DSP2812 full comparison PWM output problem

xzyxtt

DSP2812 full comparison PWM output problem [Copy Link]

I use 2812 full comparison unit to generate PWM. In the interim, PWM1, PWM3, and PWM5 output 1KHz PWM waves with a duty cycle of 40%, and PWM2, PWM4, and PWM6 output complementary waveforms. Now I find two problems:
(1) Oscilloscope measurement shows that the output waveform amplitude of PWM1 and PWM2 is about 3V, but the output waveform amplitude of other four PWM channels is about 1.5V
（2）

1. /*EvaRegs. ACTRA.bit.CMP1ACT=1; //PWM1 comparison match is low and effective
   
2.         EvaRegs. ACTRA.bit.CMP2ACT=2; //PWM2 comparison match is highly effective
   
3.         EvaRegs. ACTRA.bit.CMP3ACT=1; //PWM3 comparison matching is low and effective
   
4.         EvaRegs. ACTRA.bit.CMP4ACT=2; //The PWM4 is relatively matched and highly effective
   
5.         EvaRegs. ACTRA.bit.CMP5ACT=1; //PWM5 match is low and effective
   
6.         EvaRegs. ACTRA.bit.CMP6ACT=2; //PWM6 is relatively matched and highly effective
   
7.         EvaRegs. ACTRA.bit.D=0;
   
8.         EvaRegs. ACTRA.bit.SVRDIR=0;*/

Copy Code

If the ACTRA register is assigned by bit operation, there is no PWM output, but if the overall assignment is adopted, there is PWM output

1. EvaRegs.ACTRA.all=0x0999;

Copy Code