From 6cbaed75c8f938a1dd1ae657b11adaeff7077c3e Mon Sep 17 00:00:00 2001
From: Kenneth Bell <ken@netleap.io>
Date: Thu, 25 Nov 2021 22:03:55 +0000
Subject: [PATCH] stm32: fix timeout for i2c comms

ticks changed to 16ns causing timeouts to be very, very short.  This change updates timeouts for 16ns ticks.
---
 src/machine/machine_stm32_i2c_revb.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/machine/machine_stm32_i2c_revb.go b/src/machine/machine_stm32_i2c_revb.go
index aca96240..a265c602 100644
--- a/src/machine/machine_stm32_i2c_revb.go
+++ b/src/machine/machine_stm32_i2c_revb.go
@@ -1,3 +1,4 @@
+//go:build stm32l5 || stm32f7 || stm32l4 || stm32l0
 // +build stm32l5 stm32f7 stm32l4 stm32l0
 
 package machine
@@ -27,7 +28,10 @@ const (
 
 const (
 	MAX_NBYTE_SIZE = 255
-	TIMEOUT_TICKS  = 100 // 100ms
+
+	// 100ms delay = 100e6ns / 16ns
+	// In runtime_stm32_timers.go, tick is fixed at 16ns per tick
+	TIMEOUT_TICKS = 100e6 / 16
 
 	I2C_NO_STARTSTOP         = 0x0
 	I2C_GENERATE_START_WRITE = 0x80000000 | stm32.I2C_CR2_START