mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-23 21:01:25 +01:00
173676287c
If an extended I2C address is specified (including mux and/or subbus) then these parameters are ignored, but a warning output to the diagnostic console.
359 lines
13 KiB
C++
359 lines
13 KiB
C++
/*
|
|
* © 2023, Neil McKechnie
|
|
* © 2022 Paul M Antoine
|
|
* All rights reserved.
|
|
*
|
|
* This file is part of CommandStation-EX
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#include "I2CManager.h"
|
|
#include "DIAG.h"
|
|
|
|
// Include target-specific portions of I2CManager class
|
|
#if defined(I2C_USE_WIRE)
|
|
#include "I2CManager_Wire.h"
|
|
#elif defined(ARDUINO_ARCH_AVR)
|
|
#include "I2CManager_NonBlocking.h"
|
|
#include "I2CManager_AVR.h" // Uno/Nano/Mega2560
|
|
#elif defined(ARDUINO_ARCH_MEGAAVR)
|
|
#include "I2CManager_NonBlocking.h"
|
|
#include "I2CManager_Mega4809.h" // NanoEvery/UnoWifi
|
|
#elif defined(ARDUINO_ARCH_SAMD)
|
|
#include "I2CManager_NonBlocking.h"
|
|
#include "I2CManager_SAMD.h" // SAMD21 for now... SAMD51 as well later
|
|
#elif defined(ARDUINO_ARCH_STM32)
|
|
#include "I2CManager_NonBlocking.h"
|
|
#include "I2CManager_STM32.h" // STM32F411RE for now... more later
|
|
#else
|
|
#define I2C_USE_WIRE
|
|
#include "I2CManager_Wire.h" // Other platforms
|
|
#endif
|
|
|
|
|
|
// Helper function for listing device types
|
|
static const FSH * guessI2CDeviceType(uint8_t address) {
|
|
if (address >= 0x20 && address <= 0x26)
|
|
return F("GPIO Expander");
|
|
else if (address == 0x27)
|
|
return F("GPIO Expander or LCD Display");
|
|
else if (address == 0x29)
|
|
return F("Time-of-flight sensor");
|
|
else if (address >= 0x3c && address <= 0x3d)
|
|
return F("OLED Display");
|
|
else if (address >= 0x48 && address <= 0x4f)
|
|
return F("Analogue Inputs or PWM");
|
|
else if (address >= 0x40 && address <= 0x4f)
|
|
return F("PWM");
|
|
else if (address >= 0x50 && address <= 0x5f)
|
|
return F("EEPROM");
|
|
else if (address >= 0x70 && address <= 0x77)
|
|
return F("I2C Mux");
|
|
else
|
|
return F("?");
|
|
}
|
|
|
|
// If not already initialised, initialise I2C
|
|
void I2CManagerClass::begin(void) {
|
|
if (!_beginCompleted) {
|
|
_beginCompleted = true;
|
|
_initialise();
|
|
|
|
#if defined(I2C_USE_WIRE)
|
|
DIAG(F("I2CManager: Using Wire library"));
|
|
#endif
|
|
|
|
// Check for short-circuits on I2C
|
|
if (!digitalRead(SDA))
|
|
DIAG(F("WARNING: Possible short-circuit on I2C SDA line"));
|
|
if (!digitalRead(SCL))
|
|
DIAG(F("WARNING: Possible short-circuit on I2C SCL line"));
|
|
|
|
// Probe and list devices. Use standard mode
|
|
// (clock speed 100kHz) for best device compatibility.
