//! \file stm32f4_gpio.c
//! \author tkl
//! \date Mai 8, 2012
//! \brief Source file of the stm32f4 architecture dependent gpio driver.
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>

#include "stm32f4xx.h"

#include "gpio.h"
#include "stm32f4_gpio.h"

//! \brief Contains data for a callback for an external interrupt.
typedef struct {
	gpio_ext_it_cb_t callback;	//!< The call back to be executed.
	void *param;				//!< Parameter for the callback
}exti_cb_list_t;

#if 0
//! \brief Contains call back data for all 16 exti lines.
static struct {
	exti_cb_list_t callback_list[16];	//!< Call back data list for the exti lines.
}gpio_obj;

static uint8_t gpio_bin2dec(uint16_t bin)
{
	uint8_t ret = 0;
	switch(bin) {
		case 0x0001: ret = 0;	break;
		case 0x0002: ret = 1;	break;
		case 0x0004: ret = 2;	break;
		case 0x0008: ret = 3;	break;
		case 0x0010: ret = 4;	break;
		case 0x0020: ret = 5;	break;
		case 0x0040: ret = 6;	break;
		case 0x0080: ret = 7;	break;
		case 0x0100: ret = 8;	break;
		case 0x0200: ret = 9;	break;
		case 0x0400: ret = 10;	break;
		case 0x0800: ret = 11;	break;
		case 0x1000: ret = 12;	break;
		case 0x2000: ret = 13;	break;
		case 0x4000: ret = 14;	break;
		case 0x8000: ret = 15;	break;
	}
	return ret;
}
#endif
int stm32f4_gpio_open(const void *gpio)
{
	struct stm32f4_gpio *this;

	if(gpio == NULL)
		return -1;

	this = (struct stm32f4_gpio *)gpio;
	if(this->port == GPIOA)
		__HAL_RCC_GPIOA_CLK_ENABLE();
	else if(this->port == GPIOB)
		__HAL_RCC_GPIOB_CLK_ENABLE();
	else if(this->port == GPIOC)
		__HAL_RCC_GPIOC_CLK_ENABLE();
	else if(this->port == GPIOD)
		__HAL_RCC_GPIOD_CLK_ENABLE();
	else if(this->port == GPIOE)
		__HAL_RCC_GPIOE_CLK_ENABLE();
	else if(this->port == GPIOF)
		__HAL_RCC_GPIOF_CLK_ENABLE();
	else if(this->port == GPIOG)
		__HAL_RCC_GPIOG_CLK_ENABLE();
	else if(this->port == GPIOH)
		__HAL_RCC_GPIOH_CLK_ENABLE();
	else if(this->port == GPIOI)
		__HAL_RCC_GPIOI_CLK_ENABLE();
	HAL_GPIO_Init(this->port, (GPIO_InitTypeDef*)this->pin);
	return 0;
}

int stm32f4_gpio_close(const void *gpio)
{
	if(gpio == NULL)
		return -1;
	struct stm32f4_gpio *this = (struct stm32f4_gpio *)gpio;
	HAL_GPIO_DeInit(this->port, this->pin->Pin);
	return 0;
}

char stm32f4_gpio_read(const void *gpio)
{
	struct stm32f4_gpio *this;
	if(gpio == NULL)
		return 0;

	this = (struct stm32f4_gpio *)gpio;
	return HAL_GPIO_ReadPin(this->port, this->pin->Pin);
}

void stm32f4_gpio_write(const void *gpio, char byte) {
	struct stm32f4_gpio *this;
	if(gpio == NULL)
		return;

	this = (struct stm32f4_gpio *)gpio;
	HAL_GPIO_WritePin(this->port, this->pin->Pin, (GPIO_PinState)(byte & 0x01));
}

void stm32f4_gpio_toggle(const void *gpio)
{
	struct stm32f4_gpio *this;
	if(gpio == NULL)
		return;

	this = (struct stm32f4_gpio *)gpio;
	HAL_GPIO_TogglePin(this->port, this->pin->Pin);
}

int stm32f4_gpio_set_exti_callback(const void *gpio,
		const void *callback, const void *param)
{
#if 0
	struct stm32f4_gpio *this;
	uint8_t pin;
	if((gpio == NULL) || (callback == NULL))
		return -1;

	this = (struct stm32f4_gpio *)gpio;
	pin = gpio_bin2dec(this->exti->EXTI_Line);

	gpio_obj.callback_list[pin].callback = (gpio_ext_it_cb_t)callback;
	gpio_obj.callback_list[pin].param = (void*)param;
#endif
	return 0;
}

#if 0
//! \brief The ISR for the EXTI0_IRQn interrupt.
void EXTI0_IRQHandler(void)
{
	if(gpio_obj.callback_list[0].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[0].callback;
		void *param = gpio_obj.callback_list[0].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(EXTI_Line0);
}

//! \brief The ISR for the EXTI1_IRQn interrupt.
void EXTI1_IRQHandler(void)
{
	if(gpio_obj.callback_list[1].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[1].callback;
		void *param = gpio_obj.callback_list[1].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(EXTI_Line1);
}

//! \brief The ISR for the EXTI2_IRQn interrupt.
void EXTI2_IRQHandler(void)
{
	if(gpio_obj.callback_list[2].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[2].callback;
		void *param = gpio_obj.callback_list[2].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(EXTI_Line2);
}

//! \brief The ISR for the EXTI3_IRQn interrupt.
void EXTI3_IRQHandler(void)
{
	if(gpio_obj.callback_list[3].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[3].callback;
		void *param = gpio_obj.callback_list[3].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(EXTI_Line3);
}

//! \brief The ISR for the EXTI4_IRQn interrupt.
void EXTI4_IRQHandler(void)
{
	if(gpio_obj.callback_list[4].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[4].callback;
		void *param = gpio_obj.callback_list[4].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(EXTI_Line4);
}

//! \brief The ISR for the EXTI9_5_IRQn interrupt.
void EXTI9_5_IRQHandler(void) {
	uint32_t exti = 0;
	uint8_t pin;
	if(EXTI_GetITStatus(EXTI_Line6))
		exti = EXTI_Line6;

	pin = gpio_bin2dec(exti);
	if(gpio_obj.callback_list[pin].callback != NULL) {
		gpio_ext_it_cb_t cb = gpio_obj.callback_list[pin].callback;
		void *param = gpio_obj.callback_list[pin].param;
		cb(param);
	}
	EXTI_ClearITPendingBit(exti);
}

//! \brief The ISR for the EXTI15_10_IRQn interrupt.
void EXTI15_10_IRQHandler(void) {
	// TODO: detect & clear pending bit
}
#endif