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