Hi,
I have implemented a DFU over CAN, where the bootloader checks, if the application header is correct (a key) or not. To start a DFU, the application should modify the header to 0x0000, such that
the bootloader notice, that the firmware needs to be updated. I implemented a small program to test, if I can overwrite some flash data by using the Fapi_issueProgrammingCommand(), but the overwrite process always fails with a 0x48 error:
/////////////////////////////////////////////////////////////////////////////////////////////////////Reset Flash header
//Init flash first:
initFlashSectors();
EALLOW;
uint16_t miniBuffer1[4] = {0x0000};
uint16_t miniBuffer2[4] = {0x0000};
miniBuffer1[0] = 0x46ab;
miniBuffer1[1] = 0x17c4;
miniBuffer1[2] = 0x1289;
miniBuffer1[3] = 0x3ffe;
//////////////////////////////////////////////////////////////////////////////////////////////////////Write first to flash header
Fapi_issueProgrammingCommand((uint32_t *) 0x0008F000, miniBuffer1,
sizeof(miniBuffer1), 0, 0, Fapi_AutoEccGeneration);
while (Fapi_checkFsmForReady() != Fapi_Status_FsmReady){};
Fapi_FlashStatusType oFlashStatus = Fapi_getFsmStatus();
//////////////////////////////////////////////////////////////////////////////////////////////////////Write to zero now
Fapi_issueProgrammingCommand((uint32_t *) 0x0008F000, miniBuffer2,
sizeof(miniBuffer2), 0, 0, Fapi_AutoEccGeneration);
while (Fapi_checkFsmForReady() != Fapi_Status_FsmReady){};
oFlashStatus = Fapi_getFsmStatus();
EDIS;
/////////////////////////////////////////////////////////////////////////////////////////////////////Reset Flash header
if(oFlashStatus) //Error occured
{
while(1)
{
//
// Delay
//
GPIO_togglePin(34);
DEVICE_DELAY_US(1e5);
// GPIO_togglePin(31);
}
}
else
{
while(1) //No error occured
{
//
// Delay
//
GPIO_togglePin(31);
DEVICE_DELAY_US(1e6);
// GPIO_togglePin(31);
}
}
How can the data at a specific flash area be modified (of course with 0x0000, otherwise it will not work), without erasing the sector?
