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I have a data logging pico and want to add an interrupt on the serial port that can take in a string and report back the right amount of data stored on the SD card. I was looking at UART.irq but that doesn't work on the Pico. How should I go about setting up this interrupt and data output?

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Since SDK version 1.5.0 there is a function stdio_set_chars_available_callback() (pico/stdio.h) Sorry, I just saw that your problem is related to MicroPython and not the C API

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