/*
 * stm32f4_uart.c
 *
 *  Created on: Jul 24, 2016
 *      Author: tkl
 */

#include <stddef.h>
#include <stdint.h>

#include "stm32f4xx.h"
#include "stm32f4xx_isr.h"
#include "stm32f4_uart.h"
#include "gpio.h"
#include "stm32f4_gpio.h"

struct stm32f4_uart_obj {
	UART_HandleTypeDef *uart1_handle;
	UART_HandleTypeDef *uart2_handle;
	UART_HandleTypeDef *uart3_handle;
	UART_HandleTypeDef *uart6_handle;
};

static volatile struct stm32f4_uart_obj uart_obj = {
		.uart1_handle = NULL,
		.uart2_handle = NULL,
		.uart3_handle = NULL,
		.uart6_handle = NULL,
};

int stm32f4_uart_open(const void *this)
{
	if(NULL == this)
		return -1;
	struct stm32f4_uart *uart = (struct stm32f4_uart *)this;
	IRQn_Type irq_type = USART1_IRQn;

	/* init gpio */
	stm32f4_gpio_open(uart->uart_gpio);

	/* uart clock enable */
	if(uart->uart_handle->Instance == USART1) {
		__HAL_RCC_USART1_CLK_ENABLE();
		irq_type = USART1_IRQn;
		uart_obj.uart1_handle = uart->uart_handle;
	}
	else if(uart->uart_handle->Instance == USART2) {
		__HAL_RCC_USART2_CLK_ENABLE();
		irq_type = USART2_IRQn;
		uart_obj.uart2_handle = uart->uart_handle;
	}
	else if(uart->uart_handle->Instance == USART3) {
		__HAL_RCC_USART3_CLK_ENABLE();
		irq_type = USART3_IRQn;
		uart_obj.uart3_handle = uart->uart_handle;
	}
	else if(uart->uart_handle->Instance == USART6) {
		__HAL_RCC_USART6_CLK_ENABLE();
		irq_type = USART6_IRQn;
		uart_obj.uart3_handle = uart->uart_handle;
	}

	HAL_UART_Init(uart->uart_handle);
	HAL_NVIC_SetPriority(irq_type, 5, 1);
	HAL_NVIC_EnableIRQ(USART1_IRQn);

	return (0);
}

int stm32f4_uart_close(const void *this)
{
	if(NULL == this)
		return -1;
	struct stm32f4_uart *uart = (struct stm32f4_uart *)this;
	IRQn_Type irq_type = USART1_IRQn;

	HAL_UART_DeInit((UART_HandleTypeDef *)uart->uart_handle);
	if(uart->uart_handle->Instance == USART1) {
		__HAL_RCC_USART1_CLK_DISABLE();
		irq_type = USART1_IRQn;
	}
	else if(uart->uart_handle->Instance == USART2) {
		__HAL_RCC_USART2_CLK_DISABLE();
		irq_type = USART2_IRQn;
	}
	else if(uart->uart_handle->Instance == USART3) {
		__HAL_RCC_USART3_CLK_DISABLE();
		irq_type = USART3_IRQn;
	}
	else if(uart->uart_handle->Instance == USART6) {
		__HAL_RCC_USART6_CLK_DISABLE();
		irq_type = USART6_IRQn;
	}
	HAL_NVIC_DisableIRQ(irq_type);

	stm32f4_gpio_close(uart->uart_gpio);
	return (0);
}

int stm32f4_uart_read(const void *this, char *buffer, int len)
{
	return (1);
}

int stm32f4_uart_write(const void *this, const char *buffer, int len)
{
	if(NULL == this)
		return -1;
	struct stm32f4_uart *uart = (struct stm32f4_uart *)this;
	HAL_UART_Transmit_IT(uart->uart_handle, (uint8_t *)buffer, len);
	return len;
}

int stm32f4_uart_set_cb(const void *this, const void *callback, const void *param)
{
	return (0);
}

// this is the interrupt request handler (IRQ) for ALL USART1 interrupts
void USART1_IRQHandler(void)
{
	enter_isr();
	HAL_UART_IRQHandler(uart_obj.uart1_handle);
	exit_isr();
}