Posted on March 21, 2014 at 15:03
Hello,
I am using the STM32F429 board, I have configured the USART1 for TX (PA9) and RX (PA10). For testing purposes i send a buffer of 0x44 values down the USART. I monitor this tranmission on another boards RX pin and print the result to the terminal (for testing purposes). However the USART1 is sending garbage and i am not receiving the 0x
I don't think it is a problem with my code because it works perfectly on the STM32F407 when I loop RX and TX pin.
Any suggestions to why I am receiving garbage?
Thanks
void USART1_Configuration(void)
{
/* Define the GPIO initial structure */
GPIO_InitTypeDef GPIO_InitStructure;
/* Define the USART initial structure */
USART_InitTypeDef USART_InitStructure;
/* Define the NVIC initial structure */
NVIC_InitTypeDef NVIC_InitStructure;
/* GPIO Peripheral clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* USART2 Peripheral clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Configure PA9 and PA10 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure the Tx and Rx pins for USART3 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); //TX
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); //RX
/* USART1 mode configure */
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_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
/* Initialise and enable the USART1 */
USART_Init(USART1, &USART_InitStructure);
/* enable the interrupt */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
/* Enable the USART1 interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void USART1_IRQHandler(void)
{
static int rx_index = 0;
char aTextBuffer[50];
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) // Received characters modify string
{
rx_data[rx_index++] = USART_ReceiveData(USART1);
if (rx_index >= (sizeof(rx_data) - 1)){
rx_index = 0;
fin_flag = 1;
}
}
}
