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fc660c/fc980c: clean up actuation point adjustment code (#21964)

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Co-authored-by: Joel Challis <git@zvecr.com>
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Ryan 2023-09-14 13:57:10 +10:00 committed by GitHub
parent 20cbe372a6
commit f9ed1e3ebc
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20 changed files with 254 additions and 630 deletions
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87
keyboards/fc660c/actuation_point.c
View file

@ -1,87 +0,0 @@
/*
Copyright 2017 Balz Guenat
based on work by Jun Wako <wakojun@gmail.com>
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 2 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/>.
*/
#include "actuation_point.h"
#include "i2c.h"
///////////////////////////////////////////////////////////////////////////////
//
// AD5258 I2C digital potentiometer
// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
//
#define AD5258_ADDR 0b0011000
#define AD5258_INST_RDAC 0x00
#define AD5258_INST_EEPROM 0x20
uint8_t read_rdac(void) {
// read RDAC register
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_RDAC);
i2c_start_read(AD5258_ADDR);
uint8_t ret = i2c_master_read(I2C_NACK);
i2c_master_stop();
return ret;
};
uint8_t read_eeprom(void) {
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_EEPROM);
i2c_start_read(AD5258_ADDR);
uint8_t ret = i2c_master_read(I2C_NACK);
i2c_master_stop();
return ret;
};
void write_rdac(uint8_t rdac) {
// write RDAC register:
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_RDAC);
i2c_master_write(rdac & 0x3F);
i2c_master_stop();
};
void actuation_point_up(void) {
// write RDAC register: lower value makes actuation point shallow
uint8_t rdac = read_rdac();
if (rdac == 0)
write_rdac(0);
else
write_rdac(rdac-1);
};
void actuation_point_down(void) {
// write RDAC register: higher value makes actuation point deep
uint8_t rdac = read_rdac();
if (rdac == 63)
write_rdac(63);
else
write_rdac(rdac+1);
};
void adjust_actuation_point(int offset) {
i2c_master_init();
uint8_t rdac = read_eeprom() + offset;
if (rdac > 63) { // protects from under and overflows
if (offset > 0)
write_rdac(63);
else
write_rdac(0);
} else {
write_rdac(rdac);
}
}

52
keyboards/fc660c/ad5258.c Normal file
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@ -0,0 +1,52 @@
/*
Copyright 2017 Balz Guenat
based on work by Jun Wako <wakojun@gmail.com>
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 2 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/>.
*/
#include "ad5258.h"
#include "i2c_master.h"
///////////////////////////////////////////////////////////////////////////////
//
// AD5258 I2C digital potentiometer
// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
//
#define AD5258_I2C_ADDRESS 0x18
#define AD5258_INST_RDAC 0x00
#define AD5258_INST_EEPROM 0x20
void ad5258_init(void) {
i2c_init();
}
uint8_t ad5258_read_rdac(void) {
// read RDAC register
uint8_t ret = 0;
i2c_readReg(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &ret, 1, 100);
return ret;
}
uint8_t ad5258_read_eeprom(void) {
uint8_t ret = 0;
i2c_readReg(AD5258_I2C_ADDRESS, AD5258_INST_EEPROM, &ret, 1, 100);
return ret;
}
void ad5258_write_rdac(uint8_t rdac) {
// write RDAC register:
uint8_t data = rdac & 0x3F;
i2c_writeReg(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &data, 1, 100);
}

28
keyboards/fc660c/ad5258.h Normal file
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@ -0,0 +1,28 @@
/*
Copyright 2017 Balz Guenat
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 2 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/>.
*/
#pragma once
#include <stdint.h>
void ad5258_init(void);
uint8_t ad5258_read_rdac(void);
uint8_t ad5258_read_eeprom(void);
void ad5258_write_rdac(uint8_t rdac);

2
keyboards/fc660c/config.h
View file

@ -27,8 +27,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
* These options are also useful to firmware size reduction.
*/
#define USE_I2C
/* disable debug print */
//#define NO_DEBUG

