Posted on February 18, 2014 at 11:59I'm working with the STM32F051
I have this code which works for usart1 but not for usart2.
appreciate any help
-Gilad
#include ''stm32f0xx.h''
#define UART2
#ifdef UART1
#define USARTx USART1
#define DATA 0x31
#else
#define USARTx USART2
#define DATA 0x32
#endif
void main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable GPIO A clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
#ifdef UART2
/* Enable USART2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
#else
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Configure the HSI as USART clock */
RCC_USARTCLKConfig(RCC_USART1CLK_HSI);
#endif
/* Configure USART Rx & Tx as alternate function */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;//GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Mux out USART2 Rx & Tx */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1/*GPIO_AF_USART2*/); // PA2 USART2_TX
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1/*GPIO_AF_USART2*/); // PA3 USART2_RX
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;//USART_Parity_None;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* USART configuration */
USART_Init(USARTx, &USART_InitStructure);
/* Enable USART */
USART_Cmd(USARTx, ENABLE);
while(1)
{
while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET); /* Waitwhile TX full */
USART_SendData(USARTx, DATA);
}
}
