Writing to LPC54628 EEPROM through J-Link

Leo11 — Wed, 09 Feb 2022 14:33:33 GMT

Hi,

I am trying to write to EEPROM without involvement of CPU, as it provides a convenient way of preparing devices. I am erasing the flash memory and trying to write to the EEPROM via a J-Link.

I have tried different scenarios to understand what the problem can be. First of all, I can successfully write to EEPROM from the CPU (i.e. when using the SDK). I can also write to the EEPROM by J-Link when I keep the clock and power configurations that CPU sets. However, I am not able to write to the EEPROM when I attempt to erase and reset the CPU and do all the required power/clock configurations through J-Link. I was wondering if anyone can point what configuration I am missing.

Here is a pseudocode showing how I communicate to J-Link to configure the device and write to the EEPROM. In the last line, the bit never gets set indicating an unsuccessful write to the EEPROM (or probably the fact that something has not been configured properly). Can you check whether I am doing the configuration correctly?

ADDRESS_AHBCLKCTRL0 = 0x40000200 ADDRESS_MAINCLKSELA = 0x40000280 ADDRESS_MAINCLKSELB = 0x40000284 ADDRESS_SYSPLLCLKSEL = 0x40000290 ADDRESS_AHBCLKDIV = 0x40000380 ADDRESS_SYSPLLCTRL = 0x40000580 ADDRESS_SYSPLLNDEC = 0x40000588 ADDRESS_SYSPLLPDEC = 0x4000058C ADDRESS_PDRUNCFG0 = 0x40000610 ADDRESS_PDRUNCFGCLR0 = 0x40000630 ADDRESS_PRESETCTRL0 = 0x40000100 ADDRESS_PRESETCTRLSET0 = 0x40000120 ADDRESS_PRESETCTRLCLR0 = 0x40000140 ADDRESS_CMD = 0x40014000 ADDRESS_RWSTATE = 0x40014008 ADDRESS_WSTATE = 0x40014010 ADDRESS_CLKDIV = 0x40014014 ADDRESS_INTSTAT = 0x40014FE0 ADDRESS_INTSTATCLR = 0x40014FE8 ADDRESS_EEPROM_BASE = 0x40108000 # Clock configurations for main_clk # Select Free running oscillator (FRO) 12 MHz for main clock source write_word(ADDRESS_PDRUNCFGCLR0, 1 << 4) # Ensure FRO is running write_word(ADDRESS_MAINCLKSELA, 0) write_word(ADDRESS_MAINCLKSELB, 0) # System clock and AHB clock control register ahbclkctrl0 = read_word(ADDRESS_AHBCLKCTRL0) write_word(ADDRESS_AHBCLKCTRL0, ahbclkctrl0 | (1 << 9)) # Enable EEPROM # Set EEPROM peripheral reset write_word(ADDRESS_PRESETCTRLSET0, (1 << 9)) # Reset --> Wait until bit 9 in ADDRESS_PRESETCTRL0 is set write_word(ADDRESS_PRESETCTRLCLR0, (1 << 9)) # Clear the reset --> Wait until bit 9 in ADDRESS_PRESETCTRL0 is cleared # Set EEPROM clock write_word(ADDRESS_CLKDIV, 3) # Set the wait states for read and write write_word(ADDRESS_RWSTATE, 0x00000A0A) write_word(ADDRESS_WSTATE, 0x000A0A0A) # Write write_word(ADDRESS_INTSTATCLR, 1 << 2) # Clear program operation finished interrupt status eeprom_address = ADDRESS_EEPROM_BASE write_word(eeprom_address, b"\x01") write_word(ADDRESS_CMD, 0x00000110) # Trigger an erase/program operation --> Wait until bit 2 in ADDRESS_INTSTAT is set

Re: Writing to LPC54628 EEPROM through J-Link

Alice_Yang — Wed, 09 Feb 2022 09:07:42 GMT

Hello Leo11,

About this question, I think you can ask from Segger, the support team know this well.

https://www.segger.com/

Alice

Re: Writing to LPC54628 EEPROM through J-Link

Leo11 — Wed, 09 Feb 2022 14:28:11 GMT

Thanks for your reply!

I don't believe the problem is related to J-Link. It is about configuring the MCU for writing to EEPROM without using the SDK. I have simplified the code sample in my original question to make easier to read. My guess is that there is a configuration step I am missing and for that reason my write to the EEPROM address range and triggering a write/erase operation through register `0x40014000` do not result in the data being written to the EEPROM. Can you please confirm whether I am doing the initial configuration correctly?

Re: Writing to LPC54628 EEPROM through J-Link

Alice_Yang — Tue, 15 Feb 2022 08:52:25 GMT

Hello Leo,

Sorry I'm not very understand the J-link command well. If you have question about the using SDK driver write EEPROM, or some detail EEPROM issue , I think I can help you.

Alice

LPC MicrocontrollersのトピックWriting to LPC54628 EEPROM through J-Link

Writing to LPC54628 EEPROM through J-Link

Re: Writing to LPC54628 EEPROM through J-Link

Re: Writing to LPC54628 EEPROM through J-Link

Re: Writing to LPC54628 EEPROM through J-Link