Posted on January 04, 2018 at 13:40Hello community,
i try to programm an code for my experimentation and i have a problem .. my code should change the duty cycle ie. the value of CCR2_V if the value of Convertion_Value_Current exceeds or is below a specific value .. as a result i want to see on the oscilloscope a changing pwm but it is still with the same duty cycle as defined in the main (CCR2_V=27)
the idea was to increment or decrement the value of the register, but it does not working. Have you any ideas where the problem can be?
Thanks
BG
&sharpinclude <stm8s.h>
&sharpinclude <stm8s_eval_lcd.h>
&sharpinclude <stdio.h>
uint8_t StrName[16]={0};
uint16_t Conversion_Value = 0;
float Stufe = 0.00488;
float Nominal_Min = 3.500;
float Nominal_Max = 4.500;
float Conversion_Value_Current = 0;
uint16_t CCR2_Val = 27 ;
uint8_t a = 50;
// Parametrisierung des PI Reglers !!!! MUSS NOCH IN MATLAB BESTIMMT WERDEN !!!! //
float kp = 0.001;
float tn = 0.04;
int main(void){
// Systemtakt
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
// Erzeuge PWM
TIM3_DeInit();
TIM3_TimeBaseInit(TIM3_PRESCALER_1, 45);
TIM3_OC2Init(TIM3_OCMODE_PWM1, TIM3_OUTPUTSTATE_ENABLE,CCR2_Val, TIM3_OCPOLARITY_HIGH);
TIM3_ARRPreloadConfig(ENABLE);
TIM3_OC2PreloadConfig(ENABLE);
TIM3_Cmd(ENABLE);
// Initialisiere ADC und LCD
STM8S_EVAL_LCD_Init();
GPIO_DeInit(GPIOB);
ADC2_DeInit();
GPIO_Init(GPIOB, GPIO_PIN_2, GPIO_MODE_IN_PU_NO_IT);
ADC2_Init(ADC2_CONVERSIONMODE_CONTINUOUS, ADC2_CHANNEL_2, ADC2_PRESSEL_FCPU_D4, ADC2_EXTTRIG_TIM, DISABLE , ADC2_ALIGN_RIGHT, ADC2_SCHMITTTRIG_CHANNEL9, DISABLE);
ADC2_Cmd(ENABLE);
LCD_Clear();
LCD_BacklightCmd(ENABLE);
ADC2_StartConversion();
LCD_SetCursorPos(LCD_LINE1, 0);
LCD_Print('Convers.Value.:');
LCD_Print(' ');
while(1)
{
while(!ADC2_GetFlagStatus()){}
Conversion_Value = ADC2_GetConversionValue();
Conversion_Value_Current = Conversion_Value*Stufe;
//Regelung der Duty Cycle f�r einen erw�nschten Ausgangsstrom
if(Conversion_Value_Current > Nominal_Max)
{
CCR2_Val--;
}
else if (Conversion_Value_Current < Nominal_Min)
{
CCR2_Val++;
}
TIM3_OC2Init(TIM3_OCMODE_PWM1, TIM3_OUTPUTSTATE_ENABLE,CCR2_Val, TIM3_OCPOLARITY_HIGH);
sprintf((char*)StrName, '%.3f ', (Conversion_Value*Stufe));
LCD_SetCursorPos(LCD_LINE2, 0);
LCD_Print(StrName);
ADC2_ClearFlag();
}
}
#stm8/128 #pwm-stm8 #stm8
