Fix caching buffer for tx and rx when slice len==2.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@5095 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/cortex-m3/drv/i2s_sam3.c b/bertos/cpu/cortex-m3/drv/i2s_sam3.c
index 5a5ba13e193ed40cf8c9ced9ea77260ce978d91f..bfd579345b3009ede25c7229c3f890e4c83b54da 100644 (file)
--- a/bertos/cpu/cortex-m3/drv/i2s_sam3.c
+++ b/bertos/cpu/cortex-m3/drv/i2s_sam3.c
@@ -58,7 +58,7 @@
 #include <string.h>
 
 
-#define I2S_DMAC_CH    3
+#define I2S_DMAC_CH    0
 #define I2S_CACHED_CHUNK_SIZE 2
 
 
@@ -142,7 +142,6 @@ static void sam3_i2s_txStop(I2s *i2s)
 
        i2s_status |= I2S_STATUS_END_TX;
        i2s_status &= ~I2S_STATUS_TX;
-
        event_do(&data_ready);
 }
 
@@ -234,9 +233,11 @@ static void sam3_i2s_txStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
                remaing_size -= chunk_size;
                next_idx += chunk_size;
 
-               if (chunk_size >= remaing_size)
-                       break;
-
+               if (remaing_size <= 0)
+               {
+                       remaing_size = transfer_size;
+                       next_idx = 0;
+               }
        }
 
        dmac_setLLITransfer(I2S_DMAC_CH, prev, I2S_TX_DMAC_CFG);
@@ -339,8 +340,11 @@ static void sam3_i2s_rxStart(I2s *i2s, void *buf, size_t len, size_t slice_len)
                remaing_size -= chunk_size;
                next_idx += chunk_size;
 
-               if (chunk_size >= remaing_size)
-                       break;
+               if (remaing_size <= 0)
+               {
+                       remaing_size = transfer_size;
+                       next_idx = 0;
+               }
        }
 
        dmac_setLLITransfer(I2S_DMAC_CH, prev, I2S_RX_DMAC_CFG);