Improve radio RDS driver and framework

* Remove unused bits like the radio event and simplify basic
radio interface. It can be more self-contained with rds.h only
required by radio and tuner code.

* Add post-processing to text a-la Silicon Labs AN243. The chip's
error correction can only do so much; additional checks are highly
recommended. Simply testing for two identical messages in a row
is extremely effective and I've never seen corrupted text since
doing that, even with mediocre reception.

Groups segments must arrive in order, not randomly; logic change
only accepts them in order, starting at 0.

Time readout was made a bit better but really we'd need to use
verbose mode and ensure that no errors were seen during receiving
of time and more checks would be need to have a stable PI. The
text is the important bit anyway.

* Time out of stale text.

* Text is no longer updated until a complete group has been
received, as is specified in the standard. Perhaps go back to
scrolling text lines in the radio screen?

* Add proper character conversion to UTF-8. Only the default G0
table for the moment. The other two could be added in.

* Add variants "RDS_CFG_PROCESS" and "RDS_CFG_PUSH" to allow
the option for processed RDS data to be pushed to the driver and
still do proper post-processing (only text conversion for now for
the latter).

Change-Id: I4d83f8b2e89a209a5096d15ec266477318c66925

1 files changed, 4 insertions, 2 deletions

diff --git a/apps/gui/skin_engine/skin_tokens.c b/apps/gui/skin_engine/skin_tokens.c
index c07d4cf2df..cbf732fe10 100644
--- a/apps/gui/skin_engine/skin_tokens.c
+++ b/apps/gui/skin_engine/skin_tokens.c
@@ -540,9 +540,11 @@ const char *get_radio_token(struct wps_token *token, int preset_offset,
 #ifdef HAVE_RDS_CAP
             return "rds";
         case SKIN_TOKEN_RDS_NAME:
-            return tuner_get_rds_info(RADIO_RDS_NAME);
+            tuner_get_rds_info(RADIO_RDS_NAME, buf, buf_size);
+            return buf;
         case SKIN_TOKEN_RDS_TEXT:
-            return tuner_get_rds_info(RADIO_RDS_TEXT);
+            tuner_get_rds_info(RADIO_RDS_TEXT, buf, buf_size);
+            return buf;
 #else
             return NULL; /* end of the SKIN_TOKEN_HAVE_RDS case */
 #endif /* HAVE_RDS_CAP */