STM32F103系列的UART(不是USART)使用DMA的问题.及测试代码,发不出数据,请各位指点一下谢谢

lj250668420 · 发表于 2014-1-16 17:17:49

之前发过一次帖子,估计沉了,问题没有解决我就冒死再发一次,浪费网站资源请版主谅解.

原子哥给我说可能就是默认开启的
我做了一些测试代码发现使用dma发不出数据,简单的串口发送没有问题
这个代码串口1的dma发送和普通发送没有问题
但是UART4的dma发送就发不出来数据,但是普通发送没有问题
附件里是KIEL文件
原代码如下
uchar SendBuff[BufferSize ]; /* 定义外设数据，注意此处数据定义在FLASH中 */
#define BufferSize  5000
#define UART4_DR_Base 0x40004C04
#define USART1_DR_Base 0x40013804

int main(void)
{
uint i=0;
SysInit_Configuration(); //系统初始化函数
LED0=0;
while(1)
{
for(i=0;i<BufferSize;i++)
{
SendBuff = 0xf1;
}
DMA_Cmd(DMA2_Channel3, ENABLE);
// USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
while(1);
// Usart_TransData(1,0xf1);
// Usart_TransData(4,0xf4);
// printf("\r\n this is a USART Interrupt demo \r\n");
}

}
void SysInit_Configuration(void)
{
RCC_Configuration();      //利用外部高速时钟HSE对系统相关时钟进行配置，
GPIO_Configuration();     //IO口进行基本配置
// USART1_Configuration();   //串口1配置
UART4_Configuration();   //串口4配置
}
void RCC_Configuration(void)
{
ErrorStatus     HSEStartUpStatus; //定义枚举类型变量HSEStartUpStatus
RCC_DeInit(); //复位系统时钟
RCC_HSEConfig(RCC_HSE_ON); //开启HSE
HSEStartUpStatus=RCC_WaitForHSEStartUp(); //等待HSE稳定起振

if(HSEStartUpStatus==SUCCESS) //如果HSE稳定起振
{
RCC_HCLKConfig(RCC_SYSCLK_Div1);                      //选择HCLK(AHB)时钟源为SYSCLK 1分频
RCC_PCLK2Config(RCC_HCLK_Div1);                    //选择PCLK2时钟源为HCLK(AHB) 1分频
RCC_PCLK1Config(RCC_HCLK_Div2);                    //选择PLCK1时钟源为HCLK(AHB) 2分频
FLASH_SetLatency(FLASH_Latency_2);                    //设置FLASH延时周期数为2
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); //使能FLASH预取缓存
RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);    //选择PLL时钟源为HSE 1分频,倍频数为9,则PLL=8MHz*9=72MHz
RCC_PLLCmd(ENABLE); //使能PLL
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)==RESET);   //等待PLL输出稳定
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);    //以PLL作为系统时钟
while(RCC_GetSYSCLKSource()!=0x08);              //等待PLL成为有效系统时钟源
}

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1|RCC_AHBPeriph_DMA2,ENABLE);    //各外设时钟使能
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_ADC1|
                       RCC_APB2Periph_AFIO|RCC_APB2Periph_TIM1 |RCC_APB2Periph_USART1 ,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 |RCC_APB1Periph_USART2|RCC_APB1Periph_UART4|RCC_APB1Periph_UART5, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO初始化结构体GPIO_InitStructure

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ; //设置相应小灯管脚为推挽输出,最大翻转频率为50MHz | GPIO_Pin_4 | GPIO_Pin_5
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void USART1_Configuration(void)
{
    USART_InitTypeDef  USART_InitStructure; //定义USART初始化结构体USART_InitStructure
GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO初始化结构体GPIO_InitStructure
NVIC_InitTypeDef NVIC_InitStructure; //定义NVIC初始化结体NVIC_InitStructure
DMA_InitTypeDef DMA_InitStructure; //定义DMA初始化结构体DMA_InitStructure
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //选择NVIC优先级分组0

DMA_DeInit(DMA1_Channel4); //重置DMA 1通道配置
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base; //外设地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设作为数据目的地
DMA_InitStructure.DMA_BufferSize = BufferSize; //DMA缓存大小:BufferSize
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不递增
   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据宽度为8位
   DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //内存数据宽度为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //设置DMA通道优先级为高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //禁止DMA通道设置为内存至内存传输
DMA_Init(DMA1_Channel4, &DMA_InitStructure); //初始化
DMA_Cmd(DMA1_Channel4, ENABLE);
DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);   //配置DMA发送完成后产生中断

NVIC_InitStructure.NVIC_IRQChannel =USART1_IRQn ; //使能USART1全局中断,0级先占优先级,0级次占有先机
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //设置USART1的Tx脚(PA.9)为第二功能推挽输出模式
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; //设置USART1的Rx脚(PA.10)为悬空输入
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8位数据长度
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //奇偶失能
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制失能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //使能发送和接收模式
USART_Init(USART1, &USART_InitStructure); //根据USART_InitStruct中指定的参数初始化外设USART1寄存器

