Hello Peter here is the sine structure of the code and the pmw value, here i want to know the relation between the duty cycle and sine signal and change the amplitude to gain more vibration
static void LoadValueIntoSinStruct(void)
{
uint8_t offset=0,diff=0;
while(offset <= (nbr_of_samples_half/2))
{
/*First half of upper half samples of sine wave is loaded into "value" of sin structure.*/
sin.Value[offset] = sample[offset];
offset++;
}
diff = (uint8_t)(offset - 1);
while(offset < nbr_of_samples_half)
{
diff--;
/* Second half of upper half samples of sine wave is loaded into "value" of sin structure.*/
sin.Value[offset] = sample[diff];
offset++;
}
/*Index is initialized to 0.Sin wave upper half is generated at start*/
sin.Index = 0;
sin.Up = TRUE;
}
INTERRUPT_HANDLER(TIM2_UPD_OVF_BRK_IRQHandler, 13)
{
uint8_t PWM_Value = 0;
if (counter >= COUNTER)
{
/* Reset the counter value*/
counter = 0;
/* Upper half cycle of sine wave */
if (sin.Up == TRUE)
{
/* Load the duty cycle register for upper half cycle of sine wave.*/
/* This is achieved by adding sample values into AVERAGE_AMP.*/
PWM_Value = (uint8_t)(AVERAGE_AMP + sin.Value[sin.Index]);
}
else
{
/* Lower half cycle of sine wave */
/* Load the duty cycle register for lower half cycle of sine wave. */
/* This is achieved by subtracting sample values into AVERAGE_AMP. */
PWM_Value = (uint8_t)(AVERAGE_AMP - sin.Value[sin.Index]);
}
/* Set the Capture Compare1 Register value */
// TIM2_SetCompare1(PWM_Value);
TIM2->CCR1H = (uint8_t)(PWM_Value >> 8);
TIM2->CCR1L = (uint8_t)(PWM_Value);
/*Increment the index for pointing to wardsnext sample value to be loaded */
sin.Index++;
if (sin.Index == nbr_of_samples_half)
{
/* Reset the index value */
sin.Index = 0;
/* Lower half sin wave is activated if previously it was upper half and vice-versa */
sin.Up = (bool_t)(~sin.Up);
}
}
/* Increment the counter value at each overflow interrupt */
counter++;
//TIM2_ClearITPendingBit(TI21_IT_UPDATE);
TIM2->SR1 = (uint8_t)(~(uint8_t)TIM2_IT_UPDATE);
}
