/* xdrv_28_pcf8574.ino - PCF8574 I2C support for Tasmota Copyright (C) 2020 Stefan Bode 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 3 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 . */ #ifdef USE_I2C #ifdef USE_PCF8574 /*********************************************************************************************\ * PCF8574 - I2C IO Expander * * I2C Address: PCF8574 = 0x20 .. 0x27 (0x27 is not supported), * PCF8574A = 0x39 .. 0x3F (0x38 is not supported) \*********************************************************************************************/ #define XDRV_28 28 #define XI2C_02 2 // See I2CDEVICES.md #define PCF8574_ADDR1 0x20 // PCF8574 #define PCF8574_ADDR2 0x38 // PCF8574A struct PCF8574 { int error; uint8_t pin[64]; uint8_t address[MAX_PCF8574]; uint8_t pin_mask[MAX_PCF8574] = { 0 }; uint8_t max_connected_ports = 0; // Max numbers of devices comming from PCF8574 modules uint8_t max_devices = 0; // Max numbers of PCF8574 modules char stype[9]; bool type = false; } Pcf8574; void Pcf8574SwitchRelay(void) { for (uint32_t i = 0; i < devices_present; i++) { uint8_t relay_state = bitRead(XdrvMailbox.index, i); //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("PCF: Pcf8574.max_devices %d requested pin %d"), Pcf8574.max_devices,Pcf8574.pin[i]); if (Pcf8574.max_devices > 0 && Pcf8574.pin[i] < 99) { uint8_t board = Pcf8574.pin[i]>>3; uint8_t oldpinmask = Pcf8574.pin_mask[board]; uint8_t _val = bitRead(rel_inverted, i) ? !relay_state : relay_state; //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("PCF: Pcf8574SwitchRelay %d on pin %d"), i,state); if (_val) { Pcf8574.pin_mask[board] |= _val << (Pcf8574.pin[i]&0x7); } else { Pcf8574.pin_mask[board] &= ~(1 << (Pcf8574.pin[i]&0x7)); } if (oldpinmask != Pcf8574.pin_mask[board]) { Wire.beginTransmission(Pcf8574.address[board]); Wire.write(Pcf8574.pin_mask[board]); Pcf8574.error = Wire.endTransmission(); } //pcf8574.write(Pcf8574.pin[i]&0x7, rel_inverted[i] ? !state : state); } } } void Pcf8574Init(void) { uint8_t pcf8574_address = PCF8574_ADDR1; while ((Pcf8574.max_devices < MAX_PCF8574) && (pcf8574_address < PCF8574_ADDR2 +8)) { #ifdef USE_MCP230xx_ADDR if (USE_MCP230xx_ADDR == pcf8574_address) { AddLog_P2(LOG_LEVEL_INFO, PSTR("PCF: Address 0x%02x reserved for MCP320xx skipped"), pcf8574_address); pcf8574_address++; if ((PCF8574_ADDR1 +7) == pcf8574_address) { // Support I2C addresses 0x20 to 0x26 and 0x39 to 0x3F pcf8574_address = PCF8574_ADDR2 +1; } } #endif // AddLog_P2(LOG_LEVEL_DEBUG, PSTR("PCF: Probing addr: 0x%x for PCF8574"), pcf8574_address); if (I2cSetDevice(pcf8574_address)) { Pcf8574.type = true; Pcf8574.address[Pcf8574.max_devices] = pcf8574_address; Pcf8574.max_devices++; strcpy(Pcf8574.stype, "PCF8574"); if (pcf8574_address >= PCF8574_ADDR2) { strcpy(Pcf8574.stype, "PCF8574A"); } I2cSetActiveFound(pcf8574_address, Pcf8574.stype); } pcf8574_address++; if ((PCF8574_ADDR1 +7) == pcf8574_address) { // Support I2C addresses 0x20 to 0x26 and 0x39 to 0x3F pcf8574_address = PCF8574_ADDR2 +1; } } if (Pcf8574.type) { for (uint32_t i = 0; i < sizeof(Pcf8574.pin); i++) { Pcf8574.pin[i] = 