LPC microcontrollers NXP's but internal organs the bootloader,
Because there is that difficult to use as described below,
I created a Tiny bootloader.
Please try a person of interest.
①TX(RX) port to be used for the boot loader is fixed.
②To enter the bootloader mode, it is necessary to ground during reset pins of interest.
Size of the prototype bootloader 256 +8 bytes（128+4 words/thumb）
At the exit of the bootloader, there is a bug in place to restore the value of the switch matrix, I was corrected.
It will be thorough and complete processing of the exit of the boot loader,
I have to return the value of the reset at the exit, the value of the register that is used by the bootloader.
Hi I like what you have done here. I wrote a version in C "just for fun", it's about 40% bigger then your assembler version.
One question, should the user app (e.g. blinky) have the bootloader entry point in its vector table for the reset vector? Otherwise, I can't see how the bootloader is entered after the user app has been programmed.
Cheers
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Hi,all
LPC microcontrollers NXP's but internal organs the bootloader,
Because there is that difficult to use as described below,
I created a Tiny bootloader.
Please try a person of interest.
①TX(RX) port to be used for the boot loader is fixed.
②To enter the bootloader mode, it is necessary to ground during reset pins of interest.
Size of the prototype bootloader 256 +8 bytes（128+4 words/thumb）
flash map:(0x00000000:0x00001000)
0000:0003 Stack pointer
0004:0007 Reset vector
0008:001B IRQ vector
001C:001F CheckSum 0000:001B
0020:00BF IRQ vector
00C0:0EF7 User Program
0EF8:0EFF User Program jump vector
0F00:0FFF Bootloader
Ram map:(0x10000000:0x10000400)
0000:003F bootloader buffer 64bytes
0040:005F IAP table
0060:03FF RAM/STACK/IAP
piccodes.ini
; NXP LPC family
;
;-----------
$31, 3, LPC 810, $1000, 0, 264, 64,
Last edit: Dan 2014-03-22
Hi,all
I have updated the bootloader LPC810.
At the exit of the bootloader, there is a bug in place to restore the value of the switch matrix, I was corrected.
It will be thorough and complete processing of the exit of the boot loader,
I have to return the value of the reset at the exit, the value of the register that is used by the bootloader.
code size reduction.
Hi I like what you have done here. I wrote a version in C "just for fun", it's about 40% bigger then your assembler version.
One question, should the user app (e.g. blinky) have the bootloader entry point in its vector table for the reset vector? Otherwise, I can't see how the bootloader is entered after the user app has been programmed.
Cheers
Hi Bob
Since the bootloader automatically rewrites the reset vector,
Please make C application normally.
Please set the size to 0x00000EF7 or less.
Attach a sample that can be read by the bootloader.
(1) LED flashing program
... \ LPCXpresso_6.X.X_XXX \ workspace \ Blinky \ Release \ Blinky.hex
(2) Key input Echo program
... \ LPCXpresso_6.X.X_XXX \ workspace \ STEST \ Release \ echo.hex
(3) LPC 810 Flash memory dump
... \ LPCXpresso_6.X.X_XXX \ workspace \ STEST \ Release \ flash_dump.hex
(4) LPC 810 RAM memory dump
... \ LPCXpresso_6.X.X_X_XXX \ workspace \ STEST \ Release \ ram_dump.hex
(5) LPC 810 BOOT ROM dump
... \ LPCXpresso_6.X.X_X_XXX \ workspace \ STEST \ Release \ rom_dump.hex