Kinetis Microcontrollers中的主题 Re: Kinetis DAC hardware triggering

Kinetis DAC hardware triggering

philwoods — Wed, 07 Jun 2017 14:13:31 GMT

I'm having issues getting the DAC to work via hardware triggering using the PDB. I'm using the MKV31F512. I've had the DAC running fine using software triggering, but get no output on the DAC trying to trigger via hardware using the PDB output with PIT0 trigger input to the PDB using PDB interval trigger 0. In the debugger the PDB0 peripheral register does not populate, making it difficult to see what's going on. Any insight would be appreciated. Code is attached.

Original Attachment has been moved to: main.c.zip

Re: Kinetis DAC hardware triggering

jorge_a_vazquez — Tue, 20 Jun 2017 20:13:46 GMT

Hi Phil Woods

Please check the following post:

Using PIT channel 0 as a PDB trigger input source

Here are some recommendations for PIT as PDB trigger. I saw in your code that you have enable continuous mode in PDB, when PIT trigger PDB, PDB will trigger DAC according to PDB INT count. Do you need to synchronize the your PDB with PIT, or why do you need to use PIT in your application?

I also recommend you to check the following post:

K22F DAC trigger documentation

PIT, PDB to trigger DAC

They could help you in your final application and understanding PDB module.

Best Regards

Jorge Alcala

Re: Kinetis DAC hardware triggering

xiangjun_rong — Tue, 27 Jun 2017 08:05:03 GMT

Hi, Phil,

Based on your requirement, I developed an example with TWR-KV31F120M without SDK, it works fine, I update the DAC value in PDB delay interrupt routine.

Hope it can help you

Xiangjun Rong