45
keyboards/fc660c/fc660c.c
View file

@ -14,16 +14,47 @@ 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/>.
*/
#include "quantum.h"
#include "fc660c.h"
#ifdef ACTUATION_DEPTH_ADJUSTMENT
#include "actuation_point.h"
#endif
void matrix_init_kb(void) {
#ifdef ACTUATION_DEPTH_ADJUSTMENT
adjust_actuation_point(ACTUATION_DEPTH_ADJUSTMENT);
#endif
matrix_init_user();
matrix_init_user();
}
void actuation_point_up(void) {
// write RDAC register: lower value makes actuation point shallow
uint8_t rdac = ad5258_read_rdac();
if (rdac == 0) {
ad5258_write_rdac(0);
} else {
ad5258_write_rdac(rdac - 1);
}
}
void actuation_point_down(void) {
// write RDAC register: higher value makes actuation point deep
uint8_t rdac = ad5258_read_rdac();
if (rdac == 63) {
ad5258_write_rdac(63);
} else {
ad5258_write_rdac(rdac + 1);
}
}
void adjust_actuation_point(int offset) {
ad5258_init();
uint8_t rdac = ad5258_read_eeprom() + offset;
if (rdac > 63) { // protects from under and overflows
if (offset > 0) {
ad5258_write_rdac(63);
} else {
ad5258_write_rdac(0);
}
} else {
ad5258_write_rdac(rdac);
}
}
#endif

8
keyboards/fc980c/actuation_point.h → keyboards/fc660c/fc660c.h
View file

@ -17,13 +17,15 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#pragma once
#include <stdint.h>
#include "quantum.h"
#ifdef ACTUATION_DEPTH_ADJUSTMENT
# include "ad5258.h"
// see keymaps/actuation-point-example to see how these functions can be used.
uint8_t read_rdac(void);
uint8_t read_eeprom(void);
void actuation_point_up(void);
void actuation_point_down(void);
// be careful with this.
void adjust_actuation_point(int offset);
#endif

162
keyboards/fc660c/i2c.c
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@ -1,162 +0,0 @@
#include <util/twi.h>
#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include <stdbool.h>
#include "i2c.h"
#ifdef USE_I2C
// Limits the amount of we wait for any one i2c transaction.
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
// 9 bits, a single transaction will take around 90μs to complete.
//
// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit
// poll loop takes at least 8 clock cycles to execute
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
static volatile uint8_t slave_buffer_pos;
static volatile bool slave_has_register_set = false;
// Wait for an i2c operation to finish
inline static
void i2c_delay(void) {
uint16_t lim = 0;
while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
lim++;
// easier way, but will wait slightly longer
// _delay_us(100);
}
// Setup twi to run at 100kHz
void i2c_master_init(void) {
// no prescaler
TWSR = 0;
// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
// Check datasheets for more info.
TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
}
// Start a transaction with the given i2c slave address. The direction of the
// transfer is set with I2C_READ and I2C_WRITE.
// returns: 0 => success
// 1 => error
uint8_t i2c_master_start(uint8_t address) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
i2c_delay();
// check that we started successfully
if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
return 1;
TWDR = address;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
return 1; // slave did not acknowledge
else
return 0; // success
}
// Finish the i2c transaction.
void i2c_master_stop(void) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
uint16_t lim = 0;
while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
lim++;
}
// Write one byte to the i2c slave.
// returns 0 => slave ACK
// 1 => slave NACK
uint8_t i2c_master_write(uint8_t data) {
TWDR = data;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
// check if the slave acknowledged us
return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
}
// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
// if ack=0 the acknowledge bit is not set.
// returns: byte read from i2c device
uint8_t i2c_master_read(int ack) {
TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
i2c_delay();
return TWDR;
}
void i2c_reset_state(void) {
TWCR = 0;
}
void i2c_slave_init(uint8_t address) {
TWAR = address << 0; // slave i2c address
// TWEN - twi enable
// TWEA - enable address acknowledgement
// TWINT - twi interrupt flag
// TWIE - enable the twi interrupt
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
}
ISR(TWI_vect);
ISR(TWI_vect) {
uint8_t ack = 1;
switch(TW_STATUS) {
case TW_SR_SLA_ACK:
// this device has been addressed as a slave receiver
slave_has_register_set = false;
break;
case TW_SR_DATA_ACK:
// this device has received data as a slave receiver
// The first byte that we receive in this transaction sets the location
// of the read/write location of the slaves memory that it exposes over
// i2c. After that, bytes will be written at slave_buffer_pos, incrementing
// slave_buffer_pos after each write.
if(!slave_has_register_set) {
slave_buffer_pos = TWDR;
// don't acknowledge the master if this memory loctaion is out of bounds
if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
ack = 0;
slave_buffer_pos = 0;
}
slave_has_register_set = true;
} else {
i2c_slave_buffer[slave_buffer_pos] = TWDR;
BUFFER_POS_INC();
}
break;
case TW_ST_SLA_ACK:
case TW_ST_DATA_ACK:
// master has addressed this device as a slave transmitter and is
// requesting data.
TWDR = i2c_slave_buffer[slave_buffer_pos];
BUFFER_POS_INC();
break;
case TW_BUS_ERROR: // something went wrong, reset twi state
TWCR = 0;
default:
break;
}
// Reset everything, so we are ready for the next TWI interrupt
TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
}
#endif

