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