Hello everyone,
I am new to Kinetis microcontrollers and Kinetis SDK development, I own a TWR-KV31120M board and I am trying to set a project up in KDS using SDK and PE.
I was able to create a PWM output and change its duty cycle in software, but I am now trying to update the value from RAM using DMA.
I created and configured a fsl_edma component:
This led to the generation of initialization code for DMA, which initializes DMA, requests a channel, and installs a callback function.
If I understand correctly now it's up to me to configure the loop with EDMA_DRV_ConfigLoopTransfer and start it with EDMA_DRV_StartChannel.
I am trying to have the content of a 16-bit variable, pwmduty, to the TPM0_C0V register (also 16-bit).
This is the way I am doing the calls to the functions:
if (EDMA_DRV_ConfigLoopTransfer(&dmaController1_ChnState0,&descriptor,
kEDMAMemoryToPeripheral,
(uint32_t)&pwm_duty,
(uint32_t)&FTM0_C0V,
2,
2,
2,
0
) == kStatus_EDMA_Success) {
EDMA_DRV_StartChannel(&dmaController1_ChnState0);
}
While the code above is executed (and the first call returns success) I placed a breakpoint on the callback function and never see it called in debug...
Do you know what am I doing wrong?
Thank you very much for any suggestion you may have.
Best regards,
Antonio
