MicroPython • Re: Experiments in chaining DMA to PIO - strange error and room for improvement?

Viper supports its own set of types namely int, uint (unsigned integer), ptr, ptr8, ptr16 and ptr32. The ptrX types are discussed below.
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Viper provides pointer types to assist the optimiser. These comprise
ptr Pointer to an object.
ptr8 Points to a byte.
ptr16 Points to a 16 bit half-word.
ptr32 Points to a 32 bit machine word.

The concept of a pointer may be unfamiliar to Python programmers. It has similarities to a Python memoryview object in that it provides direct access to data stored in memory. Items are accessed using subscript notation, but slices are not supported: a pointer can return a single item only. Its purpose is to provide fast random access to data stored in contiguous memory locations - such as data stored in objects which support the buffer protocol, and memory-mapped peripheral registers in a microcontroller. It should be noted that programming using pointers is hazardous: bounds checking is not performed and the compiler does nothing to prevent buffer overrun errors.

Statistics: Posted by gmx — Fri Sep 12, 2025 9:19 pm