How do I read uint32_t values out of a nested PROGMEM array?

Question

I have an array of 16x16 matrices of uint32_t values: const uint32_t sprites[][16][16] PROGMEM = { ... }; I'm trying to read out the values with pgm_read_dword(sprites + (submode * 256 + row * 16 + column) * sizeof(uint32_t)) , but am getting turned around and confused about how the address math works. In this, submode maps to the matrix index. submode , row , and column are all declared as uint8_t , in case it helps at all.

How do I correctly calculate the address for pgm_read_dword ?

Is pgm_read_dword even how I want to try to read out uint32_t values? I'm immediately passing the output to a method that expects that type.

Answer 1

根据评论中的 datafiddler，它就像调用pgm_read_dword(&sprites[submode][row][column])并让编译器处理偏移计算一样简单。