status_code_t nvm_read(mem_type_t mem, uint32_t address, void *buffer,
uint32_t len)
{
switch (mem) {
case INT_FLASH:
nvm_flash_read_buffer((flash_addr_t)address, buffer,
(uint16_t)len);
break;
case INT_USERPAGE:
nvm_user_sig_read_buffer((flash_addr_t)address, buffer,
(uint16_t)len);
break;
case INT_EEPROM:
nvm_eeprom_read_buffer((eeprom_addr_t)address, buffer,
(uint16_t)len);
break;
#if defined(USE_EXTMEM) && defined(CONF_BOARD_AT45DBX)
case AT45DBX:
{
uint32_t sector = address / AT45DBX_SECTOR_SIZE;
if (!at45dbx_read_sector_open(sector)) {
return ERR_BAD_ADDRESS;
}
at45dbx_read_sector_to_ram(buffer);
at45dbx_read_close();
}
break;
#endif
default:
return ERR_INVALID_ARG;
}
return STATUS_OK;
}
/**
* \brief Example 2 main application routine
*/
int main(void)
{
uint8_t flashbuf[8];
uint32_t checksum1;
uint32_t checksum2;
board_init();
sysclk_init();
gfx_mono_init();
// Calculate checksum for an address range in flash.
checksum1 = crc_flash_checksum(CRC_FLASH_RANGE, FLASHADDR, 4);
// Read out the buffer from flash
nvm_flash_read_buffer(FLASHADDR, flashbuf, 4);
// Calculate checksum for the buffer from flash
checksum2 = crc_io_checksum(flashbuf, 4, CRC_32BIT);
// Make sure the calculated checksums are equal and write to screen
if (checksum1 == checksum2) {
gfx_mono_draw_string("Address range CRC OK",
0, 0, &sysfont);
}
// Append the flash checksum and recalculate
crc32_append_value(checksum1, flashbuf+4);
checksum1 = crc_io_checksum(flashbuf, 8, CRC_32BIT);
// Make sure the checksum is zero and write to screen
if (checksum1 == 0) {
gfx_mono_draw_string("IO CRC zero OK", 0,
SYSFONT_HEIGHT + 1, &sysfont);
}
// Calculate checksum for the boot section
checksum1 = crc_flash_checksum(CRC_BOOT, 0, 0);
// Recalculate checksum for the boot section using flash range CRC
checksum2 = crc_flash_checksum(CRC_FLASH_RANGE, BOOT_SECTION_START,
BOOT_SECTION_END-BOOT_SECTION_START+1);
// Make sure the checksums are equal and write to screen
if (checksum1 == checksum2) {
gfx_mono_draw_string("Boot section CRC OK",
0, (SYSFONT_HEIGHT + 1)*2, &sysfont);
}
// Calculate checksum for the application section
checksum1 = crc_flash_checksum(CRC_APP, 0, 0);
// Recalculate checksum for the application section using flash range CRC
checksum2 = crc_flash_checksum(CRC_FLASH_RANGE, APP_SECTION_START,
APP_SECTION_END-APP_SECTION_START+1);
// Make sure the checksums are equal and write to screen
if (checksum1 == checksum2) {
gfx_mono_draw_string("App section CRC OK",
0, (SYSFONT_HEIGHT + 1)*3, &sysfont);
}
// End of application, loop forever
while (true) {
// Intentionally left empty
}
}
/**
* \brief Copy a flash memory section to a RAM buffer
*
* \param dst Pointer to data destination.
* \param src Pointer to source flash.
* \param nbytes Number of bytes to transfer.
*/
static void mem_flash_read(void *dst, isp_addr_t src, uint16_t nbytes)
{
nvm_flash_read_buffer(src, dst, nbytes);
}
