130 lines
3.6 KiB
C
130 lines
3.6 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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#define _ESP_GPIO_H
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#include <stdbool.h>
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#include "esp/gpio_regs.h"
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#include "esp/iomux.h"
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#include "esp/cpu.h"
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#include "xtensa_interrupts.h"
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typedef enum {
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GPIO_INPUT,
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GPIO_OUTPUT, /* "Standard" push-pull output */
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GPIO_OUT_OPEN_DRAIN, /* Open drain output */
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GPIO_INPUT_PULLUP,
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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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uint32_t iomux_flags;
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uint32_t ctrl_val;
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switch(direction) {
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case GPIO_INPUT:
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iomux_flags = 0;
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ctrl_val = 0;
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break;
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case GPIO_OUTPUT:
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iomux_flags = IOMUX_PIN_OUTPUT_ENABLE;
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ctrl_val = GPIO_CONF_DRIVER_ENABLE;
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break;
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case GPIO_OUT_OPEN_DRAIN:
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iomux_flags = IOMUX_PIN_OUTPUT_ENABLE;
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ctrl_val = 0;
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break;
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case GPIO_INPUT_PULLUP:
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iomux_flags = IOMUX_PIN_PULLUP;
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ctrl_val = 0;
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break;
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}
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iomux_set_gpio_function(gpio_num, iomux_flags);
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GPIO.CONF[gpio_num] = (GPIO.CONF[gpio_num] & FIELD_MASK(GPIO_CONF_INTTYPE)) | ctrl_val;
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if (iomux_flags & IOMUX_PIN_OUTPUT_ENABLE)
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GPIO.ENABLE_OUT_SET = BIT(gpio_num);
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else
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GPIO.ENABLE_OUT_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_PIN_OUTPUT_ENABLE 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.ENABLE_OUT_CLEAR = BIT(gpio_num);
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*gpio_iomux_reg(gpio_num) &= ~IOMUX_PIN_OUTPUT_ENABLE;
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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 bool 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 & 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 & BIT(gpio_num);
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}
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extern void gpio_interrupt_handler(void);
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/* Set the interrupt type for a given pin
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*
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* If int_type is not GPIO_INTTYPE_NONE, the gpio_interrupt_handler will be attached and unmasked.
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*/
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INLINED void gpio_set_interrupt(const uint8_t gpio_num, const gpio_inttype_t int_type)
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{
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GPIO.CONF[gpio_num] = SET_FIELD(GPIO.CONF[gpio_num], GPIO_CONF_INTTYPE, int_type);
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if(int_type != GPIO_INTTYPE_NONE) {
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_xt_isr_attach(INUM_GPIO, gpio_interrupt_handler);
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_xt_isr_unmask(1<<INUM_GPIO);
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}
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}
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/* Return the interrupt type set for a pin */
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INLINED gpio_inttype_t gpio_get_interrupt(const uint8_t gpio_num)
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{
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return FIELD2VAL(GPIO_CONF_INTTYPE, GPIO.CONF[gpio_num]);
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}
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#endif
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