Posted on February 24, 2012 at 12:36Hi all,
I'm searching to get work my UART4 port on my Discovery. I used the USART HyperTerminal_Interrupt example on stdPerif_example and I adapted to DISCOVERY.
I see by some LedOn on the program that UART is working and sending interrupt.
I manage to have a virtual USB-UART port with UM232R Ftdi but on my Putty nothing appeared
I post my code
/* USARTx configuration ------------------------------------------------------*/
/* USARTx configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- Two Stop Bit
- Odd parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_Odd;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
STM_EVAL_COMInit(&USART_InitStructure);
Function
void STM_EVAL_COMInit(USART_InitTypeDef* USART_InitStruct)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
//RCC_AHB1PeriphClockCmd(UART4_TX_PIN | UART4_RX_PIN, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); //clock a PORTC
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); //clock alla UART4!
/* Connect PXx to USARTx_Tx*/
GPIO_PinAFConfig(GPIOC, GPIO_Pin_10, GPIO_AF_UART4);
/* Connect PXx to USARTx_Rx*/
GPIO_PinAFConfig( GPIOC, GPIO_Pin_11, GPIO_AF_UART4);
/* Configure USART Tx as alternate function */
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* USART configuration */
USART_Init(UART4, USART_InitStruct);
/* Enable USART */
USART_Cmd(UART4, ENABLE);
}
I also add
void UART4_IRQHandler(void); to _it.h to manage interrupt
_it.c
void UART4_IRQHandler(void)
{
if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)
{
GPIO_SetBits(GPIOD, GPIO_Pin_14); // accende led
/* Read one byte from the receive data register */
RxBuffer[RxCounter++] = (USART_ReceiveData(UART4) & 0x7F);
if(RxCounter == NbrOfDataToRead)
{
/* Disable the UART4 Receive interrupt */
USART_ITConfig(UART4, USART_IT_RXNE, DISABLE);
}
}
if(USART_GetITStatus(UART4, USART_IT_TXE) != RESET)
{
GPIO_SetBits(GPIOD, GPIO_Pin_13); // accende led
/* Write one byte to the transmit data register */
USART_SendData(UART4, TxBuffer[TxCounter++]);
if(TxCounter == NbrOfDataToTransfer)
{
/* Disable the UART4 Transmit interrupt */
USART_ITConfig(UART4, USART_IT_TXE, DISABLE);
}
}
}
Where I'm failing?
THanks
#uart/usart-parity-and-wordlengt
