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52 lines
1.5 KiB
52 lines
1.5 KiB
/*
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Copyright 2017 Balz Guenat
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based on work by Jun Wako <wakojun@gmail.com>
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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 2 of the License, or
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(at your option) any later version.
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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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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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#include "ad5258.h"
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#include "i2c_master.h"
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///////////////////////////////////////////////////////////////////////////////
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//
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// AD5258 I2C digital potentiometer
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// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
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//
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#define AD5258_I2C_ADDRESS 0x30
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#define AD5258_INST_RDAC 0x00
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#define AD5258_INST_EEPROM 0x20
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void ad5258_init(void) {
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i2c_init();
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}
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uint8_t ad5258_read_rdac(void) {
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// read RDAC register
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uint8_t ret = 0;
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i2c_read_register(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &ret, 1, 100);
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return ret;
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}
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uint8_t ad5258_read_eeprom(void) {
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uint8_t ret = 0;
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i2c_read_register(AD5258_I2C_ADDRESS, AD5258_INST_EEPROM, &ret, 1, 100);
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return ret;
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}
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void ad5258_write_rdac(uint8_t rdac) {
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// write RDAC register:
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uint8_t data = rdac & 0x3F;
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i2c_write_register(AD5258_I2C_ADDRESS, AD5258_INST_RDAC, &data, 1, 100);
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}
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