Beginning debug of SAM4L Xplained SLCD

1 files changed, 14 insertions, 9 deletions

diff --git a/nuttx/drivers/net/enc28j60.c b/nuttx/drivers/net/enc28j60.c
index 6b4408f12..b6e265bc2 100644
--- a/nuttx/drivers/net/enc28j60.c
+++ b/nuttx/drivers/net/enc28j60.c
@@ -156,16 +156,21 @@
 
 #define ALIGNED_BUFSIZE ((CONFIG_NET_BUFSIZE + 255) & ~255)
 
-#if 0 /* Fix for Errata #5 */
-#  define PKTMEM_TX_START 0x0000           /* Start TX buffer at 0 */
-#  define PKTMEM_TX_ENDP1 ALIGNED_BUFSIZE  /* Allow TX buffer for one frame */
-#  define PKTMEM_RX_START PKTMEM_TX_ENDP1  /* Followed by RX buffer */
-#  define PKTMEM_RX_END   PKTMEM_END       /* RX buffer goes to the end of SRAM */
+/* Work around Errata #5 (spurious reset of ERXWRPT to 0) by placing the RX
+ * FIFO at the beginning of packet memory.
+ */
+
+#define ERRATA5 1
+#if ERRATA5
+#  define PKTMEM_RX_START 0x0000                            /* RX buffer must be at addr 0 for errata 5 */
+#  define PKTMEM_RX_END   (PKTMEM_END-ALIGNED_BUFSIZE)      /* RX buffer length is total SRAM minus TX buffer */
+#  define PKTMEM_TX_START (PKTMEM_RX_END+1)                 /* Start TX buffer after */
+#  define PKTMEM_TX_ENDP1 (PKTMEM_TX_START+ALIGNED_BUFSIZE) /* Allow TX buffer for one frame */
 #else
-#  define PKTMEM_RX_START 0x0000
-#  define PKTMEM_RX_END   (PKTMEM_END-ALIGNED_BUFSIZE)
-#  define PKTMEM_TX_START (PKTMEM_RX_END+1)
-#  define PKTMEM_TX_ENDP1 (PKTMEM_TX_START+ALIGNED_BUFSIZE)
+#  define PKTMEM_TX_START 0x0000                            /* Start TX buffer at 0 */
+#  define PKTMEM_TX_ENDP1 ALIGNED_BUFSIZE                   /* Allow TX buffer for one frame */
+#  define PKTMEM_RX_START PKTMEM_TX_ENDP1                   /* Followed by RX buffer */
+#  define PKTMEM_RX_END   PKTMEM_END                        /* RX buffer goes to the end of SRAM */
 #endif
 
 /* Misc. Helper Macros ******************************************************/