[STM32F4-Discovery] UART4 Problem

[regiuliano2009]

Posted on February 24, 2012 at 12:36

Hi 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

[jeannot]

Posted on May 12, 2015 at 16:29 hi, i am new on this page but i need some help. Please im working on STM32F4  and i want now to write an code with the microphono on board. I want to have finally an 16 bit on output of Pdm (PCM). there is a way to do it? thanks giovani