static char usart2_dma_tx[256];
unsigned char usart2_tx_busy_flag = 0;
static char usart2_dma_rx[1024];
unsigned char usart2_rx_busy_flag = 0;
static void usart2_gpio_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2);
}
static void usart2_usart_init(unsigned int bauderate, unsigned short wordLength, unsigned short stopBits, unsigned short Parity)
{
USART_InitTypeDef USART_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
USART_InitStructure.USART_BaudRate = bauderate;
USART_InitStructure.USART_WordLength = wordLength;
USART_InitStructure.USART_StopBits = stopBits;
USART_InitStructure.USART_Parity = Parity;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
//USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
}
static void uart2_dmarx_config(uint8_t *mem_addr, uint32_t mem_size)
{
DMA_InitTypeDef DMA_InitStructure;
//串口收DMA配置
//启动DMA时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
//DMA通道配置
DMA_DeInit(DMA1_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
//外设地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (unsigned int)(&USART2->DR);
//内存地址
DMA_InitStructure.DMA_Memory0BaseAddr = (unsigned int)mem_addr;
//dma传输方向
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
//设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_BufferSize = mem_size;
//设置DMA的外设递增模式，一个外设
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//设置DMA的内存递增模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//外设数据字长
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//内存数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
//设置DMA的传输模式
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
//设置DMA的优先级别
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
//指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
//指定了FIFO阈值水平
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
//指定的Burst转移配置内存传输
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
//指定的Burst转移配置外围转移 */
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
//配置DMA1的通道
DMA_Init(DMA1_Stream5, &DMA_InitStructure);
//使能通道
DMA_Cmd(DMA1_Stream5,ENABLE);
USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
}
static void usart2_dma_init(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_DeInit(DMA1_Stream6);
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = 256;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)usart2_dma_tx;
DMA_Init(DMA1_Stream6, &DMA_InitStructure);
DMA_ITConfig(DMA1_Stream6, DMA_IT_TC, ENABLE);
uart2_dmarx_config(usart2_dma_rx,1024);
}
static void usart2_nvic_init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_Init(&NVIC_InitStructure);
}
void usart2_init(unsigned int bauderate, unsigned short wordLength, unsigned short stopBits, unsigned short Parity)
{
usart2_nvic_init();
usart2_gpio_init();
usart2_usart_init(bauderate, wordLength, stopBits, Parity);
usart2_dma_init();
}
void usart2_send(char *buf, unsigned char len)
{
while(usart2_tx_busy_flag) delay_ms(2);
usart2_tx_busy_flag = 1;
printf("== dma tx\n");
memcpy(usart2_dma_tx, buf, len);
DMA_SetCurrDataCounter(DMA1_Stream6, len);
DMA_Cmd(DMA1_Stream6, ENABLE);
USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);
}
/*****************USART2 TX******************/
void DMA1_Stream6_IRQHandler(void)
{
printf("== %d dma 1-6\n",__LINE__);
/* Test on DMA Stream Transfer Complete interrupt */
if (DMA_GetITStatus(DMA1_Stream6, DMA_IT_TCIF6))
{
/* Clear DMA Stream Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA1_Stream6, DMA_IT_TCIF6);
USART_DMACmd(USART2, USART_DMAReq_Tx, DISABLE);
DMA_Cmd(DMA1_Stream6, DISABLE);
usart2_tx_busy_flag = 0;
}
}
/*****************USART2 RX******************/
void DMA1_Stream5_IRQHandler(void)
{
printf("== %d dma rx\n",__LINE__);
/* Test on DMA Stream Transfer Complete interrupt */
if (DMA_GetITStatus(DMA1_Stream5, DMA_IT_TCIF6))
{
printf("== %d dma rx\n",__LINE__);
/* Clear DMA Stream Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA1_Stream5, DMA_IT_TCIF5);
USART_DMACmd(USART2, USART_DMAReq_Rx, DISABLE);
DMA_Cmd(DMA1_Stream5, DISABLE);
usart2_rx_busy_flag = 0;
}
}
/*****************USART2 RX******************/
void USART2_IRQHandler(void)
{
unsigned char ch;
unsigned int temp;
int i;
unsigned short l;
/* USART in mode Sender --------------------------------------------------*/
if(USART_GetITStatus(USART2, USART_IT_TXE) == SET)
{
printf("== usart tx\n");
USART_ClearITPendingBit(USART2, USART_IT_TXE);
}
/* USART in mode Receiver --------------------------------------------------*/
//if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET)
//{
// USART_ClearITPendingBit(USART2, USART_IT_RXNE);
// ch = USART_ReceiveData(USART2);
// printf("-%c",ch);
//}
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET) {
USART2->SR;
USART2->DR; //清USART_IT_IDLE标志
DMA_Cmd(DMA1_Stream5,DISABLE);
DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);
l = DMA_GetCurrDataCounter(DMA1_Stream5);
printf("++ rx:%d\n",l);
temp = 1024 - l;//DMA_GetCurrDataCounter(DMA1_Stream5);
for (i = 0;i < temp;i++)
{
printf("%c",usart2_dma_rx[i]);
}
//设置传输数据长度
DMA_SetCurrDataCounter(DMA1_Stream5,1024);
//打开DMA
DMA_Cmd(DMA1_Stream5,ENABLE);
}
}
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