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FS#12370: Initial RDS support for Si4701/Si4703 tuner (beast and clip zip)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31346 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2011-12-17 20:24:19 +00:00
parent 17ed3253fc
commit 8c19dcd598
13 changed files with 525 additions and 37 deletions
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59
firmware/target/arm/as3525/fmradio-i2c-as3525.c
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@ -27,10 +27,14 @@
I2C with a couple of GPIO pins.
*/
#include "config.h"
#include "as3525.h"
#include "system.h"
#include "tuner.h"
#include "generic_i2c.h"
#include "fmradio_i2c.h"
#include "thread.h"
#include "rds.h"
#if defined(SANSA_CLIP) || defined(SANSA_C200V2)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
@ -179,3 +183,58 @@ int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
#endif
return ret;
}
#ifdef HAVE_RDS_CAP
/* Low-level RDS Support */
static struct semaphore rds_sema;
static uint32_t rds_stack[DEFAULT_STACK_SIZE/sizeof(uint32_t)];
/* RDS GPIO interrupt handler */
void tuner_isr(void)
{
/* read and clear the interrupt */
if (GPIOA_MIS & (1<<4)) {
semaphore_release(&rds_sema);
}
GPIOA_IC = (1<<4);
}
/* Captures RDS data and processes it */
static void NORETURN_ATTR rds_thread(void)
{
uint16_t rds_data[4];
while (true) {
semaphore_wait(&rds_sema, TIMEOUT_BLOCK);
if (si4700_rds_read_raw(rds_data) && rds_process(rds_data)) {
si4700_rds_set_event();
}
}
}
/* Called with on=true after full radio power up, and with on=false before
powering down */
void si4700_rds_powerup(bool on)
{
GPIOA_IE &= ~(1<<4); /* disable GPIO interrupt */
if (on) {
GPIOA_DIR &= ~(1<<4); /* input */
GPIOA_IS &= ~(1<<4); /* edge detect */
GPIOA_IBE &= ~(1<<4); /* only one edge */
GPIOA_IEV &= ~(1<<4); /* falling edge */
GPIOA_IC = (1<<4); /* clear any pending interrupt */
GPIOA_IE |= (1<<4); /* enable GPIO interrupt */
}
}
/* One-time RDS init at startup */
void si4700_rds_init(void)
{
semaphore_init(&rds_sema, 1, 0);
rds_init();
create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
IF_PRIO(, PRIORITY_REALTIME) IF_COP(, CPU));
}
#endif /* HAVE_RDS_CAP */