LPCXpresso845-MAX board boot reset and pull down ISP(PIO0_12) pin, always press ISP KEY, MCU will into ISP mode，and then use nxp's Flash Magic tools for lpc845 MCU reprogramming.
I read FAIM word 0 and found that there was no problem, I also tried using CRT to send the 0x3f command to LPC845 in ISP mode, but still didn't get a reply from mcu. the mcu running is SDK's example code.
In the same way, I've successfully programmed on the LPC824 life development board, but LPCXpresso845-MAX board just can't program in ISP mode, I don't know why?
Hello xiangchang mo,
I was able to reproduce the behavior that you mentioned. I found that the problem was with the default values of the FAIM. For this I used the example FAIM_and_Clocks from the code bundle and the user manual Table 5 and Table 6 from the chapter 4. In these tables you can see that to use USART0 as the interface for ISP bits 30 and 31 from the word 0 of the FAIM should be 0. The value from the word 1 should be 0x1918 to use P0_24 UART_RX and P0_25 UART_TX.
When I use the example of the code bundle mentioned before I found the following.
So, as you can see the value of the word 1 from the FAIM was not correct. Once I programmed the correct value (you can do this using the same example, follow the instructions of image) I entered to ISP mode correctly. In my case the value of the word 0 was correct, however I recommend you to check also this word and if it's incorrect you will need to program this word of the FAIM too.
Link to download the Code Bundle.
Hope it helps!
Victor.
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