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-rw-r--r--i2c.c8
1 files changed, 6 insertions, 2 deletions
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);