1 files changed, 81 insertions, 0 deletions
diff --git a/ports/stm32f4/common-hal/microcontroller/Pin.c b/ports/stm32f4/common-hal/microcontroller/Pin.c
new file mode 100644
index 000000000..6bfe56515
--- /dev/null
+++ b/ports/stm32f4/common-hal/microcontroller/Pin.c
@@ -0,0 +1,81 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ * Copyright (c) 2019 Lucian Copeland 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 "shared-bindings/microcontroller/Pin.h"
+
+#include "py/mphal.h"
+#include "stm32f4/pins.h"
+#include "stm32f4xx_hal.h"
+
+#define GPIO_PORT_COUNT 5
+
+STATIC uint16_t claimed_pins[GPIO_PORT_COUNT];
+STATIC uint16_t never_reset_pins[GPIO_PORT_COUNT];
+GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE};
+
+void reset_all_pins(void) {
+    // Reset claimed pins
+    for (uint8_t i = 0; i < GPIO_PORT_COUNT; i++) {
+        claimed_pins[i] = never_reset_pins[i];
+    }
+    for (uint8_t i = 0; i < GPIO_PORT_COUNT; i++) {
+        HAL_GPIO_DeInit(ports[i], ~never_reset_pins[i]);
+    }
+}
+
+// Mark pin as free and return it to a quiescent state.
+void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
+    if (pin_number == NO_PIN) {
+        return;
+    }
+
+    // Clear claimed bit.
+    claimed_pins[pin_port] &= ~(1 << pin_number);
+    // Reset the pin
+    HAL_GPIO_DeInit(ports[pin_port], (1 << pin_number));
+}
+
+
+void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
+    never_reset_pins[pin_port] |= 1 << pin_number;
+}
+
+void claim_pin(const mcu_pin_obj_t* pin) {
+    // Set bit in claimed_pins bitmask.
+    claimed_pins[pin->port_number] |= 1 << pin->number;
+}
+
+
+bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
+    return !(claimed_pins[pin_port] & (1 << pin_number));
+}
+
+bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
+
+    return pin_number_is_free(pin->port_number, pin->number);
+
+}