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FS#11172 - Fuzev2: Read the scrollwheel scrollwheel via IRQ
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25736 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz
parent
ee291a5e9b
commit
249aae587a
9 changed files with 242 additions and 58 deletions
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@ -24,37 +24,198 @@
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#include "button.h"
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#include "backlight.h"
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extern void scrollwheel(unsigned wheel_value);
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#ifdef HAS_BUTTON_HOLD
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static bool hold_button = false;
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#endif
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#ifdef HAVE_SCROLLWHEEL
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#define SCROLLWHEEL_BITS (1<<7|1<<6)
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/* TIMER units */
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#define TIMER_TICK (TIMER_FREQ/HZ) /* how long a tick lasts */
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#define TIMER_MS (TIMER_TICK/(1000/HZ))/* how long a ms lasts */
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#define WHEEL_REPEAT_INTERVAL (300*TIMER_MS) /* 300ms */
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#define WHEEL_FAST_ON_INTERVAL ( 20*TIMER_MS) /* 20ms */
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#define WHEEL_FAST_OFF_INTERVAL ( 60*TIMER_MS) /* 60ms */
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/* phsyical clicks per rotation * wheel value changes per phys click */
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#define WHEEL_CHANGES_PER_CLICK 4
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#define WHEELCLICKS_PER_ROTATION (12*WHEEL_CHANGES_PER_CLICK)
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/*
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* based on button-e200.c, adjusted to the AMS timers and fuzev2's
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* scrollwheel and cleaned up a little
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*/
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static void scrollwheel(unsigned int wheel_value)
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{
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/* wheel values and times from the previous irq */
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static unsigned int old_wheel_value = 0;
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static unsigned int wheel_repeat = BUTTON_NONE;
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static long last_wheel_post = 0;
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/* We only post every 4th action, as this matches better with the physical
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* clicks of the wheel */
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static unsigned int wheel_click_count = 0;
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/* number of items to skip in lists, 1 in slow mode */
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static unsigned int wheel_delta = 0;
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/* accumulated wheel rotations per second */
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static unsigned long wheel_velocity = 0;
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/* fast or slow mode? */
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static int wheel_fast_mode = 0;
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/* Read wheel
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* Bits 6 and 7 of GPIOA change as follows (Gray Code):
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* Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00
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* Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00
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*
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* For easy look-up, actual wheel values act as indicies also,
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* which is why the table seems to be not ordered correctly
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*/
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static const unsigned char wheel_tbl[2][4] =
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{
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{ 2, 0, 3, 1 }, /* Clockwise rotation */
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{ 1, 3, 0, 2 }, /* Counter-clockwise */
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};
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unsigned int btn = BUTTON_NONE;
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if (old_wheel_value == wheel_tbl[0][wheel_value])
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btn = BUTTON_SCROLL_FWD;
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else if (old_wheel_value == wheel_tbl[1][wheel_value])
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btn = BUTTON_SCROLL_BACK;
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if (btn == BUTTON_NONE)
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{
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old_wheel_value = wheel_value;
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return;
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}
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int repeat = 1; /* assume repeat */
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long time = TIMER1_VALUE + current_tick*TIMER_TICK; /* to timer unit */
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long v = (time - last_wheel_post);
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/* interpolate velocity in timer_freq/timer_unit == 1/s */
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if (v) v = TIMER_FREQ / v;
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/* accumulate velocities over time with each v */
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wheel_velocity = (7*wheel_velocity + v) / 8;
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if (btn != wheel_repeat)
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{
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/* direction reversals nullify all fast mode states */
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wheel_repeat = btn;
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repeat =
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wheel_velocity =
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wheel_click_count = 0;
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}
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if (wheel_fast_mode != 0)
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{
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/* fast OFF happens immediately when velocity drops below
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threshold */
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if (TIME_AFTER(time,
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last_wheel_post + WHEEL_FAST_OFF_INTERVAL))
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{
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/* moving out of fast mode */
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wheel_fast_mode = 0;
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/* reset velocity */
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wheel_velocity = 0;
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/* wheel_delta is always 1 in slow mode */
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wheel_delta = 1;
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}
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}
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else
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{
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/* fast ON gets filtered to avoid inadvertent jumps to fast mode */
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if (repeat && wheel_velocity > TIMER_FREQ/WHEEL_FAST_ON_INTERVAL)
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{
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/* moving into fast mode */
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wheel_fast_mode = 1 << 31;
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wheel_click_count = 0;
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wheel_velocity = TIMER_FREQ/WHEEL_FAST_OFF_INTERVAL;
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}
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else if (++wheel_click_count < WHEEL_CHANGES_PER_CLICK)
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{ /* skip some wheel changes, so that 1 post represents
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* 1 item in lists */
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btn = BUTTON_NONE;
