Scott Lahteine
GitHub
parent
07ae23fe14
commit
beeed580b8
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@ -23,22 +23,20 @@
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// adapted from I2C/master/master.c example
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// https://www-users.cs.york.ac.uk/~pcc/MCP/HAPR-Course-web/CMSIS/examples/html/master_8c_source.html
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#ifdef TARGET_LPC1768
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#include "../../../inc/MarlinConfigPre.h"
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#if MB(MKS_SBASE)
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#include "digipot_mcp4451_I2C_routines.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <lpc17xx_i2c.h>
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#include <lpc17xx_pinsel.h>
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#include <lpc17xx_libcfg_default.h>
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//////////////////////////////////////////////////////////////////////////////////////
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// These two routines are exact copies of the lpc17xx_i2c.c routines. Couldn't link to
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// to the lpc17xx_i2c.c routines so had to copy them into this file & rename them.
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static uint32_t _I2C_Start (LPC_I2C_TypeDef *I2Cx) {
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static uint32_t _I2C_Start(LPC_I2C_TypeDef *I2Cx) {
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// Reset STA, STO, SI
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
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@ -51,8 +49,8 @@ static uint32_t _I2C_Start (LPC_I2C_TypeDef *I2Cx) {
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return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
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}
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static void _I2C_Stop (LPC_I2C_TypeDef *I2Cx) {
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/* Make sure start bit is not active */
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static void _I2C_Stop(LPC_I2C_TypeDef *I2Cx) {
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// Make sure start bit is not active
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if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
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I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
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@ -60,34 +58,16 @@ static void _I2C_Stop (LPC_I2C_TypeDef *I2Cx) {
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
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}
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//////////////////////////////////////////////////////////////////////////////////////
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#define USEDI2CDEV_M 1 // use I2C1 controller
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#if (USEDI2CDEV_M == 0)
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#define I2CDEV_M LPC_I2C0
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#elif (USEDI2CDEV_M == 1)
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#define I2CDEV_M LPC_I2C1
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#elif (USEDI2CDEV_M == 2)
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#define I2CDEV_M LPC_I2C2
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#else
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#error "Master I2C device not defined!"
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#endif
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PINSEL_CFG_Type PinCfg;
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I2C_M_SETUP_Type transferMCfg;
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#define I2C_status (LPC_I2C1->I2STAT & I2C_STAT_CODE_BITMASK)
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uint8_t digipot_mcp4451_start(uint8_t sla) { // send slave address and write bit
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// Sometimes TX data ACK or NAK status is returned. That mean the start state didn't
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// happen which means only the value of the slave address was send. Keep looping until
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// the slave address and write bit are actually sent.
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do{
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do {
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_I2C_Stop(I2CDEV_M); // output stop state on I2C bus
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_I2C_Start(I2CDEV_M); // output start state on I2C bus
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while ((I2C_status != I2C_I2STAT_M_TX_START)
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@ -96,42 +76,38 @@ uint8_t digipot_mcp4451_start(uint8_t sla) { // send slave address and write bi
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&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for start to be asserted
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LPC_I2C1->I2CONCLR = I2C_I2CONCLR_STAC; // clear start state before tansmitting slave address
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LPC_I2C1->I2DAT = (sla <<1) & I2C_I2DAT_BITMASK; // transmit slave address & write bit
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LPC_I2C1->I2DAT = (sla << 1) & I2C_I2DAT_BITMASK; // transmit slave address & write bit
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LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
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LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
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while ((I2C_status != I2C_I2STAT_M_TX_SLAW_ACK)
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&& (I2C_status != I2C_I2STAT_M_TX_SLAW_NACK)
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&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
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&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for slaw to finish
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}while ( (I2C_status == I2C_I2STAT_M_TX_DAT_ACK) || (I2C_status == I2C_I2STAT_M_TX_DAT_NACK));
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&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)) { /* wait for slaw to finish */ }
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} while ( (I2C_status == I2C_I2STAT_M_TX_DAT_ACK) || (I2C_status == I2C_I2STAT_M_TX_DAT_NACK));
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return 1;
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}
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void digipot_mcp4451_init(void) {
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/**
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* Init I2C pin connect
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*/
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PinCfg.OpenDrain = 0;
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PinCfg.Pinmode = 0;
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#if ((USEDI2CDEV_M == 0))
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#if USEDI2CDEV_M == 0
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PinCfg.Funcnum = 1;
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PinCfg.Pinnum = 27;
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PinCfg.Portnum = 0;
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PINSEL_ConfigPin(&PinCfg); // SDA0 / D57 AUX-1
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PinCfg.Pinnum = 28;
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PINSEL_ConfigPin(&PinCfg); // SCL0 / D58 AUX-1
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#endif
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#if ((USEDI2CDEV_M == 1))
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#elif USEDI2CDEV_M == 1
