kopia lustrzana https://github.com/OpenRTX/OpenRTX
56 wiersze
2.3 KiB
C
56 wiersze
2.3 KiB
C
/***************************************************************************
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* Copyright (C) 2021 - 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* Mathis Schmieder DB9MAT *
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* *
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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 3 of the License, or *
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* (at your option) any later version. *
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* *
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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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* *
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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 "MCP4551.h"
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// Common WIPER values
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#define MCP4551_WIPER_MID 0x080
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#define MCP4551_WIPER_A 0x100
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#define MCP4551_WIPER_B 0x000
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// Command definitions (sent to WIPER register)
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#define MCP4551_CMD_WRITE 0x00
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#define MCP4551_CMD_INC 0x04
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#define MCP4551_CMD_DEC 0x08
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#define MCP4551_CMD_READ 0x0C
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int mcp4551_init(const struct i2cDevice *i2c, const uint8_t devAddr)
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{
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return mcp4551_setWiper(i2c, devAddr, MCP4551_WIPER_MID);
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}
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int mcp4551_setWiper(const struct i2cDevice *i2c, const uint8_t devAddr,
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const uint16_t value)
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{
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uint8_t data[2] =
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{
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(uint8_t)(value >> 8 & 0x01) | MCP4551_CMD_WRITE,
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(uint8_t) value
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};
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i2c_acquire(i2c);
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int ret = i2c_write(i2c, devAddr, data, 2, true);
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i2c_release(i2c);
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return ret;
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}
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