From 7b596416bf2cf533a514b4d1f7b95c6de6efa7d5 Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Thu, 29 Dec 2011 12:02:49 +0000
Subject: Gigabeat S: Update RDS processing to use asynchronous I2C rather than
 thread.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31462 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/rds.c          | 39 +++++++++++++++++++++++++++++++++++++--
 firmware/drivers/tuner/si4700.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 2 deletions(-)

(limited to 'firmware/drivers')

diff --git a/firmware/drivers/rds.c b/firmware/drivers/rds.c
index 09bc33807c..828c28b672 100644
--- a/firmware/drivers/rds.c
+++ b/firmware/drivers/rds.c
@@ -36,14 +36,46 @@ static char rt_copy[65];
 static int rt_segment;
 static int rt_abflag;
 
+#ifdef SI4700_RDS_ASYNC
+/* Functions are called in ISR context */
+#define rds_disable_irq_save() disable_irq_save()
+#define rds_restore_irq(old) restore_irq(old)
+/* Need triple buffer so string isn't clobbered while caller is using it */
+static inline char * get_ps(void)
+{
+    static char ps_out[9];
+    int oldlevel = rds_disable_irq_save();
+    strcpy(ps_out, ps_copy);
+    rds_restore_irq(oldlevel);
+    return ps_out;
+}
+static inline char * get_rt(void)
+{
+    static char rt_out[65];
+    int oldlevel = rds_disable_irq_save();
+    strcpy(rt_out, rt_copy);
+    rds_restore_irq(oldlevel);
+    return rt_out;
+}
+#else /* ndef SI4700_RDS_ASYNC */
+#define rds_disable_irq_save() 0
+#define rds_restore_irq(old) ((void)(old))
+static inline char * get_ps(void) { return ps_copy; }
+static inline char * get_rt(void) { return rt_copy; }
+#endif /* SI4700_RDS_ASYNC */
+
 /* resets the rds parser */
 void rds_reset(void)
 {
+    int oldlevel = rds_disable_irq_save();
+
     ps_copy[0] = '\0';
     ps_segment = 0;
     rt_copy[0] = '\0';
     rt_segment = 0;
     pi = 0;
+
+    rds_restore_irq(oldlevel);
 }
 
 /* initialises the rds parser */
@@ -172,6 +204,9 @@ bool rds_process(uint16_t data[4])
     return false;
 }
 
+/* TODO: The caller really should provide the buffer in order to regulate
+   access */
+
 /* returns the programme identification code */
 uint16_t rds_get_pi(void)
 {
@@ -181,12 +216,12 @@ uint16_t rds_get_pi(void)
 /* returns the most recent valid programme service name */
 char* rds_get_ps(void)
 {
-    return ps_copy;
+    return get_ps();
 }
 
 /* returns the most recent valid RadioText message */
 char* rds_get_rt(void)
 {
-    return rt_copy;
+    return get_rt();
 }
 
diff --git a/firmware/drivers/tuner/si4700.c b/firmware/drivers/tuner/si4700.c
index bebbd0c881..0684d2042f 100644
--- a/firmware/drivers/tuner/si4700.c
+++ b/firmware/drivers/tuner/si4700.c
@@ -556,6 +556,34 @@ void si4700_dbg_info(struct si4700_dbg_info *nfo)
 }
 
 #ifdef HAVE_RDS_CAP
+
+#ifdef SI4700_RDS_ASYNC
+/* Read raw RDS info for processing - asynchronously */
+
+/* Assumes regbuf is 32 bytes */
+void si4700_rds_read_raw_async(void)
+{
+    si4700_read_raw_async((RDSD - STATUSRSSI + 1) * 2);
+}
+
+void si4700_rds_read_raw_async_complete(unsigned char *regbuf,
+                                        uint16_t data[4])
+{
+    const int index = (RDSA - STATUSRSSI) * 2;
+
+    for (int i = 0; i < 4; i++) {
+        data[i] = regbuf[index] << 8 | regbuf[index + 1];
+        regbuf += 2;
+    }
+}
+
+/* Set the event flag */
+void si4700_rds_set_event(void)
+{
+    rds_event = 1;
+}
+
+#else
 /* Read raw RDS info for processing */
 bool si4700_rds_read_raw(uint16_t data[4])
 {
@@ -582,6 +610,7 @@ void si4700_rds_set_event(void)
     rds_event = 1;
     mutex_unlock(&fmr_mutex);
 }
+#endif /* SI4700_RDS_ASYNC */
 
 char * si4700_get_rds_info(int setting)
 {
-- 
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