andrey
/
Marlin_FB4S
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

MPC4451 I2C support

pull/1/head
Bob-the-Kuhn 7 years ago
parent
1f5c432e29
commit
26bfae58d4
4 changed files with 234 additions and 1 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  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
View File

@ -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
View File

@ -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
View File

@ -0,0 +1,4 @@
// Modified for use with the mcp4451 digipot routine
#if defined(TARGET_LPC1768)
#endif

2
Marlin/src/module/stepper.h
View File

@ -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

Write Preview
Loading…
Cancel
Save