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parent topic [[Microcontrollers|Microcontrollers]]
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__TOC__
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== [[#top|^]] Overview ==
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This local page to hold notes related to NXP semiconductor company, headquartered in Eindhoven, Netherlands.
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<!-- comentario -->
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== [[#top|^]] MCUs ==
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Starting point for datasheet and user manual links to specific NXP MCU families:
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<ul>
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*  https://www.nxp.com/docs/en/data-sheet/LPC11U6X.pdf
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*  https://www.nxp.com/docs/en/nxp/data-sheets/LPC55S6x_DS.pdf  LPC55S69 datasheet.  See page 47 of 133 for course configuration register map.
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</ul>
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An important security concern of the LPC55S69 is detailed here in an Oxide dot computer article:
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<ul>
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*  https://oxide.computer/blog/exploiting-undocumented-hardware-blocks-in-the-lpc55s69
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</ul>
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A related article from 0xide company (Oxide company spelled for searchability) regarding LPC55S69 undocumented features:
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<ul>
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*  https://www.youtube.com/watch?v=eKKgaGbcq4o
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</ul>
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<!-- comentario -->
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== [[#top|^]] Development Kits ==
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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:
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*  https://www.nxp.com/docs/en/application-note/AN12282.pdf  LPC55S69 multi-core DSP capabilities
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*  https://www.nxp.com/docs/en/application-note/AN12335.pdf  LPC55xx/LPC55Sxx Dual Core Communication
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*  https://www.nxp.com/docs/en/application-note/AN12358.pdf  LPC55xx/LPC55Sxx Dual-Core Debug in MCUXpresso
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*  https://community.nxp.com/t5/Blogs/LPC55xx-Multicore-Applications-with-MCUXpresso-IDE/ba-p/1130891  LPC55xx Multicore Applications with MCUXpresso IDE
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A link to download multi-core document:
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*  https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/blog/379/1/LPC55xx_Multicore_v1.00.pdf
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Schematic files for LPC55S69-EVK at this link, but requires NXP user account and login:
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*  https://www.nxp.com/design/development-boards/lpcxpresso-boards/lpcxpresso55s69-development-board:LPC55S69-EVK
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<!-- comentario -->
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== [[#top|^]] Technologies and Features ==
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2022
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<ul>
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0721
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*  http://www.nxp.com/docs/en/application-note/AN2708.pdf  intro to External Bus Interface EBI
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*  https://www.nxp.com/docs/en/user-guide/DSP56F827EVMUM.pdf  DSP56F827 evaluation board
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</ul>
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2022
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<ul>
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0721
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*  https://www.digikey.com/en/products/detail/nxp-usa-inc/LPC3250FET296-01K/13540936  MCU LPC3250FET296
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</ul>
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<!-- comentario -->
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== [[#top|^]] NXP Bootloading ==
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NXP's document on their built-in ROM based bootloader:
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*  https://www.nxp.com/docs/en/reference-manual/MCUBOOTRM.pdf
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Some NXP community forum posts:
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*  https://community.nxp.com/t5/MCU-Bootloader/Entry-and-Exit-of-ROM-Bootloader-MKE18F-MCUXpresso/m-p/905906
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*  https://community.nxp.com/t5/NXP-Designs/Bootloader-and-ISP-for-LPC55S69/m-p/1061246
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How to enter NXP ROM bootloader from firmware:
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*  https://community.nxp.com/t5/LPC-Microcontrollers/How-can-I-boot-to-LPC55-to-BOOT-ROM-from-firmware-code-Previous/td-p/1078635
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<ul>
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Solution on github, written in rust language?  Need to confirm this . . .
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*  https://github.com/lpc55/lpc55-hal/pull/51/files
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*  https://github.com/lpc55/lpc55-hal
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</ul>
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Known ROM bootloader issue of NXP with no plans for fix:
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*  https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S69-ROM-bootloader-hangs-if-Flash-operations-are/m-p/1212531
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<!-- comentario -->
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== [[#top|^]] To Sort ==
  
 
Microcontrollers de NXP, starting with a NXP's Line Card:
 
Microcontrollers de NXP, starting with a NXP's Line Card:
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*  http://www.nxp.com/docs/en/product-selector-guide/LPCMICROLNCD.pdf
 
*  http://www.nxp.com/docs/en/product-selector-guide/LPCMICROLNCD.pdf
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And an article at Wikipedia:
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*  https://en.wikipedia.org/wiki/NXP_LPC
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*  https://www.nxp.com/docs/en/user-guide/UM10946-om13084_88.pdf
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How to program dual-core microcontrollers:
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*  https://community.arm.com/developer/ip-products/processors/f/cortex-a-forum/4105/how-to-build-an-application-for-dual-core-m4-m0-mcu/18010
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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:
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<pre>
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;/* File: example.s */
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        .syntax unified            /* this makes the assembler automatically generate IT instructions for you */
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        .cpu    cortex-m0          /* this selects the cortex-m0 architecture and helps you avoid using cortex-m3/cortex-m4 instructions */
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        .text                      /* this makes sure the code goes into the .text section */
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        .global m0vectors
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        .word  0x20004000          /* this defines the initial stack pointer for the Cortex-M0 */
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        .word  m0reset            /* the reset exception vector */
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/* here you should place your other exception vectors. There are too many to include in this example */
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        .global m0test              /* this exports the symbol m0test, so you can reference it from for instance C */
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        .func  m0test,m0test      /* this names the symbol m0test as a function (for the debug-info) */
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        .type  m0test,%function    /* this tells the assembler (and linker) what kind of symbol we're generating */
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        .thumb_func                /* this is necessary if pointers use the symbol */
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        .align                      /* this makes sure the code is positioned on a 16-bit boundary */
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m0test:                            /* this defines the actual symbol */
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        ldr    r0,=0x01234567      /* example code, load a value into r0 */
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        bx      lr                  /* return to the calling function */
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m0reset:
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        bl      m0test              /* this is the startup-code, call our function */
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lockup: wfi                        /* sleep the CPU; it'll wake up if an interrupt occurs */
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        b      lockup              /* go back to sleep */
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        .size  m0test, . - m0test  /* this tells the linker how big this function is, so it can correctly exclude it if it's unused */
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        .endfunc                    /* this marks the end of the function (for the debug-info) */
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You can then refer to the code from your C file...
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/* File: main.c */
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#include <ipc_queue.h>
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/* Note: you don't need argc and argv on a microcontroller. */
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int main(int argc, const char *argv[])
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{
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    IPC_haltSlave();
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    SET_SLAVE_SHADOWREG(m0vectors);
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    IPC_startSlave();
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    while(1)
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    {
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          asm volatile("wfi");
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    }
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    return(0);
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}
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</pre>
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<!-- comentario -->
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== [[#top|^]] References ==
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*  https://media.defcon.org/DEF%20CON%2029/DEF%20CON%2029%20presentations/Laura%20Abbott%20Rick%20Altherr%20-%20Breaking%20TrustZone-M%20-%20%20Privilege%20Escalation%20on%20LPC55S69.pdf
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<!-- comentario -->
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__TOC__
  
  

Latest revision as of 19:57, 15 February 2023

parent topic Microcontrollers



^ 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:

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:

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

2022


^ 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:

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




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