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core_esp8266_wiring_digital.c
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/*
digital.c - wiring digital implementation for esp8266
Copyright (c) 2015 Hristo Gochkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define ARDUINO_MAIN
#include "wiring_private.h"
#include "pins_arduino.h"
#include "c_types.h"
#include "eagle_soc.h"
#include "ets_sys.h"
#include "core_esp8266_waveform.h"
uint8_t esp8266_gpioToFn[16] = {0x34, 0x18, 0x38, 0x14, 0x3C, 0x40, 0x1C, 0x20, 0x24, 0x28, 0x2C, 0x30, 0x04, 0x08, 0x0C, 0x10};
extern void __pinMode(uint8_t pin, uint8_t mode) {
if(pin < 16){
if(mode == SPECIAL){
GPC(pin) = (GPC(pin) & (0xF << GPCI)); //SOURCE(GPIO) | DRIVER(NORMAL) | INT_TYPE(UNCHANGED) | WAKEUP_ENABLE(DISABLED)
GPEC = (1 << pin); //Disable
GPF(pin) = GPFFS(GPFFS_BUS(pin));//Set mode to BUS (RX0, TX0, TX1, SPI, HSPI or CLK depending in the pin)
if(pin == 3) GPF(pin) |= (1 << GPFPU);//enable pullup on RX
} else if(mode & FUNCTION_0){
GPC(pin) = (GPC(pin) & (0xF << GPCI)); //SOURCE(GPIO) | DRIVER(NORMAL) | INT_TYPE(UNCHANGED) | WAKEUP_ENABLE(DISABLED)
GPEC = (1 << pin); //Disable
GPF(pin) = GPFFS((mode >> 4) & 0x07);
if(pin == 13 && mode == FUNCTION_4) GPF(pin) |= (1 << GPFPU);//enable pullup on RX
} else if(mode == OUTPUT || mode == OUTPUT_OPEN_DRAIN){
GPF(pin) = GPFFS(GPFFS_GPIO(pin));//Set mode to GPIO
GPC(pin) = (GPC(pin) & (0xF << GPCI)); //SOURCE(GPIO) | DRIVER(NORMAL) | INT_TYPE(UNCHANGED) | WAKEUP_ENABLE(DISABLED)
if(mode == OUTPUT_OPEN_DRAIN) GPC(pin) |= (1 << GPCD);
GPES = (1 << pin); //Enable
} else if(mode == INPUT || mode == INPUT_PULLUP){
GPF(pin) = GPFFS(GPFFS_GPIO(pin));//Set mode to GPIO
GPEC = (1 << pin); //Disable
GPC(pin) = (GPC(pin) & (0xF << GPCI)) | (1 << GPCD); //SOURCE(GPIO) | DRIVER(OPEN_DRAIN) | INT_TYPE(UNCHANGED) | WAKEUP_ENABLE(DISABLED)
if(mode == INPUT_PULLUP) {
GPF(pin) |= (1 << GPFPU); // Enable Pullup
}
} else if(mode == WAKEUP_PULLUP || mode == WAKEUP_PULLDOWN){
GPF(pin) = GPFFS(GPFFS_GPIO(pin));//Set mode to GPIO
GPEC = (1 << pin); //Disable
if(mode == WAKEUP_PULLUP) {
GPF(pin) |= (1 << GPFPU); // Enable Pullup
GPC(pin) = (1 << GPCD) | (4 << GPCI) | (1 << GPCWE); //SOURCE(GPIO) | DRIVER(OPEN_DRAIN) | INT_TYPE(LOW) | WAKEUP_ENABLE(ENABLED)
} else {
GPF(pin) |= (1 << GPFPD); // Enable Pulldown
GPC(pin) = (1 << GPCD) | (5 << GPCI) | (1 << GPCWE); //SOURCE(GPIO) | DRIVER(OPEN_DRAIN) | INT_TYPE(HIGH) | WAKEUP_ENABLE(ENABLED)
}
}
} else if(pin == 16){
GPF16 = GP16FFS(GPFFS_GPIO(pin));//Set mode to GPIO
GPC16 = 0;
if(mode == INPUT || mode == INPUT_PULLDOWN_16){
if(mode == INPUT_PULLDOWN_16){
GPF16 |= (1 << GP16FPD);//Enable Pulldown
}
GP16E &= ~1;
} else if(mode == OUTPUT){
GP16E |= 1;
}
}
}
extern void ICACHE_RAM_ATTR __digitalWrite(uint8_t pin, uint8_t val) {
stopWaveform(pin);
if(pin < 16){
if(val) GPOS = (1 << pin);
else GPOC = (1 << pin);
} else if(pin == 16){
if(val) GP16O |= 1;
else GP16O &= ~1;
}
}
extern int ICACHE_RAM_ATTR __digitalRead(uint8_t pin) {
if(pin < 16){
return GPIP(pin);
} else if(pin == 16){
return GP16I & 0x01;
}
return 0;
}
/*
GPIO INTERRUPTS
