1 files changed, 52 insertions, 0 deletions
diff --git a/keyboards/fc980c/ad5258.c b/keyboards/fc980c/ad5258.c
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+++ b/keyboards/fc980c/ad5258.c
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+/*
+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);
+}