STM8L150G4 - clearing ROP option

[lwojdziak]

Hello,

I have problem with clearing ROP (Read-Out Ptotection) byte in STM8L150. I have device with protected bytes set. I trying to set this byte to 0xAA, then reset the device and again set ROP to 0xAA - according ST PM0054, p.5.2. After this procedure ROP is still equal 0x00 and writing is disabled.

I checked that I can freely modify bytes 0x4801 - 0x480C. I can't modify only 0x4800.

BR

[spth]

What's STM8L150G4? An STM8 variant no longer or not yet available? Google finds only this ticket.

Philipp

[lwojdziak]

Sorry, my fault. Of course this is STM8L151G4U6.

[veinmichal]

Hello, Has anyone solved this issue? According to ST Programming manual: "To unprotect the device, the ROP must be written twice: the first write, with any value, launches a global erase which includes the option byte; the second write, 0xAA, unprotects the device, and then the 0xAA value remains in the ROP byte. Please note the EOP should be checked each time. "

However launching the procedure twice doesn't make it even though it says 'Writing binary file 1 bytes at 0x4800... OK'.

[spth]

The branch by cpldcpu could have a solution.

Philipp

[lkord]

Issue still unsolved on stm8l151g6. I manged to unlock rop with openocd but stm8flash still can not do this.

[lkord]

Today I tried writing 13B: AA 00 00 ..... inside-u(nlock) parameter implemented: write 0xAA read eop -> 0x14 (EOP bit is 1) write 0xAA I put it in UNLOCK action after in block of if (part->read_out_protection_mode == ROP_STM8L){}

if (part->read_out_protection_mode == ROP_STM8L) {
		fprintf(stderr, "ROP_STM8L\n");
		
		int bytes_count_align = ((bytes_count-1)/256+1)*256; // Reading should be done in blocks of 256 bytes
		unsigned char *bufr = malloc(bytes_count_align);
		if(!bufr) spawn_error("malloc failed");
		
		
		for (int i=0; i<bytes_to_write;i++) {
			buf[i]=0xAA;
			if (i>0) buf[i]=0x00;
			fprintf(stderr, "%x ", buf[i]);
		}
		/* flashing MCU */
		sent = pgm->write_range(pgm, part, buf, start, bytes_to_write, memtype);
		
		int recv = pgm->read_range(pgm, part, bufr, 0x5054, bytes_count_align);
		for(int b=0; i<sizeof(bufr);i++){
			fprintf(stderr, "\nBytes read:");
			fprintf(stderr, "%x ", bufr[i]);
		}
					
		if(recv < bytes_count_align) {
			fprintf(stderr, "\r\nRequested %d bytes but received only %d.\r\n", bytes_count_align, recv);
			spawn_error("Failed to read MCU");
		}
		
		sent = pgm->write_range(pgm, part, buf, start, bytes_to_write, memtype);
	}

but thi still doesnot work.

[lkord]

for future questions: https://github.com/vdudouyt/stm8flash/pull/98 Issue Solved.