topic Re: Reinvoke ISP issue on a LPC802? in LPC Microcontrollers

Reinvoke ISP issue on a LPC802?

t123456 — Wed, 01 Jul 2020 03:36:28 GMT

Does anyone have an example of implementing the reinvoke_isp on a LPC802?
Also what is meant by this line in the manual "If using USART ISP mode, enable the clocks to the default before calling this command."? Are the clocks in default after a power reset?

int main(void)
{
command[0] = (uint32_t) 57;
command[1] = 1;
iap_entry(command, result);
return 0;
}

I know the hardware is correct because when I reset without any code loaded or reset and pull the ISP pin low I enter the Autobaud detection routine.
However, when I try to enter through software it goes to address 0x0F0003B6 and hangs. If I change the Type to anything other than one the iap_entry returns with an error.

I have tried setting the clocks in all sorts of ways without any luck.

Re: Reinvoke ISP issue on a LPC802?

Alice_Yang — Thu, 02 Jul 2020 05:36:58 GMT

Hello Tad Masek,

You can refer to the code about Chip_IAP_ReinvokeISP() in below thread:

How to reinvoke bootloader in LPC824 with iap command?

Regards,

Alice

Re: Reinvoke ISP issue on a LPC802?

t123456 — Thu, 02 Jul 2020 17:25:32 GMT

Hi Alice,

Thank you for the reply. I actually tried that code early on in my testing. Here is the output:

Part ID is: 00008023
Unique Part ID is:0x20480C028055AE63012614110A14F5000D03
Enter UART ISP mode

This code stops at the same location in memory as mine did.

PC = 0F00025A, CycleCnt = 00000000
R0 = 00000000, R1 = 00000001, R2 = 000000FF, R3 = 00000000
R4 = 00000001, R5 = 00000000, R6 = 00000001, R7 = 10000738
R8 = FFFFFFFF, R9 = FFFFFFFF, R10= 0FFF07E0, R11= 00000000
R12= 00000015
SP(R13)= 10000338, MSP= 100006C8, PSP= 10000338, R14(LR) = 0F0003BD
XPSR = 61000000: APSR = nZCvq, EPSR = 01000000, IPSR = 000 (NoException)
CFBP = 02000001, CONTROL = 02, FAULTMASK = 00, BASEPRI = 00, PRIMASK = 01
FPU regs: FPU not enabled / not implemented on connected CPU.

So calling Reinvoke ISP seems to be working. If I give it any other type than 1 (serial) it will exit. However it just hangs. This only happen when entering ISP through software. It would fine if I enter using the ISP pin. This makes me wonder if its a clock setup issue or something but i cant find any details on how to setup to call reinvoke isp other than "If using USART ISP mode, enable the clocks to the default before calling this command."

Re: Reinvoke ISP issue on a LPC802?

Alice_Yang — Mon, 06 Jul 2020 10:50:29 GMT

Hello Tad,

You can use Flash Magic test whether enter ISP mode, refer to this thread:

https://community.nxp.com/message/1104337

Regards,

Alice

Re: Reinvoke ISP issue on a LPC802?

t123456 — Wed, 08 Jul 2020 15:28:34 GMT

Hi Alice,

Thank you for this link but testing if I entered it has not been a issue? ISP works find when I enter through hardware. The micro controller just hangs when I enter ISP through software.

Well I am making the assumption that when entering ISP through software it will enter at the autobaud routine so I need to send the ? until I get the "Synchronize" in return. Is this correct? I have tried initializing the UART before calling reinvoke isp but that didnt make a difference.

Tad

Re: Reinvoke ISP issue on a LPC802?

Alice_Yang — Fri, 10 Jul 2020 04:10:24 GMT

Hello Tad,

After enter ISP mode use software API, You can also refer to my video in that thread to check whether

successfully entered ISP,

Open flash magic, "- Using Flash Magic -> ISP ->Read Device Signature .".

Regards,

Alice

Re: Reinvoke ISP issue on a LPC802?

koenvda — Tue, 06 Dec 2022 15:56:25 GMT

Hi Tad,

I'm facing the same issue. Did you ever found the solution?

Thanks!

Re: Reinvoke ISP issue on a LPC802?

jrevans — Mon, 05 Jun 2023 15:32:27 GMT

I just thought I'd mention that I was experiencing the same problem, but we found a solution. The thread is here: https://community.nxp.com/t5/LPC-Microcontrollers/LPC802-Reinvoke-ISP-not-working-with-LPCXpresso802-OM40000-Rev-A/m-p/1657934

Summary:

Remove calls to __disable_irq(); from my code before I call the library's IAP_ReinvokeISP() function. Additionally, modify the library's iap_entry() function to remove the call to __disable_irq(); from there also!