Posted on April 22, 2014 at 10:50
Hi,
i have problems with usart communication with other cpu. I use stm32f150rb, UART4. My code:
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);
GPIO_InitTypeDef gpioInit;
// rx = PC11
gpioInit.GPIO_Speed = GPIO_Speed_2MHz;
gpioInit.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpioInit.GPIO_Pin = GPIO_Pin_11;
GPIO_Init(GPIOC, &gpioInit);
// tx = PC10
gpioInit.GPIO_Speed = GPIO_Speed_2MHz;
gpioInit.GPIO_Mode = GPIO_Mode_AF_PP;
gpioInit.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOC, &gpioInit);
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0 );
/* Enable the USARTy Interrupt */
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_DeInit(UART4 );
USART_InitTypeDef usartInit;
usartInit.USART_BaudRate = 9600;
usartInit.USART_WordLength = USART_WordLength_8b;
usartInit.USART_StopBits = USART_StopBits_1;
usartInit.USART_Parity = USART_Parity_No ;
usartInit.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
usartInit.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(UART4, &usartInit);
USART_Cmd(UART4, ENABLE);
USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
void UART4_IRQHandler() {
uint16_t rec = USART_ReceiveData(UART4 );
reciv_arr[receiv++] = rec & 0xFF;
if (receiv == 100 || reciv_arr[receiv - 1] == '\r'
|| reciv_arr[receiv - 1] == '\n') {
receiv = 0;
}
}
void send(char* buffer, int len) {
int i = 0;
for (; i < len; ++i) {
while (USART_GetFlagStatus(UART4, USART_FLAG_TXE ) == RESET)
;
USART_SendData(UART4, buffer[i]);
}
}
Sending looks ok - TXE is changing. RX cpu pin is connected to GND with 5k6 resistor if this matters. RX interrupt is never called.
Does the init code looks ok?
#selective-cut-n-paste
