Posted on May 29, 2016 at 11:50Hi All,
I have new application used STM8S003, The MCU using timer1 or timer2 to generator 125khz PWM, duty cycle is 50% with 8Mhz HSI clock source.
- This is my code to initial time2:
static void Timer2_Init(void)
{
//Reset value:
TIM2_DeInit();
//Config clock for timer2:
//timer freq = (clock CPU/8) -> 1bit = 1uS -> 8*1uS=8uS (125khz).
TIM2_TimeBaseInit(TIM2_PRESCALER_8,8);
/* PWM1 Mode configuration: Channel1 */
TIM2_OC1Init(TIM2_OCMODE_PWM2, TIM2_OUTPUTSTATE_ENABLE,500, TIM2_OCPOLARITY_HIGH);
TIM2_OC1PreloadConfig(ENABLE);
TIM2_ARRPreloadConfig(ENABLE);
TIM2_Cmd(ENABLE);
}
- System clock init:
static void System_init(void)
{
CLK_DeInit();
CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);//CPU Prescaler = 1/
CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV2);//Prescaler = 8, 16Mhz
//CLK_CCOCmd(ENABLE);
CLK_CCOConfig(CLK_OUTPUT_CPUDIV64);//Output clock on CCO pin.
CLK_ClockSwitchConfig(
CLK_SWITCHMODE_AUTO,//Enable the automatic clock switching mode
CLK_SOURCE_HSI ,//Clock Source HSI.
DISABLE , //Disable interrupt
CLK_CURRENTCLOCKSTATE_DISABLE//Current clock enable
);
CLK_PeripheralClockConfig (CLK_PERIPHERAL_TIMER1,ENABLE);
CLK_PeripheralClockConfig (CLK_PERIPHERAL_TIMER2,ENABLE);
CLK_PeripheralClockConfig (CLK_PERIPHERAL_TIMER4,ENABLE);
//HSI Presscaler (1,2,4,8)
//CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//Setting 16Mhz.
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV2);//Setting 8Mhz.
//CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV4);//Setting 4Mhz.
//CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV128);//Setting 125khz.
//While until HSI is ready!
while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY)!=SET);
}
This code is not working when generator 125Khz, but I did change output to 3khz it is work well, I don't know reason of MCU. I have try with timer1 result is same.
Please help me to review my code and help me to fix that.
Thanks
#pwm125k-with-stm8s
