pxt-calliope/docs/device/error-codes.md

Error codes

Your @boardname@ may encounter a situation that prevents it from running your code. When this happens, a frowny face will appear on your @boardname@ screen (see picture) followed by an error number. These are called panic codes.

Below is a list of error numbers and what they mean:

• 10 (MICROBIT_I2C_LOCKUP): the @boardname@'s I2C bus is not working
• 20 (MICROBIT_OOM): there is no free memory on the @boardname@
• 30 (MICORBIT_HEAP_ERROR): a problem in the heap space.
• 40 (MICROBIT_NULL_DEREFERENCE ): there was a NULL dereference, the @boardname@ tried to manage a invalid object pointer.
• 42 (MICROBIT_SYSTEM_ERROR): there's an error condition in the @boardname@ system software.
• 43 (MICROBIT_NO_RADIO): the @boardname@ can't enable the radio.
• 98 (MICROBIT_ASSERTION_FAILED): assertion failed, the condition in an assert was false.

basic.showLeds(`
    # . . . #
    # # . # #
    . . . . .
    . # # # .
    # . . . #
    `)

See also

panic, assert,