On Tue, May 16, 2017 at 05:11:36PM -0700, Jacob Rosenthal wrote: > Seems like it could go in flash_map? > > Its also been requested to also have a function that detects if an area > should be erased, based on it having any non 0xff bytes within. > > Should that go there as well.
That is the same thing, isn't it? > Whats a good method to loop through all bytes of a flash area? Perhaps something like the following: 1. Allocate a buffer that is properly aligned to be accessed by an unsigned int*. It may take some testing to determine a good size that balances speed and size efficiency; I would start with 64 bytes. I would also start by putting this buffer on the stack. 2. Read a chunk of flash into the buffer (min(size-of-buffer, num-unread-bytes). 3. Use an unsigned int* to iterate through the buffer. If the pointer points to something other than (unsigned int)-1, then the flash is not erased. 4. If there are any remaining bytes (i.e., number of bytes read is not a multiple of sizeof(unsigned int)), compare them individually against 0xff using a uint8_t*. Chris
