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This content is originally created by EEWORLD forum user tiankai001. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source. Msp430 MCU Development Record (9) Phenomenon: AD conversion function debugging, the sampling and holding time is short, the measured voltage is 0, modify the program, add a delay before the register configuration is completed and the AD conversion starts, as the delay time increases, the measured voltage becomes higher and higher, after the delay reaches 700MS, the voltage is the power supply voltage. The sampling and holding time is changed to a longer time, no delay is added before the AD conversion, and the voltage is normal after the third voltage acquisition. Test: The AD conversion function was available in every product before, and it was normal. Only this time there was a problem, it must not be a problem with the AD conversion program, but there was a problem with the program before the AD conversion. Finally, it was found that when the port was initialized, this AD conversion channel was set to the output direction, which caused the values of the first few AD conversions to be incorrect. Verification: When the port is initialized, set the port corresponding to the AD conversion to input status. After repeated tests, the collected voltage value remains stable Remarks: The port corresponding to the AD conversion needs to be set as the input port in advance. If the port is set from output to input at the beginning of the AD conversion, an appropriate delay is required to obtain the correct voltage value.
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