a LPC81x ISP problem

[torukoyama]

I'm in trouble with ISP of LPC812.

A command of ISP, "Read <address> <number of byte>" seems to be wired when I read an address, 0x3808, which is the middle of page 224. there is no problem when I read 0x3800, 0x3804 and 0x380C. ISP returns the correct data via UART. But only reading the address of 0x3808, the return data is 0x00000000. Whenever read data, I designate <number of byte> as 4. and keep word boundary.

Is there a bug?

Here below are information of microprocessor I have.

ProductName: LPC812M101JDH20

[kerryzhou]

Hi torukoyama,

   Please check my test result with lpc812max board.

1. Use the flash magic read out the 0x3800 address data:

All the data in 0X3800,0X3804,0X3808,0X380C is 0xffffffff.

Please check my ISP mode command:

0X52 0X20 0X31 0X34 0X33 0X34 0X34 0X0D 0X0A 0X30 0X0D 0X0A 0XFF 0XFF 0XFF 0XFF

It is:R 0 14344<cr><lf>0<cr><lf> 0xffffffff

14344: 0x3800

0:CMD_SUCCESS

0xffffffff: actuall data plain binary

You can find, 14344 is address 0x3808, the read out data is 0xffffffff, the same as the result from the flashmagic.

My chip is also LPC812M101JDH20.The revision identifier is 4C.

Wish it helps you!

Have a great day,
Kerry

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[kerryzhou]

Hi torukoyama,

     Thank you for your interest in NXP LPC product, I would like to provide service for you.

     I need more information about your question.

     1. Please also provide me your LPC812M101JDH20 marking

  2. Please use the flash magic to read out the memory which contains 0X3800-0X38FF.

  3. Please give me the whole ISP command which you are using to connect the LPC812, and read the 0x3800, 0x3804, 0x3808 and 0x380C, you can give me the screen shoot from our serial tool.

Thanks a lot for your cooperation, then I will do the detail check on my side.

Waiting for your reply!

Have a great day,
Kerry

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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