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H300 FM radio support, with help from Peter D'Hoye

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8237 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-12-15 01:11:19 +00:00
parent c3387e545d
commit a4b15a4f1f
6 changed files with 61 additions and 18 deletions
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50
firmware/drivers/fmradio_i2c.c
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@ -30,18 +30,38 @@
/* cute little functions, atomic read-modify-write */
/* SDA is GPIO1,23 */
#define SDA_LO and_l(~0x00800000, &GPIO1_OUT) // and_b(~0x10, &PBDRL)
#define SDA_HI or_l( 0x00800000, &GPIO1_OUT) // or_b( 0x10, &PBDRL)
#define SDA_INPUT and_l(~0x00800000, &GPIO1_ENABLE) // and_b(~0x10, &PBIORL)
#define SDA_OUTPUT or_l( 0x00800000, &GPIO1_ENABLE) // or_b( 0x10, &PBIORL)
#define SDA ( 0x00800000 & GPIO1_READ) // (PBDR & 0x0010)
#ifdef IRIVER_H300_SERIES
/* SCL is GPIO, 3 */
#define SCL_INPUT and_l(~0x00000008, &GPIO_ENABLE) // and_b(~0x02, &PBIORL)
#define SCL_OUTPUT or_l( 0x00000008, &GPIO_ENABLE) // or_b( 0x02, &PBIORL)
#define SCL_LO and_l(~0x00000008, &GPIO_OUT) // and_b(~0x02, &PBDRL)
#define SCL_HI or_l( 0x00000008, &GPIO_OUT) // or_b( 0x02, &PBDRL)
#define SCL ( 0x00000008 & GPIO_READ) // (PBDR & 0x0002)
/* SDA is GPIO57 */
#define SDA_LO and_l(~0x02000000, &GPIO1_OUT)
#define SDA_HI or_l( 0x02000000, &GPIO1_OUT)
#define SDA_INPUT and_l(~0x02000000, &GPIO1_ENABLE)
#define SDA_OUTPUT or_l( 0x02000000, &GPIO1_ENABLE)
#define SDA ( 0x02000000 & GPIO1_READ)
/* SCL is GPIO56 */
#define SCL_INPUT and_l(~0x01000000, &GPIO1_ENABLE)
#define SCL_OUTPUT or_l( 0x01000000, &GPIO1_ENABLE)
#define SCL_LO and_l(~0x01000000, &GPIO1_OUT)
#define SCL_HI or_l( 0x01000000, &GPIO1_OUT)
#define SCL ( 0x01000000 & GPIO1_READ)
#else
/* SDA is GPIO55 */
#define SDA_LO and_l(~0x00800000, &GPIO1_OUT)
#define SDA_HI or_l( 0x00800000, &GPIO1_OUT)
#define SDA_INPUT and_l(~0x00800000, &GPIO1_ENABLE)
#define SDA_OUTPUT or_l( 0x00800000, &GPIO1_ENABLE)
#define SDA ( 0x00800000 & GPIO1_READ)
/* SCL is GPIO3 */
#define SCL_INPUT and_l(~0x00000008, &GPIO_ENABLE)
#define SCL_OUTPUT or_l( 0x00000008, &GPIO_ENABLE)
#define SCL_LO and_l(~0x00000008, &GPIO_OUT)
#define SCL_HI or_l( 0x00000008, &GPIO_OUT)
#define SCL ( 0x00000008 & GPIO_READ)
#endif
/* delay loop to achieve 400kHz at 120MHz CPU frequency */
#define DELAY do { int _x; for(_x=0;_x<22;_x++);} while(0)
@ -84,8 +104,8 @@ static void fmradio_i2c_ack(void)
SCL_INPUT; /* Set the clock to input */
while(!SCL) /* and wait for the slave to release it */
{
SCL_OUTPUT; /* Set the clock to output */
SCL_HI;
SCL_OUTPUT; /* Set the clock to output */
SCL_INPUT; /* Set the clock to input */
DELAY;
}
@ -111,8 +131,8 @@ static int fmradio_i2c_getack(void)
SCL_INPUT; /* Set the clock to input */
while(!SCL) /* and wait for the slave to release it */
{
SCL_OUTPUT; /* Set the clock to output */
SCL_HI;
SCL_OUTPUT; /* Set the clock to output */
SCL_INPUT; /* Set the clock to input */
DELAY;
}
@ -160,10 +180,12 @@ static unsigned char fmradio_i2c_inb(void)
/* clock in each bit, MSB first */
for ( i=0x80; i; i>>=1 ) {
SDA_INPUT; /* And set to input */
SCL_HI;
DELAY;
DELAY;
if ( SDA )
byte |= i;
SCL_HI;
DELAY;
SCL_LO;
DELAY;
SDA_OUTPUT;