Main: make it clear that this is a const structure

main_fw/src/i2c_impl.c

@@ -117,7 +117,7 @@ static const int8_t cmd_data_lengths[] = {
 // only block write-block read process calls modify the length
 static int8_t cmd_data_length_query = -1;
 
-static cmd_t cmds_cmds[] = (cmd_t[]){
+static const cmd_t cmds_cmds[] = (cmd_t[]){
         {0x00, (int8_t *)&cmd_data_lengths[0], (uint8_t *)&page_tmp,     (fp_t)NULL, &page_chk,  (fp_t)NULL, QUERY_WR | QUERY_RD | QUERY_FMT_8B, 0},
         {0x1A, (int8_t *)&cmd_data_length_query, (uint8_t *)&query_r,  (fp_t)NULL, &query_prp, (fp_t)NULL, QUERY_SUP, 1},
         {0x78, (int8_t *)&cmd_data_lengths[2], (uint8_t *)&status_b, (fp_t)NULL, (fp_t)NULL, &read_status_b, QUERY_RD, 0},