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GENERATING A HIGH RESOLUTION SINEWAVE USING ST7 PWMART

Figure 3. Loading of sample values and initialization of sin structure

3.2 AUTO-RELOAD TIMER INITIALIZATION

The counter is initialized by:

– Writing to the ARTARR register to set the PWM frequency.

– Setting the FCRL (Force Counter Re-Load), the TCE (Timer Counter Enable) and OIE (Over-

flow Interrupt Enable) bits in the ARTCSR register.

application).

– Enable PWM0 and configure the polarity in the PWMCR register.

– Initialize the PWMDCR0 register to define the PWM duty cycle.

LoadValueIntoSinStructur

Load sample values (already defined)

into value[no_of_samples_half] of sin

structure (the no of samples in half sin

wave is already defined)

Initialize sinewave for up-

per half

return

Initialize Index=0