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WHich port do you use. STM32 and MIMXRT port have the habit to mount the SD card as standard path when it is inserted at boot time. Then MicroPyhton looks for boot.py and main.py at the SD card. Built-in modules should still be accessible. |
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I'm using a PyBoard V1.0, firmware MicroPython v1.24.1, with the USB port plugged into my PC. The SD card appears as PYBSD (D:) in Windows 11 File Explorer. My Python program is on the SD card. I am using Thonny. Thonny is set up to use the "Micropython (generic)" interpreter on the following port: "Pyboard Virtual Comm Port in FS Mode @ COM3". |
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help() produces the standard help message. I can import pyb (for example) at the REPL. The source code starts with "from pyb import Timer". The following statement fails from the SD but succeeds from the flash: "pwm_update_timer = pyb.Timer(PWM_UPDATE_TIMER_NO, freq=PWM_UPDATE_FREQ)" |
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Ok. I changed "pwm_update_timer = pyb.Timer(PWM_UPDATE_TIMER_NO, freq=PWM_UPDATE_FREQ)" to "pwm_update_timer = Timer(PWM_UPDATE_TIMER_NO, freq=PWM_UPDATE_FREQ)" and it worked. So probably my mistake, but why the original works from flash but not SD is a mystery to me. |
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As said, when starting with am SD card inserted, boot.py and main.py from the SD card are used. The boot.py or main.py from flash may import pyb, causing pyb.Timer() to work. |
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When I plug in an SD card and put my source code on it, the compiler can no longer find the Micropython libraries, e.g. "NameError: name 'pyb' isn't defined". The same code compiles and runs when it's on the flash drive. What am I missing? Do I have to put all my imports in the boot file, perhaps? Sorry - I have looked around, but I can't find the answer.
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