MPC4451 I2C support
This commit is contained in:
parent
1f5c432e29
commit
26bfae58d4
4 changed files with 234 additions and 1 deletions
58
Marlin/src/HAL/HAL_LPC1768/include/Wire.h
Normal file
58
Marlin/src/HAL/HAL_LPC1768/include/Wire.h
Normal 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
|
|
@ -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
Normal file
4
Marlin/src/HAL/utility/twi.h
Normal file
|
@ -0,0 +1,4 @@
|
|||
// Modified for use with the mcp4451 digipot routine
|
||||
#if defined(TARGET_LPC1768)
|
||||
|
||||
#endif
|
|
@ -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
|
||||
|
|
Reference in a new issue