|
|
_setClock(100000);
|
|
unsigned long originalTimeout = _timeout;
|
|
setTimeout(1000); // use 1ms timeout for probes
|
|
|
|
#if defined(I2C_EXTENDED_ADDRESS)
|
|
// First count the multiplexers and switch off all subbuses
|
|
_muxCount = 0;
|
|
for (uint8_t muxNo=I2CMux_0; muxNo <= I2CMux_7; muxNo++) {
|
|
if (I2CManager.muxSelectSubBus({(I2CMux)muxNo, SubBus_None})==I2C_STATUS_OK)
|
|
_muxCount++;
|
|
}
|
|
#endif
|
|
|
|
// Enumerate devices that are visible
|
|
bool found = false;
|
|
for (uint8_t addr=0x08; addr<0x78; addr++) {
|
|
if (exists(addr)) {
|
|
found = true;
|
|
DIAG(F("I2C Device found at 0x%x, %S?"), addr, guessI2CDeviceType(addr));
|
|
}
|
|
}
|
|
|
|
#if defined(I2C_EXTENDED_ADDRESS)
|
|
// Enumerate all I2C devices that are connected via multiplexer,
|
|
// i.e. that respond when only one multiplexer has one subBus enabled
|
|
// and the device doesn't respond when the mux subBus is disabled.
|
|
// If any probes time out, then assume that the subbus is dead and
|
|
// don't do any more on that subbus.
|
|
for (uint8_t muxNo=I2CMux_0; muxNo <= I2CMux_7; muxNo++) {
|
|
uint8_t muxAddr = I2C_MUX_BASE_ADDRESS + muxNo;
|
|
if (exists(muxAddr)) {
|
|
// Select Mux Subbus
|
|
for (uint8_t subBus=0; subBus<=SubBus_No; subBus++) {
|
|
muxSelectSubBus({(I2CMux)muxNo, (I2CSubBus)subBus});
|
|
for (uint8_t addr=0x08; addr<0x78; addr++) {
|
|
uint8_t status = checkAddress(addr);
|
|
if (status == I2C_STATUS_OK) {
|
|
// De-select subbus
|
|
muxSelectSubBus({(I2CMux)muxNo, SubBus_None});
|
|
if (!exists(addr)) {
|
|
// Device responds when subbus selected but not when
|
|
// subbus disabled - ergo it must be on subbus!
|
|
found = true;
|
|
DIAG(F("I2C Device found at {I2CMux_%d,SubBus_%d,0x%x}, %S?"),
|
|
muxNo, subBus, addr, guessI2CDeviceType(addr));
|
|
}
|
|
// Re-select subbus
|
|
muxSelectSubBus({(I2CMux)muxNo, (I2CSubBus)subBus});
|
|
} else if (status == I2C_STATUS_TIMEOUT) {
|
|
// Bus stuck, skip to next one.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// Deselect all subBuses for this mux. Otherwise its devices will continue to
|
|
// respond when other muxes are being probed.
|
|
I2CManager.muxSelectSubBus({(I2CMux)muxNo, SubBus_None}); // Deselect Mux
|
|
}
|
|
}
|
|
#endif
|
|
if (!found) DIAG(F("No I2C Devices found"));
|
|
_setClock(_clockSpeed);
|
|
setTimeout(originalTimeout); // set timeout back to original
|
|
}
|
|
}
|
|
|
|
// Set clock speed to the lowest requested one. If none requested,
|
|
// the Wire default is 100kHz.
|
|
void I2CManagerClass::setClock(uint32_t speed) {
|
|
if (speed < _clockSpeed && !_clockSpeedFixed) {
|
|
_clockSpeed = speed;
|
|
DIAG(F("I2C clock speed set to %l Hz"), _clockSpeed);
|
|
}
|
|
_setClock(_clockSpeed);
|
|
}
|
|
|
|
// Force clock speed to that specified.
|
|
void I2CManagerClass::forceClock(uint32_t speed) {
|
|
_clockSpeed = speed;
|
|
_clockSpeedFixed = true;
|
|
_setClock(_clockSpeed);
|
|
DIAG(F("I2C clock speed forced to %l Hz"), _clockSpeed);
|
|
}
|
|
|
|
// Check if specified I2C address is responding (blocking operation)
|
|
// Returns I2C_STATUS_OK (0) if OK, or error code.
