124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
//---
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// gint:keysc - The SH7305 and I/O Key Scan Interfaces
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//---
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#include <gint/drivers.h>
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#include <gint/gint.h>
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#include <gint/timer.h>
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#include <gint/clock.h>
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#include <gint/keyboard.h>
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#include <gint/drivers/keydev.h>
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#include <gint/defs/attributes.h>
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#include <gint/defs/types.h>
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#include <gint/drivers/iokbd.h>
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#include <gint/hardware.h>
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#include <stdarg.h>
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/* Keyboard scan frequency in Hertz. Start with 128 Hz, this frequency *must
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be high* for the keyboard to work! Reading at low frequencies produces a lot
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of artifacts. See https://www.casiopeia.net/forum/viewtopic.php?p=20592. */
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int keysc_scan_Hz = 128;
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/* Approximation in microseconds, used by the timer and repeat delays */
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uint32_t keysc_scan_us = 7812; /* 1000000 / keysc_scan_Hz */
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/* Keyboard scanner timer */
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int keysc_tid = -1;
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/* Keyboard input device for this Key Scan Interface */
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static keydev_t keysc_dev;
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/* keydev_std(): Standard keyboard input device */
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keydev_t *keydev_std(void)
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{
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return &keysc_dev;
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}
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/* keysc_tick(): Update the keyboard to the next state */
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static int keysc_tick(void)
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{
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GALIGNED(2) uint8_t scan[12] = { 0 };
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/* Scan the key matrix: from I/O ports on SH3, KEYSC on SH4 */
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if(isSH3()) iokbd_scan(scan);
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else
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{
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volatile uint16_t *KEYSC = (void *)0xa44b0000;
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uint16_t *array = (void *)&scan;
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for(int i = 0; i < 6; i++) {
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array[i] = KEYSC[i];
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array[i] = (array[i] << 8) | (array[i] >> 8);
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}
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}
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keydev_process_state(&keysc_dev, scan);
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keydev_tick(&keysc_dev, keysc_scan_us);
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return TIMER_CONTINUE;
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}
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/* pollevent() - poll the next keyboard event */
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key_event_t pollevent(void)
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{
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return keydev_unqueue_event(&keysc_dev);
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}
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/* waitevent() - wait for the next keyboard event */
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key_event_t waitevent(volatile int *timeout)
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{
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while(1)
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{
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key_event_t ev = pollevent();
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if(ev.type != KEYEV_NONE) return ev;
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if(timeout && *timeout) break;
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sleep();
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}
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key_event_t ev = { .type = KEYEV_NONE, .time = keysc_dev.time };
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return ev;
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}
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/* clearevents(): Read all events waiting in the queue */
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void clearevents(void)
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{
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while(pollevent().type != KEYEV_NONE);
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}
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/* keydown(): Current key state */
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int keydown(int key)
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{
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return keydev_keydown(&keysc_dev, key);
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}
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//---
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// Driver initialization
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//---
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static void configure(void)
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{
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keydev_init(&keysc_dev);
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/* Set the default repeat to 400/40 ms */
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keydev_t *d = keydev_std();
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keydev_set_transform(d, (keydev_transform_t){ KEYDEV_TR_REPEATS, NULL });
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keydev_set_standard_repeats(d, 400 * 1000, 40 * 1000);
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/* The timer will be stopped when the timer driver is unloaded */
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keysc_tid = timer_configure(TIMER_ANY, keysc_scan_us,
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GINT_CALL(keysc_tick));
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if(keysc_tid >= 0) timer_start(keysc_tid);
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gint[HWKBD] = HW_LOADED | (isSH3() ? HWKBD_IO : HWKBD_KSI);
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}
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//---
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// State and driver metadata
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//---
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gint_driver_t drv_keysc = {
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.name = "KEYSC",
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.configure = configure,
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};
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GINT_DECLARE_DRIVER(23, drv_keysc);
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