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* Move UART code into its own file

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* Set up vectored interrupt controller
* Set up timer interrupt
This commit is contained in:
Gavan Fantom
2011-05-21 22:26:19 +00:00
parent 91c1c7e6be
commit e1b1b60a53
9 changed files with 272 additions and 84 deletions
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44
timer.c
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@@ -1,4 +1,6 @@
#include "timer.h"
#include "interrupt.h"
#include "uart.h"
#define TIMER0BASE 0xE0004000
#define TIMER1BASE 0xE0008000
@@ -28,14 +30,29 @@
#define TCR_ENABLE (1<<0)
#define TCR_RESET (1<<1)
#define MR0I (1<<0)
#define MR0R (1<<1)
#define MR0S (1<<2)
#define MR1I (1<<3)
#define MR1R (1<<4)
#define MR1S (1<<5)
#define MR2I (1<<6)
#define MR2R (1<<7)
#define MR2S (1<<8)
#define MR3I (1<<9)
#define MR3R (1<<10)
#define MR3S (1<<11)
void __attribute__((interrupt("IRQ"))) timer_interrupt_handler(void);
void init_timer(void)
{
TREG(TCR) = TCR_ENABLE | TCR_RESET;
TREG(CTCR) = 0; /* Use PCLK */
TREG(TC) = 0;
TREG(PR) = TIMER_PRESCALE ;
TREG(PC) = 0;
TWREG(TC) = 0;
TWREG(PR) = TIMER_PRESCALE ;
TWREG(PC) = 0;
TREG(TCR) = TCR_ENABLE;
}
@@ -51,3 +68,24 @@ void timer_delay_clocks(unsigned int clocks)
while (((signed int) (time-TWREG(TC))) > 0);
}
void timer_set_period(unsigned int period)
{
TWREG(MR0) = period;
TWREG(MCR) = MR0I | MR0R;
interrupt_register(TIMER0, timer_interrupt_handler);
}
void __attribute__((interrupt("IRQ"))) timer_interrupt_handler(void)
{
unsigned int ir;
ir = TREG(IR);
TREG(IR) = ir;
if (ir & (1<<0)) {
/* Match channel 0 */
putstr(" *timer0* ");
}
interrupt_clear();
}