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54 lines
994 B
54 lines
994 B
13 years ago
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#include "timer.h"
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#define TIMER0BASE 0xE0004000
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#define TIMER1BASE 0xE0008000
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#define IR 0x00
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#define TCR 0x04
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#define TC 0x08
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#define PR 0x0c
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#define PC 0x10
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#define MCR 0x14
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#define MR0 0x18
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#define MR1 0x1C
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#define MR2 0x20
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#define MR3 0x24
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#define CCR 0x28
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#define CR0 0x2C
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#define CR1 0x30
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#define CR2 0x34
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#define CR3 0x38
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#define EMR 0x3C
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#define CTCR 0x70
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#define PWM 0x74
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#define TREG(x) (((volatile unsigned char *)TIMER0BASE)[x])
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#define TWREG(x) (((volatile unsigned int *)TIMER0BASE)[(x)/sizeof(unsigned int)])
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#define TCR_ENABLE (1<<0)
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#define TCR_RESET (1<<1)
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void init_timer(void)
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{
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TREG(TCR) = TCR_ENABLE | TCR_RESET;
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TREG(CTCR) = 0; /* Use PCLK */
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TREG(TC) = 0;
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TREG(PR) = TIMER_PRESCALE ;
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TREG(PC) = 0;
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TREG(TCR) = TCR_ENABLE;
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}
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unsigned int timer_read(void)
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{
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return TWREG(TC);
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}
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void timer_delay_clocks(unsigned int clocks)
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{
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signed int time = TWREG(TC) + clocks;
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while (((signed int) (time-TWREG(TC))) > 0);
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}
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