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王立帮
2024-07-20 22:09:06 +08:00
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arduino-cli/libraries/Adafruit_MPR121/Adafruit_MPR121.cpp Normal file
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/*!
* @file Adafruit_MPR121.cpp
*
* @mainpage Adafruit MPR121 arduino driver
*
* @section intro_sec Introduction
*
* This is a library for the MPR121 I2C 12-chan Capacitive Sensor
*
* Designed specifically to work with the MPR121 sensor from Adafruit
* ----> https://www.adafruit.com/products/1982
*
* These sensors use I2C to communicate, 2+ pins are required to
* interface
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit and open-source hardware by purchasing
* products from Adafruit!
*
* @section author Author
*
* Written by Limor Fried/Ladyada for Adafruit Industries.
*
* @section license License
*
* BSD license, all text here must be included in any redistribution.
*/
#include "Adafruit_MPR121.h"
// uncomment to use autoconfig !
//#define AUTOCONFIG // use autoconfig (Yes it works pretty well!)
/*!
* @brief Default constructor
*/
Adafruit_MPR121::Adafruit_MPR121() {}
/*!
* @brief Begin an MPR121 object on a given I2C bus. This function resets
* the device and writes the default settings.
* @param i2caddr
* the i2c address the device can be found on. Defaults to 0x5A.
* @param *theWire
* Wire object
* @param touchThreshold
* touch detection threshold value
* @param releaseThreshold
* release detection threshold value
* @returns true on success, false otherwise
*/
boolean Adafruit_MPR121::begin(uint8_t i2caddr, TwoWire *theWire,
uint8_t touchThreshold,
uint8_t releaseThreshold) {
_i2caddr = i2caddr;
_wire = theWire;
_wire->begin();
// soft reset
writeRegister(MPR121_SOFTRESET, 0x63);
delay(1);
for (uint8_t i = 0; i < 0x7F; i++) {
// Serial.print("$"); Serial.print(i, HEX);
// Serial.print(": 0x"); Serial.println(readRegister8(i));
}
writeRegister(MPR121_ECR, 0x0);
uint8_t c = readRegister8(MPR121_CONFIG2);
if (c != 0x24)
return false;
setThresholds(touchThreshold, releaseThreshold);
writeRegister(MPR121_MHDR, 0x01);
writeRegister(MPR121_NHDR, 0x01);
writeRegister(MPR121_NCLR, 0x0E);
writeRegister(MPR121_FDLR, 0x00);
writeRegister(MPR121_MHDF, 0x01);
writeRegister(MPR121_NHDF, 0x05);
writeRegister(MPR121_NCLF, 0x01);
writeRegister(MPR121_FDLF, 0x00);
writeRegister(MPR121_NHDT, 0x00);
writeRegister(MPR121_NCLT, 0x00);
writeRegister(MPR121_FDLT, 0x00);
writeRegister(MPR121_DEBOUNCE, 0);
writeRegister(MPR121_CONFIG1, 0x10); // default, 16uA charge current
writeRegister(MPR121_CONFIG2, 0x20); // 0.5uS encoding, 1ms period
#ifdef AUTOCONFIG
writeRegister(MPR121_AUTOCONFIG0, 0x0B);
// correct values for Vdd = 3.3V
writeRegister(MPR121_UPLIMIT, 200); // ((Vdd - 0.7)/Vdd) * 256
writeRegister(MPR121_TARGETLIMIT, 180); // UPLIMIT * 0.9
writeRegister(MPR121_LOWLIMIT, 130); // UPLIMIT * 0.65
#endif
// enable X electrodes and start MPR121
byte ECR_SETTING =
B10000000 + 12; // 5 bits for baseline tracking & proximity disabled + X
// amount of electrodes running (12)
writeRegister(MPR121_ECR, ECR_SETTING); // start with above ECR setting
return true;
}
/*!
* @brief DEPRECATED. Use Adafruit_MPR121::setThresholds(uint8_t touch,
* uint8_t release) instead.
* @param touch
* see Adafruit_MPR121::setThresholds(uint8_t touch, uint8_t
* *release)
* @param release
* see Adafruit_MPR121::setThresholds(uint8_t touch, *uint8_t
* release)
*/
void Adafruit_MPR121::setThreshholds(uint8_t touch, uint8_t release) {
setThresholds(touch, release);
}
/*!
