eeb6443767
* add i2c lib submodule * add actuation point adjustment to fc980c * add actuation point adjustment to fc660c also. * use https for i2c submodule * move to existing i2c lib * properly remove old submodule * oops, forgot some files for the fc660c
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/*
|
|
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);
|
|
}
|
|
}
|