1 files changed, 105 insertions, 0 deletions
diff --git a/circuitpython/ports/raspberrypi/common-hal/microcontroller/Pin.c b/circuitpython/ports/raspberrypi/common-hal/microcontroller/Pin.c
new file mode 100644
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+++ b/circuitpython/ports/raspberrypi/common-hal/microcontroller/Pin.c
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+
+#include "common-hal/microcontroller/__init__.h"
+#include "shared-bindings/microcontroller/Pin.h"
+
+#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
+
+STATIC uint32_t never_reset_pins;
+
+void reset_all_pins(void) {
+    for (size_t i = 0; i < TOTAL_GPIO_COUNT; i++) {
+        if ((never_reset_pins & (1 << i)) != 0) {
+            continue;
+        }
+        reset_pin_number(i);
+    }
+}
+
+void never_reset_pin_number(uint8_t pin_number) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
+        return;
+    }
+
+    never_reset_pins |= 1 << pin_number;
+}
+
+void reset_pin_number(uint8_t pin_number) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
+        return;
+    }
+
+    never_reset_pins &= ~(1 << pin_number);
+
+    // We are very aggressive in shutting down the pad fully. Both pulls are
+    // disabled and both buffers are as well.
+    gpio_init(pin_number);
+    hw_clear_bits(&padsbank0_hw->io[pin_number], PADS_BANK0_GPIO0_IE_BITS |
+        PADS_BANK0_GPIO0_PUE_BITS |
+        PADS_BANK0_GPIO0_PDE_BITS);
+    hw_set_bits(&padsbank0_hw->io[pin_number], PADS_BANK0_GPIO0_OD_BITS);
+}
+
+void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
+    never_reset_pin_number(pin->number);
+}
+
+void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
+    reset_pin_number(pin->number);
+}
+
+void claim_pin(const mcu_pin_obj_t *pin) {
+    // Nothing to do because all changes will set the GPIO settings.
+}
+
+bool pin_number_is_free(uint8_t pin_number) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
+        return false;
+    }
+
+    uint32_t pad_state = padsbank0_hw->io[pin_number];
+    return (pad_state & PADS_BANK0_GPIO0_IE_BITS) == 0 &&
+           (pad_state & PADS_BANK0_GPIO0_OD_BITS) != 0;
+}
+
+bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
+    return pin_number_is_free(pin->number);
+}
+
+uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
+    return pin->number;
+}
+
+void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
+    return claim_pin(pin);
+}
+
+void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
+    reset_pin_number(pin_no);
+}