Posted on February 05, 2013 at 08:41I am using stm32f107rct6 with 25Mhz freq for usart communication. i am sending character 'a' from PC but i am receiving some unwanted data like 'FE' and i am receiving the same data no change , so pls let me known why is this happening , i have tested the same code in stm32f103rb series in 8Mhz frequency its working fine
the configuration and the code i have done is shown below ,plz solve this as early as possible and its very critical , it is an online project.even i have attached the .c-file
#include<stdio.h>
#include<stm32f10x_lib.h>
void RCC_Config(void);
void GPIO_Config(void);
unsigned int temp,x;
char ch;
main()
{
RCC_Config();
// SystemInit();
GPIO_Config();
USART1->BRR=0x341;//0xA2C; //9600 baud rate
USART1->CR1=0x0000006D; //TCIE &RXNEIE(read data reg not empty interrupt enable)
USART1->CR2=0x000; //eable clock
USART1->CR1|=0x2000;
NVIC->ISER[1] = 0x25;//USART1_IRQChannel //(1 << (USART1_IRQChannel & 0x1F));//0x00000020;
USART1->CR1|=0x00002000;
while(1)
{
;
}
}
void RCC_Config(void)
{
RCC->APB2ENR=0x00004004;
}
void GPIO_Config(void)
{
AFIO->MAPR=0x00000000;
GPIOA->CRH = (GPIOA->CRH & 0xFFFFF00F)|0x4B0;
}
void USART1_IRQHandler(void)
{
if ((USART1->SR & 0x20))
{
temp=1;
ch=USART1->DR;
x=USART1->SR;
}
else if ((USART1->SR & 0x40))
{
if (temp==1)
{
x=USART1->SR;
temp=0;
USART1->DR=ch;
}
}
}
