From 2c40f4a0e5c9e9bda8d3b59553abf01abe97c5cd Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Tue, 20 Jan 2015 15:51:50 +0100
Subject: i2c: twRequests returns false if bus is busy

---
 i2c.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'i2c.c')

diff --git a/i2c.c b/i2c.c
index bbee35b..54e1f29 100644
--- a/i2c.c
+++ b/i2c.c
@@ -66,11 +66,15 @@ void twInit () {
 	twr.status = TWST_OK;
 }
 
-/*	high-level write
+/*	high-level write, returns false if bus is busy
  */
 bool twRequest (const twMode mode, const uint8_t address,
 		const uint8_t subaddress, uint8_t * const data, const uint8_t count) {
-	assert (twr.status == TWST_OK);
+	/* busy */
+	if (twr.status != TWST_OK) {
+		return false;
+	}
+
 	assert (count > 0);
 	assert (data != NULL);
 
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