bmp_boot.c File Reference

System bootstrap code for BMP LPC1768. More...

#include "lpc17xx.h"
#include "bmp.h"

Functions
static void	die (uint32_t code)
	Curl up and die.
void	boot_proc (void)
	Reset (boot) handler.
static void	mem_copy (uint32_t *restrict to, const uint32_t *restrict from, uint32_t n)
	Copy memory by words.
static void	refresh_wdt (void)
	Refresh watchdog timer.
static void	flash_copy (uint32_t to, uint32_t from, int32_t size, int32_t arg4)
	Copy data into flash.

Variables
uint32_t	RO_LENGTH
	Size of this boot image.
uint32_t	STACK_LIMIT
	Stack top.
const uint32_t	pad = 0xdeaddead
	Fudge to force 4 byte alignment.
static const uint32_t	led_bit [] = {LED_3, LED_4, LED_5, LED_6}
	LED definitions.
static const boot_vec_t	boot_data
	Cortex M3 vector table.

Detailed Description

System bootstrap code for BMP LPC1768.

Copyright

© The University of Manchester - 2014-2015

Author

Steve Temple, APT Group, School of Computer Science

Function Documentation

die()

static void die ( uint32_t  code )

static

Curl up and die.

The top LED is turned on (Red on Spin5) and the code is put on the next 4 LEDs (Green on Spin5).

This is usually called from within code in this source file in which case the WDT is inactive and "die" will never exit. When "flash_copy" is called from the main code and the WDT is active then the WDT will trigger after the WDT period.

Parameters

[in]

code

What to show on the LEDs for diagnostic purposes

mem_copy()

static void mem_copy ( uint32_t *restrict  to, const uint32_t *restrict  from, uint32_t  n  )

static

Copy memory by words.

Parameters

[in]	to	Where to copy to
[in]	from	Where to copy from
[in]	n	Number of words to copy

flash_copy()

static void flash_copy ( uint32_t  to, uint32_t  from, int32_t  size, int32_t  arg4  )

static

Copy data into flash.

Parameters

[in]	to	Where to copy data to
[in]	from	Where to copy data from
[in]	size	Number of bytes to copy; should be multiple of 4kB
	arg4	ignored

Variable Documentation

boot_data

const boot_vec_t boot_data

static

Initial value:

= {
    &STACK_LIMIT,               
    boot_proc,                  
    (proc4) flash_copy,         
    (proc4) 0,                  
    (proc4) 0,                  
    BUILD_DATE,                 
    BMP_VER_NUM,                
    0                           
}

Cortex M3 vector table.

This short one lives at the bottom of flash memory. It's only used for booting. The checksum at word 7 needs to be computed and filled in by someone. The "openocd" JTAG application can do this as can "sum.pl"