Writing C on ARM Cortex M0 (NXP LPC1114/301)

To write assembly on the MCU: Writing Assembly Code for ARM Cortex M0

Example assembly and C code for LPC1114/301: Example Assembly and C Code for ARM Cortex M0 (NXP LPC1114/301)

Step 1. Create a Project with uVision 4 (Free evaluation of Keil MDK ARM v4: https://www.keil.com/download/product/)

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Step 2. Select NXP LPC1114/310 as the target device.

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Step 3. Copy “startup_LPC111x.s” into the project directory.

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Step 4. Copy the following files into the project directory.

File Name	Source (Assuming Keil uVision4 is installed in D:\Keil)
LPC11xx.h	D:\Keil\ARM\INC\NXP\LPC11xx
system_LPC11xx.h	D:\Keil\ARM\INC\NXP\LPC11xx
system_LPC11xx.c	D:\Keil\ARM\Startup\NXP\LPC11xx

Step 5. Right click on the “Source Group 1” and add “system_LPC11xx.c” to the current project.

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Step 5. Again right click on the “Source Group 1” and add a new .c file to the project. This file will contain the “__main()” function and interrupt service routines.

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Step 6. Write the application code in the .c file recently created.

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Code:

#include "LPC11xx.h" void __main(void) {         // Write user code here         unsigned int tempData1 = 0;             __NOP();         __NOP();         __NOP();         __NOP();                 // Infinite while loop         while(1)         {              tempData1++;         } // end of while(1) }

Compilation, Simulation, HEX file generation, and programming the MCU with the generated HEX file steps are same as in Writing Assembly Code for ARM Cortex M0.