From 80051bea09fb6a13506bab4b2b712296b1d497db Mon Sep 17 00:00:00 2001
From: George Hotz <george@comma.ai>
Date: Fri, 15 Jun 2018 16:21:53 -0700
Subject: [PATCH] autoretry on chime

---
 board/drivers/canbitbang.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/board/drivers/canbitbang.h b/board/drivers/canbitbang.h
index 77164e26aee390..0e4fe4d411130c 100644
--- a/board/drivers/canbitbang.h
+++ b/board/drivers/canbitbang.h
@@ -137,12 +137,14 @@ void TIM4_IRQHandler(void) {
         puts("ERR: bus driven at ");
         puth(gmlan_sending);
         puts("\n");
-        gmlan_sendmax = -1;   // exit
+        // reset sender (retry after 7 silent)
+        gmlan_silent_count = 0;
+        gmlan_sending = 0;
       } else {
         set_bitbanged_gmlan(pkt_stuffed[gmlan_sending]);
         gmlan_sending++;
       }
-      if (gmlan_sending == gmlan_sendmax || gmlan_sendmax == -1) {
+      if (gmlan_sending == gmlan_sendmax) {
         set_bitbanged_gmlan(1); // recessive
         set_gpio_mode(GPIOB, 13, MODE_INPUT);
         TIM4->DIER = 0;  // no update interrupt