|
|
// Suppress retries. If it doesn't respond first time it's out of the running.
|
|
uint8_t I2CManagerClass::checkAddress(I2CAddress address) {
|
|
I2CRB rb;
|
|
rb.setWriteParams(address, NULL, 0);
|
|
rb.suppressRetries(true);
|
|
queueRequest(&rb);
|
|
return rb.wait();
|
|
}
|
|
|
|
|
|
/***************************************************************************
|
|
* Write a transmission to I2C using a list of data (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::write(I2CAddress address, uint8_t nBytes, ...) {
|
|
uint8_t buffer[nBytes];
|
|
va_list args;
|
|
va_start(args, nBytes);
|
|
for (uint8_t i=0; i<nBytes; i++)
|
|
buffer[i] = va_arg(args, int);
|
|
va_end(args);
|
|
return write(address, buffer, nBytes);
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Initiate a write to an I2C device (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::write(I2CAddress i2cAddress, const uint8_t writeBuffer[], uint8_t writeLen) {
|
|
I2CRB req;
|
|
uint8_t status = write(i2cAddress, writeBuffer, writeLen, &req);
|
|
return finishRB(&req, status);
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Initiate a write from PROGMEM (flash) to an I2C device (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::write_P(I2CAddress i2cAddress, const uint8_t * data, uint8_t dataLen) {
|
|
I2CRB req;
|
|
uint8_t status = write_P(i2cAddress, data, dataLen, &req);
|
|
return finishRB(&req, status);
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Initiate a write (optional) followed by a read from the I2C device (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::read(I2CAddress i2cAddress, uint8_t *readBuffer, uint8_t readLen,
|
|
const uint8_t *writeBuffer, uint8_t writeLen)
|
|
{
|
|
I2CRB req;
|
|
uint8_t status = read(i2cAddress, readBuffer, readLen, writeBuffer, writeLen, &req);
|
|
return finishRB(&req, status);
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Overload of read() to allow command to be specified as a series of bytes (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::read(I2CAddress address, uint8_t readBuffer[], uint8_t readSize,
|
|
uint8_t writeSize, ...) {
|
|
va_list args;
|
|
// Copy the series of bytes into an array.
|
|
va_start(args, writeSize);
|
|
uint8_t writeBuffer[writeSize];
|
|
for (uint8_t i=0; i<writeSize; i++)
|
|
writeBuffer[i] = va_arg(args, int);
|
|
va_end(args);
|
|
return read(address, readBuffer, readSize, writeBuffer, writeSize);
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Finish off request block by posting status, etc. (blocking operation)
|
|
***************************************************************************/
|
|
uint8_t I2CManagerClass::finishRB(I2CRB *rb, uint8_t status) {
|
|
if ((status == I2C_STATUS_OK) && rb)
|
|
status = rb->wait();
|
|
return status;
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Get a message corresponding to the error status
|
|
***************************************************************************/
|
|
const FSH *I2CManagerClass::getErrorMessage(uint8_t status) {
|
|
switch (status) {
|
|
case I2C_STATUS_OK: return F("OK");
|
|
case I2C_STATUS_TRUNCATED: return F("Transmission truncated");
|
|
case I2C_STATUS_NEGATIVE_ACKNOWLEDGE: return F("No response from device (address NAK)");
|
|
case I2C_STATUS_TRANSMIT_ERROR: return F("Transmit error (data NAK)");
|
|
case I2C_STATUS_OTHER_TWI_ERROR: return F("Other Wire/TWI error");
|
|
case I2C_STATUS_TIMEOUT: return F("I2C bus timeout");
|
|
case I2C_STATUS_ARBITRATION_LOST: return F("Arbitration lost");
|
|
case I2C_STATUS_BUS_ERROR: return F("I2C bus error");
|
|
case I2C_STATUS_UNEXPECTED_ERROR: return F("Unexpected error");
|
|
case I2C_STATUS_PENDING: return F("Request pending");
|
|
default: return F("Error code not recognised");
|
|
}
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Declare singleton class instance.
