I created a program on STM8S103F3 to generate a delay in rage of micro seconds using TIM2 module, but the timer is not ticking as expected and when I tried to call 1 sec delay using it, it is giving around 10 sec delay. I'm using 16MHz HSI oscillator and timer pre-scalar is set to 16. please see my code below. Please help me to figure out what is wrong with my code.
main()
{
GPIO_Init(FAN_PORT , FAN_PIN, GPIO_MODE_OUT_OD_LOW_SLOW ); // Need to change mode to push pull
GPIO_WriteLow(FAN_PORT , FAN_PIN);
Serial_begin(9600); //Initialize Serial communication at 9600 baud rate
Serial_print_string("\r\n>>>>>>>>>>>>>>>>Board Up and Ready<<<<<<<<<<<<<<<<<\r\n"); //print a string
while (1){
GPIO_WriteHigh(FAN_PORT , FAN_PIN);
delay_ms(1000);
GPIO_WriteLow(FAN_PORT , FAN_PIN);
delay_ms(1000);
}
}
void clock_setup(void)
{
CLK_DeInit();
CLK_HSECmd(DISABLE);
CLK_LSICmd(DISABLE);
CLK_HSICmd(ENABLE);
while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == FALSE);
CLK_ClockSwitchCmd(ENABLE);
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);
CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI,
DISABLE, CLK_CURRENTCLOCKSTATE_ENABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_ADC, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_UART1, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, DISABLE);
CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, DISABLE);
}
void delay_us(uint16_t us)
{
TIM2_DeInit();
TIM2_SelectOnePulseMode(TIM2_OPMODE_SINGLE);
TIM2_TimeBaseInit(TIM2_PRESCALER_16, us); //Prescalar value 8,Timer clock 2MHz
TIM2_Cmd(ENABLE);
while(!TIM2_GetFlagStatus(TIM2_FLAG_UPDATE));
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
}
void delay_ms(uint32_t ms)
{
while(ms--)
{
delay_us(1000);
}
}
