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esp32-hal-gpio.c
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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "esp32-hal-gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "rom/ets_sys.h"
#include "esp_attr.h"
#include "esp_intr.h"
#include "rom/gpio.h"
#include "soc/gpio_reg.h"
#include "soc/io_mux_reg.h"
#include "soc/gpio_struct.h"
#include "soc/rtc_io_reg.h"
#define ETS_GPIO_INUM 12
const int8_t esp32_adc2gpio[20] = {36, -1, -1, 39, 32, 33, 34, 35, -1, -1, 4, 0, 2, 15, 13, 12, 14, 27, 25, 26};
const DRAM_ATTR esp32_gpioMux_t esp32_gpioMux[GPIO_PIN_COUNT]={
{0x44, 11, 11, 1},
{0x88, -1, -1, -1},
{0x40, 12, 12, 2},
{0x84, -1, -1, -1},
{0x48, 10, 10, 0},
{0x6c, -1, -1, -1},
{0x60, -1, -1, -1},
{0x64, -1, -1, -1},
{0x68, -1, -1, -1},
{0x54, -1, -1, -1},
{0x58, -1, -1, -1},
{0x5c, -1, -1, -1},
{0x34, 15, 15, 5},
{0x38, 14, 14, 4},
{0x30, 16, 16, 6},
{0x3c, 13, 13, 3},
{0x4c, -1, -1, -1},
{0x50, -1, -1, -1},
{0x70, -1, -1, -1},
{0x74, -1, -1, -1},
{0x78, -1, -1, -1},
{0x7c, -1, -1, -1},
{0x80, -1, -1, -1},
{0x8c, -1, -1, -1},
{0, -1, -1, -1},
{0x24, 6, 18, -1}, //DAC1
{0x28, 7, 19, -1}, //DAC2
{0x2c, 17, 17, 7},
{0, -1, -1, -1},
{0, -1, -1, -1},
{0, -1, -1, -1},
{0, -1, -1, -1},
{0x1c, 9, 4, 9},
{0x20, 8, 5, 8},
{0x14, 4, 6, -1},
{0x18, 5, 7, -1},
{0x04, 0, 0, -1},
{0x08, 1, -1, -1},
{0x0c, 2, -1, -1},
{0x10, 3, 3, -1}
};
typedef void (*voidFuncPtr)(void);
static voidFuncPtr __pinInterruptHandlers[GPIO_PIN_COUNT] = {0,};
#include "driver/rtc_io.h"
extern void IRAM_ATTR __pinMode(uint8_t pin, uint8_t mode)
{
if(!digitalPinIsValid(pin)) {
return;
}
uint32_t rtc_reg = rtc_gpio_desc[pin].reg;
if(mode == ANALOG) {
if(!rtc_reg) {
return;//not rtc pin
}
//lock rtc
uint32_t reg_val = ESP_REG(rtc_reg);
if(reg_val & rtc_gpio_desc[pin].mux){
return;//already in adc mode
}
reg_val &= ~(
(RTC_IO_TOUCH_PAD1_FUN_SEL_V << rtc_gpio_desc[pin].func)
|rtc_gpio_desc[pin].ie
|rtc_gpio_desc[pin].pullup
|rtc_gpio_desc[pin].pulldown);
ESP_REG(RTC_GPIO_ENABLE_W1TC_REG) = (1 << (rtc_gpio_desc[pin].rtc_num + RTC_GPIO_ENABLE_W1TC_S));
ESP_REG(rtc_reg) = reg_val | rtc_gpio_desc[pin].mux;
//unlock rtc
ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = ((uint32_t)2 << MCU_SEL_S) | ((uint32_t)2 << FUN_DRV_S) | FUN_IE;
return;
}
//RTC pins PULL settings
if(rtc_reg) {
//lock rtc
ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].mux);
if(mode & PULLUP) {
ESP_REG(rtc_reg) = (ESP_REG(rtc_reg) | rtc_gpio_desc[pin].pullup) & ~(rtc_gpio_desc[pin].pulldown);
} else if(mode & PULLDOWN) {
ESP_REG(rtc_reg) = (ESP_REG(rtc_reg) | rtc_gpio_desc[pin].pulldown) & ~(rtc_gpio_desc[pin].pullup);
} else {
ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].pullup | rtc_gpio_desc[pin].pulldown);
}
//unlock rtc
}
uint32_t pinFunction = 0, pinControl = 0;
//lock gpio
if(mode & INPUT) {
if(pin < 32) {
GPIO.enable_w1tc = ((uint32_t)1 << pin);
} else {
GPIO.enable1_w1tc.val = ((uint32_t)1 << (pin - 32));
}
} else if(mode & OUTPUT) {
if(pin > 33){
//unlock gpio
return;//pins above 33 can be only inputs
} else if(pin < 32) {
GPIO.enable_w1ts = ((uint32_t)1 << pin);
} else {
GPIO.enable1_w1ts.val = ((uint32_t)1 << (pin - 32));
}
}
if(mode & PULLUP) {
pinFunction |= FUN_PU;
} else if(mode & PULLDOWN) {
pinFunction |= FUN_PD;
}
pinFunction |= ((uint32_t)2 << FUN_DRV_S);//what are the drivers?
pinFunction |= FUN_IE;//input enable but required for output as well?
if(mode & (INPUT | OUTPUT)) {
pinFunction |= ((uint32_t)2 << MCU_SEL_S);
} else if(mode == SPECIAL) {
pinFunction |= ((uint32_t)(((pin)==1||(pin)==3)?0:1) << MCU_SEL_S);
} else {
pinFunction |= ((uint32_t)(mode >> 5) << MCU_SEL_S);
}
ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;
if(mode & OPEN_DRAIN) {
pinControl = (1 << GPIO_PIN0_PAD_DRIVER_S);
}
GPIO.pin[pin].val = pinControl;
//unlock gpio
}
extern void IRAM_ATTR __digitalWrite(uint8_t pin, uint8_t val)
{
if(val) {
if(pin < 32) {
GPIO.out_w1ts = ((uint32_t)1 << pin);
} else if(pin < 34) {
GPIO.out1_w1ts.val = ((uint32_t)1 << (pin - 32));
}
} else {
if(pin < 32) {
GPIO.out_w1tc = ((uint32_t)1 << pin);
} else if(pin < 34) {
GPIO.out1_w1tc.val = ((uint32_t)1 << (pin - 32));
}
}
}
extern int IRAM_ATTR __digitalRead(uint8_t pin)
{
if(pin < 32) {
return (GPIO.in >> pin) & 0x1;
} else if(pin < 40) {
return (GPIO.in1.val >> (pin - 32)) & 0x1;
}
return 0;
}
static void IRAM_ATTR __onPinInterrupt(void *arg)
{
uint32_t gpio_intr_status_l=0;
uint32_t gpio_intr_status_h=0;
gpio_intr_status_l = GPIO.status;
gpio_intr_status_h = GPIO.status1.val;
GPIO.status_w1tc = gpio_intr_status_l;//Clear intr for gpio0-gpio31
GPIO.status1_w1tc.val = gpio_intr_status_h;//Clear intr for gpio32-39
uint8_t pin=0;
if(gpio_intr_status_l) {
do {
if(gpio_intr_status_l & ((uint32_t)1 << pin)) {
if(__pinInterruptHandlers[pin]) {
__pinInterruptHandlers[pin]();
}
}
} while(++pin<32);
}
if(gpio_intr_status_h) {
pin=32;
do {
if(gpio_intr_status_h & ((uint32_t)1 << (pin - 32))) {
if(__pinInterruptHandlers[pin]) {
__pinInterruptHandlers[pin]();
}
}
} while(++pin<GPIO_PIN_COUNT);
}
}
extern void __attachInterrupt(uint8_t pin, voidFuncPtr userFunc, int intr_type)
{
static bool interrupt_initialized = false;
static int core_id = 0;
if(!interrupt_initialized) {
interrupt_initialized = true;
core_id = xPortGetCoreID();
ESP_INTR_DISABLE(ETS_GPIO_INUM);
intr_matrix_set(core_id, ETS_GPIO_INTR_SOURCE, ETS_GPIO_INUM);
xt_set_interrupt_handler(ETS_GPIO_INUM, &__onPinInterrupt, NULL);
ESP_INTR_ENABLE(ETS_GPIO_INUM);
}
__pinInterruptHandlers[pin] = userFunc;
//lock gpio
ESP_INTR_DISABLE(ETS_GPIO_INUM);
if(core_id) { //APP_CPU
GPIO.pin[pin].int_ena = 1;
} else { //PRO_CPU
GPIO.pin[pin].int_ena = 4;
}
GPIO.pin[pin].int_type = intr_type;
ESP_INTR_ENABLE(ETS_GPIO_INUM);
//unlock gpio
}
extern void __detachInterrupt(uint8_t pin)
{
//lock gpio
ESP_INTR_DISABLE(ETS_GPIO_INUM);
__pinInterruptHandlers[pin] = NULL;
GPIO.pin[pin].int_ena = 0;
GPIO.pin[pin].int_type = 0;
ESP_INTR_ENABLE(ETS_GPIO_INUM);
//unlock gpio
}
extern void pinMode(uint8_t pin, uint8_t mode) __attribute__ ((weak, alias("__pinMode")));
extern void digitalWrite(uint8_t pin, uint8_t val) __attribute__ ((weak, alias("__digitalWrite")));
extern int digitalRead(uint8_t pin) __attribute__ ((weak, alias("__digitalRead")));
extern void attachInterrupt(uint8_t pin, voidFuncPtr handler, int mode) __attribute__ ((weak, alias("__attachInterrupt")));
extern void detachInterrupt(uint8_t pin) __attribute__ ((weak, alias("__detachInterrupt")));