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Master-only TwoWire class for LPC1768

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This commit is contained in:
Thomas Moore 2017-11-09 21:46:26 -06:00 committed by Scott Lahteine
parent d5bf9e74c4
commit 6856eccc77
3 changed files with 275 additions and 26 deletions
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238
Marlin/src/HAL/HAL_LPC1768/Wire.cpp Normal file
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/*
TwoWire.cpp - TWI/I2C library for Wiring & Arduino
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef TARGET_LPC1768
extern "C" {
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <lpc17xx_i2c.h>
#include <lpc17xx_pinsel.h>
#include <lpc17xx_libcfg_default.h>
}
#include "Wire.h"
#define USEDI2CDEV_M 1
#if (USEDI2CDEV_M == 0)
#define I2CDEV_M LPC_I2C0
#elif (USEDI2CDEV_M == 1)
#define I2CDEV_M LPC_I2C1
#elif (USEDI2CDEV_M == 2)
#define I2CDEV_M LPC_I2C2
#else
#error "Master I2C device not defined!"
#endif
// Initialize Class Variables //////////////////////////////////////////////////
uint8_t TwoWire::rxBuffer[BUFFER_LENGTH];
uint8_t TwoWire::rxBufferIndex = 0;
uint8_t TwoWire::rxBufferLength = 0;
uint8_t TwoWire::txAddress = 0;
uint8_t TwoWire::txBuffer[BUFFER_LENGTH];
uint8_t TwoWire::txBufferIndex = 0;
uint8_t TwoWire::txBufferLength = 0;
uint8_t TwoWire::transmitting = 0;
// Constructors ////////////////////////////////////////////////////////////////
TwoWire::TwoWire() {
}
// Public Methods //////////////////////////////////////////////////////////////
void TwoWire::begin(void) {
rxBufferIndex = 0;
rxBufferLength = 0;
txBufferIndex = 0;
txBufferLength = 0;
/*
* Init I2C pin connect
*/
PINSEL_CFG_Type PinCfg;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
#if ((USEDI2CDEV_M == 0))
PinCfg.Funcnum = 1;
PinCfg.Pinnum = 27;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg); // SDA0 / D57 AUX-1
PinCfg.Pinnum = 28;
PINSEL_ConfigPin(&PinCfg); // SCL0 / D58 AUX-1
#endif
#if ((USEDI2CDEV_M == 1))
PinCfg.Funcnum = 3;
PinCfg.Pinnum = 0;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg); // SDA1 / D20 SCA
PinCfg.Pinnum = 1;
PINSEL_ConfigPin(&PinCfg); // SCL1 / D21 SCL
#endif
#if ((USEDI2CDEV_M == 2))
PinCfg.Funcnum = 2;
PinCfg.Pinnum = 10;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg); // SDA2 / D38 X_ENABLE_PIN
PinCfg.Pinnum = 11;
PINSEL_ConfigPin(&PinCfg); // SCL2 / D55 X_DIR_PIN
#endif
// Initialize I2C peripheral
I2C_Init(I2CDEV_M, 100000);
// Enable Master I2C operation
I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
}
uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity) {
// clamp to buffer length
if(quantity > BUFFER_LENGTH){
quantity = BUFFER_LENGTH;
}
// perform blocking read into buffer
I2C_M_SETUP_Type transferMCfg;
transferMCfg.sl_addr7bit = address >> 1; // not sure about the right shift
transferMCfg.tx_data = NULL;
transferMCfg.tx_length = 0;
transferMCfg.rx_data = rxBuffer;
transferMCfg.rx_length = quantity;
transferMCfg.retransmissions_max = 3;
I2C_MasterTransferData(I2CDEV_M, &transferMCfg, I2C_TRANSFER_POLLING);
// set rx buffer iterator vars
rxBufferIndex = 0;
rxBufferLength = transferMCfg.rx_count;
return transferMCfg.rx_count;
}
uint8_t TwoWire::requestFrom(int address, int quantity) {
return requestFrom((uint8_t)address, (uint8_t)quantity);
}
void TwoWire::beginTransmission(uint8_t address) {
// indicate that we are transmitting
transmitting = 1;
// set address of targeted slave
txAddress = address;
// reset tx buffer iterator vars
txBufferIndex = 0;
txBufferLength = 0;
}
void TwoWire::beginTransmission(int address) {
beginTransmission((uint8_t)address);
}
uint8_t TwoWire::endTransmission(void) {
// transmit buffer (blocking)
I2C_M_SETUP_Type transferMCfg;
transferMCfg.sl_addr7bit = txAddress >> 1; // not sure about the right shift
transferMCfg.tx_data = txBuffer;
transferMCfg.tx_length = txBufferLength;
transferMCfg.rx_data = NULL;
transferMCfg.rx_length = 0;
transferMCfg.retransmissions_max = 3;
Status status = I2C_MasterTransferData(I2CDEV_M, &transferMCfg, I2C_TRANSFER_POLLING);
// reset tx buffer iterator vars
txBufferIndex = 0;
txBufferLength = 0;
// indicate that we are done transmitting
transmitting = 0;
if (status == SUCCESS)
return 0; // success
else
return 4; // other error
}
// must be called after beginTransmission(address)
size_t TwoWire::write(uint8_t data) {
if (transmitting) {
// don't bother if buffer is full
if (txBufferLength >= BUFFER_LENGTH) {
return 0;
}
// put byte in tx buffer
txBuffer[txBufferIndex] = data;
++txBufferIndex;
// update amount in buffer
txBufferLength = txBufferIndex;
}
return 1;
}
// must be called after beginTransmission(address)
size_t TwoWire::write(const uint8_t *data, size_t quantity) {
size_t sent = 0;
if (transmitting)
for(sent = 0; sent < quantity; ++sent)
if (!write(data[sent]))
break;
return sent;
}
// must be called after requestFrom(address, numBytes)
int TwoWire::available(void) {
return rxBufferLength - rxBufferIndex;
}
// must be called after requestFrom(address, numBytes)
int TwoWire::read(void) {
int value = -1;
// get each successive byte on each call
if(rxBufferIndex < rxBufferLength) {
value = rxBuffer[rxBufferIndex];
++rxBufferIndex;
}
return value;
}
// must be called after requestFrom(address, numBytes)
int TwoWire::peek(void) {
int value = -1;
if(rxBufferIndex < rxBufferLength){
value = rxBuffer[rxBufferIndex];
}
return value;
}
// Preinstantiate Objects //////////////////////////////////////////////////////
TwoWire Wire = TwoWire();
#endif // TARGET_LPC1768

