configs/components/ads131m08/ads131m08.cpp

#include "ads131m08.h"
/*
namespace esphome {
namespace ads131m08 {

static const char *const TAG = "ads131m08";

ADS131M08::ADS131M08(esphome::gpio::GPIOPin *pin) 
: drdy_pin_(pin)
{
}

void ADS131M08::set_drdy_pin(InternalGPIOPin *pin)
{ 
  drdy_pin_ = pin; 
}

void ADS131M08::set_sensor(int channel, sensor::Sensor *s) 
{ 
  channels_[channel] = s; 
}

void ADS131M08::set_reference_voltage(float reference_voltage) 
{ 
  this->reference_voltage_ = reference_voltage; 
}
  
float ADS131M08::get_setup_priority() const 
{ 
  return setup_priority::HARDWARE; 
}

void ADS131M08::setup() 
{
  // Initialize SPI with correct settings for ADS131M08
  // SPI mode 1: CPOL=0, CPHA=1
  //this->spi_setup(); 
  SPI.begin();
  SPI.setDataMode(SPI_MODE1);
  SPI.setBitOrder(MSBFIRST);
  SPI.setClockDivider(SPI_CLOCK_DIV8);  // Adjust clock speed as needed

  // Configure DRDY pin
  drdy_pin_->setup();
  drdy_pin_->pin_mode(esphome::gpio::FLAG_INPUT | esphome::gpio::FLAG_PULLUP);

  // Attach interrupt on falling edge of DRDY
//  esphome::gpio::attach_interrupt(drdy_pin_, esphome::gpio::INTERRUPT_FALLING_EDGE, [this]() {
//    this->data_ready_ = true;
//  });
  this->drdy_pin_->attach_interrupt(&ADS131M08Component::handle_drdy, this, gpio::INTERRUPT_FALLING_EDGE);

  // Initialize ADS131M08
  initialize_ads131m08();
}

// interrupt handler
void ADS131M08::handle_drdy(ADS131M08Component *arg)
{
  arg->data_ready_ = true; 
}

void ADS131M08::loop() 
{
  if (data_ready_) {
    data_ready_ = false;
    read_all_channels();
  }
}

void ADS131M08::initialize_ads131m08() 
{
  // Send RESET command
  SPI.transfer(0x06);
  delay(1);

  // Send UNLOCK command
  SPI.transfer(0x55);
  SPI.transfer(0x55);

  // Configure registers as needed (example: set gain, etc.)
  // Write to MODE register for continuous conversion, disable internal reference (use external MAX6070AAUT12+T at 1.25V)
  write_register(0x02, 0x0000);  // MODE register, continuous mode, INTREF_EN = 0

  // Wait for external reference to settle
  delay(100);

  // Start conversions
  SPI.transfer(0x08);  // START command
}

void ADS131M08::write_register(uint8_t reg, uint16_t value) 
{
  SPI.transfer(0x40 | reg);  // WREG command
  SPI.transfer(0x00);        // Number of registers - 1 (0 for one register)
  SPI.transfer((value >> 8) & 0xFF);
  SPI.transfer(value & 0xFF);
}

void ADS131M08::read_all_channels() 
{
  // Send RDATA command or read data directly
  SPI.transfer(0x12);  // RDATA command

  // Read 24 bytes (3 bytes per channel for 8 channels)
  for (int i = 0; i < 24; i++) {
    data_buffer_[i] = SPI.transfer(0x00);
  }

  // Convert to voltages for all channels
  //Sensor *channels[8] = {channel1, channel2, channel3, channel4, channel5, channel6, channel7, channel8};
  for (int ch = 0; ch < 8; ch++) {
    if (this->sensors_[ch] != nullptr) {
      int offset = ch * 3;
      int32_t raw = (data_buffer_[offset] << 16) | (data_buffer_[offset + 1] << 8) | data_buffer_[offset + 2];
      if (raw & 0x800000) 
        raw |= 0xFF000000;  // Sign extend
      float v = (raw / 8388608.0) * this->reference_voltage_;  // 2^23 = 8388608, Vref = 1.25V (MAX6070AAUT12+T)
      this->sensors_[ch]->publish_state(v);
    }
  }
}

float ADS131M08::read_data(uint8_t channel) 
{
  // This function assumes read_all_channels() has been called and data is in data_buffer_
  int offset = channel * 3;
  int32_t raw = (data_buffer_[offset] << 16) | (data_buffer_[offset + 1] << 8) | data_buffer_[offset + 2];
  if (raw & 0x800000) 
    raw |= 0xFF000000;  // Sign extend
  float v = (raw / 8388608.0) * this->reference_voltage_;  // 2^23 = 8388608, Vref = 1.25V (MAX6070AAUT12+T)
  return v;
}

void ADS131M08::dump_config() {
  ESP_LOGCONFIG(TAG, "ADS131M08:");
  LOG_PIN("  CS Pin:", this->cs_);
  ESP_LOGCONFIG(TAG, "  Reference Voltage: %.2fV", this->reference_voltage_);
}

} // namespace ads131m08
} // namespace esphome
 */
namespace esphome {
namespace ads131m08 {

static const char *const TAG = "ads131m08";

void ADS131M08Hub::setup() 
{
  this->spi_setup();
  this->drdy_pin_->setup();
  this->drdy_pin_->attach_interrupt(&ADS131M08Hub::isr, this, gpio::INTERRUPT_FALLING_EDGE);
}

void IRAM_ATTR ADS131M08Hub::isr(ADS131M08Hub *arg) 
{
  arg->data_ready_ = true; 
}

void ADS131M08Hub::loop() 
{
  if (this->data_ready_) {
    this->data_ready_ = false;
    this->read_data_();
  }
}

void ADS131M08Hub::read_data_() 
{
  this->enable();
  // ADS131M08 Frame: 1 Status Word + 8 Channel Words + 1 CRC Word (24-bit words)
  uint8_t frame[30]; // 10 words * 3 bytes
  this->read_array(frame, 30);
  this->disable();

  for (int i = 0; i < 8; i++) {
    if (this->sensors_[i] != nullptr) {
      // Convert 24-bit two's complement to float (Simplified)
      int32_t raw = (frame[3+(i*3)] << 16) | (frame[4+(i*3)] << 8) | frame[5+(i*3)];
      if (raw & 0x800000) 
        raw |= 0xFF000000;  // Sign extend
      this->sensors_[i]->publish_state(raw * (this->reference_voltage_ / 8388608.0)); // 2^23 = 8388608, Vref = 1.25V ( for MAX6070AAUT12+T )
    }
  }
}

void ADS131M08Hub::dump_config() 
{
  ESP_LOGCONFIG(TAG, "ADS131M08:");
  LOG_PIN("  CS Pin:", this->cs_);
  LOG_PIN("  DRDY Pin:", this->drdy_pin_);
  ESP_LOGCONFIG(TAG, "  Reference Voltage: %.2fV", this->reference_voltage_);
}

} // namespace ads131m08
} // namespace esphome