circuitpython/ports/esp8266/common-hal/microcontroller/Pin.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 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 "shared-bindings/microcontroller/__init__.h"
#include "common-hal/microcontroller/__init__.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/Pin.h"
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#include "py/mphal.h"
#include "eagle_soc.h"
bool adc_in_use;
bool gpio16_in_use;
typedef struct {
void (*func)(void *);
void *data;
} pin_intr_handler_t;
static pin_intr_handler_t _pin_intr_handlers[GPIO_PIN_COUNT];
void microcontroller_pin_call_intr_handlers(uint32_t status) {
status &= (1 << GPIO_PIN_COUNT) - 1;
for (int p = 0; status; ++p, status >>= 1) {
if ((status & 1) && _pin_intr_handlers[p].func) {
_pin_intr_handlers[p].func(_pin_intr_handlers[p].data);
}
}
}
void microcontroller_pin_register_intr_handler(uint8_t gpio_number, void (*func)(void *), void *data) {
common_hal_mcu_disable_interrupts();
_pin_intr_handlers[gpio_number] = (pin_intr_handler_t){ func, data };
common_hal_mcu_enable_interrupts();
}
bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t* pin) {
if (pin == &pin_TOUT) {
return !adc_in_use;
}
if (pin == &pin_XPD_DCDC) {
return !gpio16_in_use;
}
if (pin->gpio_number == NO_GPIO) {
return false;
}
return (READ_PERI_REG(pin->peripheral) &
(PERIPHS_IO_MUX_FUNC<<PERIPHS_IO_MUX_FUNC_S)) == 0 &&
(GPIO_REG_READ(GPIO_ENABLE_ADDRESS) & (1 << pin->gpio_number)) == 0 &&
(READ_PERI_REG(pin->peripheral) & PERIPHS_IO_MUX_PULLUP) == 0;
}
void claim_pin(const mcu_pin_obj_t* pin) {
if (pin == &pin_XPD_DCDC) {
gpio16_in_use = true;
}
if (pin == &pin_TOUT) {
adc_in_use = true;
}
}
void reset_pin(const mcu_pin_obj_t* pin) {
if (pin == &pin_XPD_DCDC) {
// Set GPIO16 as input
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1); // mux configuration for XPD_DCDC and rtc_gpio0 connection
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1); //mux configuration for out enable
WRITE_PERI_REG(RTC_GPIO_ENABLE, READ_PERI_REG(RTC_GPIO_ENABLE) & ~1); //out disable
gpio16_in_use = false;
}
if (pin == &pin_TOUT) {
adc_in_use = false;
}
}
void reset_pins(void) {
for (int i = 0; i < 16; i++) {
// 5 is RXD, 6 is TXD
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if ((i > 4 && i < 13) || i == 12) {
continue;
}
uint32_t peripheral = PERIPHS_IO_MUX + i * 4;
PIN_FUNC_SELECT(peripheral, 0);
PIN_PULLUP_DIS(peripheral);
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// Disable the pin.
gpio_output_set(0x0, 0x0, 0x0, 1 << i);
}
// Set GPIO16 as input
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1); // mux configuration for XPD_DCDC and rtc_gpio0 connection
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1); //mux configuration for out enable
WRITE_PERI_REG(RTC_GPIO_ENABLE, READ_PERI_REG(RTC_GPIO_ENABLE) & ~1); //out disable
adc_in_use = false;
gpio16_in_use = false;
}