mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-23 21:01:25 +01:00
d5a394d4e6
Update I2C addresses of HAL devices to type I2CAddress (to support extended address functions). Cast I2CAddress variables in DIAG calls to (int). Remove uses of max() function (not available on some platforms.
111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/*
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* © 2021, Neil McKechnie. All rights reserved.
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*
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* This file is part of DCC++EX API
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef io_mcp23017_h
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#define io_mcp23017_h
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#include "IO_GPIOBase.h"
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#include "FSH.h"
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/////////////////////////////////////////////////////////////////////////////////////////////////////
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/*
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* IODevice subclass for MCP23017 16-bit I/O expander.
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*/
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class MCP23017 : public GPIOBase<uint16_t> {
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public:
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static void create(VPIN vpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1) {
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if (checkNoOverlap(vpin, nPins, i2cAddress)) new MCP23017(vpin, nPins, i2cAddress, interruptPin);
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}
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private:
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// Constructor
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MCP23017(VPIN vpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1)
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: GPIOBase<uint16_t>((FSH *)F("MCP23017"), vpin, nPins, i2cAddress, interruptPin)
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{
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requestBlock.setRequestParams(_I2CAddress, inputBuffer, sizeof(inputBuffer),
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outputBuffer, sizeof(outputBuffer));
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outputBuffer[0] = REG_GPIOA;
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}
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void _writeGpioPort() override {
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I2CManager.write(_I2CAddress, 3, REG_GPIOA, _portOutputState, _portOutputState>>8);
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}
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void _writePullups() override {
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// Set pullups only for in-use pins. This prevents pullup being set for a pin that
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// is intended for use as an output but hasn't been written to yet.
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uint16_t temp = _portPullup & _portInUse;
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I2CManager.write(_I2CAddress, 3, REG_GPPUA, temp, temp>>8);
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}
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void _writePortModes() override {
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// Write 0 to IODIR for in-use pins that are outputs, 1 for others.
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uint16_t temp = ~(_portMode & _portInUse);
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I2CManager.write(_I2CAddress, 3, REG_IODIRA, temp, temp>>8);
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// Enable interrupt for in-use pins which are inputs (_portMode=0)
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temp = ~_portMode & _portInUse;
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I2CManager.write(_I2CAddress, 3, REG_INTCONA, 0x00, 0x00);
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I2CManager.write(_I2CAddress, 3, REG_GPINTENA, temp, temp>>8);
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}
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void _readGpioPort(bool immediate) override {
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if (immediate) {
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uint8_t buffer[2];
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I2CManager.read(_I2CAddress, buffer, 2, 1, REG_GPIOA);
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_portInputState = ((uint16_t)buffer[1]<<8) | buffer[0] | _portMode;
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} else {
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// Queue new request
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requestBlock.wait(); // Wait for preceding operation to complete
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// Issue new request to read GPIO register
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I2CManager.queueRequest(&requestBlock);
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}
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}
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// This function is invoked when an I/O operation on the requestBlock completes.
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void _processCompletion(uint8_t status) override {
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if (status == I2C_STATUS_OK)
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_portInputState = (((uint16_t)inputBuffer[1]<<8) | inputBuffer[0]) | _portMode;
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else
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_portInputState = 0xffff;
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}
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void _setupDevice() override {
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// IOCON is set MIRROR=1, ODR=1 (open drain shared interrupt pin)
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I2CManager.write(_I2CAddress, 2, REG_IOCON, 0x44);
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_writePortModes();
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_writePullups();
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_writeGpioPort();
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}
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uint8_t inputBuffer[2];
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uint8_t outputBuffer[1];
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enum {
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REG_IODIRA = 0x00,
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REG_IODIRB = 0x01,
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REG_GPINTENA = 0x04,
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REG_GPINTENB = 0x05,
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REG_INTCONA = 0x08,
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REG_INTCONB = 0x09,
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REG_IOCON = 0x0A,
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REG_GPPUA = 0x0C,
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REG_GPPUB = 0x0D,
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REG_GPIOA = 0x12,
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REG_GPIOB = 0x13,
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};
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};
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#endif |