libgpio, better initrd structure

1 files changed, 57 insertions, 0 deletions

diff --git a/src/libgpio/gpio.h b/src/libgpio/gpio.h
new file mode 100644
index 0000000..7d7c8f7
--- /dev/null
+++ b/src/libgpio/gpio.h
@@ -0,0 +1,57 @@
+#ifndef STMOS_GPIO_H_ 
+#define STMOS_GPIO_H_
+
+#define GP(a) ((a - 'A') << 4)
+
+/**
+ * Defines possible modes for a gpio pin.
+ */
+enum GPIO_MODE
+{
+	INPUT = 0, /**< digital input */
+	OUTPUT,    /**< digital output */
+	ALTERNATE, /**< alternate function */
+	ANALOG     /**< analog function */
+};
+
+/**
+ * Defines whether to use push-pull or open drain.
+ */
+enum GPIO_TYPE
+{
+	PUSHPULL = 0, /**< push-pull */
+	OPENDRAIN     /**< open drain */
+};
+
+/**
+ * Defines the pin's speed
+ */
+enum GPIO_SPEED
+{
+	LOW = 0, /**< low */
+	MEDIUM,  /**< medium */
+	HIGH,    /**< high */
+	VERYHIGH /**< very high/maximum */
+};
+
+/**
+ * Defines if a pullup or pulldown should be used.
+ */
+enum GPIO_PUPD
+{
+	NOPUPD,  /**< no pullup/pulldown */
+	PULLUP,  /**< use pullup */
+	PULLDOWN /**< use pulldown */
+};
+
+
+typedef unsigned int gpio_pin_t;
+
+void gpioMode(gpio_pin_t pin, int mode);
+void gpioType(gpio_pin_t pin, int type);
+void gpioPuPd(gpio_pin_t pin, int pupd);
+void gpioSpeed(gpio_pin_t pin, int speed);
+void gpioWrite(gpio_pin_t pin, int value);
+int gpioRead(gpio_pin_t pin);
+
+#endif // STMOS_GPIO_H_