mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-23 12:51:24 +01:00
dab02ec659
Now compiles and works on PCA9548 Mux. Tested with MCP23017 and PCA9555 on the same Subbus
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/*
|
|
* © 2021, Neil McKechnie. All rights reserved.
|
|
*
|
|
* This file is part of DCC++EX API
|
|
*
|
|
* This is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* It is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef io_pca9555_h
|
|
#define io_pca9555_h
|
|
|
|
#include "IO_GPIOBase.h"
|
|
#include "FSH.h"
|
|
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
/*
|
|
* IODevice subclass for PCA9555 16-bit I/O expander (NXP & Texas Instruments).
|
|
*/
|
|
|
|
class PCA9555 : public GPIOBase<uint16_t> {
|
|
public:
|
|
static void create(VPIN vpin, uint8_t nPins, I2CAddress i2cAddress, int interruptPin=-1) {
|
|
if (checkNoOverlap(vpin, nPins, i2cAddress)) new PCA9555(vpin,nPins, i2cAddress, interruptPin);
|
|
}
|
|
|
|
private:
|
|
// Constructor
|
|
PCA9555(VPIN vpin, uint8_t nPins, I2CAddress I2CAddress, int interruptPin=-1)
|
|
: GPIOBase<uint16_t>((FSH *)F("PCA9555"), vpin, nPins, I2CAddress, interruptPin)
|
|
{
|
|
requestBlock.setRequestParams(_I2CAddress, inputBuffer, sizeof(inputBuffer),
|
|
outputBuffer, sizeof(outputBuffer));
|
|
outputBuffer[0] = REG_INPUT_P0;
|
|
}
|
|
void _writeGpioPort() override {
|
|
I2CManager.write(_I2CAddress, 3, REG_OUTPUT_P0, _portOutputState, _portOutputState>>8);
|
|
}
|
|
void _writePullups() override {
|
|
// Do nothing, pull-ups are always in place for input ports
|
|
// This function is here for HAL GPIOBase API compatibilitiy
|
|
|
|
}
|
|
void _writePortModes() override {
|
|
// Write 0 to REG_CONF_P0 & REG_CONF_P1 for in-use pins that are outputs, 1 for others.
|
|
// PCA9555 & TCA9555, Interrupt is always enabled for raising and falling edge
|
|
uint16_t temp = ~(_portMode & _portInUse);
|
|
I2CManager.write(_I2CAddress, 3, REG_CONF_P0, temp, temp>>8);
|
|
}
|
|
void _readGpioPort(bool immediate) override {
|
|
if (immediate) {
|
|
uint8_t buffer[2];
|
|
I2CManager.read(_I2CAddress, buffer, 2, 1, REG_INPUT_P0);
|
|
_portInputState = ((uint16_t)buffer[1]<<8) | buffer[0];
|
|
/* PCA9555 Int bug fix, from PCA9555 datasheet: "must change command byte to something besides 00h
|
|
* after a Read operation to the PCA9555 device or before reading from
|
|
* another device"
|
|
* Recommended solution, read from REG_OUTPUT_P0, then do nothing with the received data
|
|
* Issue not seen during testing, uncomment if needed
|
|
*/
|
|
//I2CManager.read(_I2CAddress, buffer, 2, 1, REG_OUTPUT_P0);
|
|
} else {
|
|
// Queue new request
|
|
requestBlock.wait(); // Wait for preceding operation to complete
|
|
// Issue new request to read GPIO register
|
|
I2CManager.queueRequest(&requestBlock);
|
|
}
|
|
}
|
|
// This function is invoked when an I/O operation on the requestBlock completes.
|
|
void _processCompletion(uint8_t status) override {
|
|
if (status == I2C_STATUS_OK)
|
|
_portInputState = ((uint16_t)inputBuffer[1]<<8) | inputBuffer[0];
|
|
else
|
|
_portInputState = 0xffff;
|
|
}
|
|
|
|
void _setupDevice() override {
|
|
// HAL API calls
|
|
_writePortModes();
|
|
_writePullups();
|
|
_writeGpioPort();
|
|
}
|
|
|
|
uint8_t inputBuffer[2];
|
|
uint8_t outputBuffer[1];
|
|
|
|
|
|
enum {
|
|
REG_INPUT_P0 = 0x00,
|
|
REG_INPUT_P1 = 0x01,
|
|
REG_OUTPUT_P0 = 0x02,
|
|
REG_OUTPUT_P1 = 0x03,
|
|
REG_POL_INV_P0 = 0x04,
|
|
REG_POL_INV_P1 = 0x05,
|
|
REG_CONF_P0 = 0x06,
|
|
REG_CONF_P1 = 0x07,
|
|
};
|
|
|
|
};
|
|
|
|
#endif
|