Do not allow a *io object to be used after deinit().

Fixes #278, #277, #276, #275.

2 files changed, 11 insertions, 0 deletions

diff --git a/shared-module/busio/I2C.c b/shared-module/busio/I2C.c
index f8f154e7f..68d6ea22a 100644
--- a/shared-module/busio/I2C.c
+++ b/shared-module/busio/I2C.c
@@ -34,6 +34,10 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
     shared_module_bitbangio_i2c_construct(&self->bitbang, scl, sda, freq);
 }
 
+bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
+    return shared_module_bitbangio_i2c_deinited(&self->bitbang);
+}
+
 void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
     shared_module_bitbangio_i2c_deinit(&self->bitbang);
 }
diff --git a/shared-module/busio/OneWire.c b/shared-module/busio/OneWire.c
index 73d3d29d7..6bb7dedcd 100644
--- a/shared-module/busio/OneWire.c
+++ b/shared-module/busio/OneWire.c
@@ -34,7 +34,14 @@ void common_hal_busio_onewire_construct(busio_onewire_obj_t* self,
     shared_module_bitbangio_onewire_construct(&self->bitbang, pin);
 }
 
+bool common_hal_busio_onewire_deinited(busio_onewire_obj_t* self) {
+    return shared_module_bitbangio_onewire_deinited(&self->bitbang);
+}
+
 void common_hal_busio_onewire_deinit(busio_onewire_obj_t* self) {
+    if (common_hal_busio_onewire_deinited(self)) {
+        return;
+    }
     shared_module_bitbangio_onewire_deinit(&self->bitbang);
 }