From 4e2e5d88bce6a9e81ca2d3424a97b1de5d19281b Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Wed, 20 Jun 2012 22:44:10 +0200
Subject: mcp2515: clear RTS after TX error

---
 can.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/can.c b/can.c
index 16b66a0..5cc879a 100644
--- a/can.c
+++ b/can.c
@@ -191,13 +191,22 @@ static void can_int(void)
 	if (canintf & 0x80 || canintf & 0x04) {
 		uint8_t txb0ctrl;
 		spi_ss(0);
-		spi_wrrd(0x03);
-		spi_wrrd(0x30);
+		spi_wrrd(MCP2515_READ);
+		spi_wrrd(A_TXB0CTRL);
 		txb0ctrl = spi_wrrd(0xff);
 		spi_ss(1);
 		uart_puts("can: TXB0CTRL ");
 		uart_puthex(txb0ctrl);
 		uart_puts("\n");
+
+		/* clear RTS */
+		if (txb0ctrl & 0x08) {
+			spi_ss(0);
+			spi_wrrd(MCP2515_WRITE);
+			spi_wrrd(A_TXB0CTRL);
+			spi_wrrd(0x00);
+			spi_ss(1);
+		}
 	}
 	if (canintf & 0x01)
 		can_rxh(0);
-- 
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