Hello, I have a problem with setting up PWM on the general purpose timer. I tried setting PWM on timers 2 and 3 using different channels, but I didn't see a PWM signal at the output. I also tried setting up PWM from timer 1 and it worked, but I only need PWM from timer 3. I am using STM8L151K4. I attach the code below.
#define F_CPU 16000000UL // 16 MHz
#include "stm8l15x.h"
void CLK_Setup(void);
void GPIO_Setup(void);
main(){
// Setup
CLK_Setup();
GPIO_Setup();
TIM1_Setup();
PWM_Setup();
// mainloop
while (1){
}
}
void GPIO_Setup(void){
// Deinitialize all ports registers
GPIO_DeInit(GPIOA);
GPIO_DeInit(GPIOB);
GPIO_DeInit(GPIOC);
GPIO_DeInit(GPIOD);
// Init output pins
GPIO_Init(GPIOD, GPIO_Pin_4, GPIO_Mode_Out_PP_Low_Fast); // timer 1 channel 2
GPIO_Init(GPIOB, GPOID_Pin_2, GPIO_Mode_Out_PP_Low_Fast); // timer 2 channel 2
}
void CLK_Setup(void){
// Deinitialize the CLK peripheral registers to their default values.
CLK_DeInit();
// Enable High Speed External oscillator
CLK_HSEConfig(CLK_HSE_ON);
CLK_LSICmd(DISABLE);
CLK_HSICmd(DISABLE);
// Checking if clock flag is set
while(CLK_GetFlagStatus(CLK_FLAG_HSERDY) == FALSE);
CLK_ClockSecuritySystemEnable();
CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSE);
CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
CLK_PeripheralClockConfig(CLK_Peripheral_TIM1, ENABLE);
CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE);
}
// PWM on this timer works
void TIM1_Setup(void){
TIM1_DeInit();
TIM1_TimeBaseInit(16, TIM1_CounterMode_Up, 1000, 1);
TIM1_OC2Init( TIM1_OCMode_PWM1,
TIM1_OutputState_Enable,
TIM1_OutputNState_Enable,
500,
TIM1_OCPolarity_Low,
TIM1_OCNPolarity_Low,
TIM1_OCIdleState_Reset,
TIM1_OCNIdleState_Reset
);
TIM1_CtrlPWMOutputs(ENABLE);
TIM1_Cmd(ENABLE);
}
// PWM on this timer doesn't work
void PWM_Setup(void){
TIM2_DeInit();
TIM2_TimeBaseInit(TIM2_Prescaler_16, TIM2_CounterMode_Up, 1000);
TIM2_OC2Init( TIM2_OCMode_PWM1,
IM2_OutputState_Enable,
500,
TIM2_OCPolarity_Low,
TIM2_OCIdleState_Reset
);
TIM2_OC2PreloadConfig(ENABLE);
TIM2_Cmd(ENABLE);
}
