I'm testing printf() out on USART1 and UART5 of STM32F3DISCOVERY Board.
USART1 tx (PC4) <-> RS232C converter
UART5 Tx (PC12) <-> RS232C converter
printf() out on USART1 is working normally. but, printf() out on UART5 is not working.
Could you please check my code?
Best regards,
[Code for USART1 Tx Configuration ]
// Retargets the C library printf function to the UART
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif // __GNUC__
PUTCHAR_PROTOTYPE
{
// Place your implementation of fputc here
// e.g. write a character to the USART
USART_SendData(USART1, (uint8_t) ch);
// Loop until transmit data register is empty
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET){}
return ch;
}
void ConfigureUSART1(void)
{
// Enable GPIO clock
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
// Configure USART1 Tx as alternate function push-pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Connect PC4 to USART1 Tx
GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_7);
// Configure USART
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 19200;
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 configuration
USART_Init(USART1, &USART_InitStructure);
// Enable USART
USART_Cmd(USART1, ENABLE);
}
[Code for UART5 Tx Configuration]
// Retargets the C library printf function to the UART
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif // __GNUC__
PUTCHAR_PROTOTYPE
{
// Place your implementation of fputc here
// e.g. write a character to the USART
USART_SendData(UART5, (uint8_t) ch);
// Loop until transmit data register is empty
while (USART_GetFlagStatus(UART5, USART_FLAG_TXE) == RESET){}
return ch;
}
void Configure(void)
{
// Enable GPIO clock
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
// Configure USART5 Tx as alternate function push-pull
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Connect PC12 to USART5 Tx
GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_7);
// Configure UART
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 19200;
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;
// UART configuration
USART_Init(UART5, &USART_InitStructure);
// Enable UART
USART_Cmd(UART5, ENABLE);
}
