mirror of https://github.com/arendst/Tasmota.git
98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
/*
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xdrv_61_ds3502.ino - DS3502 digital potentiometer support for Tasmota
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SPDX-FileCopyrightText: 2022 Theo Arends and f-reiling
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SPDX-License-Identifier: GPL-3.0-only
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*/
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#ifdef USE_I2C
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#ifdef USE_DS3502
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/*********************************************************************************************\
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* DS3502 - digital potentiometer (https://datasheets.maximintegrated.com/en/ds/DS3502.pdf)
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*
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* I2C Address: 0x28 .. 0x2B
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\*********************************************************************************************/
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#define XDRV_61 61
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#define XI2C_67 67 // See I2CDEVICES.md
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#define USE_DS3502_ADDR 0x28
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#define DS3502_REG_MODE 0x02
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#define DS3502_REG_WIPER 0x00
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struct DS3502 {
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uint8_t address[MAX_DS3502];
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uint8_t max_devices;
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} Ds3502;
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void Ds3502SetWiper(uint32_t idx) {
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I2cWrite8(Ds3502.address[idx], DS3502_REG_WIPER, Settings->ds3502_state[idx] & 0x7F);
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}
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void Ds3502Detect(void) {
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Ds3502.max_devices = 0;
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uint8_t ds3502_address = USE_DS3502_ADDR;
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while (ds3502_address < USE_DS3502_ADDR + MAX_DS3502) {
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if (I2cSetDevice(ds3502_address)) {
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I2cSetActiveFound(ds3502_address, "DS3502");
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Ds3502.address[Ds3502.max_devices] = ds3502_address;
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Ds3502.max_devices++;
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}
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ds3502_address++;
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}
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for (uint32_t idx = 0; idx < Ds3502.max_devices; idx++) {
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I2cWrite8(Ds3502.address[idx], DS3502_REG_MODE, 0x80); // Mode 1 - Write to non-volatile storage only
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Ds3502SetWiper(idx); // Restore state
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}
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}
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/*********************************************************************************************\
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* Commands
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\*********************************************************************************************/
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const char kDS3502Commands[] PROGMEM = "|" // No Prefix
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"Wiper" ;
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void (* const DS3502Command[])(void) PROGMEM = {
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&CmndWiper };
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void CmndWiper(void) {
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// Wiper<x> 0..127
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if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= Ds3502.max_devices)) {
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if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 127)) {
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Settings->ds3502_state[XdrvMailbox.index -1] = XdrvMailbox.payload;
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Ds3502SetWiper(XdrvMailbox.index -1); // Set wiper
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}
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ResponseCmndIdxNumber(Settings->ds3502_state[XdrvMailbox.index -1]);
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xdrv61(uint32_t function) {
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if (!I2cEnabled(XI2C_67)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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Ds3502Detect();
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}
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else if (Ds3502.max_devices) {
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switch (function) {
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case FUNC_COMMAND:
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result = DecodeCommand(kDS3502Commands, DS3502Command);
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break;
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case FUNC_ACTIVE:
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result = true;
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break;
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}
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}
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return result;
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}
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#endif // USE_DS3502
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#endif // USE_IC2
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