LPC Microcontrollers中的主题 Re: Bytes to upload for reprogramming flash with a custom bootloader

Bytes to upload for reprogramming flash with a custom bootloader

greta_sasso — Wed, 21 Aug 2019 16:49:29 GMT

Hi everyone,

I am writing one secondary bootloader for lpc11u6x and i can't find any documentation that can help me..

I am trying to write an "hello world bootloader" wich is located at 0x0 address. this app will erase and prepare sectors and it will copied one array containing the new firmware ( in hex) to the flash, from address 0x00003000.

With "Chip_IAP_CopyRamToFlash(APP_VECTOR_TABLE, bin , size);" i continue obtained error 6 ( COUNT_ERROR Byte count is not multiple of 4 or is not a permitted value ) ..

I don't understand from with kind of file I have to take the bytes for the new application.

I am currently using the .bin file generated from the lpcxpresso ide with the post-build-step, including checksum...

thanks a lot..

Re: Bytes to upload for reprogramming flash with a custom bootloader

ZhangJennie — Thu, 22 Aug 2019 01:49:01 GMT

HI Greta Sasso

I suggest you refer AN12037: LPC11U6x USB DFU Secondary Bootloader

https://www.nxp.com/docs/en/application-note/AN12037_LPC11U6x.zip

Have a great day,
Jun Zhang

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Re: Bytes to upload for reprogramming flash with a custom bootloader

greta_sasso — Thu, 22 Aug 2019 15:26:06 GMT

Thanks a lot

I saw the source code for some inspiration.. but I can't solve my doubts..

I have my app running from 0x00 addres, and it's the secondary bootloader.

I want to save directly one bin image ( saved into one array ) into flash at address 0x3000. So have write the bin hex ( saved directly into code in one array ) into the necessary sectors of flash, with success.

After that, i have tried to jump to the 0x3004 address, reloading vector table address to 0x3000 ( i have enable this function with cortex m0+).

But i have stiil problems with interrupts.. i obtained : <signal handler called>() at 0xfffffff9 ( SIGINT interurpt) and no handler was called...

I don't know if I am wrong with the bin hex file saved into flash.. or with the interrupt vector table manaement..

--- I have generate the .bin file from my second application "blink" without checksum ( i don't wont check in this moment), using lpcxpresso ide. I have take bytes from 0x00 to 0x2000 ( app'size = 6KB) and copied into one uint32_t array in the bootloader that i want to persist in flash ad address 0x000

--- I tried two different ways for interrupt vector table...

1) this will generate the interrupt after jump_to_app()

cleanBoot();

SCB->VTOR = stackPointer;

unsigned * p = (unsigned *) (applicationAddress + 4);

void (*jump_to_app)(void);

jump_to_app = (void *) *p;

jump_to_app();

2) with common_handler in cr_startup....c and the redirect common_handler function. this will generate the interrupt when enter in common_handler, after jump2app();

cleanBoot();
Chip_PMU_WriteGPREG(LPC_PMU, 3, APP_VECTOR_TABLE);
__set_MSP(*(volatile uint32_t*) (APP_VECTOR_TABLE));
__set_PSP(*(volatile uint32_t*) (APP_VECTOR_TABLE));
jump2app = (iapfun) *(uint32_t*) (APP_VECTOR_TABLE + 4);

jump2app();

void Common_Handler(void)
{
typedef void (*pFunction)(void);

pFunction Jump_To_Application;
volatile uint32_t JumpAddress;
volatile uint32_t i;
i = __get_IPSR();
JumpAddress = *(__IO uint32_t *)(Chip_PMU_ReadGPREG(LPC_PMU, 3) + (4 * i));
Jump_To_Application = (pFunction) JumpAddress;
Jump_To_Application();
}

Re: Bytes to upload for reprogramming flash with a custom bootloader

ZhangJennie — Tue, 27 Aug 2019 08:04:04 GMT

I would suggest you refer this article I ever wrote

https://community.nxp.com/docs/DOC-103961

It's for Kinetis but the jumping to bootloader method is exactly the same as LPC.

Have a nice day,

Jun Zhang