*/
typedef void (*voidFuncPtr)(void);
typedef void (*voidFuncPtrArg)(void*);
typedef struct {
uint8_t mode;
void (*fn)(void);
void * arg;
} interrupt_handler_t;
//duplicate from functionalInterrupt.h keep in sync
typedef struct InterruptInfo {
uint8_t pin;
uint8_t value;
uint32_t micro;
} InterruptInfo;
typedef struct {
InterruptInfo* interruptInfo;
void* functionInfo;
} ArgStructure;
static interrupt_handler_t interrupt_handlers[16];
static uint32_t interrupt_reg = 0;
void ICACHE_RAM_ATTR interrupt_handler(void *arg) {
(void) arg;
uint32_t status = GPIE;
GPIEC = status;//clear them interrupts
uint32_t levels = GPI;
if(status == 0 || interrupt_reg == 0) return;
ETS_GPIO_INTR_DISABLE();
int i = 0;
uint32_t changedbits = status & interrupt_reg;
while(changedbits){
while(!(changedbits & (1 << i))) i++;
changedbits &= ~(1 << i);
interrupt_handler_t *handler = &interrupt_handlers[i];
if (handler->fn &&
(handler->mode == CHANGE ||
(handler->mode & 1) == !!(levels & (1 << i)))) {
// to make ISR compatible to Arduino AVR model where interrupts are disabled
// we disable them before we call the client ISR
uint32_t savedPS = xt_rsil(15); // stop other interrupts
ArgStructure* localArg = (ArgStructure*)handler->arg;
if (localArg && localArg->interruptInfo)
{
localArg->interruptInfo->pin = i;
localArg->interruptInfo->value = __digitalRead(i);
localArg->interruptInfo->micro = micros();
}
if (handler->arg)
{
((voidFuncPtrArg)handler->fn)(handler->arg);
}
else
{
handler->fn();
}
xt_wsr_ps(savedPS);
}
}
ETS_GPIO_INTR_ENABLE();
}
extern void cleanupFunctional(void* arg);
extern void ICACHE_RAM_ATTR __attachInterruptArg(uint8_t pin, voidFuncPtr userFunc, void *arg, int mode) {
if(pin < 16) {
ETS_GPIO_INTR_DISABLE();
interrupt_handler_t *handler = &interrupt_handlers[pin];
handler->mode = mode;
handler->fn = userFunc;
if (handler->arg) // Clean when new attach without detach
{
cleanupFunctional(handler->arg);
}
handler->arg = arg;
interrupt_reg |= (1 << pin);
GPC(pin) &= ~(0xF << GPCI);//INT mode disabled
GPIEC = (1 << pin); //Clear Interrupt for this pin
GPC(pin) |= ((mode & 0xF) << GPCI);//INT mode "mode"
ETS_GPIO_INTR_ATTACH(interrupt_handler, &interrupt_reg);
ETS_GPIO_INTR_ENABLE();
}
}
extern void ICACHE_RAM_ATTR __attachInterrupt(uint8_t pin, voidFuncPtr userFunc, int mode )
{
__attachInterruptArg (pin, userFunc, 0, mode);
}
extern void ICACHE_RAM_ATTR __detachInterrupt(uint8_t pin) {
if(pin < 16) {
ETS_GPIO_INTR_DISABLE();
GPC(pin) &= ~(0xF << GPCI);//INT mode disabled
GPIEC = (1 << pin); //Clear Interrupt for this pin
interrupt_reg &= ~(1 << pin);
interrupt_handler_t *handler = &interrupt_handlers[pin];
handler->mode = 0;
handler->fn = 0;
if (handler->arg)
{
cleanupFunctional(handler->arg);
}
handler->arg = 0;
if (interrupt_reg)
ETS_GPIO_INTR_ENABLE();
}
}
void initPins() {
//Disable UART interrupts
system_set_os_print(0);
U0IE = 0;
U1IE = 0;
for (int i = 0; i <= 5; ++i) {
pinMode(i, INPUT);
}
// pins 6-11 are used for the SPI flash interface
for (int i = 12; i <= 16; ++i) {
pinMode(i, INPUT);
}
}
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")));