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/**
* Marlin 3D Printer Firmware
* Copyright (c) 2020 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 <https://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
#ifdef TARGET_LPC1768
#include "../include/i2c_util.h"
#include "../../../core/millis_t.h"
extern int millis();
#ifdef __cplusplus
extern "C" {
#endif
//////////////////////////////////////////////////////////////////////////////////////
// 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 I2CDEV_S_ADDR 0x78 // from SSD1306 //actual address is 0x3C - shift left 1 with LSB set to 0 to indicate write
#define BUFFER_SIZE 0x1 // only do single byte transfers with LCDs
I2C_M_SETUP_Type transferMCfg;
#define I2C_status (LPC_I2C1->I2STAT & I2C_STAT_CODE_BITMASK)
// Send slave address and write bit
uint8_t u8g_i2c_start(const uint8_t sla) {
// 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 = I2CDEV_S_ADDR & 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 u8g_i2c_init(const uint8_t clock_option) {
configure_i2c(clock_option);
u8g_i2c_start(0); // Send slave address and write bit
}
uint8_t u8g_i2c_send_byte(uint8_t data) {
#define I2C_TIMEOUT 3
LPC_I2C1->I2DAT = data & I2C_I2DAT_BITMASK; // transmit data
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
const millis_t timeout = millis() + I2C_TIMEOUT;
while ((I2C_status != I2C_I2STAT_M_TX_DAT_ACK) && (I2C_status != I2C_I2STAT_M_TX_DAT_NACK) && PENDING(millis(), timeout)); // wait for xmit to finish
// had hangs with SH1106 so added time out - have seen temporary screen corruption when this happens
return 1;
}
void u8g_i2c_stop() {
}
#ifdef __cplusplus
}
#endif
#endif // TARGET_LPC1768
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