need clarification of pstorage

RE: need clarification of pstorage

Hung Bui — Fri, 12 May 2017 10:37:12 GMT

@satheesh: Please read the documentation. It clearly stated that the size provided as input for the function is: "Number of 32-bit words to write. Maximum size is 256 32bit words for nRF51 and 1024 for nRF52."

So if you provide 50 that mean it's 50 words = 200 bytes

RE: need clarification of pstorage

emdi — Thu, 11 May 2017 09:39:57 GMT

The parameter to sd_flash_write() is expressed in number of 4 byte words. The paramter 'size' is divided by the size of a word because it is expressed in bytes.

RE: need clarification of pstorage

Satheeshkumar — Thu, 11 May 2017 09:37:03 GMT

uint32_t range is 4 byte. i need to know why "size / sizeof(uint32_t)" it need in the write function. if i gave 50 means. the will write 50 byte data into the memory right? then why need to divide?

RE: need clarification of pstorage

Moritz — Thu, 11 May 2017 09:36:02 GMT

As for the size i think this is because size has to be: Number of 32-bit words to write. Maximum size is 256 32-bit words for nRF51 and 1024 for nRF52. infocenter.nordicsemi.com/.../group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html

You get this number by dividing the size by the size of an uint32_t (32bit)