gpio.cpp

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#ifdef USE_ESP8266
 
#include "gpio.h"
#include "esphome/core/log.h"
 
namespace esphome::esp8266 {
 
static const char *const TAG = "esp8266";
 
static int flags_to_mode(gpio::Flags flags, uint8_t pin) {
  if (flags == gpio::FLAG_OUTPUT || flags == (gpio::FLAG_OUTPUT | gpio::FLAG_INPUT)) {
    return OUTPUT;
  }
  if (flags == gpio::FLAG_INPUT) {
    return INPUT;
  }
  if (flags == (gpio::FLAG_INPUT | gpio::FLAG_PULLUP)) {
    if (pin == 16) {
      // GPIO16 doesn't have a pullup, so pinMode would fail.
      // However, sometimes this method is called with pullup mode anyway
      // for example from dallas one_wire. For those cases convert this
      // to a INPUT mode.
      return INPUT;
    }
    return INPUT_PULLUP;
  }
  if (flags == (gpio::FLAG_INPUT | gpio::FLAG_PULLDOWN)) {
    return INPUT_PULLDOWN_16;
  }
  if (flags == (gpio::FLAG_OUTPUT | gpio::FLAG_OPEN_DRAIN)) {
    return OUTPUT_OPEN_DRAIN;
  }
  return INPUT;
}
 
struct ISRPinArg {
  uint8_t pin;
  bool inverted;
  volatile uint32_t *in_reg;
  volatile uint32_t *out_set_reg;
  volatile uint32_t *out_clr_reg;
  volatile uint32_t *mode_set_reg;
  volatile uint32_t *mode_clr_reg;
  volatile uint32_t *func_reg;
  volatile uint32_t *control_reg;
  uint32_t mask;
};
 
ISRInternalGPIOPin ESP8266GPIOPin::to_isr() const {
  auto *arg = new ISRPinArg{};  // NOLINT(cppcoreguidelines-owning-memory)
  arg->pin = this->pin_;
  arg->inverted = this->inverted_;
  if (this->pin_ < 16) {
    arg->in_reg = &GPI;
    arg->out_set_reg = &GPOS;
    arg->out_clr_reg = &GPOC;
    arg->mode_set_reg = &GPES;
    arg->mode_clr_reg = &GPEC;
    arg->func_reg = &GPF(this->pin_);
    arg->control_reg = &GPC(this->pin_);
    arg->mask = 1 << this->pin_;
  } else {
    arg->in_reg = &GP16I;
    arg->out_set_reg = &GP16O;
    arg->out_clr_reg = nullptr;
    arg->mode_set_reg = &GP16E;
    arg->mode_clr_reg = nullptr;
    arg->func_reg = &GPF16;
    arg->control_reg = nullptr;
    arg->mask = 1;
  }
  return ISRInternalGPIOPin((void *) arg);
}
 
void ESP8266GPIOPin::attach_interrupt(void (*func)(void *), void *arg, gpio::InterruptType type) const {
  uint8_t arduino_mode = 0;
  switch (type) {
    case gpio::INTERRUPT_RISING_EDGE:
      arduino_mode = inverted_ ? FALLING : RISING;
      break;
    case gpio::INTERRUPT_FALLING_EDGE:
      arduino_mode = inverted_ ? RISING : FALLING;
      break;
    case gpio::INTERRUPT_ANY_EDGE:
      arduino_mode = CHANGE;
      break;
    case gpio::INTERRUPT_LOW_LEVEL:
      arduino_mode = inverted_ ? ONHIGH : ONLOW;
      break;
    case gpio::INTERRUPT_HIGH_LEVEL:
      arduino_mode = inverted_ ? ONLOW : ONHIGH;
      break;
  }
 
  attachInterruptArg(pin_, func, arg, arduino_mode);
}
void ESP8266GPIOPin::pin_mode(gpio::Flags flags) {
  pinMode(pin_, flags_to_mode(flags, pin_));  // NOLINT
}
 
size_t ESP8266GPIOPin::dump_summary(char *buffer, size_t len) const {
  return snprintf(buffer, len, "GPIO%u", this->pin_);
}
 
bool ESP8266GPIOPin::digital_read() {
  return bool(digitalRead(pin_)) != inverted_;  // NOLINT
}
void ESP8266GPIOPin::digital_write(bool value) {
  digitalWrite(pin_, value != inverted_ ? 1 : 0);  // NOLINT
}
void ESP8266GPIOPin::detach_interrupt() const { detachInterrupt(pin_); }
 
}  // namespace esphome::esp8266
 
namespace esphome {
 
using esp8266::ISRPinArg;
 
bool IRAM_ATTR ISRInternalGPIOPin::digital_read() {
  auto *arg = reinterpret_cast<ISRPinArg *>(this->arg_);
  return bool(*arg->in_reg & arg->mask) != arg->inverted;
}
 
void IRAM_ATTR ISRInternalGPIOPin::digital_write(bool value) {
  auto *arg = reinterpret_cast<ISRPinArg *>(arg_);
  if (arg->pin < 16) {
    if (value != arg->inverted) {
      *arg->out_set_reg = arg->mask;
    } else {
      *arg->out_clr_reg = arg->mask;
    }
  } else {
    if (value != arg->inverted) {
      *arg->out_set_reg = *arg->out_set_reg | 1;
    } else {
      *arg->out_set_reg = *arg->out_set_reg & ~1;
    }
  }
}
 
void IRAM_ATTR ISRInternalGPIOPin::clear_interrupt() {
  auto *arg = reinterpret_cast<ISRPinArg *>(arg_);
  GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1UL << arg->pin);
}
 
void IRAM_ATTR ISRInternalGPIOPin::pin_mode(gpio::Flags flags) {
  auto *arg = reinterpret_cast<ISRPinArg *>(this->arg_);
  if (arg->pin < 16) {
    if (flags & gpio::FLAG_OUTPUT) {
      *arg->mode_set_reg = arg->mask;
      if (flags & gpio::FLAG_OPEN_DRAIN) {
        *arg->control_reg = *arg->control_reg | (1 << GPCD);
      } else {
        *arg->control_reg &= ~(1 << GPCD);
      }
    } else if (flags & gpio::FLAG_INPUT) {
      *arg->mode_clr_reg = arg->mask;
    }
    if (flags & gpio::FLAG_PULLUP) {
      *arg->func_reg = *arg->func_reg | (1 << GPFPU);
      *arg->control_reg = *arg->control_reg | (1 << GPCD);
    } else {
      *arg->func_reg = *arg->func_reg & ~(1 << GPFPU);
    }
  } else {
    if (flags & gpio::FLAG_OUTPUT) {
      *arg->mode_set_reg = *arg->mode_set_reg | 1;
    } else {
      *arg->mode_set_reg = *arg->mode_set_reg & ~1;
    }
    if (flags & gpio::FLAG_PULLDOWN) {
      *arg->func_reg = *arg->func_reg | (1 << GP16FPD);
    } else {
      *arg->func_reg = *arg->func_reg & ~(1 << GP16FPD);
    }
  }
}
 
}  // namespace esphome
 
#endif  // USE_ESP8266