1 files changed, 121 insertions, 0 deletions
diff --git a/libmaple/include/libmaple/gpio.h b/libmaple/include/libmaple/gpio.h
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+++ b/libmaple/include/libmaple/gpio.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ * Copyright (c) 2011, 2012 LeafLabs, LLC.
+ *
+ * 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.
+*****************************************************************************/
+
+/**
+ * @file libmaple/include/libmaple/gpio.h
+ * @brief General Purpose I/O (GPIO) interace.
+ */
+
+#ifndef _LIBMAPLE_GPIO_H_
+#define _LIBMAPLE_GPIO_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+/*
+ * Note: Series header must define:
+ * - enum gpio_pin_mode (TODO think harder about portability here)
+ */
+#include <series/gpio.h>
+#include <libmaple/libmaple_types.h>
+#include <libmaple/rcc.h>
+#include <libmaple/exti.h>
+
+/*
+ * Device type
+ */
+
+/** GPIO device type */
+typedef struct gpio_dev {
+    gpio_reg_map *regs;         /**< Register map */
+    rcc_clk_id    clk_id;       /**< RCC clock information */
+    /**
+     * @brief (Deprecated) External interrupt port.
+     * Instead of dev->exti_port, use gpio_exti_port(dev).
+     */
+    exti_cfg      exti_port;
+} gpio_dev;
+
+/*
+ * Portable routines
+ */
+
+void gpio_init(gpio_dev *dev);
+void gpio_init_all(void);
+/* TODO flags argument version? */
+void gpio_set_mode(gpio_dev *dev, uint8 pin, gpio_pin_mode mode);
+
+/**
+ * @brief Get a GPIO port's corresponding EXTI port configuration.
+ * @param dev GPIO port whose exti_cfg to return.
+ */
+static inline exti_cfg gpio_exti_port(gpio_dev *dev) {
+    return (exti_cfg)(EXTI_PA + (dev->clk_id - RCC_GPIOA));
+}
+
+/**
+ * Set or reset a GPIO pin.
+ *
+ * Pin must have previously been configured to output mode.
+ *
+ * @param dev GPIO device whose pin to set.
+ * @param pin Pin on to set or reset
+ * @param val If true, set the pin.  If false, reset the pin.
+ */
+static inline void gpio_write_bit(gpio_dev *dev, uint8 pin, uint8 val) {
+    val = !val;          /* "set" bits are lower than "reset" bits  */
+    dev->regs->BSRR = (1U << pin) << (16 * val);
+}
+
+/**
+ * Determine whether or not a GPIO pin is set.
+ *
+ * Pin must have previously been configured to input mode.
+ *
+ * @param dev GPIO device whose pin to test.
+ * @param pin Pin on dev to test.
+ * @return True if the pin is set, false otherwise.
+ */
+static inline uint32 gpio_read_bit(gpio_dev *dev, uint8 pin) {
+    return dev->regs->IDR & (1U << pin);
+}
+
+/**
+ * Toggle a pin configured as output push-pull.
+ * @param dev GPIO device.
+ * @param pin Pin on dev to toggle.
+ */
+static inline void gpio_toggle_bit(gpio_dev *dev, uint8 pin) {
+    dev->regs->ODR = dev->regs->ODR ^ (1U << pin);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif