Posted on March 26, 2012 at 16:03Hi, I not having much success with using the UART (USART1) on my F4Discovery board (STM32F407). I am pretty new to STM32 and Keil (the IDE I am using). Here's my code:
&sharpinclude ''stm32f4_discovery.h''
&sharpinclude ''stm32f4xx_usart.h''
&sharpinclude ''stm32f4xx.h''
void usartSetup(void);
void USART_PutChar(uint8_t ch);
int main (void) {
usartSetup();
USART_PutChar(0); //I realise this won't send a 0
USART_PutChar(8); //I realise this won't send an 8
USART_PutChar(255); //I realise this won't send a 255
while (1) {
//loop forever
}
}
void usartSetup (void) {
USART_InitTypeDef USART_InitStructure;
//USART_StructInit(&USART_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
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_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void USART_PutChar(uint8_t ch) {
USART_SendData(USART1, (uint16_t) 0x49);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, (uint16_t) 0x49);
}
I'd be very grateful if someone could help. It never sends the 0x49 out of the UART1 TX (have checked pin PA9 and PB6) and then gets endlessly stuck on the while(USART_GetFlagStatus...). I am observing using the Keil debugger and see it get stuck in the while. I also have a scope probe on the TX pin and never see anything.
I am including the stm32f4xx_usart.c driver into the project.
Thanks!
#rs232-uart-usart-f4discover-407 #uart #stm32f4discovery
