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Sansa Clip+: add RDS support

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Based on a patch by Amaury Pouly which was based on a patch from Ryan
Hitchman.

I mainly moved the code for polling into the tuner driver so it can be
reused by other targets. I added the CONFIG parameter for the polling
frequency (in ticks) to save energy. Also, I did some minor cleanups.

Change-Id: I95a62e7e1e42c62dbf47ecb27a3b312a42be62aa
This commit is contained in:
Wolfram Sang 2021-11-15 20:46:28 +01:00 • committed by Solomon Peachy
parent 701d4ba77e
commit de0346065b
6 changed files with 76 additions and 2 deletions
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55
firmware/drivers/tuner/si4700.c
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@ -587,12 +587,67 @@ void si4700_rds_process(void)
if (tuner_powered())
{
si4700_read_reg(RDSD);
#if (CONFIG_RDS & RDS_CFG_POLL)
/* we need to keep track of the ready bit because it stays set for 80ms
* and we must avoid processing it twice */
static bool old_rdsr = false;
bool rdsr = (cache[STATUSRSSI] & STATUSRSSI_RDSR);
if (rdsr && !old_rdsr)
rds_process(&cache[RDSA]);
old_rdsr = rdsr;
#else
rds_process(&cache[RDSA]);
#endif /* !(CONFIG_RDS & RDS_CFG_POLL) */
}
mutex_unlock(&fmr_mutex);
}
#endif /* (CONFIG_RDS & RDS_CFG_ISR) */
#if (CONFIG_RDS & RDS_CFG_POLL)
static struct event_queue rds_queue;
static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];
enum {
Q_POWERUP,
};
static void NORETURN_ATTR rds_thread(void)
{
/* start up frozen */
int timeout = TIMEOUT_BLOCK;
struct queue_event ev;
while (true) {
queue_wait_w_tmo(&rds_queue, &ev, timeout);
switch (ev.id) {
case Q_POWERUP:
/* power up: timeout after 1 tick, else block indefinitely */
timeout = ev.data ? CONFIG_RDS_POLL_TICKS : TIMEOUT_BLOCK;
break;
case SYS_TIMEOUT:;
/* Captures RDS data and processes it */
si4700_rds_process();
break;
}
}
}
/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
queue_post(&rds_queue, Q_POWERUP, on);
}
/* One-time RDS init at startup */
void si4700_rds_init(void)
{
queue_init(&rds_queue, false);
create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));
}
#endif /* !(CONFIG_RDS & RDS_CFG_POLL) */
#endif /* HAVE_RDS_CAP */