reflow-oven-control-sw/stm-firmware/uart/uart.c

/*
 * uart.c
 *
 *  Created on: Dec 15, 2014
 *      Author: shino-chan
 */
//USART2
//PA2 => TX
//PA3 => RX
//Alternate Function 7
#include <uart/uart.h>
#include <stm32f4xx.h>
#include <clock-enable-manager.h>
#include <stm32-gpio-macros.h>
#include <uart/dma-ring-buffer.h>

static struct dma_ring_buffer ring_buff;
static char uart_rx_buffer[64];

void initUART() {
	__DSB();
	RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
	RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
	__DSB();

	GPIOA->MODER |= (1<<5);
	GPIOA->AFR[0] |= (7<<8); //Enable Clock
	GPIOA->MODER |= (1<<5);
	GPIOA->AFR[0] |= (7<<8);
	asm("nop");
	asm("nop");
	asm("nop");
	USART2->BRR = 0x1117; //Baudrate  273.4375=>0x1117 9600baud bei 42MHz Periph
	USART2->CR1 = USART_CR1_UE | USART_CR1_TE;

}

void sendChar(char c) {
	while(!(USART2->SR & USART_SR_TXE));
	USART2->DR = c;

}
void sendString(char* s, int count) {
	int i = 0;
	for (i = 0; i < count; i++,s++)
	{
		if (!(*s))
			break;
		sendChar(*s);
	}
}

static inline void uart_gpio_config()
{
	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(UART_PORT_RCC_MASK));
	UART_PORT->MODER &=  MODER_DELETE(UART_TX_PIN) & MODER_DELETE(UART_RX_PIN);
	UART_PORT->MODER |= ALTFUNC(UART_RX_PIN) | ALTFUNC(UART_TX_PIN);
	SETAF(UART_PORT, UART_RX_PIN, UART_RX_PIN_ALTFUNC);
	SETAF(UART_PORT, UART_TX_PIN, UART_TX_PIN_ALTFUNC);
}

void uart_init_with_dma()
{
	rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(UART_RCC_MASK));
	uart_gpio_config();

	UART_PERIPH->BRR = UART_BRR_REG_VALUE;
	UART_PERIPH->CR3 = USART_CR3_DMAR | USART_CR3_DMAT;
	UART_PERIPH->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;

	dma_ring_buffer_initialize(&ring_buff, 2, DMA2_Stream5, sizeof(uart_rx_buffer), uart_rx_buffer, (char *)&UART_PERIPH->DR, 4);
}

void uart_disable()
{
	UART_PERIPH->CR1 = 0;
	UART_PERIPH->CR2 = 0;
	UART_PERIPH->CR3 = 0;
	dma_ring_buffer_stop(&ring_buff);

	rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(UART_PORT_RCC_MASK));
	rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(UART_RCC_MASK));
}

void uart_send_char(char c)
{
	while(!(UART_PERIPH->SR & USART_SR_TXE));
	UART_PERIPH->DR = c;
}

void uart_send_array(const char *data, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++)
		uart_send_char(data[i]);
}

void uart_send_string(char *string)
{
	int i;

	for (i = 0; string[i] != '\0'; i++)
		uart_send_char(string[i]);
}

void uart_send_array_with_dma(char *data, uint32_t len);

void uart_send_string_with_dma(char *string);

int uart_receive_data_with_dma(const char **data, size_t *len)
{
	return dma_ring_buffer_get_data(&ring_buff, data, len);
}