Tool/software:
Hello TI team,
I am using the TMS320F28P559SJ9PZRQ1 MCU and trying to perform an ADC-DAC loopback test as part of self-test diagnostics.
Status:
-
The loopback code works correctly on the XF28P559SJ9PZQ LaunchPad. The DAC is configured to output a known voltage, which is then read back via an ADC channel.
- However, when running the same code on my custom hardware (also using the F28P559SJ9PZRQ1), the ADC does not return the expected value. The ADC result is incorrect , indicating the loopback is failing.
Observations:
-
DAC and ADC initialization is identical on both platforms.
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DAC reference and output enable settings have been verified.
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On the custom board, it appears the DAC output is not reaching the ADC input internally.
Questions:
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Are there any device-level configuration requirements or errata that could cause this behavior only on the custom board?
-
Is there any difference in internal analog signal routing between the LaunchPad and standalone devices that might affect this?
-
Any guidance to debug or validate the DAC output path and ADC sampling under loopback conditions?
I’d appreciate any tips or documentation pointers. I can share the initialization code if needed.