USART_ITConfig(USART1, USART_IT_RXNE,ENABLE); //使能USART1中断
    USART_Cmd(USART1, ENABLE); //使能USART1
}
void UART4_Configuration(void)
{
    USART_InitTypeDef  USART_InitStructure; //定义USART初始化结构体USART_InitStructure
GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO初始化结构体GPIO_InitStructure
NVIC_InitTypeDef NVIC_InitStructure; //定义NVIC初始化结体NVIC_InitStructure
DMA_InitTypeDef DMA_InitStructure; //定义DMA初始化结构体DMA_InitStructure
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //选择NVIC优先级分组0

DMA_DeInit(DMA2_Channel3); //重置DMA 1通道配置
DMA_InitStructure.DMA_PeripheralBaseAddr = UART4_DR_Base; //外设地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设作为数据目的地
DMA_InitStructure.DMA_BufferSize = BufferSize; //DMA缓存大小:BufferSize
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不递增
   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据宽度为8位
   DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //内存数据宽度为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //设置DMA通道优先级为高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //禁止DMA通道设置为内存至内存传输
DMA_Init(DMA2_Channel3, &DMA_InitStructure); //初始化
DMA_Cmd(DMA2_Channel3, DISABLE);

NVIC_InitStructure.NVIC_IRQChannel =UART4_IRQn ; //使能USART1全局中断,0级先占优先级,0级次占有先机
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //设置USART1的Tx脚(PA.9)为第二功能推挽输出模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //设置USART1的Rx脚(PA.10)为悬空输入
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8位数据长度
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //奇偶失能
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制失能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //使能发送和接收模式
USART_Init(UART4, &USART_InitStructure); //根据USART_InitStruct中指定的参数初始化外设USART1寄存器

USART_ITConfig(UART4, USART_IT_RXNE,ENABLE); //使能USART1中断
    USART_Cmd(UART4, ENABLE); //使能USART1
}

hechao3225 · 发表于 2014-1-16 22:02:42

楼主的代码我仔细看了一遍。。发现DMA2_Channel3（对应UART4）的完成中断没开是吗？DMA1_Channel4（对应USART1）的开了

lj250668420 · 发表于 2014-1-17 09:10:37

回复【2楼】hechao3225:
---------------------------------
贴上去的那个代码我后来修改了一下,这次中断已经打开了,但是还是没有数据发送出来
USART_InitTypeDef  USART_InitStructure; //定义USART初始化结构体USART_InitStructure
GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO初始化结构体GPIO_InitStructure
NVIC_InitTypeDef NVIC_InitStructure; //定义NVIC初始化结体NVIC_InitStructure
DMA_InitTypeDef DMA_InitStructure; //定义DMA初始化结构体DMA_InitStructure
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //选择NVIC优先级分组0

DMA_DeInit(DMA2_Channel3); //重置DMA 1通道配置
DMA_InitStructure.DMA_PeripheralBaseAddr = UART4_DR_Base; //外设地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设作为数据目的地
DMA_InitStructure.DMA_BufferSize = BufferSize; //DMA缓存大小:BufferSize
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不递增
   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据宽度为8位
   DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //内存数据宽度为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //设置DMA通道优先级为高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //禁止DMA通道设置为内存至内存传输
DMA_Init(DMA2_Channel3, &DMA_InitStructure); //初始化
DMA_ITConfig(DMA2_Channel3,DMA_IT_TC,ENABLE);   //配置DMA发送完成后产生中断
DMA_Cmd(DMA2_Channel3, DISABLE);

NVIC_InitStructure.NVIC_IRQChannel =UART4_IRQn ; //使能USART1全局中断,0级先占优先级,0级次占有先机
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //设置USART1的Tx脚(PA.9)为第二功能推挽输出模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //设置USART1的Rx脚(PA.10)为悬空输入
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 115200; //波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //8位数据长度
USART_InitStructure.USART_StopBits = USART_StopBits_1; //1个停止位
USART_InitStructure.USART_Parity = USART_Parity_No; //奇偶失能
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制失能
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //使能发送和接收模式
USART_Init(UART4, &USART_InitStructure); //根据USART_InitStruct中指定的参数初始化外设USART1寄存器

USART_ITConfig(UART4, USART_IT_RXNE,ENABLE); //使能USART1中断
        USART_Cmd(UART4, ENABLE);

lj250668420 · 发表于 2014-1-17 12:13:23

回复【楼主位】lj250668420:
---------------------------------
问题已经解决!第一个错误是通道错误,UART4的Tx通道是DMA2的第五通道,其次USART_DMACmd(UART4, USART_DMAReq_Tx, ENABLE);这个函数必须有,只是不知道为什么文档里说UART4没有使能位...到此结贴,分享给各位!