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Sansa c200v2: update DBOP button reading mechanism, this enables readout of the volume buttons, rec and hold button.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22635 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-09-05 18:56:59 +00:00
parent 4034e0b47f
commit 533c29b2f2
2 changed files with 63 additions and 48 deletions
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52
firmware/target/arm/lcd-c200_c200v2.c
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@ -29,6 +29,7 @@
#ifdef SANSA_C200V2
/* button driver needs to know if a lcd operation is in progress */
static bool lcd_busy = false;
static unsigned short dbop_input = 0xFFFF;
#endif
/* Display status */
@ -182,24 +183,45 @@ static inline void as3525_dbop_init(void)
lcd_delay(20);
}
/* we need to set the DBOP_DOUT pins high, for correct dbop reads */
bool lcd_button_support(void)
static unsigned short lcd_dbop_read(void)
{
const fb_data data = 0xffff;
unsigned int dbop_ctrl_old = DBOP_CTRL;
unsigned int dbop_timpol23_old = DBOP_TIMPOL_23;
unsigned int value;
/* make sure that the DBOP FIFO is empty */
while ((DBOP_STAT & (1<<10)) == 0);
if (lcd_busy) /* we can't use dbop for reading if we are in the */
return false; /* middle of a write operation */
/* write DBOP_DOUT to pre-charge DBOP data lines with a high level */
DBOP_TIMPOL_23 = 0xe167e167; /* no strobe towards lcd */
DBOP_CTRL = (1 << 16) | /* enw=1 (enable write) */
(1 << 12); /* ow=1 (16-bit data width) */
DBOP_DOUT = 0xFFFF; /* all pins high */
while ((DBOP_STAT & (1<<10)) == 0);
/* use out of screen coordinates */
lcd_send_command(R_X_ADDR_AREA, 0);
lcd_send_command(1, 0);
lcd_send_command(R_Y_ADDR_AREA, 0);
lcd_send_command(1, 0);
lcd_write_data(&data, 1);
return true;
/* perform a DBOP read */
DBOP_CTRL = (1 << 15) | /* strd=1 (start read) */
(1 << 12) | /* ow=1 (16-bit data width) */
(31 << 0); /* rs_t=31 (read DBOP at end of cycle) */
while ((DBOP_STAT & (1<<16)) == 0);
value = DBOP_DIN;
/* restore previous values */
DBOP_TIMPOL_23 = dbop_timpol23_old;
DBOP_CTRL = dbop_ctrl_old;
return value;
}
/* get the DBOP input value, either directly or cached if DBOP is busy */
unsigned short int lcd_dbop_input(void)
{
if (!lcd_busy) {
dbop_input = lcd_dbop_read();
}
return dbop_input;
}
#endif
/* LCD init */
@ -430,6 +452,8 @@ void lcd_update_rect(int x, int y, int width, int height)
#ifdef SANSA_C200V2
lcd_busy = true;
/* perform a dbop read before doing a potentially lengthy lcd update */
dbop_input = lcd_dbop_read();
#endif
if (width <= 1) {