66 lines
3.0 KiB
C
66 lines
3.0 KiB
C
#include "bsp_uart1.h"
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#include <stdio.h>
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void bsp_uart1_init(uint32_t baudrate)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1_TX=PA9
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1_TX=PA10
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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USART_InitStructure.USART_BaudRate = baudrate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
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USART_Init(USART1, &USART_InitStructure);
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USART_Cmd(USART1, ENABLE);
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USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); //使能UART1的DMA发送
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DMA_InitTypeDef DMA_InitStructure;
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DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DATAR; //USART1数据寄存器地址
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DMA_InitStructure.DMA_MemoryBaseAddr = 0; //数据缓冲区地址
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设->内存方向
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DMA_InitStructure.DMA_BufferSize = 0; //缓冲区大小
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址不自增
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址自增
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据大小：字节
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //内存数据大小：字节
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DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //普通模式
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DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中优先级
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DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非内存到内存传输
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DMA_Init(DMA1_Channel4, &DMA_InitStructure);
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}
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void bsp_uart1_send(uint8_t *buffer, uint16_t size)
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{
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static uint8_t skip_first_wait = 1;
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while (DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET) { //等待传输完成
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if (skip_first_wait != 0) {
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skip_first_wait = 0;
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break;
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}
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}
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DMA_ClearFlag(DMA1_FLAG_TC4); //清除传输完成标志
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DMA_Cmd(DMA1_Channel4, DISABLE); //禁用DMA通道4
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DMA1_Channel4->MADDR = (uint32_t)buffer; //设置DMA传输的内存地址
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DMA1_Channel4->CNTR = size; //设置DMA传输数据长度
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DMA_Cmd(DMA1_Channel4, ENABLE); //使能DMA通道4，开始发送
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}
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