extmod/machine_i2c: Release SDA on bus error

deshipu · dpgeorge · commit e81a5353cb79 · 2016-11-17T12:43:13.000+11:00
diff --git a/extmod/machine_i2c.c b/extmod/machine_i2c.c
@@ -117,6 +117,7 @@ STATIC int mp_hal_i2c_write_byte(machine_i2c_obj_t *self, uint8_t val) {
         }
         mp_hal_i2c_delay(self);
         if (!mp_hal_i2c_scl_release(self)) {
+            mp_hal_i2c_sda_release(self);
             return 0; // failure
         }
         mp_hal_i2c_scl_low(self);
@@ -157,6 +158,7 @@ STATIC int mp_hal_i2c_read_byte(machine_i2c_obj_t *self, uint8_t *val, int nack)
     }
     mp_hal_i2c_delay(self);
     if (!mp_hal_i2c_scl_release(self)) {
+        mp_hal_i2c_sda_release(self);
         return 0; // failure
     }
     mp_hal_i2c_scl_low(self);

Original file line number	Diff line number	Diff line change
`@@ -117,6 +117,7 @@ STATIC int mp_hal_i2c_write_byte(machine_i2c_obj_t *self, uint8_t val) {`
`117`	`117`	`}`
`118`	`118`	`mp_hal_i2c_delay(self);`
`119`	`119`	`if (!mp_hal_i2c_scl_release(self)) {`
	`120`	`+ mp_hal_i2c_sda_release(self);`
`120`	`121`	`return 0; // failure`
`121`	`122`	`}`
`122`	`123`	`mp_hal_i2c_scl_low(self);`
`@@ -157,6 +158,7 @@ STATIC int mp_hal_i2c_read_byte(machine_i2c_obj_t self, uint8_t val, int nack)`
`157`	`158`	`}`
`158`	`159`	`mp_hal_i2c_delay(self);`
`159`	`160`	`if (!mp_hal_i2c_scl_release(self)) {`
	`161`	`+ mp_hal_i2c_sda_release(self);`
`160`	`162`	`return 0; // failure`
`161`	`163`	`}`
`162`	`164`	`mp_hal_i2c_scl_low(self);`