84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/** esp_iomux.h
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*
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* GPIO functions.
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*
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* Part of esp-open-rtos
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* Copyright (C) 2015 Superhouse Automation Pty Ltd
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef _ESP_GPIO_H
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#include <stdbool.h>
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#include "esp/registers.h"
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#include "esp/iomux.h"
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typedef enum {
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GPIO_INPUT = 0,
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GPIO_OUTPUT = IOMUX_OE,
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GPIO_INPUT_PULLUP = IOMUX_PU,
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} gpio_direction_t;
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/* Enable GPIO on the specified pin, and set it to input/output/ with
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* pullup as needed
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*/
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INLINED void gpio_enable(const uint8_t gpio_num, const gpio_direction_t direction)
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{
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iomux_set_gpio_function(gpio_num, (uint8_t)direction);
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if(direction == GPIO_OUTPUT)
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GPIO_DIR_SET = BIT(gpio_num);
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else
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GPIO_DIR_CLEAR = BIT(gpio_num);
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}
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/* Disable GPIO on the specified pin, and set it Hi-Z.
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*
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* If later muxing this pin to a different function, make sure to set
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* IOMUX_OE if necessary to enable the output buffer.
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*/
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INLINED void gpio_disable(const uint8_t gpio_num)
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{
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GPIO_DIR_CLEAR = BIT(gpio_num);
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*gpio_iomux_reg(gpio_num) &= ~IOMUX_OE;
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}
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/* Set output of a pin high or low.
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*
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* Only works if pin has been set to GPIO_OUTPUT via gpio_enable()
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*/
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INLINED void gpio_write(const uint8_t gpio_num, const uint32_t set)
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{
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if(set)
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GPIO_OUT_SET = BIT(gpio_num);
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else
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GPIO_OUT_CLEAR = BIT(gpio_num);
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}
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/* Toggle output of a pin
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*
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* Only works if pin has been set to GPIO_OUTPUT via gpio_enable()
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*/
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INLINED void gpio_toggle(const uint8_t gpio_num)
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{
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/* Why implement like this instead of GPIO_OUT_REG ^= xxx?
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Concurrency. If an interrupt or higher priority task writes to
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GPIO_OUT between reading and writing, only the gpio_num pin can
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get an invalid value. Prevents one task from clobbering another
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task's pins, without needing to disable/enable interrupts.
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*/
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if(GPIO_OUT_REG & BIT(gpio_num))
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GPIO_OUT_CLEAR = BIT(gpio_num);
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else
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GPIO_OUT_SET = BIT(gpio_num);
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}
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/* Read input value of a GPIO pin.
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*
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* If pin is set as an input, this reads the value on the pin.
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* If pin is set as an output, this reads the last value written to the pin.
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*/
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INLINED bool gpio_read(const uint8_t gpio_num)
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{
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return GPIO_IN_REG & BIT(gpio_num);
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}
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#endif
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