Posted on July 14, 2016 at 14:09Hi I am prashant. I am using stm8s microcontroller with uart2 . First thing is that when i am using uart explicitly without configure the clock to 16Mhz ( HSI clock), uart throwing the garbage values. Secondly when i configure the clock to HSI(16Mhz) , program gets blocked to wait for the TXE bit (UART2_FLAG_TXE) to set forever. It happens only when i configure the system clock to HSI otherwise throw the garbage value.
I am posting my code below.
&sharpinclude ''stm8s_uart2.h''
&sharpinclude ''stm8s_clk.h''
void clk_config()
{
//CLK_DeInit();
//CLK_HSICmd(ENABLE);
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
}
void uart_config()
{
UART2_DeInit();
UART2_Init(9600, UART2_WORDLENGTH_8D, UART2_STOPBITS_1, UART2_PARITY_NO, UART2_SYNCMODE_CLOCK_DISABLE, UART2_MODE_TXRX_ENABLE);
UART2_Cmd(ENABLE);
}
int main( void )
{
//clk_config();
uart_config();
while(1)
{
UART2_SendData8('P'); //sending some garbage value rather character 'P' when HSI clock isn't configured.
while(UART2_GetFlagStatus(UART2_FLAG_TXE) == RESET); //program remains blocked here if i uncomment the clock_config()
}
return 0;
}
#hsi #stm8s #uart #stm8