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}
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/* wheel_delta is always 1 in slow mode */
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wheel_delta = 1;
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}
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if (btn != BUTTON_NONE)
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{
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wheel_click_count = 0;
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/* generate repeats if quick enough */
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if (repeat && TIME_BEFORE(time,
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last_wheel_post + WHEEL_REPEAT_INTERVAL))
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btn |= BUTTON_REPEAT;
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last_wheel_post = time;
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if (queue_empty(&button_queue))
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{
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queue_post(&button_queue, btn, wheel_fast_mode |
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(wheel_delta << 24) | wheel_velocity*360/WHEELCLICKS_PER_ROTATION);
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/* message posted - reset delta and poke backlight on*/
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wheel_delta = 1;
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backlight_on();
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buttonlight_on();
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}
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else
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{
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/* skipped post - increment delta */
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if (++wheel_delta > 0x7f)
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wheel_delta = 0x7f;
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}
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}
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old_wheel_value = wheel_value;
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}
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#endif
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void button_init_device(void)
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{
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#if defined(HAVE_SCROLLWHEEL)
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GPIOA_DIR &= ~(1<<6|1<<7);
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GPIOC_DIR = 0;
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GPIOB_DIR |= (1<<4)|(1<<0);
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GPIOB_PIN(4) = 1<<4; /* activate the wheel */
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}
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void get_scrollwheel(void)
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{
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#if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
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/* scroll wheel handling */
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#define GPIOA_PIN76_offset ((1<<(6+2)) | (1<<(7+2)))
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#define GPIOA_PIN76 (*(volatile unsigned char*)(GPIOA_BASE+GPIOA_PIN76_offset))
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scrollwheel(GPIOA_PIN76 >> 6);
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/* setup scrollwheel isr */
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/* clear previous irq if any */
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GPIOA_IC = SCROLLWHEEL_BITS;
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/* enable edge detecting */
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GPIOA_IS &= ~SCROLLWHEEL_BITS;
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/* detect both raising and falling edges */
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GPIOA_IBE |= SCROLLWHEEL_BITS;
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/* lastly, enable the interrupt */
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GPIOA_IE |= SCROLLWHEEL_BITS;
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#endif
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}
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/* read the 2 bits at the same time */
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#define GPIOA_PIN76_offset ((1<<(6+2)) | (1<<(7+2)))
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#define GPIOA_PIN76 (*(volatile unsigned char*)(GPIOA_BASE+GPIOA_PIN76_offset))
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void button_gpioa_isr(void)
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{
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#if defined(HAVE_SCROLLWHEEL)
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/* scroll wheel handling */
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if (GPIOA_MIS & SCROLLWHEEL_BITS)
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scrollwheel(GPIOA_PIN76 >> 6);
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/* ack interrupt */
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GPIOA_IC = SCROLLWHEEL_BITS;
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#endif
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}
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/*
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* Get button pressed from hardware
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*/
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int button_read_device(void)
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{
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int btn = 0;
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@ -62,12 +223,12 @@ int button_read_device(void)
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static long power_counter = 0;
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unsigned gpiod6;
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/* if we don't wait for the fifo to empty, we'll see screen corruption
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* (the higher the CPU frequency the higher the corruption) */
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while ((DBOP_STAT & (1<<10)) == 0);
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get_scrollwheel();
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int delay = 30;
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while(delay--) nop;
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CCU_IO &= ~(1<<12);
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@ -77,6 +238,7 @@ int button_read_device(void)
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gpiod6 = GPIOD_PIN(6);
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GPIOB_PIN(0) = 0;
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udelay(1);
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if (GPIOC_PIN(1) & 1<<1)
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@ -114,6 +276,12 @@ int button_read_device(void)
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{
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hold_button_old = hold_button;
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backlight_hold_changed(hold_button);
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/* mask scrollwheel irq so we don't need to check for
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* the hold button in the isr */
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if (hold_button)
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GPIOA_IE &= ~SCROLLWHEEL_BITS;
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else
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GPIOA_IE |= SCROLLWHEEL_BITS;
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}
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#else
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(void)hold_button_old;
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@ -30,12 +30,6 @@
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void button_init_device(void);
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bool button_hold(void);
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int button_read_device(void);
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void get_scrollwheel(void);
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#define WHEEL_REPEAT_INTERVAL (HZ/5)
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#define WHEEL_COUNTER_DIV 4
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#define ACCEL_INCREMENT 2
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#define ACCEL_SHIFT 2
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/* Sandisk Sansa Fuze button codes */
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/* Main unit's buttons */
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