46
keyboards/fc660c/i2c.h
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@ -1,46 +0,0 @@
#pragma once
#include <stdint.h>
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#define I2C_READ 1
#define I2C_WRITE 0
#define I2C_ACK 1
#define I2C_NACK 0
#define SLAVE_BUFFER_SIZE 0x10
// i2c SCL clock frequency
#define SCL_CLOCK 400000L
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
void i2c_master_init(void);
uint8_t i2c_master_start(uint8_t address);
void i2c_master_stop(void);
uint8_t i2c_master_write(uint8_t data);
uint8_t i2c_master_read(int);
void i2c_reset_state(void);
void i2c_slave_init(uint8_t address);
static inline unsigned char i2c_start_read(unsigned char addr) {
return i2c_master_start((addr << 1) | I2C_READ);
}
static inline unsigned char i2c_start_write(unsigned char addr) {
return i2c_master_start((addr << 1) | I2C_WRITE);
}
// from SSD1306 scrips
extern unsigned char i2c_rep_start(unsigned char addr);
extern void i2c_start_wait(unsigned char addr);
extern unsigned char i2c_readAck(void);
extern unsigned char i2c_readNak(void);
extern unsigned char i2c_read(unsigned char ack);
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();

6
keyboards/fc660c/rules.mk
View file

@ -11,7 +11,7 @@ NKRO_ENABLE = yes # Enable N-Key Rollover
# Optimize size but this may cause error "relocation truncated to fit"
#EXTRALDFLAGS = -Wl,--relax
QUANTUM_LIB_SRC += i2c_master.c
CUSTOM_MATRIX = yes
SRC += matrix.c \
actuation_point.c \
i2c.c
SRC += matrix.c ad5258.c

87
keyboards/fc980c/actuation_point.c
View file

@ -1,87 +0,0 @@
/*
Copyright 2017 Balz Guenat
based on work by Jun Wako <wakojun@gmail.com>
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 2 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/>.
*/
#include "actuation_point.h"
#include "i2c.h"
///////////////////////////////////////////////////////////////////////////////
//
// AD5258 I2C digital potentiometer
// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
//
#define AD5258_ADDR 0b0011000
#define AD5258_INST_RDAC 0x00
#define AD5258_INST_EEPROM 0x20
uint8_t read_rdac(void) {
// read RDAC register
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_RDAC);
i2c_start_read(AD5258_ADDR);
uint8_t ret = i2c_master_read(I2C_NACK);
i2c_master_stop();
return ret;
};
uint8_t read_eeprom(void) {
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_EEPROM);
i2c_start_read(AD5258_ADDR);
uint8_t ret = i2c_master_read(I2C_NACK);
i2c_master_stop();
return ret;
};
void write_rdac(uint8_t rdac) {
// write RDAC register:
i2c_start_write(AD5258_ADDR);
i2c_master_write(AD5258_INST_RDAC);
i2c_master_write(rdac & 0x3F);
i2c_master_stop();
};
void actuation_point_up(void) {
// write RDAC register: lower value makes actuation point shallow
uint8_t rdac = read_rdac();
if (rdac == 0)
write_rdac(0);
else
write_rdac(rdac-1);
};
void actuation_point_down(void) {
// write RDAC register: higher value makes actuation point deep
uint8_t rdac = read_rdac();
if (rdac == 63)
write_rdac(63);
else
write_rdac(rdac+1);
};
void adjust_actuation_point(int offset) {
i2c_master_init();
uint8_t rdac = read_eeprom() + offset;
if (rdac > 63) { // protects from under and overflows
if (offset > 0)
write_rdac(63);
else
write_rdac(0);
} else {
write_rdac(rdac);
}
}

52
keyboards/fc980c/ad5258.c Normal file
View file

@ -0,0 +1,52 @@
/*
Copyright 2017 Balz Guenat
based on work by Jun Wako <wakojun@gmail.com>
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 2 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/>.
*/
#include "ad5258.h"
#include "i2c_master.h"
///////////////////////////////////////////////////////////////////////////////
//
// AD5258 I2C digital potentiometer
// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
//
#define AD5258_I2C_ADDRESS 0x18
#define AD5258_INST_RDAC 0x00
#define AD5258_INST_EEPROM 0x20
void ad5258_init(void) {
i2c_init();
}
uint8_t ad5258_read_rdac(void) {
// read RDAC register
uint8_t ret = 0;
i2c_readReg(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &ret, 1, 100);
return ret;
}
uint8_t ad5258_read_eeprom(void) {
uint8_t ret = 0;
i2c_readReg(AD5258_I2C_ADDRESS, AD5258_INST_EEPROM, &ret, 1, 100);
return ret;
}
void ad5258_write_rdac(uint8_t rdac) {
// write RDAC register:
uint8_t data = rdac & 0x3F;
i2c_writeReg(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &data, 1, 100);
}

