topic Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759 in LPC Microcontrollers

How to enter into ISP mode through 'reinvoke ISP' in LPC1759

keerthana_r — Wed, 06 Feb 2019 09:25:33 GMT

In LPC1759, I entered ISP through "reinvoke ISP" with the following steps

Disable PLL
Reset timer 1
Re-map interrupt vectors
Set watch dog timeout
Reinvoke ISP

After entering into ISP, What exactly happens in the controller? How to check if it is in ISP Mode? After entering ISP, How to get out?

void init(void){ Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT); Chip_TIMER_Reset(LPC_TIMER1); Chip_SYSCTL_Map(REMAP_BOOT_LOADER_MODE); }
int main(void) { uint32_t wdtFreq; wdtFreq = Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_WDT) / 4; init(); Chip_WWDT_Init(LPC_WWDT); Chip_WWDT_SetTimeOut(LPC_WWDT, wdtFreq / 10); Chip_IAP_ReinvokeISP(); DEBUGSTR("HELLO\n\r"); return 0; }

Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

jeremyzhou — Mon, 11 Feb 2019 01:45:17 GMT

Hi Keerthana R,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Actually, you can use the Flash Magic to connect the LPC1759 chip to confirm whether it enters the ISP mode or not.

Flash Magic - Welcome

Have a great day,
TIC

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Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

keerthana_r — Mon, 11 Feb 2019 05:00:44 GMT

Hi jeremyzhou,

Thank you for the information, it is sufficient to know the device is in ISP mode or not but for the device to send ISP commands and to flash the device i.e, to upgrade the new firmware, do we need secondary boot loader for ISP mode?

Have a great day,

Thank you

Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

jeremyzhou — Tue, 12 Feb 2019 00:54:01 GMT

Hi Keerthana R,

Thanks for your reply.
1) Do we need secondary boot loader for ISP mode?
-- No.
Hope it helps.

Have a great day,
TIC

Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

keerthana_r — Tue, 12 Feb 2019 05:58:28 GMT

Hi jeremyzhou,

What if we don't use flash magic(PC) for ISP, So can we trigger ISP with only a single controller?

Have a great day,

Thank you

Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

jeremyzhou — Tue, 12 Feb 2019 08:18:52 GMT

Hi Keerthana R,

Thanks for your reply.
1) What if we don't use flash magic(PC) for ISP, So can we trigger ISP with only a single controller?
-- No, you can't.
Hope it helps.

Have a great day,
TIC

Re: How to enter into ISP mode through 'reinvoke ISP' in LPC1759

keerthana_r — Tue, 12 Feb 2019 08:57:55 GMT

Thank you :smileyhappy: