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/*
* LPC22XX/LPC21xx Startup code
*
* Copyright (c) 2007 by Ray Xu <rayx.cn@gmail.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/irq-generic.h>
#include <lpc22xx.h>
/*
* Function prototypes
*/
extern void rtems_exception_init_mngt(void);
extern void UART0_Ini(void);
extern void printi(unsigned long);
/*
* bsp_start_default - BSP initialization function
*
* This function is called before RTEMS is initialized and used
* adjust the kernel's configuration.
*
* This function also configures the CPU's memory protection unit.
*
* RESTRICTIONS/LIMITATIONS:
* Since RTEMS is not configured, no RTEMS functions can be called.
*
*/
void bsp_start_default( void )
{
PINSEL2 =0x0f814914;
BCFG0 = 0x1000ffef;
BCFG1 = 0x1000ffef;
MEMMAP = 0x2; //debug and excute outside chip
PLLCON = 1;
#if (Fpclk / (Fcclk / 4)) == 1
VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
VPBDIV = 1;
#endif
#if (Fcco / Fcclk) == 2
PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
#endif
#if (Fcco / Fcclk) == 8
PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
#endif
#if (Fcco / Fcclk) == 16
PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
#endif
PLLFEED = 0xaa;
PLLFEED = 0x55;
while((PLLSTAT & (1 << 10)) == 0);
PLLCON = 3;
PLLFEED = 0xaa;
PLLFEED = 0x55;
/* memory configure */
/* it is not needed in my formatter board */
//MAMCR = 0;
// MAMTIM = 3;
//MAMCR = 2;
UART0_Ini();
/*
* Init rtems exceptions management
*/
rtems_exception_init_mngt();
/*
* Init rtems interrupt management
*/
if (bsp_interrupt_initialize() != RTEMS_SUCCESSFUL) {
_CPU_Fatal_halt(0xe);
}
} /* bsp_start */
/*
* By making this a weak alias for bsp_start_default, a brave soul
* can override the actual bsp_start routine used.
*/
void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default")));
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