* @brief Set the touch and release thresholds for all 13 channels on the
* device to the passed values. The threshold is defined as a
* deviation value from the baseline value, so it remains constant
* even baseline value changes. Typically the touch threshold is a little bigger
* than the release threshold to touch debounce and hysteresis. For typical
* touch application, the value can be in range 0x05~0x30 for example. The
* setting of the threshold is depended on the actual application. For the
* operation details and how to set the threshold refer to application note
* AN3892 and MPR121 design guidelines.
* @param touch
* the touch threshold value from 0 to 255.
* @param release
* the release threshold from 0 to 255.
*/
void Adafruit_MPR121::setThresholds(uint8_t touch, uint8_t release) {
// first stop sensor to make changes
writeRegister(MPR121_ECR, 0x00);
// set all thresholds (the same)
for (uint8_t i = 0; i < 12; i++) {
writeRegister(MPR121_TOUCHTH_0 + 2 * i, touch);
writeRegister(MPR121_RELEASETH_0 + 2 * i, release);
}
// turn the sensor on again
writeRegister(MPR121_ECR, 0x8F);
}
/*!
* @brief Read the filtered data from channel t. The ADC raw data outputs
* run through 3 levels of digital filtering to filter out the high
* frequency and low frequency noise encountered. For detailed information on
* this filtering see page 6 of the device datasheet.
* @param t
* the channel to read
* @returns the filtered reading as a 10 bit unsigned value
*/
uint16_t Adafruit_MPR121::filteredData(uint8_t t) {
if (t > 12)
return 0;
return readRegister16(MPR121_FILTDATA_0L + t * 2);
}
/*!
* @brief Read the baseline value for the channel. The 3rd level filtered
* result is internally 10bit but only high 8 bits are readable
* from registers 0x1E~0x2A as the baseline value output for each channel.
* @param t
* the channel to read.
* @returns the baseline data that was read
*/
uint16_t Adafruit_MPR121::baselineData(uint8_t t) {
if (t > 12)
return 0;
uint16_t bl = readRegister8(MPR121_BASELINE_0 + t);
return (bl << 2);
}
/**
* @brief Read the touch status of all 13 channels as bit values in a 12
* bit integer.
* @returns a 12 bit integer with each bit corresponding to the touch status
* of a sensor. For example, if bit 0 is set then channel 0 of the
* device is currently deemed to be touched.
*/
uint16_t Adafruit_MPR121::touched(void) {
uint16_t t = readRegister16(MPR121_TOUCHSTATUS_L);
return t & 0x0FFF;
}
/*!
* @brief Read the contents of an 8 bit device register.
* @param reg the register address to read from
* @returns the 8 bit value that was read.
*/
uint8_t Adafruit_MPR121::readRegister8(uint8_t reg) {
_wire->beginTransmission(_i2caddr);
_wire->write(reg);
_wire->endTransmission(false);
_wire->requestFrom(_i2caddr, 1);
if (_wire->available() < 1)
return 0;
return (_wire->read());
}
/*!
* @brief Read the contents of a 16 bit device register.
* @param reg the register address to read from
* @returns the 16 bit value that was read.
*/
uint16_t Adafruit_MPR121::readRegister16(uint8_t reg) {
_wire->beginTransmission(_i2caddr);
_wire->write(reg);
_wire->endTransmission(false);
_wire->requestFrom(_i2caddr, 2);
if (_wire->available() < 2)
return 0;
uint16_t v = _wire->read();
v |= ((uint16_t)_wire->read()) << 8;
return v;
}
/*!
@brief Writes 8-bits to the specified destination register
@param reg the register address to write to
@param value the value to write
*/
void Adafruit_MPR121::writeRegister(uint8_t reg, uint8_t value) {
// MPR121 must be put in Stop Mode to write to most registers
bool stop_required = true;
uint8_t ECR = readRegister8(
MPR121_ECR); // first get the current set value of the MPR121_ECR register
if (reg == MPR121_ECR || (0x73 <= reg && reg <= 0x7A)) {
stop_required = false;
}
if (stop_required) {
_wire->beginTransmission(_i2caddr);
_wire->write(MPR121_ECR);
_wire->write((byte)0x00); // clear this register to set stop modus
_wire->endTransmission();
}
_wire->beginTransmission(_i2caddr);
_wire->write((uint8_t)reg);
_wire->write((uint8_t)(value));
_wire->endTransmission();
if (stop_required) {
_wire->beginTransmission(_i2caddr);
_wire->write(MPR121_ECR);
_wire->write(ECR); // write back the previous set ECR settings
_wire->endTransmission();
}
}