Other Parts Discussed in Thread: TMDSCNCD28P65X, SYSCONFIG
Tool/software:
Hi TI Team,
Microcontroller Used:
- uC: TMS320F28P650DK9
- Eval Board: TMDSCNCD28P65X
Description of microcontroller GPIO problem:
- The problem is that GPIO13 is always high, even after reset.
- When attempting to change the state of the pin directly via the GPADAT register during debug, the state of the pin is stuck at high and does not change.
- This is also the case when the evaluation board is removed from our custom PCB.
- This GPIO pin (GPIO13) was used to output the PWM signal of EPWM7B.
- It appears that the module EPWM7 is working as the PWM signal EPWM7A can be measured on GPIO12.
- The same problem was observed with another eval board (of the same type), but this time on GPIO15.
- GPIO15 was also used to output a PWM signal (EPWM8B).
- It appears that this problem occurs when measuring the PWM signals on an oscilloscope using passive probes.
Questions
- What could be the cause of such a problem? (e.g. over/under voltage)
- Is there any possibility to fix this GPIO?
BR FM
