Microcontrollers-nxp
parent topic Microcontrollers
Contents
^ Overview
This local page to hold notes related to NXP semiconductor company, headquartered in Eindhoven, Netherlands.
^ MCUs
Starting point for datasheet and user manual links to specific NXP MCU families:
- https://www.nxp.com/docs/en/data-sheet/LPC11U6X.pdf
- https://www.nxp.com/docs/en/nxp/data-sheets/LPC55S6x_DS.pdf LPC55S69 datasheet. See page 47 of 133 for course configuration register map.
An important security concern of the LPC55S69 is detailed here in an Oxide dot computer article:
A related article from 0xide company (Oxide company spelled for searchability) regarding LPC55S69 undocumented features:
^ Development Kits
Development kit for the LPC55S69 MCU intro page at https://www.nxp.com/document/guide/getting-started-with-the-lpc55s69-evk-evaluation-board:GS-LPC55S69-EVK. From here a couple of useful further documents or chapters to this effective users' manual are . . . reached by clicking once on left pane navigation links, which load content into a right hand pane of the above linked manual. In the page on multi-core examples and use there are external links to some important application notes including:
- https://www.nxp.com/docs/en/application-note/AN12282.pdf LPC55S69 multi-core DSP capabilities
- https://www.nxp.com/docs/en/application-note/AN12335.pdf LPC55xx/LPC55Sxx Dual Core Communication
- https://www.nxp.com/docs/en/application-note/AN12358.pdf LPC55xx/LPC55Sxx Dual-Core Debug in MCUXpresso
- https://community.nxp.com/t5/Blogs/LPC55xx-Multicore-Applications-with-MCUXpresso-IDE/ba-p/1130891 LPC55xx Multicore Applications with MCUXpresso IDE
A link to download multi-core document:
Schematic files for LPC55S69-EVK at this link, but requires NXP user account and login:
^ Technologies and Features
2022
-
0721
- http://www.nxp.com/docs/en/application-note/AN2708.pdf intro to External Bus Interface EBI
- https://www.nxp.com/docs/en/user-guide/DSP56F827EVMUM.pdf DSP56F827 evaluation board
2022
-
0721
^ NXP Bootloading
NXP's document on their built-in ROM based bootloader:
Some NXP community forum posts:
How to enter NXP ROM bootloader from firmware:
-
Solution on github, written in rust language? Need to confirm this . . .
Known ROM bootloader issue of NXP with no plans for fix:
^ To Sort
Microcontrollers de NXP, starting with a NXP's Line Card:
2021-07-08
And an article at Wikipedia:
How to program dual-core microcontrollers:
Not sure how useful this code example will be, it is posted in or around 2014. Hard to read on the NXP forum due to some funky formatting:
;/* File: example.s */
.syntax unified /* this makes the assembler automatically generate IT instructions for you */
.cpu cortex-m0 /* this selects the cortex-m0 architecture and helps you avoid using cortex-m3/cortex-m4 instructions */
.text /* this makes sure the code goes into the .text section */
.global m0vectors
.word 0x20004000 /* this defines the initial stack pointer for the Cortex-M0 */
.word m0reset /* the reset exception vector */
/* here you should place your other exception vectors. There are too many to include in this example */
.global m0test /* this exports the symbol m0test, so you can reference it from for instance C */
.func m0test,m0test /* this names the symbol m0test as a function (for the debug-info) */
.type m0test,%function /* this tells the assembler (and linker) what kind of symbol we're generating */
.thumb_func /* this is necessary if pointers use the symbol */
.align /* this makes sure the code is positioned on a 16-bit boundary */
m0test: /* this defines the actual symbol */
ldr r0,=0x01234567 /* example code, load a value into r0 */
bx lr /* return to the calling function */
m0reset:
bl m0test /* this is the startup-code, call our function */
lockup: wfi /* sleep the CPU; it'll wake up if an interrupt occurs */
b lockup /* go back to sleep */
.size m0test, . - m0test /* this tells the linker how big this function is, so it can correctly exclude it if it's unused */
.endfunc /* this marks the end of the function (for the debug-info) */
You can then refer to the code from your C file...
/* File: main.c */
#include <ipc_queue.h>
/* Note: you don't need argc and argv on a microcontroller. */
int main(int argc, const char *argv[])
{
IPC_haltSlave();
SET_SLAVE_SHADOWREG(m0vectors);
IPC_startSlave();
while(1)
{
asm volatile("wfi");
}
return(0);
}
^ References
