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Merge pull request #577 from tyeth/add-NAU7802
Add NAU7802
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141
src/components/i2c/drivers/WipperSnapper_I2C_Driver_NAU7802.h
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| /*! | ||
| * @file WipperSnapper_I2C_Driver_NAU7802.h | ||
| * | ||
| * Device driver for the NAU7802 24bit ADC / load cell breakout | ||
| * | ||
| * Adafruit invests time and resources providing this open source code, | ||
| * please support Adafruit and open-source hardware by purchasing | ||
| * products from Adafruit! | ||
| * | ||
| * Copyright (c) Tyeth Gundry for Adafruit Industries 2024 | ||
| * | ||
| * MIT license, all text here must be included in any redistribution. | ||
| * | ||
| */ | ||
|
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| #ifndef WipperSnapper_I2C_Driver_NAU7802_H | ||
| #define WipperSnapper_I2C_Driver_NAU7802_H | ||
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| #include "WipperSnapper_I2C_Driver.h" | ||
| #include <Adafruit_NAU7802.h> | ||
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| #define NAU7802_TIMEOUT_MS 250 ///< Timeout waiting for data from NAU7802 | ||
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| /**************************************************************************/ | ||
| /*! | ||
| @brief Class that provides a driver interface for the NAU7802. | ||
| */ | ||
| /**************************************************************************/ | ||
| class WipperSnapper_I2C_Driver_NAU7802 : public WipperSnapper_I2C_Driver { | ||
| public: | ||
| /*******************************************************************************/ | ||
| /*! | ||
| @brief Constructor for an NAU7802. | ||
| @param i2c | ||
| The I2C interface. | ||
| @param sensorAddress | ||
| 7-bit device address. | ||
| */ | ||
| /*******************************************************************************/ | ||
| WipperSnapper_I2C_Driver_NAU7802(TwoWire *i2c, uint16_t sensorAddress) | ||
| : WipperSnapper_I2C_Driver(i2c, sensorAddress) { | ||
| _i2c = i2c; | ||
| _sensorAddress = sensorAddress; | ||
| _nau7802 = new Adafruit_NAU7802(); | ||
| } | ||
|
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| /*******************************************************************************/ | ||
| /*! | ||
| @brief Destructor for an NAU7802. | ||
| */ | ||
| /*******************************************************************************/ | ||
| ~WipperSnapper_I2C_Driver_NAU7802() { _nau7802 = nullptr; } | ||
|
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| /*******************************************************************************/ | ||
| /*! | ||
| @brief Initializes the NAU7802 sensor and begins I2C. | ||
| @returns True if initialized successfully, False otherwise. | ||
| */ | ||
| /*******************************************************************************/ | ||
| bool begin() { return _nau7802->begin(_i2c) && configure_nau7802(); } | ||
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| /*******************************************************************************/ | ||
| /*! | ||
| @brief Configures the NAU7802 sensor. | ||
| @returns True if configured successfully, False otherwise. | ||
| */ | ||
| /*******************************************************************************/ | ||
| bool configure_nau7802() { | ||
| if (!_nau7802->setLDO(NAU7802_3V0)) { | ||
| WS_DEBUG_PRINTLN("Failed to set LDO to 3V0"); | ||
| return false; | ||
| } | ||
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| if (!_nau7802->setGain(NAU7802_GAIN_128)) { | ||
| WS_DEBUG_PRINTLN("Failed to set gain to 128"); | ||
| return false; | ||
| } | ||
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| if (!_nau7802->setRate(NAU7802_RATE_10SPS) && | ||
| !_nau7802->setRate(NAU7802_RATE_10SPS)) { | ||
| WS_DEBUG_PRINTLN("Failed to set sample rate to 10SPS"); | ||
| return false; | ||
| } | ||
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| // Take 10 readings to flush out old readings (10 samples per second) | ||
| flushNAU7802(10); | ||
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| for (int retries = 0; retries < 3; retries++) { | ||
| if (_nau7802->calibrate(NAU7802_CALMOD_INTERNAL)) { | ||
| WS_DEBUG_PRINTLN("Calibrated internal offset"); | ||
| return true; | ||
| } | ||
| WS_DEBUG_PRINTLN("Failed to calibrate internal offset, retrying!"); | ||
| delay(1000); | ||
| } | ||
| WS_DEBUG_PRINTLN("ERROR: Failed to calibrate internal offset of NAU7802."); | ||
| return false; | ||
| } | ||
|
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| /*******************************************************************************/ | ||
| /*! | ||
| @brief Gets datapoints from sensor and discards (flushes old data). | ||
| @param count | ||
| Number of readings to discard. | ||
| */ | ||
| /*******************************************************************************/ | ||
| void flushNAU7802(uint8_t count) { | ||
| for (uint8_t skipCounter = 0; skipCounter < count; skipCounter++) { | ||
| while (!_nau7802->available()) | ||
| delay(1); | ||
| _nau7802->read(); | ||
| } | ||
| } | ||
|
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| /*******************************************************************************/ | ||
| /*! | ||
| @brief Gets the sensor's raw "force" value. | ||
| @param rawEvent | ||
| Pointer to an Adafruit_Sensor event. | ||
| @returns True if the reading was obtained successfully, False otherwise. | ||
| */ | ||
| /*******************************************************************************/ | ||
| bool getEventRaw(sensors_event_t *rawEvent) { | ||
| unsigned long start = millis(); | ||
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| // Wait for the sensor to be ready | ||
| while (!_nau7802->available()) { | ||
| if (millis() - start > NAU7802_TIMEOUT_MS) { | ||
| WS_DEBUG_PRINTLN("NAU7802 data not available"); | ||
| return false; | ||
| } | ||
| } | ||
| rawEvent->data[0] = (float)_nau7802->read(); | ||
| return true; | ||
| } | ||
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| protected: | ||
| Adafruit_NAU7802 *_nau7802 = nullptr; ///< NAU7802 object | ||
| }; | ||
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| #endif // WipperSnapper_I2C_Driver_NAU7802_H |