#include "bsp_uart1.h"
#include <stdio.h>

void bsp_uart1_init(uint32_t baudrate)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1_TX=PA9
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1_TX=PA10
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = baudrate;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
    USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); //使能UART1的DMA发送

    DMA_InitTypeDef DMA_InitStructure;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DATAR;    //USART1数据寄存器地址
    DMA_InitStructure.DMA_MemoryBaseAddr = 0;                               //数据缓冲区地址
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;                      //外设->内存方向
    DMA_InitStructure.DMA_BufferSize = 0;                                   //缓冲区大小
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        //外设地址不自增
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                 //内存地址自增
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据大小：字节
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;         //内存数据大小：字节
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                           //普通模式
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;                   //中优先级
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                            //非内存到内存传输
    DMA_Init(DMA1_Channel4, &DMA_InitStructure);
}

void bsp_uart1_send(uint8_t *buffer, uint16_t size)
{
    static uint8_t skip_first_wait = 1;

    while (DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET) { //等待传输完成
        if (skip_first_wait != 0) {
            skip_first_wait = 0;
            break;
        }
    }

    DMA_ClearFlag(DMA1_FLAG_TC4); //清除传输完成标志
    DMA_Cmd(DMA1_Channel4, DISABLE); //禁用DMA通道4

    DMA1_Channel4->MADDR = (uint32_t)buffer; //设置DMA传输的内存地址
    DMA1_Channel4->CNTR = size; //设置DMA传输数据长度

    DMA_Cmd(DMA1_Channel4, ENABLE); //使能DMA通道4，开始发送
}