28
keyboards/fc980c/ad5258.h Normal file
View file

@ -0,0 +1,28 @@
/*
Copyright 2017 Balz Guenat
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 2 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/>.
*/
#pragma once
#include <stdint.h>
void ad5258_init(void);
uint8_t ad5258_read_rdac(void);
uint8_t ad5258_read_eeprom(void);
void ad5258_write_rdac(uint8_t rdac);

2
keyboards/fc980c/config.h
View file

@ -30,8 +30,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
* These options are also useful to firmware size reduction.
*/
#define USE_I2C
/* disable debug print */
//#define NO_DEBUG

44
keyboards/fc980c/fc980c.c
View file

@ -15,16 +15,46 @@ You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "quantum.h"
#include "fc980c.h"
#ifdef ACTUATION_DEPTH_ADJUSTMENT
#include "actuation_point.h"
#endif
void matrix_init_kb(void) {
#ifdef ACTUATION_DEPTH_ADJUSTMENT
adjust_actuation_point(ACTUATION_DEPTH_ADJUSTMENT);
#endif
matrix_init_user();
matrix_init_user();
}
void actuation_point_up(void) {
// write RDAC register: lower value makes actuation point shallow
uint8_t rdac = ad5258_read_rdac();
if (rdac == 0) {
ad5258_write_rdac(0);
} else {
ad5258_write_rdac(rdac - 1);
}
}
void actuation_point_down(void) {
// write RDAC register: higher value makes actuation point deep
uint8_t rdac = ad5258_read_rdac();
if (rdac == 63) {
ad5258_write_rdac(63);
} else {
ad5258_write_rdac(rdac + 1);
}
}
void adjust_actuation_point(int offset) {
ad5258_init();
uint8_t rdac = ad5258_read_eeprom() + offset;
if (rdac > 63) { // protects from under and overflows
if (offset > 0) {
ad5258_write_rdac(63);
} else {
ad5258_write_rdac(0);
}
} else {
ad5258_write_rdac(rdac);
}
}
#endif

8
keyboards/fc660c/actuation_point.h → keyboards/fc980c/fc980c.h
View file

@ -17,13 +17,15 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#pragma once
#include <stdint.h>
#include "quantum.h"
#ifdef ACTUATION_DEPTH_ADJUSTMENT
# include "ad5258.h"
// see keymaps/actuation-point-example to see how these functions can be used.
uint8_t read_rdac(void);
uint8_t read_eeprom(void);
void actuation_point_up(void);
void actuation_point_down(void);
// be careful with this.
void adjust_actuation_point(int offset);
#endif

