OpenSMC/main.c at main · kmx360/OpenSMC · GitHub

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#include "smcregs.h"
#include "smcpins.h"
#include "dbg_led.h"

void irq_init(void);
void millis_init(void);
_Bool millis_check_20ms(void);
void watchdog_kick(void);
void port_init(void);

void smc_main(void)
{
    irq_init();
    millis_init();
    watchdog_kick();

    port_init();

    for (;;) {
        // Do every 20 ms
        watchdog_kick();
        dbg_led_fsm();

        // Do fast
        do {

        } while (!millis_check_20ms());
    }
}

void irq_init(void)
{
    IRQ_CTRL      = 1;
    IRQ_MASK      = 0xff;
    IRQ_bd        = 0xff;
    IRQ_be        = 0xff;
    IRQ_b9        = 0;
    IRQ_ba        = 0;
    IRQ_bb        = 0;
    IRQ_a8        = 0;
    IRQ_b8        = 0;
    IRQ_c1        = 0;
    IRQ_c2        = 0;
    IRQ_c3        = 0x3f;
    IRQ_c4        = 0;
    IRQ_c5        = 0xce;
    IRQ_c6        = 0xe3;
    IRQ_c7        = 0xd0;
    IRQ_c9        = 0xc9;
    IRQ_ca        = 0xd3;
    IRQ_cb        = 0xd9;
    IRQ_cc        = 0xff;
    IRQ_cd        = 0xff;
    IRQ_ce        = 0xff;
    IRQ_cf        = 0xff;
    IRQ_d1        = 0xff;
    IRQ_d2        = 0xff;
    IRQ_d3        = 0xff;
    IRQ_d4        = 0xff;
}

static unsigned char millis_count;

void millis_init(void)
{
    millis_count    = 0;
    IRQ_MASK        &= 0x7f;
    IRQ_CTRL        &= 0xfe;
}

_Bool millis_check_20ms(void)
{
    if (millis_count < 20) {
        return 0;
    }
    IRQ_CTRL        |= 1;
    millis_count    -= 20;
    IRQ_CTRL        &= 0xfe;
    return 1;
}

void int_handler_millis(void) __interrupt
{
    IRQ_CTRL        |= 1;
    millis_count    += 1;
    IRQ_b8          &= 0x7f;
    IRQ_CTRL        &= 0xfe;
}

void port_init(void)
{
    P0_DIR        |= 0xb0;
    P1_DIR        |= 0x7b;
    P2_DIR        |= 0x3b;
    P3_DIR        |= 0x07;
    P4_DIR        |= 0xbf;
    P0_OD         = 0xc;
    P1_OD         = 0;
    P2_OD         = 0;
    P3_OD         = 0;
    P4_OD         = 0;
    P0            = 0;
    P1            = 4;
    P2            = 0;
    P3            = 0;
    P4            = 0;
    P0_DIR        = 0xb0;
    P1_DIR        = 0x7b;
    P2_DIR        = 0x3b;
    P3_DIR        = 0x07;
    P4_DIR        = 0xbf;
}

void int_default(void) __interrupt
{
    IRQ_MASK    |= 0x36;
    IRQ_bd      |= 0xff;
    IRQ_bd      |= 0x3f;
}

void watchdog_kick(void)
{
    WATCHDOG_fe = 0x00;
    WATCHDOG_ff = 0x00;
    WATCHDOG_fe = 0x00;
}

void watchdog_reboot(void)
{
    IRQ_CTRL    |= 1;
    WATCHDOG_ff = 0x00;
    WATCHDOG_fe = 0xff;
    for (;;)
        ;
}