|
|
***************************************************************************/
|
|
I2CManagerClass I2CManager = I2CManagerClass();
|
|
|
|
// Buffer for conversion of I2CAddress to char*.
|
|
/* static */ char I2CAddress::addressBuffer[30];
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
// Helper functions associated with I2C Request Block
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
/***************************************************************************
|
|
* Block waiting for request to complete, and return completion status.
|
|
* Timeout monitoring is performed in the I2CManager.loop() function.
|
|
***************************************************************************/
|
|
uint8_t I2CRB::wait() {
|
|
while (status==I2C_STATUS_PENDING) {
|
|
I2CManager.loop();
|
|
};
|
|
return status;
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Check whether request is still in progress.
|
|
* Timeout monitoring is performed in the I2CManager.loop() function.
|
|
***************************************************************************/
|
|
bool I2CRB::isBusy() {
|
|
if (status==I2C_STATUS_PENDING) {
|
|
I2CManager.loop();
|
|
return true;
|
|
} else
|
|
return false;
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Helper functions to fill the I2CRequest structure with parameters.
|
|
***************************************************************************/
|
|
void I2CRB::setReadParams(I2CAddress i2cAddress, uint8_t *readBuffer, uint8_t readLen) {
|
|
this->i2cAddress = i2cAddress;
|
|
this->writeLen = 0;
|
|
this->readBuffer = readBuffer;
|
|
this->readLen = readLen;
|
|
this->operation = OPERATION_READ;
|
|
this->status = I2C_STATUS_OK;
|
|
}
|
|
|
|
void I2CRB::setRequestParams(I2CAddress i2cAddress, uint8_t *readBuffer, uint8_t readLen,
|
|
const uint8_t *writeBuffer, uint8_t writeLen) {
|
|
this->i2cAddress = i2cAddress;
|
|
this->writeBuffer = writeBuffer;
|
|
this->writeLen = writeLen;
|
|
this->readBuffer = readBuffer;
|
|
this->readLen = readLen;
|
|
this->operation = OPERATION_REQUEST;
|
|
this->status = I2C_STATUS_OK;
|
|
}
|
|
|
|
void I2CRB::setWriteParams(I2CAddress i2cAddress, const uint8_t *writeBuffer, uint8_t writeLen) {
|
|
this->i2cAddress = i2cAddress;
|
|
this->writeBuffer = writeBuffer;
|
|
this->writeLen = writeLen;
|
|
this->readLen = 0;
|
|
this->operation = OPERATION_SEND;
|
|
this->status = I2C_STATUS_OK;
|
|
}
|
|
|
|
void I2CRB::suppressRetries(bool suppress) {
|
|
if (suppress)
|
|
this->operation |= OPERATION_NORETRY;
|
|
else
|
|
this->operation &= ~OPERATION_NORETRY;
|
|
}
|
|
|
|
|
|
// Helper function for converting a uint8_t to four characters (e.g. 0x23).
|
|
void I2CAddress::toHex(const uint8_t value, char *buffer) {
|
|
char *ptr = buffer;
|
|
// Just display hex value, two digits.
|
|
*ptr++ = '0';
|
|
*ptr++ = 'x';
|
|
uint8_t bits = (value >> 4) & 0xf;
|
|
*ptr++ = bits > 9 ? bits-10+'a' : bits+'0';
|
|
bits = value & 0xf;
|
|
*ptr++ = bits > 9 ? bits-10+'a' : bits+'0';
|
|
}
|
|
|
|
#if !defined(I2C_EXTENDED_ADDRESS)
|
|
|
|
/* static */ bool I2CAddress::_addressWarningDone = false;
|
|
|
|
#endif |