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fuze+: add RDS support

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I successfully identified the STC/RDS pin as B2P27.
Strangely the OF uses polling instead of interrupts
but since they routed it, let's use it! On the fuze+
the fmradio i2c uses bit toggling so we can't read
the RDS data in the interrupt context. Instead we
defer the work to a thread.

Change-Id: Iedfa425320e6c91b4351b72e97c732696bdb2b73
Reviewed-on: http://gerrit.rockbox.org/236
Reviewed-by: Bertrik Sikken <bertrik@sikken.nl>
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>
This commit is contained in:
Amaury Pouly 2012-05-10 18:29:43 +02:00
parent 2202ed3535
commit 1d21e54fc4
2 changed files with 63 additions and 2 deletions
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5
firmware/export/config/sansafuzeplus.h
View file

@ -77,6 +77,7 @@
#define HAVE_IMX233_CODEC
#define CONFIG_TUNER SI4700
#define HAVE_RDS_CAP
/* There is no hardware tone control */
#define HAVE_SW_TONE_CONTROLS
@ -129,8 +130,8 @@
#define NUM_DRIVES 2
#define HAVE_HOTSWAP
/* Extra threads: touchpad */
#define TARGET_EXTRA_THREADS 1
/* Extra threads: touchpad and rds */
#define TARGET_EXTRA_THREADS 2
/* todo */
#define BATTERY_CAPACITY_DEFAULT 550 /* default battery capacity */

60
firmware/target/arm/imx233/sansa-fuzeplus/fmradio-i2c-fuzeplus.c
View file

@ -24,12 +24,15 @@
#include "fmradio_i2c.h"
#include "pinctrl-imx233.h"
#include "generic_i2c.h"
#include "rds.h"
#include "si4700.h"
/**
* Sansa Fuze+ fmradio uses the following pins:
* - B0P29 as CE apparently (active high)
* - B1P24 as SDA
* - B1P22 as SCL
* - B2P27 as STC/RDS
*/
static int fmradio_i2c_bus = -1;
@ -103,3 +106,60 @@ int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
return i2c_read_data(fmradio_i2c_bus, address, -1, buf, count);
}
#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 */
static void stc_rds_callback(int bank, int pin)
{
(void) bank;
(void) pin;
semaphore_release(&rds_sema);
}
/* 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();
/* renable callback */
imx233_setup_pin_irq(2, 27, true, true, false, &stc_rds_callback);
}
}
/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
if(on)
{
imx233_pinctrl_acquire_pin(2, 27, "tuner stc/rds");
imx233_set_pin_function(2, 27, PINCTRL_FUNCTION_GPIO);
imx233_enable_gpio_output(2, 27, false);
/* pin is set to 0 when an RDS packet has arrived */
imx233_setup_pin_irq(2, 27, true, true, false, &stc_rds_callback);
}
else
{
imx233_setup_pin_irq(2, 27, false, false, false, NULL);
imx233_pinctrl_release_pin(2, 27, "tuner stc/rds");
}
}
/* 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 */