main.c

来自「自己写的一个基于kb9202开发板的bootloader」· C语言 代码 · 共 58 行

#include "at91rm9200.h"
#include "uart.h"
#include "xmodem.h"
#include "network.h"
#include "cmd.h"

inline void tc_init(){
	tc_reg_p tc0 = (tc_reg_s *)TC0_BASE;
	tc0->tcc[0].tc_ccr = 1<<TC_CLKDIS;
	tc0->tcc[0].tc_rc = 0xc000;				//288k/48k=6
	tc0->tcc[0].tc_cmr = (TIMER_CLOCK4) | (TC_CPCTRG);		//clock=36M/128=288k
	tc0->tcc[0].tc_ier = 1<<TC_CPCS;
}

inline void pmc_init(){
	pmc_reg_p pmc  = (pmc_reg_s *)PMC_BASE;
/* pll configuration */
	pmc->ckgr_pllar = 0x20473f05;	//diva=5, mula=72, pllacount=63, the plla out = 10/5*72=144MHz
	while( !( pmc->pmc_sr&(1<<1) ) );
	pmc->pmc_mckr = 0x106;			//prescale=2, pck=144/2=72MHz. mdiv=2, mck=72/2=36MHz
	while( !( pmc->pmc_sr&(1<<3) ) );
	pmc->pmc_pcer = 1<<ID_TC0;		//enable the clock for tc0
//	pmc->pmc_pcer = (1<<ID_PIOA) || (1<<ID_PIOB) || (1<<ID_PIOC);	//enable the clock for pioa,b,c
}

inline void aic_init(){
	aic_reg_p aic = (aic_reg_s *)AIC_BASE;
	aic->aic_idcr = 1<<ID_TC0;
//	aic->aic_smr[ID_TC0] = ;
	aic->aic_svr[ID_TC0] = (unsigned)int_tc;
	aic->aic_iccr = 1<<ID_TC0;
	aic->aic_iecr = 1<<ID_TC0;
}

inline void led_init(){
	int value;
	pio_reg_p pioc = (pio_reg_s *)PIOC_BASE;

	value = LED1 | LED2 | LED3;
	pioc->pio_odr &= ~value;
	pioc->pio_oer |= value;
	pioc->pio_pdr &= ~value;
	pioc->pio_per |= value;
	pioc->pio_owdr &= ~value;
	pioc->pio_ower =  value;
}

void reset(){
	pmc_init();
	led_init();
	dbgu_init();
	tc_init();
	aic_init();
	emac_init();
	arp_test();
	cmd_loop();
}