In center align mode SPWM generation may I need give the same CCR value in the LUT

[thannara123]

Hi ,

 In SPWM generation ,in Center align mode ,May i require give one sine table value twice , in the upword and down counting sequence . 

 

Original sine wave values: [A1, A2, A3, ..., A200]
DMA array: [A1, A1, A2, A2, A3, A3, ..., A200, A200]

 

like wise the DMA array ?

other wise is it distroted ?

 

@MM..1 

 

[TDK]

It depends on how your values are generated, but you are not required to duplicate values and doing so will make your sine wave more distorted, in general.

 

[thannara123]

if it duplicate , in one pwm cycle there are two ccr value , is it distrote the wave . please how do i to get a smooth sinewave ?

 

[Sarra.S]

Hello,

In center-aligned PWM mode, the counter counts both up and down within a single period. This means that each value in the sine wave table will be used twice: once during the up-counting phase and once during the down-counting phase. I think you should try to provide each sine table value twice in the DMA array