osd-contiki/tests/tmr-ints.c
Mariano Alvira d3fed95235 tmr-ints
2010-02-26 16:15:26 -05:00

73 lines
2 KiB
C

#include <mc1322x.h>
#include <board.h>
#include "tests.h"
#include "config.h"
volatile uint8_t led;
#define LED_VAL LED_PURPLE
#define led_init() do { *GPIO_PAD_DIR0 = LED_VAL; } while(0);
#define led_on() do { led = 1; *GPIO_DATA0 = LED_VAL; } while(0);
#define led_off() do { led = 0; *GPIO_DATA0 = 0x00000000; } while(0);
void toggle_led(void) {
if(0 == led) {
led_on();
led = 1;
} else {
led_off();
}
}
void tmr_isr(void) {
toggle_led();
*TMR0_SCTRL = 0;
*TMR0_CSCTRL = 0x0040; /* clear compare flag */
}
void main(void) {
/* pin direction */
led_init();
/* timer setup */
/* CTRL */
#define COUNT_MODE 1 /* use rising edge of primary source */
#define PRIME_SRC 0xf /* Perip. clock with 128 prescale (for 24Mhz = 187500Hz)*/
#define SEC_SRC 0 /* don't need this */
#define ONCE 0 /* keep counting */
#define LEN 1 /* count until compare then reload with value in LOAD */
#define DIR 0 /* count up */
#define CO_INIT 0 /* other counters cannot force a re-initialization of this counter */
#define OUT_MODE 0 /* OFLAG is asserted while counter is active */
*TMR_ENBL = 0; /* tmrs reset to enabled */
*TMR0_SCTRL = 0;
*TMR0_CSCTRL = 0x0040;
*TMR0_LOAD = 0; /* reload to zero */
*TMR0_COMP_UP = 18750; /* trigger a reload at the end */
*TMR0_CMPLD1 = 18750; /* compare 1 triggered reload level, 10HZ maybe? */
*TMR0_CNTR = 0; /* reset count register */
*TMR0_CTRL = (COUNT_MODE<<13) | (PRIME_SRC<<9) | (SEC_SRC<<7) | (ONCE<<6) | (LEN<<5) | (DIR<<4) | (CO_INIT<<3) | (OUT_MODE);
*TMR_ENBL = 0xf; /* enable all the timers --- why not? */
led_on();
enable_tmr_irq();
/* go into user mode to handle IRQs */
/* disabling interrupts is now difficult */
asm(".code 32;"
"msr cpsr_c,#(0x10);"
".code 16; ");
while(1) {
/* sit here and let the interrupts do the work */
};
}