USART Pin Remapping

[blue_dolphin1987]

Posted on December 06, 2013 at 12:03

Hi ,

I am working on USART DMA for STM32F1 . Using one of Clive1 example i successfully got it working . However the program fails when i try to remap USART1 pin from PA9/PA10 to PB6/PB7. Is there something else that i miss out?

void USART_RCC_Configuration(void)
{
/* Enable DMA clock */
RCC_AHBPeriphClockCmd(COMM_USART_DMA_CLK, ENABLE);
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(COMM_USART_GPIO_CLK, ENABLE);
/* Enable UART clock */
RCC_APB2PeriphClockCmd(COMM_USART_CLK, ENABLE);
}
/**************************************************************************************/
void USART_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = COMM_USART_TxPin; 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(COMM_USART_GPIO, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = COMM_USART_RxPin; 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(COMM_USART_GPIO, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_Remap_USART1, ENABLE);
}
/**************************************************************************************/
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200;
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_Rx | USART_Mode_Tx;
/* USART configuration */
USART_Init(COMM_USART, &USART_InitStructure);
/* Enable the USART1 */
USART_Cmd(COMM_USART, ENABLE);
}
/**************************************************************************************/
char TxBuffer[] = ''The quick brown fox jumps over the lazy dog\r\n'';
char RxBuffer[6] = '' '';
void USART_DMA_Tx_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(COMM_USART_Tx_DMA_Channel);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&COMM_USART->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = sizeof(TxBuffer) - 1;
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_Low;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(COMM_USART_Tx_DMA_Channel, &DMA_InitStructure);
USART_DMACmd(COMM_USART, USART_DMAReq_Tx, ENABLE);
/* Enable DMA Stream Transfer Complete interrupt */
DMA_ITConfig(COMM_USART_Tx_DMA_Channel, DMA_IT_TC, ENABLE);
DMA_Cmd(COMM_USART_Tx_DMA_Channel, ENABLE);
}
void USART_DMA_Rx_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(COMM_USART_Rx_DMA_Channel);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&COMM_USART->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = sizeof(RxBuffer) - 1;
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_Low;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(COMM_USART_Rx_DMA_Channel, &DMA_InitStructure);
USART_DMACmd(COMM_USART, USART_DMAReq_Rx, ENABLE);
/* Enable DMA Stream Transfer Complete interrupt */
DMA_ITConfig(COMM_USART_Rx_DMA_Channel, DMA_IT_TC, ENABLE);
DMA_Cmd(COMM_USART_Rx_DMA_Channel, ENABLE);
}
/**************************************************************************************/
void COMM_USART_DMA_TX_IRQHandler(void) // USART1_TX
{
/* Test on DMA Transfer Complete interrupt */
if (DMA_GetITStatus(COMM_USART_Tx_DMA_FLAG))
{
/* Clear DMA Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(COMM_USART_Tx_DMA_FLAG);
/* ... */
}
}
/**************************************************************************************/
void COMM_USART_DMA_RX_IRQHandler(void) // USART1_RX
{
/* Test on DMA Transfer Complete interrupt */
if (DMA_GetITStatus(COMM_USART_Rx_DMA_FLAG)) 
{
if (strcmp(''Hello'',RxBuffer) == 0){
strcpy(TxBuffer, ''I See Hello''); 
}else{
strcpy(TxBuffer, ''Confused'');
}
USART_DMA_Tx_Configuration();
while (DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET);
USART_DMA_Rx_Configuration();
memset(RxBuffer,'\0',sizeof(RxBuffer)); 
/* Clear DMA Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(COMM_USART_Rx_DMA_FLAG);
/* ... */
}
}
/**************************************************************************************/
void USART_NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the Priority Group to 2 bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the USART1 TX DMA Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART1 RX DMA Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
#define COMM_USART USART1
#define COMM_USART_GPIO GPIOB
#define COMM_USART_CLK RCC_APB2Periph_USART1
#define COMM_USART_GPIO_CLK RCC_APB2Periph_GPIOB
#define COMM_USART_RxPin GPIO_Pin_7
#define COMM_USART_TxPin GPIO_Pin_6
#define COMM_USARTz_DR_Base 0x40013804
#define COMM_USART_IRQn USART1_IRQn
#define COMM_USART_DMA_CLK RCC_AHBPeriph_DMA1
#define COMM_USART_Tx_DMA_Channel DMA1_Channel4
#define COMM_USART_Tx_DMA_FLAG DMA1_IT_TC4
#define COMM_USART_Rx_DMA_Channel DMA1_Channel5
#define COMM_USART_Rx_DMA_FLAG DMA1_IT_TC5
#define COMM_USART_DMA_TX_IRQHandler DMA1_Channel4_IRQHandler
#define COMM_USART_DMA_RX_IRQHandler DMA1_Channel5_IRQHandler 

#usart #wait-for-you--clive1-!-!-! #dma

[jzawadzk]

Posted on December 06, 2013 at 13:03

I think you should also enable AFIO:

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,

ENABLE

);

[blue_dolphin1987]

Posted on December 16, 2013 at 02:45yes that does it . Thanks qubas