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

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

3 files changed, 22 insertions, 0 deletions

diff --git a/shared-module/bitbangio/I2C.c b/shared-module/bitbangio/I2C.c
index 0f017fc18..7eeda0e00 100644
--- a/shared-module/bitbangio/I2C.c
+++ b/shared-module/bitbangio/I2C.c
@@ -162,7 +162,15 @@ void shared_module_bitbangio_i2c_construct(bitbangio_i2c_obj_t *self,
     stop(self);
 }
 
+bool shared_module_bitbangio_i2c_deinited(bitbangio_i2c_obj_t *self) {
+    // If one is deinited, both will be.
+    return common_hal_digitalio_digitalinout_deinited(&self->scl);
+}
+
 void shared_module_bitbangio_i2c_deinit(bitbangio_i2c_obj_t *self) {
+    if (shared_module_bitbangio_i2c_deinited(self)) {
+        return;
+    }
     common_hal_digitalio_digitalinout_deinit(&self->scl);
     common_hal_digitalio_digitalinout_deinit(&self->sda);
 }
diff --git a/shared-module/bitbangio/OneWire.c b/shared-module/bitbangio/OneWire.c
index 46c0c406c..e77bdb3b2 100644
--- a/shared-module/bitbangio/OneWire.c
+++ b/shared-module/bitbangio/OneWire.c
@@ -38,7 +38,14 @@ void shared_module_bitbangio_onewire_construct(bitbangio_onewire_obj_t* self,
     common_hal_digitalio_digitalinout_construct(&self->pin, pin);
 }
 
+bool shared_module_bitbangio_onewire_deinited(bitbangio_onewire_obj_t* self) {
+    return common_hal_digitalio_digitalinout_deinited(&self->pin);
+}
+
 void shared_module_bitbangio_onewire_deinit(bitbangio_onewire_obj_t* self) {
+    if (shared_module_bitbangio_onewire_deinited(self)) {
+        return;
+    }
     common_hal_digitalio_digitalinout_deinit(&self->pin);
 }
 
diff --git a/shared-module/bitbangio/SPI.c b/shared-module/bitbangio/SPI.c
index a3c70dde9..0576a6e56 100644
--- a/shared-module/bitbangio/SPI.c
+++ b/shared-module/bitbangio/SPI.c
@@ -70,7 +70,14 @@ void shared_module_bitbangio_spi_construct(bitbangio_spi_obj_t *self,
     self->phase = 0;
 }
 
+bool shared_module_bitbangio_spi_deinited(bitbangio_spi_obj_t *self) {
+    return common_hal_digitalio_digitalinout_deinited(&self->clock);
+}
+
 void shared_module_bitbangio_spi_deinit(bitbangio_spi_obj_t *self) {
+    if (shared_module_bitbangio_spi_deinited(self)) {
+        return;
+    }
     common_hal_digitalio_digitalinout_deinit(&self->clock);
     if (self->has_mosi) {
         common_hal_digitalio_digitalinout_deinit(&self->mosi);