62
Marlin/src/HAL/HAL_LPC1768/include/Wire.h
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@ -1,4 +1,4 @@
/* /**
* TwoWire.h - TWI/I2C library for Arduino & Wiring * TwoWire.h - TWI/I2C library for Arduino & Wiring
* Copyright (c) 2006 Nicholas Zambetti. All right reserved. * Copyright (c) 2006 Nicholas Zambetti. All right reserved.
* *
@ -19,39 +19,49 @@
* Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts * Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
*/ */
// Modified for use with the mcp4451 digipot routine #ifndef _TWOWIRE_H_
#define _TWOWIRE_H_
#ifdef TARGET_LPC1768
#ifndef TwoWire_h
#define TwoWire_h
#include <inttypes.h> #include <inttypes.h>
#define BUFFER_LENGTH 32
class TwoWire { class TwoWire {
private:
static uint8_t rxBuffer[];
static uint8_t rxBufferIndex;
static uint8_t rxBufferLength;
static uint8_t txAddress;
static uint8_t txBuffer[];
static uint8_t txBufferIndex;
static uint8_t txBufferLength;
static uint8_t transmitting;
public: public:
//TwoWire(); TwoWire();
void begin(); void begin();
void beginTransmission(uint8_t); void beginTransmission(uint8_t);
void beginTransmission(int);
uint8_t endTransmission(void); uint8_t endTransmission(void);
size_t write(uint8_t); uint8_t endTransmission(uint8_t);
uint8_t requestFrom(uint8_t, uint8_t);
uint8_t requestFrom(int, int);
virtual size_t write(uint8_t);
virtual size_t write(const uint8_t *, size_t);
virtual int available(void);
virtual int read(void);
virtual int peek(void);
inline size_t write(unsigned long n) { return write((uint8_t)n); }
inline size_t write(long n) { return write((uint8_t)n); }
inline size_t write(unsigned int n) { return write((uint8_t)n); }
inline size_t write(int n) { return write((uint8_t)n); }
}; };
//extern TwoWire Wire; extern TwoWire Wire;
TwoWire Wire; #endif // _TWOWIRE_H_
////////////////////////////////////////////////////////////////////////////////////////
extern "C" uint8_t digipot_mcp4451_start(uint8_t sla);
extern "C" void digipot_mcp4451_init(void);
extern "C" uint8_t digipot_mcp4451_send_byte(uint8_t data);
void TwoWire::beginTransmission(uint8_t sla) { digipot_mcp4451_start(sla);}
void TwoWire::begin(void) {digipot_mcp4451_init();}
size_t TwoWire::write(uint8_t data) {return digipot_mcp4451_send_byte(data);}
uint8_t TwoWire::endTransmission(void) {return 1;}
#endif
#endif // TARGET_LPC1768

1
Marlin/src/feature/I2CPositionEncoder.cpp
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@ -37,6 +37,7 @@
#include "../module/temperature.h" #include "../module/temperature.h"
#include "../module/stepper.h" #include "../module/stepper.h"
#include "../gcode/parser.h" #include "../gcode/parser.h"
#include "binary.h"
#include <Wire.h> #include <Wire.h>