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Brief PWM start
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@ -1,5 +1,5 @@
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/*
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* © 2021, Peter Cole. All rights reserved.
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* © 2022, Peter Cole. All rights reserved.
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*
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* This file is part of EX-CommandStation
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*
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@ -26,19 +26,14 @@
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* (Note the device driver is included by default)
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*
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* void halSetup() {
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* // EXIOExpander::create(vpin, num_vpins, i2c_address, digitalPinCount, analoguePinCount);
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* EXIOExpander::create(800, 18, 0x65, 12, 8);
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* // EXIOExpander::create(vpin, num_vpins, i2c_address);
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* EXIOExpander::create(800, 18, 0x65);
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* }
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*
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* Note when defining the number of digital and analogue pins, there is no way to sanity check
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* this from the device driver, and it is up to the user to define the correct values here.
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*
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* All pins available on the EX-IOExpander device must be accounted for.
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*
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* Vpins are allocated to digital pins first, and then analogue pins, so digital pins will
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* populate the first part of the specified vpin range, with the analogue pins populating the
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* last part of the vpin range.
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* Eg. for a default Nano, 800 - 811 are digital (D2 - D13), 812 to 817 are analogue (A0 - A3, A6/A7).
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* All pins on an EX-IOExpander device are allocated according to the pin map for the specific
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* device in use. There is no way for the device driver to sanity check pins are used for the
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* correct purpose, however the EX-IOExpander device's pin map will prevent pins being used
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* incorrectly (eg. A6/7 on Nano cannot be used for digital input/output).
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*/
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#ifndef IO_EX_IOEXPANDER_H
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@ -76,12 +71,15 @@ private:
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_command2Buffer[0] = EXIOINIT;
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_command2Buffer[1] = _nPins;
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// Send config, if EXIOINITA returned, we're good, setup analogue input buffer, otherwise go offline
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I2CManager.read(_i2cAddress, _receive2Buffer, 2, _command2Buffer, 2);
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if (_receive2Buffer[0] == EXIOINITA) {
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_numAnaloguePins = _receive2Buffer[1];
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I2CManager.read(_i2cAddress, _receive3Buffer, 3, _command2Buffer, 2);
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if (_receive3Buffer[0] == EXIOINITA) {
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_numAnaloguePins = _receive3Buffer[1];
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_numPWMPins = _receive3Buffer[2];
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_analoguePinBytes = _numAnaloguePins * 2;
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_analogueInputStates = (byte*) calloc(_analoguePinBytes, 1);
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_analoguePinMap = (uint8_t*) calloc(_numAnaloguePins, 1);
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_servoData = (struct ServoData*) calloc(_numPWMPins, 14);
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} else {
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DIAG(F("ERROR configuring EX-IOExpander device, I2C:x%x"), _i2cAddress);
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_deviceState = DEVSTATE_FAILED;
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@ -109,15 +107,24 @@ private:
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// Digital input pin configuration, used to enable on EX-IOExpander device and set pullups if in use
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bool _configure(VPIN vpin, ConfigTypeEnum configType, int paramCount, int params[]) override {
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if (configType != CONFIGURE_INPUT) return false;
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if (paramCount != 1) return false;
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bool pullup = params[0];
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int pin = vpin - _firstVpin;
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if (configType == CONFIGURE_INPUT) {
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bool pullup = params[0];
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_digitalOutBuffer[0] = EXIODPUP;
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_digitalOutBuffer[1] = pin;
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_digitalOutBuffer[2] = pullup;
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I2CManager.write(_i2cAddress, _digitalOutBuffer, 3);
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return true;
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} else if (configType == CONFIGURE_SERVO) {
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DIAG(F("Configure servo at pin %d"), (int)pin);
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for (int i = 0; i < paramCount; i++) {
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DIAG(F("Param %d is %x"), (int)i, params[i]);
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}
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return true;
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} else {
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return false;
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}
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}
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// Analogue input pin configuration, used to enable on EX-IOExpander device
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@ -175,7 +182,7 @@ private:
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}
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uint8_t _i2cAddress;
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uint8_t _numAnaloguePins;
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uint8_t _numAnaloguePins = 0;
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byte _digitalOutBuffer[3];
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uint8_t _versionBuffer[3];
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uint8_t _majorVer = 0;
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@ -187,8 +194,29 @@ private:
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uint8_t _analoguePinBytes = 0;
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byte _command1Buffer[1];
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byte _command2Buffer[2];
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byte _receive2Buffer[2];
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byte _receive3Buffer[3];
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uint8_t* _analoguePinMap;
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uint8_t _numPWMPins = 0;
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struct ServoData {
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uint16_t activePosition : 12; // Config parameter
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uint16_t inactivePosition : 12; // Config parameter
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uint16_t currentPosition : 12;
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uint16_t fromPosition : 12;
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uint16_t toPosition : 12;
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uint8_t profile; // Config parameter
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uint16_t stepNumber; // Index of current step (starting from 0)
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uint16_t numSteps; // Number of steps in animation, or 0 if none in progress.
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uint8_t currentProfile; // profile being used for current animation.
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uint16_t duration; // time (tenths of a second) for animation to complete.
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} ServoData; // 14 bytes per element, i.e. per pin in use
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struct ServoData* _servoData;
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static const uint8_t _catchupSteps = 5; // number of steps to wait before switching servo off
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static const byte FLASH _bounceProfile[30];
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const unsigned int refreshInterval = 50; // refresh every 50ms
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enum {
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EXIOINIT = 0xE0, // Flag to initialise setup procedure
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