162
keyboards/fc980c/i2c.c
View file

@ -1,162 +0,0 @@
#include <util/twi.h>
#include <avr/io.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include <stdbool.h>
#include "i2c.h"
#ifdef USE_I2C
// Limits the amount of we wait for any one i2c transaction.
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
// 9 bits, a single transaction will take around 90μs to complete.
//
// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit
// poll loop takes at least 8 clock cycles to execute
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
static volatile uint8_t slave_buffer_pos;
static volatile bool slave_has_register_set = false;
// Wait for an i2c operation to finish
inline static
void i2c_delay(void) {
uint16_t lim = 0;
while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
lim++;
// easier way, but will wait slightly longer
// _delay_us(100);
}
// Setup twi to run at 100kHz
void i2c_master_init(void) {
// no prescaler
TWSR = 0;
// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
// Check datasheets for more info.
TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
}
// Start a transaction with the given i2c slave address. The direction of the
// transfer is set with I2C_READ and I2C_WRITE.
// returns: 0 => success
// 1 => error
uint8_t i2c_master_start(uint8_t address) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
i2c_delay();
// check that we started successfully
if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
return 1;
TWDR = address;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
return 1; // slave did not acknowledge
else
return 0; // success
}
// Finish the i2c transaction.
void i2c_master_stop(void) {
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
uint16_t lim = 0;
while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
lim++;
}
// Write one byte to the i2c slave.
// returns 0 => slave ACK
// 1 => slave NACK
uint8_t i2c_master_write(uint8_t data) {
TWDR = data;
TWCR = (1<<TWINT) | (1<<TWEN);
i2c_delay();
// check if the slave acknowledged us
return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
}
// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
// if ack=0 the acknowledge bit is not set.
// returns: byte read from i2c device
uint8_t i2c_master_read(int ack) {
TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
i2c_delay();
return TWDR;
}
void i2c_reset_state(void) {
TWCR = 0;
}
void i2c_slave_init(uint8_t address) {
TWAR = address << 0; // slave i2c address
// TWEN - twi enable
// TWEA - enable address acknowledgement
// TWINT - twi interrupt flag
// TWIE - enable the twi interrupt
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
}
ISR(TWI_vect);
ISR(TWI_vect) {
uint8_t ack = 1;
switch(TW_STATUS) {
case TW_SR_SLA_ACK:
// this device has been addressed as a slave receiver
slave_has_register_set = false;
break;
case TW_SR_DATA_ACK:
// this device has received data as a slave receiver
// The first byte that we receive in this transaction sets the location
// of the read/write location of the slaves memory that it exposes over
// i2c. After that, bytes will be written at slave_buffer_pos, incrementing
// slave_buffer_pos after each write.
if(!slave_has_register_set) {
slave_buffer_pos = TWDR;
// don't acknowledge the master if this memory loctaion is out of bounds
if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
ack = 0;
slave_buffer_pos = 0;
}
slave_has_register_set = true;
} else {
i2c_slave_buffer[slave_buffer_pos] = TWDR;
BUFFER_POS_INC();
}
break;
case TW_ST_SLA_ACK:
case TW_ST_DATA_ACK:
// master has addressed this device as a slave transmitter and is
// requesting data.
TWDR = i2c_slave_buffer[slave_buffer_pos];
BUFFER_POS_INC();
break;
case TW_BUS_ERROR: // something went wrong, reset twi state
TWCR = 0;
default:
break;
}
// Reset everything, so we are ready for the next TWI interrupt
TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
}
#endif

46
keyboards/fc980c/i2c.h
View file

@ -1,46 +0,0 @@
#pragma once
#include <stdint.h>
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#define I2C_READ 1
#define I2C_WRITE 0
#define I2C_ACK 1
#define I2C_NACK 0
#define SLAVE_BUFFER_SIZE 0x10
// i2c SCL clock frequency
#define SCL_CLOCK 400000L
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
void i2c_master_init(void);
uint8_t i2c_master_start(uint8_t address);
void i2c_master_stop(void);
uint8_t i2c_master_write(uint8_t data);
uint8_t i2c_master_read(int);
void i2c_reset_state(void);
void i2c_slave_init(uint8_t address);
static inline unsigned char i2c_start_read(unsigned char addr) {
return i2c_master_start((addr << 1) | I2C_READ);
}
static inline unsigned char i2c_start_write(unsigned char addr) {
return i2c_master_start((addr << 1) | I2C_WRITE);
}
// from SSD1306 scrips
extern unsigned char i2c_rep_start(unsigned char addr);
extern void i2c_start_wait(unsigned char addr);
extern unsigned char i2c_readAck(void);
extern unsigned char i2c_readNak(void);
extern unsigned char i2c_read(unsigned char ack);
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();

8
keyboards/fc980c/keymaps/actuation-point-example/config.h
View file

@ -14,11 +14,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CONFIG_USER_H
#define CONFIG_USER_H
// place overrides here
#pragma once
// higher value means deeper actuation point, less sensitive
// be careful and only make small adjustments (steps of 1 or 2).
@ -27,5 +23,3 @@
// this should probably stay in the range +/-5.
#undef ACTUATION_DEPTH_ADJUSTMENT
#define ACTUATION_DEPTH_ADJUSTMENT +1
#endif

5
keyboards/fc980c/keymaps/actuation-point-example/keymap.c
View file

@ -15,7 +15,6 @@ You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include QMK_KEYBOARD_H
#include "actuation_point.h"
enum custom_keycodes
{
@ -62,12 +61,12 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record)
}
case AP_READ_RDAC:
{
xprintf("RDAC: %d", read_rdac());
xprintf("RDAC: %d", ad5258_read_rdac());
return false;
}
case AP_READ_EEPROM:
{
xprintf("EEPROM: %d", read_eeprom());
xprintf("EEPROM: %d", ad5258_read_eeprom());
return false;
}

6
keyboards/fc980c/rules.mk
View file

@ -11,7 +11,7 @@ NKRO_ENABLE = yes # Enable N-Key Rollover
# Optimize size but this may cause error "relocation truncated to fit"
#EXTRALDFLAGS = -Wl,--relax
QUANTUM_LIB_SRC += i2c_master.c
CUSTOM_MATRIX = yes
SRC += matrix.c \
actuation_point.c \
i2c.c
SRC += matrix.c ad5258.c