add gpio-utils

lib/gpio-util.c

@@ -0,0 +1,63 @@
+
+#include <mc1322x.h>
+#include <board.h>
+
+#include "gpio-util.h"
+
+void gpio_select_function(uint8_t gpio, uint8_t func) {
+	uint32_t mask = 3;
+	uint8_t major, minor, shift;
+	volatile uint32_t *base = GPIO_FUNC_SEL0;
+	uint32_t value;
+	major = gpio >> 4;
+	minor = gpio & 0xF;
+	shift = 2 * minor;
+
+	value = base[major];
+	value &= ~(mask << shift);
+	value |= (func << shift);
+	base[major] = value;
+}
+
+void gpio_reg_set(volatile uint32_t* reg, uint8_t bit) {
+	uint8_t major, minor;
+	major = bit / 32;
+	minor = bit % 32;
+	*(reg + major) |= (1UL << minor);
+}
+
+void gpio_reg_clear(volatile uint32_t* reg, uint8_t bit) {
+	uint8_t major, minor;
+	major = bit / 32;
+	minor = bit % 32;
+	*(reg + major) &= ~(1UL << minor);
+}
+
+void gpio_set_pad_dir(uint8_t gpio, uint8_t dir) {
+	uint8_t major, minor;
+	major = gpio / 32;
+	minor = gpio % 32;
+	if (dir) gpio_reg_set(GPIO_PAD_DIR0 + major, minor);
+	else     gpio_reg_clear(GPIO_PAD_DIR0 + major, minor);
+}
+
+void gpio_set(uint8_t gpio) {
+	uint8_t major, minor;
+	major = gpio / 32;
+	minor = gpio % 32;
+	*(GPIO_DATA_SET0 + major) = (1UL << minor);
+}
+
+void gpio_reset(uint8_t gpio) {
+	uint8_t major, minor;
+	major = gpio / 32;
+	minor = gpio % 32;
+	*(GPIO_DATA_RESET0 + major) = (1UL << minor);
+}
+
+bool gpio_read(uint8_t gpio) {
+	uint8_t major, minor;
+	major = gpio / 32;
+	minor = gpio % 32;
+	return (*(GPIO_DATA0 + major) >> minor) & 1;
+}

lib/include/gpio-util.h

@@ -0,0 +1,28 @@
+
+#ifndef GPIO_UTIL_H
+#define GPIO_UTIL_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+void gpio_select_function(uint8_t gpio, uint8_t func);
+void gpio_reg_set(volatile uint32_t* reg, uint8_t bit);
+void gpio_reg_clear(volatile uint32_t* reg, uint8_t bit);
+
+#define PAD_DIR_INPUT 0
+#define PAD_DIR_OUTPUT 1
+void gpio_set_pad_dir(uint8_t gpio, uint8_t dir);
+
+#undef gpio_set
+#undef gpio_reset
+#undef gpio_read
+
+//#define gpio_set gpio_set_ian
+//#define gpio_reset gpio_reset_ian
+//#define gpio_read gpio_read_ian
+
+void gpio_set(uint8_t gpio);
+void gpio_reset(uint8_t gpio);
+bool gpio_read(uint8_t gpio);
+
+#endif