Mario Hüttel
8bbc2e60f8
* Shellmatta implemented using UART * Version string implemented * Increased heap size * Add shellmatta printf support
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/*
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* uart.c
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*
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* Created on: Dec 15, 2014
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* Author: shino-chan
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*/
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//USART2
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//PA2 => TX
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//PA3 => RX
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//Alternate Function 7
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#include <uart/uart.h>
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#include <stm32f4xx.h>
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#include <clock-enable-manager.h>
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#include <stm32-gpio-macros.h>
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#include <uart/dma-ring-buffer.h>
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static struct dma_ring_buffer ring_buff;
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static char uart_rx_buffer[64];
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void initUART() {
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__DSB();
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RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
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RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
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__DSB();
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GPIOA->MODER |= (1<<5);
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GPIOA->AFR[0] |= (7<<8); //Enable Clock
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GPIOA->MODER |= (1<<5);
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GPIOA->AFR[0] |= (7<<8);
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asm("nop");
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asm("nop");
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asm("nop");
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USART2->BRR = 0x1117; //Baudrate 273.4375=>0x1117 9600baud bei 42MHz Periph
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USART2->CR1 = USART_CR1_UE | USART_CR1_TE;
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}
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void sendChar(char c) {
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while(!(USART2->SR & USART_SR_TXE));
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USART2->DR = c;
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}
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void sendString(char* s, int count) {
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int i = 0;
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for (i = 0; i < count; i++,s++)
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{
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if (!(*s))
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break;
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sendChar(*s);
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}
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}
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static inline void uart_gpio_config()
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{
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rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(UART_PORT_RCC_MASK));
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UART_PORT->MODER &= MODER_DELETE(UART_TX_PIN) & MODER_DELETE(UART_RX_PIN);
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UART_PORT->MODER |= ALTFUNC(UART_RX_PIN) | ALTFUNC(UART_TX_PIN);
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SETAF(UART_PORT, UART_RX_PIN, UART_RX_PIN_ALTFUNC);
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SETAF(UART_PORT, UART_TX_PIN, UART_TX_PIN_ALTFUNC);
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}
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void uart_init_with_dma()
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{
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rcc_manager_enable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(UART_RCC_MASK));
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uart_gpio_config();
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UART_PERIPH->BRR = UART_BRR_REG_VALUE;
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UART_PERIPH->CR3 = USART_CR3_DMAR | USART_CR3_DMAT;
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UART_PERIPH->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
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dma_ring_buffer_initialize(&ring_buff, 2, DMA2_Stream5, sizeof(uart_rx_buffer), uart_rx_buffer, (char *)&UART_PERIPH->DR, 4);
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}
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void uart_disable()
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{
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UART_PERIPH->CR1 = 0;
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UART_PERIPH->CR2 = 0;
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UART_PERIPH->CR3 = 0;
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dma_ring_buffer_stop(&ring_buff);
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rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(UART_PORT_RCC_MASK));
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rcc_manager_disable_clock(&RCC->APB2ENR, BITMASK_TO_BITNO(UART_RCC_MASK));
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}
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void uart_send_char(char c)
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{
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while(!(UART_PERIPH->SR & USART_SR_TXE));
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UART_PERIPH->DR = c;
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}
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void uart_send_array(const char *data, uint32_t len)
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{
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uint32_t i;
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for (i = 0; i < len; i++)
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uart_send_char(data[i]);
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}
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void uart_send_string(char *string)
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{
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int i;
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for (i = 0; string[i] != '\0'; i++)
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uart_send_char(string[i]);
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}
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void uart_send_array_with_dma(char *data, uint32_t len);
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void uart_send_string_with_dma(char *string);
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int uart_receive_data_with_dma(const char **data, size_t *len)
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{
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return dma_ring_buffer_get_data(&ring_buff, data, len);
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}
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