what is the meaning difference between security byte define ?

tigerlo — Tue, 26 Sep 2017 22:44:07 GMT

What is the difference between if security protect byte FSEC set to 0xFF & 0xFD ?
//FSEC EQU 0xFE ; no security in flash

//FSEC EQU 0xFF ; security protect
FSEC EQU 0xFD ; security protect

When I set FSEC to 0xFD , my program execution have something difference with 0xFE(No security)when FSEC setting to 0xFD, the program can't execute correct ? I am very confusing ?

#define FLASH_TEMPERATURE_DELTA_ADDR 0x7C00

FlashAddr=(uint8_t *) FLASH_TEMPERATURE_DELTA_ADDR;
FlashHeader=*FlashAddr;
#if defined (DEBUG_SYATEM_STARTUP)
PRINTF("\r\n FlashHeader = %x , FlashAddr = %x\r\n",FlashHeader,FlashAddr);
#endif
if(FlashHeader!=FLUSHBUFFER_HEADER)
{
GPIO_DRV_ClearPinOutput(kGpioRedLED);
OSA_TimeDelay(2500);
GPIO_DRV_SetPinOutput(kGpioRedLED);
} else {
LED_toggle_red_led(1);
}

The above program can't be executed correctly, I only read 0x7c00 data & light LED , it is very simple.

Re: what is the meaning difference between security byte define ?

jorge_a_vazquez — Fri, 29 Sep 2017 01:20:32 GMT

Hi Tiger Lo

0xFF and 0xFD in FSEC field represent the same MCU secured state.

Hope this information could help you.
Best Regards

Jorge Alcala

topic what is the meaning difference between security byte define ? in Kinetis Software Development Kit

what is the meaning difference between security byte define ?

Re: what is the meaning difference between security byte define ?