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PinCfg.Funcnum = 3;
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PinCfg.Pinnum = 0;
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PinCfg.Portnum = 0;
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PINSEL_ConfigPin(&PinCfg); // SDA1 / D20 SCA
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PinCfg.Pinnum = 1;
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PINSEL_ConfigPin(&PinCfg); // SCL1 / D21 SCL
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#endif
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#if ((USEDI2CDEV_M == 2))
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#elif USEDI2CDEV_M == 2
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PinCfg.Funcnum = 2;
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PinCfg.Pinnum = 10;
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PinCfg.Portnum = 0;
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@ -142,16 +118,15 @@ void digipot_mcp4451_init(void) {
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// Initialize I2C peripheral
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I2C_Init(I2CDEV_M, 400000); // hardwired to 400KHz bit rate, 100KHz is the other option
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/* Enable Master I2C operation */
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// Enable Master I2C operation
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I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
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}
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uint8_t digipot_mcp4451_send_byte(uint8_t data) {
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LPC_I2C1->I2DAT = data & I2C_I2DAT_BITMASK; // transmit data
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LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
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LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
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while ((I2C_status != I2C_I2STAT_M_TX_DAT_ACK) && (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); // wait for xmit to finish
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while (I2C_status != I2C_I2STAT_M_TX_DAT_ACK && I2C_status != I2C_I2STAT_M_TX_DAT_NACK); // wait for xmit to finish
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return 1;
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}
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@ -159,4 +134,4 @@ uint8_t digipot_mcp4451_send_byte(uint8_t data) {
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}
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#endif
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#endif // TARGET_LPC1768
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#endif // MB(MKS_SBASE)
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@ -0,0 +1,57 @@
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/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016, 2017 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// adapted from I2C/master/master.c example
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// https://www-users.cs.york.ac.uk/~pcc/MCP/HAPR-Course-web/CMSIS/examples/html/master_8c_source.html
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#ifndef _DIGIPOT_MCP4451_I2C_ROUTINES_H_
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#define _DIGIPOT_MCP4451_I2C_ROUTINES_H_
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#define USEDI2CDEV_M 1 // use I2C1 controller
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#if USEDI2CDEV_M == 0
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#define I2CDEV_M LPC_I2C0
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#elif USEDI2CDEV_M == 1
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#define I2CDEV_M LPC_I2C1
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#elif USEDI2CDEV_M == 2
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#define I2CDEV_M LPC_I2C2
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#else
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#error "Master I2C device not defined!"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <lpc17xx_i2c.h>
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#include <lpc17xx_pinsel.h>
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#include <lpc17xx_libcfg_default.h>
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uint8_t digipot_mcp4451_start(uint8_t sla);
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void digipot_mcp4451_init(void);
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uint8_t digipot_mcp4451_send_byte(uint8_t data);
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#ifdef __cplusplus
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}
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#endif
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#endif // _DIGIPOT_MCP4451_I2C_ROUTINES_H_
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@ -27,6 +27,10 @@
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#include "Stream.h"
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#include <Wire.h>
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#if MB(MKS_SBASE)
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#include "digipot_mcp4451_I2C_routines.h"
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#endif
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// Settings for the I2C based DIGIPOT (MCP4451) on Azteeg X3 Pro
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#if MB(5DPRINT)
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#define DIGIPOT_I2C_FACTOR 117.96
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@ -41,10 +45,16 @@ static byte current_to_wiper(const float current) {
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}
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static void i2c_send(const byte addr, const byte a, const byte b) {
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#if MB(MKS_SBASE)
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digipot_mcp4451_start(addr);
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digipot_mcp4451_send_byte(a);
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digipot_mcp4451_send_byte(b);
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#else
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Wire.beginTransmission(addr);
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Wire.write(a);
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Wire.write(b);
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Wire.endTransmission();
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#endif
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}
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// This is for the MCP4451 I2C based digipot
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@ -63,9 +73,13 @@ void digipot_i2c_set_current(const uint8_t channel, const float current) {
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}
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void digipot_i2c_init() {
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static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
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#if MB(MKS_SBASE)
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digipot_mcp4451_init();
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#else
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Wire.begin();
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#endif
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// setup initial currents as defined in Configuration_adv.h
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static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
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for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
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digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
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}
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