Forums:
I'd be eternally grateful if someone could help me out here. I am trying to write bootable application metadata directly to flash for an SD card based bootloader. The system has ECC disabled and uses a CY8C5888LTQ-LP097 (one of the USB stick parts). Whatever I seem to do with flash is failing.
Comments on the code are in-line. First is a snippet showing how writing metadata is tested, then the code for flashing the metadata structure itself.
TAIA
Jerry.
// structure to manage metadata as per http://www.cypress.com/file/44531/download P21
PSOC5_Metadata metadata;
// fill with checkbyte
memset(&metadata,0xEE,sizeof(PSOC5_Metadata));
// first get existing metadata. this works, we get valid numbers.
uint32 length = Bootloader_GetMetadata(Bootloader_GET_BTLDB_LENGTH,0);
uint32 checksum = Bootloader_GetMetadata(Bootloader_GET_BTLDB_CHECKSUM,0);
// update using our own API
metadata.ActiveApplication = 1;
metadata.AppCheckSum = checksum;
metadata.AppLength = length;
metadata.AppAddress = Bootloader_GetMetadata(Bootloader_GET_BTLDB_ADDR,0);
// status returns CYRET_SUCCESS
status = UpdateMetadata(0,&metadata);
// and check again. these values now come back as zero (!)
length = Bootloader_GetMetadata(Bootloader_GET_BTLDB_LENGTH,0);
checksum = Bootloader_GetMetadata(Bootloader_GET_BTLDB_CHECKSUM,0);
// this (predictably) fails
status = Bootloader_ValidateBootloadable(0);
// full row buffer
uint8 metaBuf[CYDEV_FLS_ROW_SIZE];
cystatus UpdateMetadata(int appId,PSOC5_Metadata* metadata)
{
PSOC5_Metadata* pc = 0;
cystatus status = CySetTemp();
if (status != CYRET_SUCCESS)
{
return status;
}
//
size_t bytes = sizeof(PSOC5_Metadata);
// clear buffer
memset(&metaBuf[0],0,CYDEV_FLS_ROW_SIZE);
// copy in metadata
memcpy(&metaBuf[0],metadata,bytes);
// choose which row to update
uint16 row = Bootloader_MD_ROW_NUM(appId);
// Update metadata in flash
status = CyWriteRowData(Bootloader_MD_FLASH_ARRAY_NUM, row, metaBuf);
//
CyFlushCache();
// sanity check ...
pc = (PSOC5_Metadata*) &metaBuf[0];
//
return status;
}
