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Merge pull request #7935 from Bob-the-Kuhn/Digipot-MCP4451 

2.0.x - MPC4451 I2C support
pull/1/head
Bob-the-Kuhn 7 years ago
committed by GitHub
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1f5c432e29 26bfae58d4
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e9cf9ad3f3
4 changed files with 234 additions and 1 deletions
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  1. 58
      Marlin/src/HAL/HAL_LPC1768/include/Wire.h
  2. 171
      Marlin/src/HAL/HAL_LPC1768/include/digipot_mcp4451_I2C_routines.c
  3. 4
      Marlin/src/HAL/utility/twi.h
  4. 2
      Marlin/src/module/stepper.h

58
Marlin/src/HAL/HAL_LPC1768/include/Wire.h
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@ -0,0 +1,58 @@
/*
TwoWire.h - TWI/I2C library for Arduino & Wiring
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
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
*/
// Modified for use with the mcp4451 digipot routine
#if defined(TARGET_LPC1768)
#ifndef TwoWire_h
#define TwoWire_h
#include <inttypes.h>
class TwoWire
{
public:
// TwoWire();
void begin();
void beginTransmission(uint8_t);
uint8_t endTransmission(void);
size_t write(uint8_t);
};
//extern TwoWire Wire;//
TwoWire Wire;
////////////////////////////////////////////////////////////////////////////////////////
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

171
Marlin/src/HAL/HAL_LPC1768/include/digipot_mcp4451_I2C_routines.c
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@ -0,0 +1,171 @@
/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
*
* Based on Sprinter and grbl.
* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// adapted from I2C/master/master.c example
// https://www-users.cs.york.ac.uk/~pcc/MCP/HAPR-Course-web/CMSIS/examples/html/master_8c_source.html
#if defined(TARGET_LPC1768)
#ifdef __cplusplus
extern "C" {
#endif
#include <lpc17xx_i2c.h>
#include <lpc17xx_pinsel.h>
#include <lpc17xx_libcfg_default.h>
//////////////////////////////////////////////////////////////////////////////////////
// These two routines are exact copies of the lpc17xx_i2c.c routines. Couldn't link to
// to the lpc17xx_i2c.c routines so had to copy them into this file & rename them.
static uint32_t _I2C_Start (LPC_I2C_TypeDef *I2Cx)
{
// Reset STA, STO, SI
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
// Enter to Master Transmitter mode
I2Cx->I2CONSET = I2C_I2CONSET_STA;
// Wait for complete
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
}
static void _I2C_Stop (LPC_I2C_TypeDef *I2Cx)
{
/* Make sure start bit is not active */
if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
{
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
}
I2Cx->I2CONSET = I2C_I2CONSET_STO|I2C_I2CONSET_AA;
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
}
//////////////////////////////////////////////////////////////////////////////////////
#define USEDI2CDEV_M 1 // use I2C1 controller
#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
PINSEL_CFG_Type PinCfg;
I2C_M_SETUP_Type transferMCfg;
#define I2C_status (LPC_I2C1->I2STAT & I2C_STAT_CODE_BITMASK)
uint8_t digipot_mcp4451_start(uint8_t sla) { // send slave address and write bit
// Sometimes TX data ACK or NAK status is returned. That mean the start state didn't
// happen which means only the value of the slave address was send. Keep looping until
// the slave address and write bit are actually sent.
do{
_I2C_Stop(I2CDEV_M); // output stop state on I2C bus
_I2C_Start(I2CDEV_M); // output start state on I2C bus
while ((I2C_status != I2C_I2STAT_M_TX_START)
&& (I2C_status != I2C_I2STAT_M_TX_RESTART)
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for start to be asserted
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_STAC; // clear start state before tansmitting slave address
LPC_I2C1->I2DAT = (sla <<1) & I2C_I2DAT_BITMASK; // transmit slave address & write bit
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
while ((I2C_status != I2C_I2STAT_M_TX_SLAW_ACK)
&& (I2C_status != I2C_I2STAT_M_TX_SLAW_NACK)
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for slaw to finish
}while ( (I2C_status == I2C_I2STAT_M_TX_DAT_ACK) || (I2C_status == I2C_I2STAT_M_TX_DAT_NACK));
return 1;
}
void digipot_mcp4451_init(void) {
/*
* Init I2C pin connect
*/
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, 400000); // hardwired to 400KHz bit rate, 100KHz is the other option
/* Enable Master I2C operation */
I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
}
uint8_t digipot_mcp4451_send_byte(uint8_t data) {
LPC_I2C1->I2DAT = data & I2C_I2DAT_BITMASK; // transmit data
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
while ((I2C_status != I2C_I2STAT_M_TX_DAT_ACK) && (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); // wait for xmit to finish
return 1;
}
#ifdef __cplusplus
}
#endif
#endif

4
Marlin/src/HAL/utility/twi.h
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@ -0,0 +1,4 @@
// Modified for use with the mcp4451 digipot routine
#if defined(TARGET_LPC1768)
#endif

2
Marlin/src/module/stepper.h
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@ -297,7 +297,7 @@ class Stepper {
#ifdef CPU_32_BIT
// In case of high-performance processor, it is able to calculate in real-time
constexpr uint32_t MIN_TIME_PER_STEP = (HAL_STEPPER_TIMER_RATE) / ((STEP_DOUBLER_FREQUENCY) * 2);
const uint32_t MIN_TIME_PER_STEP = (HAL_STEPPER_TIMER_RATE) / ((STEP_DOUBLER_FREQUENCY) * 2);
timer = uint32_t(HAL_STEPPER_TIMER_RATE) / step_rate;
NOLESS(timer, MIN_TIME_PER_STEP); // (STEP_DOUBLER_FREQUENCY * 2 kHz - this should never happen)
#else

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