arduino-esp32/cores/esp32/esp32-hal-gpio.c

227 lines
5.9 KiB
C

// 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"
#define ETS_GPIO_INUM 4
const uint8_t esp32_gpioToFn[40] = {
0x44,//0
0x88,//1
0x40,//2
0x84,//3
0x48,//4
0x6c,//5
0x60,//6
0x64,//7
0x68,//8
0x54,//9
0x58,//10
0x5c,//11
0x34,//12
0x38,//13
0x30,//14
0x3c,//15
0x4c,//16
0x50,//17
0x70,//18
0x74,//19
0x78,//20
0x7c,//21
0x80,//22
0x8c,//23
0xFF,//N/A
0x24,//25
0x28,//26
0x2c,//27
0xFF,//N/A
0xFF,//N/A
0xFF,//N/A
0xFF,//N/A
0x1c,//32
0x20,//33
0x14,//34
0x18,//35
0x04,//36
0x08,//37
0x0c,//38
0x10 //39
};
typedef void (*voidFuncPtr)(void);
static voidFuncPtr __pinInterruptHandlers[GPIO_PIN_COUNT] = {0,};
extern void IRAM_ATTR __pinMode(uint8_t pin, uint8_t mode)
{
uint32_t pinFunction = 0, pinControl = 0;
if(pin > 39 || esp32_gpioToFn[pin] == 0xFF) {
return;
}
if(mode & INPUT) {
if(pin < 32) {
GPIO.enable_w1tc = ((uint32_t)1 << pin);
} else {
GPIO.enable1_w1tc.val = ((uint32_t)1 << (pin - 32));
}
if(mode & PULLUP) {
pinFunction |= FUN_PU;
} else if(mode & PULLDOWN) {
pinFunction |= FUN_PD;
}
} else if(mode & OUTPUT) {
if(pin < 32) {
GPIO.enable_w1ts = ((uint32_t)1 << pin);
} else {
GPIO.enable1_w1ts.val = ((uint32_t)1 << (pin - 32));
}
}
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);
}
if(mode & OPEN_DRAIN) {
pinControl = (1 << GPIO_PIN0_PAD_DRIVER_S);
}
ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioToFn[pin]) = pinFunction;
GPIO.pin[pin].val = pinControl;
}
extern void IRAM_ATTR __digitalWrite(uint8_t pin, uint8_t val)
{
if(pin > 39) {
return;
}
if(val) {
if(pin < 32) {
GPIO.out_w1ts = ((uint32_t)1 << pin);
} else {
GPIO.out1_w1ts.val = ((uint32_t)1 << (pin - 32));
}
} else {
if(pin < 32) {
GPIO.out_w1tc = ((uint32_t)1 << pin);
} else {
GPIO.out1_w1tc.val = ((uint32_t)1 << (pin - 32));
}
}
}
extern int IRAM_ATTR __digitalRead(uint8_t pin)
{
if(pin > 39) {
return 0;
}
if(pin < 32) {
return (GPIO.in >> pin) & 0x1;
} else {
return (GPIO.in1.val >> (pin - 32)) & 0x1;
}
}
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;
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);
}
extern void __detachInterrupt(uint8_t pin)
{
__pinInterruptHandlers[pin] = NULL;
ESP_INTR_DISABLE(ETS_GPIO_INUM);
GPIO.pin[pin].int_ena = 0;
GPIO.pin[pin].int_type = 0;
ESP_INTR_ENABLE(ETS_GPIO_INUM);
}
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")));