsigned int val);
 unsigned int rin_gpio_readval(const unsigned int num, unsigned int * const val);
+unsigned int rin_gpio_writesequence(const struct rin_gpio_dataset * const dataset);
+unsigned int rin_gpio_on(const unsigned int num);
+unsigned int rin_gpio_off(const unsigned int num);
+unsigned int rin_gpio_pulse(const unsigned int num, const struct timespec * const pulselen);
 unsigned int rin_gpio_pin_exists(const unsigned int pin);
 unsigned int rin_gpio_get_pincount(void);
 
diff --git a/src/gpio/gpio.c b/src/gpio/gpio.c
index 45639a3..4c48919 100644
--- a/src/gpio/gpio.c
+++ b/src/gpio/gpio.c
@@ -118,6 +118,56 @@ unsigned int rin_gpio_readval(const unsigned int num, unsigned int * const val)
 	return 0;
 }
 
+
+unsigned int rin_gpio_writesequence(const struct rin_gpio_dataset * const dataset)
+{
+	unsigned char *data;
+	size_t i;
+
+	if (!dataset || !dataset->data) {
+		return 1;
+	}
+	data = dataset->data;
+	for (i = 0; i < dataset->len; ++i) {
+		unsigned char a;
+		unsigned char bit;
+
+		a = data[i / CHAR_BIT];
+		bit = !(!(a & (1 << (i % CHAR_BIT))));
+		rin_gpio_setval(dataset->signalpin, bit);
+		rin_gpio_pulse(dataset->clockpin, dataset->pulseduration);
+		if (dataset->delay) {
+			nanosleep(dataset->delay, NULL);
+		}
+	}
+	return 0;
+}
+
+unsigned int rin_gpio_on(const unsigned int num)
+{
+	return rin_gpio_setval(1, num);
+}
+
+unsigned int rin_gpio_off(const unsigned int num)
+{
+	return rin_gpio_setval(0, num);
+}
+
+unsigned int rin_gpio_pulse(const unsigned int num, const struct timespec * const pulselen)
+{
+	unsigned int ret;
+
+	ret = rin_gpio_on(num);
+	if (ret) {
+		return ret;
+	}
+	if (pulselen) {
+		nanosleep(pulselen, NULL);
+	}
+	ret = rin_gpio_off(num);
+	return ret;
+}
+
 /*
  * right now is rpi V1 specific, should be rewritten when/if we support
  * other platforms.