esp8266/modesp: flash_write(): Writes in multiples of 4 bytes.

Author: pfalcon

esp8266/modesp.c

@@ -553,6 +553,9 @@ STATIC mp_obj_t esp_flash_write(mp_obj_t offset_in, const mp_obj_t buf_in) {
  mp_int_t offset = mp_obj_get_int(offset_in);
  mp_buffer_info_t bufinfo;
  mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
+ if (bufinfo.len & 0x3) {
+ nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "len must be multiple of 4"));
+ }
  SpiFlashOpResult res = spi_flash_write(offset, bufinfo.buf, bufinfo.len);
  if (res == SPI_FLASH_RESULT_OK) {
  return mp_const_none;