From cc1a95a489924119e3ab372a6d06645c6729e936 Mon Sep 17 00:00:00 2001
From: Yurii Soldak <ysoldak@gmail.com>
Date: Mon, 17 Jan 2022 10:29:48 +0100
Subject: [PATCH] nrf: fix race in i2c

---
 src/machine/machine_nrf.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/machine/machine_nrf.go b/src/machine/machine_nrf.go
index 635e314b..d3a31fbc 100644
--- a/src/machine/machine_nrf.go
+++ b/src/machine/machine_nrf.go
@@ -1,3 +1,4 @@
+//go:build nrf
 // +build nrf
 
 package machine
@@ -284,7 +285,9 @@ func (i2c *I2C) Tx(addr uint16, w, r []byte) (err error) {
 				// To trigger stop task when last byte is received, set before resume task.
 				i2c.Bus.SHORTS.Set(nrf.TWI_SHORTS_BB_STOP)
 			}
-			i2c.Bus.TASKS_RESUME.Set(1) // re-start transmission for reading
+			if i > 0 {
+				i2c.Bus.TASKS_RESUME.Set(1) // re-start transmission for reading
+			}
 			if r[i], err = i2c.readByte(); err != nil {
 				// goto/break are practically equivalent here,
 				// but goto makes this more easily understandable for maintenance.