112 lines
2.9 KiB
C
112 lines
2.9 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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#include <string.h>
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static struct dma_ring_buffer_to_mem ring_buff_rx;
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static struct dma_ring_buffer_to_periph ring_buff_tx;
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static char uart_rx_buffer[64];
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static char uart_tx_buffer[256];
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#ifdef DEBUGBUILD
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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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#endif
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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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#ifdef DEBUGBUILD
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uart_gpio_config();
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#endif
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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_periph_to_mem_initialize(&ring_buff_rx, 2, UART_RECEIVE_DMA_STREAM, sizeof(uart_rx_buffer), 1U,
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uart_rx_buffer, (char *)&UART_PERIPH->DR, 4);
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dma_ring_buffer_mem_to_periph_initialize(&ring_buff_tx, 2, UART_SEND_DMA_STREAM, sizeof(uart_tx_buffer), 1U,
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uart_tx_buffer, 4U, (void *)&UART_PERIPH->DR);
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NVIC_EnableIRQ(DMA2_Stream7_IRQn);
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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_periph_to_mem_stop(&ring_buff_rx);
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dma_ring_buffer_mem_to_periph_stop(&ring_buff_tx);
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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(const 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(const char *data, uint32_t len)
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{
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dma_ring_buffer_mem_to_periph_insert_data(&ring_buff_tx, data, len);
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}
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void uart_send_string_with_dma(const char *string)
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{
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size_t len;
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len = strlen(string);
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uart_send_array_with_dma(string, (uint32_t)len);
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}
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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_periph_to_mem_get_data(&ring_buff_rx, (const void **)data, len);
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}
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void DMA2_Stream7_IRQHandler()
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{
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uint32_t hisr = DMA2->HISR;
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DMA2->HIFCR = hisr;
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if (hisr & DMA_HISR_TCIF7) {
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dma_ring_buffer_mem_to_periph_int_callback(&ring_buff_tx);
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}
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}
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