Hi,
I am using STM8S105c6 , I have used timer1 software interrupt, to generate PWM. but I am not able yo control it, not duty cycle not frequency plz check code give and correct me.
Thanks in Advance
/*
* BMSBattery S series motor controllers firmware
*
* Copyright (C) Casainho, 2017.
*
* Released under the GPL License, Version 3
*/
#include <stdint.h>
#include <stdio.h>
#include "stm8s.h"
#include "gpio.h"
#include "stm8s_itc.h"
#include "stm8s_gpio.h"
#include "interrupts.h"
#include "stm8s_tim1.h"
#include "main.h"
#include "interrupts.h"
unsigned int ms_count=0;//Millisecond count
unsigned int flag = 0;
void InitLED();
void InitTIM1();
//void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void) __interrupt(TIM1_UPD_OVF_TRG_BRK_IRQHANDLER);
int main(void)
{
CLK_DeInit();
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
//CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);
disableInterrupts(); //First close the total interrupt
InitLED(); //Various initializations
InitTIM1();
enableInterrupts(); //Open total interrupt
while(1); //Enter the dead cycle and wait for the timer cycle to interrupt
}
/*********************************************************
Timer 1 updates interrupt processing function
Interrupt vectors can also be replaced by decimal system, which is used here for convenience.
Because the macro definition of the header file is in hexadecimal.
Function names can be written freely, just be happy.
*****************************************************/
void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void)
{
TIM1->SR1 &= ~(1<<0);//Clear interruption mark
/*ms_count++;
if(ms_count< 1000)//1ms*1000=1s
{
ms_count=0;
GPIO_WriteReverse(GPIOB, (GPIO_Pin_TypeDef)GPIO_PIN_4);
//PE_ODR ^= 1<<5;//LED lamp flipped once in 1s
}*/
/*if(flag == 0){
GPIO_WriteHigh(GPIOB, GPIO_PIN_4);
flag = 1;
}
else
{
GPIO_WriteLow(GPIOB, GPIO_PIN_4);
flag = 0;
}*/
GPIO_WriteReverse(GPIOB, (GPIO_Pin_TypeDef)GPIO_PIN_4);
//PE_ODR ^= 1<<5;//LED lamp flipped once in 1s
}
void InitTIM1()
{
TIM1->PSCRH=0;//Be sure to write high eight first
TIM1->PSCRL=0;//1 frequency division, timer clock equals system clock = 16MHz
TIM2->ARRH = 0x00; // High byte of 50,000.
TIM2->ARRL = 0x00; // Low byte of 50,000 //20Hz signal
TIM1->CNTRH= 0xFF;
TIM1->CNTRL= 0xFF;//It is necessary to clear down the counter
TIM1->IER |= 1<<0;//Enable tim1 update interrupt
TIM1->SR1 |= 1<<0;//Clear tim1 update interrupt flag
TIM1->CR1 |= 1<<7;//Allow reassembly to enable timer
TIM1->CR1 |= (1<<5);
TIM1->CR1 |= (1<<6);
TIM1->CR1 |= (1<<4);//Select Downward Counting Mode
TIM1->CR1 |= 1<<0;//Enabling counter
}
void InitLED()
{
GPIO_DeInit(GPIOB);
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_PP_LOW_FAST);
}
