CC2340R5: PWM complementary pin does not has output when used alone

 Hi Shuyang,

This is likely an issue in the PWM driver (missing feature). The PWM driver also uses the LGPT driver, so the issue could be from there too.

Here are some related posts:

(+) CC2340R5: One LGPTimer with 2 different frequency PWM output? - Bluetooth forum - Bluetooth®︎ - TI E2E support forums

(+) CC2340R5: how to use one LPGT to send 3 PWM output on different different channel - Bluetooth forum - Bluetooth®︎ - TI E2E support forums

Have you already taken a look within the PWM and LGPT drivers?

If needed I can take a deeper look at this in the next 2-4 business days.

Thanks,
Toby

Hi Toby,

I have not looked into the driver yet, please help to take a look, thanks.

Beat regards,

Shuyang

Hi Toby,

I found the root cause of this issue. PWMTimerLPF3_getPwmChannelNo() does not check hwAttrs->channelConfig[x].npin which represents the state of the complementary channel:

Therefore if a complementary channel is enabled without corresponding channel enabled, PWMTimerLPF3_getPwmChannelNo() will return LGPTimerLPF3_CH_NO_2 regardlessly:

I tried the following fix and it is working:

Would you help review if this fix is proper and add the fix to a future SDK? Thanks.

Best regards,

Shuyang

Hi Shuyang,

Thanks for sharing the fix, it looks good to me.

I have filed a ticket internally to get it handled in SDK.

Thanks,
Toby