Tasmota/tasmota/xdrv_61_ds3502.ino

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