This patch adds RDS capability to Samsung YP-R0 target.

Uses register polling method to decide when it's time to decode
RDS packets.

Change-Id: I1d3cc995ea3350ec7b101438b8f2027130d4a4c9
Reviewed-on: http://gerrit.rockbox.org/320
Reviewed-by: Lorenzo Miori <memorys60@gmail.com>
Tested-by: Lorenzo Miori <memorys60@gmail.com>
Reviewed-by: Thomas Martitz <kugel@rockbox.org>
Tested-by: Thomas Martitz <kugel@rockbox.org>

2 files changed, 62 insertions, 12 deletions

diff --git a/firmware/export/config/samsungypr0.h b/firmware/export/config/samsungypr0.h
index e97dabcfb2..debe9a3f80 100644
--- a/firmware/export/config/samsungypr0.h
+++ b/firmware/export/config/samsungypr0.h
@@ -18,9 +18,6 @@
 /*TODO: implement USB data transfer management -> see safe mode script and think a way to implemtent it in the code */
 #define USB_NONE
 
-/* There is only USB charging */
-//#define HAVE_USB_POWER
-
 /* define this if you have a bitmap LCD display */
 #define HAVE_LCD_BITMAP
 
@@ -28,7 +25,6 @@
 #define HAVE_LCD_COLOR
 
 /* define this if the LCD needs to be shutdown */
-/* TODO: Our framebuffer must be closed... */
 #define HAVE_LCD_SHUTDOWN
 
 /* define this if you want album art for this target */
@@ -84,7 +80,6 @@
 /* The number of bytes reserved for loadable plugins */
 #define PLUGIN_BUFFER_SIZE 0x100000
 
-/* We can do AB-repeat -> we use User key, our hotkey */
 #define AB_REPEAT_ENABLE
 #define ACTION_WPSAB_SINGLE ACTION_WPS_HOTKEY
 
@@ -93,10 +88,9 @@
 
 /* R0 KeyPad configuration for plugins */
 #define CONFIG_KEYPAD SAMSUNG_YPR0_PAD
-/* It's better to close /dev/r0Btn at shutdown */
 #define BUTTON_DRIVER_CLOSE
 
-/* The YPR0 has a as3534 codec and we use that to control the volume */
+/* The YPR0 has a as3534 codec */
 #define HAVE_AS3514
 #define HAVE_AS3543
 
@@ -105,10 +99,7 @@
 #define CONFIG_TUNER SI4700
 #define HAVE_TUNER_PWR_CTRL
 
-/* TODO: next step: enable RDS
 #define HAVE_RDS_CAP
-#define RDS_ISR_PROCESSING
-*/
 
 /* Define this for FM radio input available */
 #define HAVE_FMRADIO_IN
@@ -154,5 +145,5 @@
 /* Max IMX37 Cpu Frequency */
 /* #define CPUFREQ_MAX         CPU_FREQ */
 
-/* TODO: my idea is to create a folder in the cramfs [/.rockbox], mounting it by the starter script as the current working directory, so no issues of any type keeping the rockbox folder as in all other players */
+/* This folder resides in the ReadOnly CRAMFS. It is binded to /mnt/media0/.rockbox */
 #define BOOTDIR "/.rockbox"
diff --git a/firmware/target/hosted/ypr0/radio-ypr0.c b/firmware/target/hosted/ypr0/radio-ypr0.c
index c3597bd18c..14d56826c1 100644
--- a/firmware/target/hosted/ypr0/radio-ypr0.c
+++ b/firmware/target/hosted/ypr0/radio-ypr0.c
@@ -25,8 +25,12 @@
 #include <sys/ioctl.h>
 #include "stdint.h"
 #include "string.h"
+#include "kernel.h"
 
 #include "radio-ypr0.h"
+#include "rds.h"
+#include "si4700.h"
+#include "power.h"
 
 static int radio_dev = -1;
 
@@ -63,4 +67,59 @@ int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
     (void)address;
     sSi4709_i2c_t r = { .size = count, .buf = buf };
     return ioctl(radio_dev, IOCTL_SI4709_I2C_READ, &r);
-}
\ No newline at end of file
+}
+
+#ifdef HAVE_RDS_CAP
+
+/* Register we are going to poll */
+#define STATUSRSSI  0xA
+#define STATUSRSSI_RDSR     (0x1 << 15)
+
+/* Low-level RDS Support */
+static struct event_queue rds_queue;
+static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];
+static uint16_t rds_data[4];
+
+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 ? 1 : TIMEOUT_BLOCK;
+                break;
+            case SYS_TIMEOUT:
+                /* Captures RDS data and processes it */
+                if ((si4709_read_reg(STATUSRSSI) & STATUSRSSI_RDSR) >> 8) {
+                    if (si4700_rds_read_raw(rds_data) && rds_process(rds_data))
+                        si4700_rds_set_event();
+                }
+                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));
+    rds_init();
+}
+#endif /* HAVE_RDS_CAP */