Add handler for audio irq.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25299 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 12 insertions, 0 deletions

diff --git a/firmware/target/arm/adc-as3514.c b/firmware/target/arm/adc-as3514.c
index 9c2a421441..77d65455fb 100644
--- a/firmware/target/arm/adc-as3514.c
+++ b/firmware/target/arm/adc-as3514.c
@@ -37,6 +37,18 @@ unsigned short adc_read(int channel)
         {
             unsigned char buf[2];
 
+            /*
+             * The AS3514 ADC will trigger an interrupt when the conversion
+             * is finished, if the corresponding enable bit in IRQ_ENRD2
+             * is set.
+             * Previously the code did not wait and this apparently did
+             * not pose any problems, but this should be more correct.
+             * Without the wait the data read back may be completely or
+             * partially (first one of the two bytes) stale.
+             */
+            ascodec_wait_adc_finished();
+
+
             /* Read data */
             if (ascodec_readbytes(AS3514_ADC_0, 2, buf) >= 0)
             {