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Sansa Clip+: Implement button driver.

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Initial button driver for clip+.  I've followed the steps the OF uses to read the buttons.
There is no hold button on the clip+ so for now calling button_hold() siply returns false.
The OF actually sets an additional flag for the 2nd read from D6 and not BUTTON_POWER as I have done here. 

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24669 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2010-02-15 19:29:47 +00:00
parent 51a8be1a0f
commit 3a60a6aa23
1 changed files with 73 additions and 1 deletions
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74
firmware/target/arm/as3525/sansa-clipplus/button-clip.c
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@ -27,7 +27,79 @@ void button_init_device(void)
{
}
bool button_hold(void)
{
/* TODO OF uses long home(A1) press. Just return false for now */
return false;
}
int button_read_device(void)
{
return 0;
static int buttons = 0;
/* Set pins to input for reading buttons */
GPIOC_DIR = 0; /* All C pins input */
GPIOA_DIR &= ~(1<<1|1<<6|1<<7); /* Pins A1,A6,A7 input */
/* OF does not set D6 to input */
/* TODO No hold button Hold toggled by long home(A1) press in OF */
if(button_hold())
{
return 0;
}
/* Buttons do not appear to need reset */
/* D6 needs special handling though */
GPIOB_DIR |= (1<<0); /* Pin B0 set output */
GPIOB_PIN(0) = 1; /* set B0 */
int delay = 500;
do {
asm volatile("nop\n");
} while (delay--);
if GPIOD_PIN(6) /* read D6 */
buttons |= BUTTON_POWER;
GPIOB_PIN(0) = 0; /* unset B0 */
delay = 240;
do {
asm volatile("nop\n");
} while (delay--);
if GPIOA_PIN(1)
buttons |= BUTTON_HOME;
if GPIOA_PIN(6)
buttons |= BUTTON_VOL_DOWN;
if GPIOA_PIN(7)
buttons |= BUTTON_VOL_UP;
if GPIOC_PIN(2)
buttons |= BUTTON_UP;
if GPIOC_PIN(3)
buttons |= BUTTON_LEFT;
if GPIOC_PIN(4)
buttons |= BUTTON_SELECT;
if GPIOC_PIN(5)
buttons |= BUTTON_RIGHT;
if GPIOC_PIN(1)
buttons |= BUTTON_DOWN;
/* TODO figure out why OF does this */
if (buttons & BUTTON_POWER)
{
GPIOB_DIR |= (1<<6); /* Pin B6 output */
delay = 8;
do {
asm volatile("nop\n");
} while (delay--);
if GPIOD_PIN(6)
buttons |= BUTTON_POWER; /* OF sets a different flag than PWR */
}
return buttons;
}