99; } devices_present = devices_present - Pcf8574.max_connected_ports; // reset no of devices to avoid duplicate ports on duplicate init. Pcf8574.max_connected_ports = 0; // reset no of devices to avoid duplicate ports on duplicate init. for (uint32_t idx = 0; idx < Pcf8574.max_devices; idx++) { // suport up to 8 boards PCF8574 AddLog_P2(LOG_LEVEL_DEBUG, PSTR("PCF: Device %d config 0x%02x"), idx +1, Settings.pcf8574_config[idx]); for (uint32_t i = 0; i < 8; i++) { uint8_t _result = Settings.pcf8574_config[idx] >> i &1; //AddLog_P2(LOG_LEVEL_DEBUG, PSTR("PCF: I2C shift i %d: %d. Powerstate: %d, devices_present: %d"), i,_result, Settings.power>>i&1, devices_present); if (_result > 0) { Pcf8574.pin[devices_present] = i + 8 * idx; bitWrite(rel_inverted, devices_present, Settings.flag3.pcf8574_ports_inverted); // SetOption81 - Invert all ports on PCF8574 devices devices_present++; Pcf8574.max_connected_ports++; } } } AddLog_P2(LOG_LEVEL_INFO, PSTR("PCF: Total devices %d, PCF8574 output ports %d"), Pcf8574.max_devices, Pcf8574.max_connected_ports); } } /*********************************************************************************************\ * Presentation \*********************************************************************************************/ #ifdef USE_WEBSERVER #define WEB_HANDLE_PCF8574 "pcf" const char HTTP_BTN_MENU_PCF8574[] PROGMEM = "

"; const char HTTP_FORM_I2C_PCF8574_1[] PROGMEM = "
 " D_PCF8574_PARAMETERS " " "
" "


"; const char HTTP_FORM_I2C_PCF8574_2[] PROGMEM = "" D_DEVICE " %d " D_PORT " %d"; void HandlePcf8574(void) { if (!HttpCheckPriviledgedAccess()) { return; } AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_HTTP D_CONFIGURE_PCF8574)); if (Webserver->hasArg("save")) { Pcf8574SaveSettings(); WebRestart(1); return; } WSContentStart_P(D_CONFIGURE_PCF8574); WSContentSendStyle(); WSContentSend_P(HTTP_FORM_I2C_PCF8574_1, (Settings.flag3.pcf8574_ports_inverted) ? " checked" : ""); // SetOption81 - Invert all ports on PCF8574 devices WSContentSend_P(HTTP_TABLE100); for (uint32_t idx = 0; idx < Pcf8574.max_devices; idx++) { for (uint32_t idx2 = 0; idx2 < 8; idx2++) { // 8 ports on PCF8574 uint8_t helper = 1 << idx2; WSContentSend_P(HTTP_FORM_I2C_PCF8574_2, idx +1, idx2, idx2 + 8*idx, idx2 + 8*idx, ((helper & Settings.pcf8574_config[idx]) >> idx2 == 0) ? " selected " : " ", ((helper & Settings.pcf8574_config[idx]) >> idx2 == 1) ? " selected " : " " ); } } WSContentSend_P(PSTR("")); WSContentSend_P(HTTP_FORM_END); WSContentSpaceButton(BUTTON_CONFIGURATION); WSContentStop(); } void Pcf8574SaveSettings(void) { char stemp[7]; char tmp[100]; //AddLog_P(LOG_LEVEL_DEBUG, PSTR("PCF: Start working on Save arguements: inverted:%d")), Webserver->hasArg("b1"); Settings.flag3.pcf8574_ports_inverted = Webserver->hasArg("b1"); // SetOption81 - Invert all ports on PCF8574 devices for (byte idx = 0; idx < Pcf8574.max_devices; idx++) { byte count=0; byte n = Settings.pcf8574_config[idx]; while(n!=0) { n = n&(n-1); count++; } if (count <= devices_present) { devices_present = devices_present - count; } for (byte i = 0; i < 8; i++) { snprintf_P(stemp, sizeof(stemp), PSTR("i2cs%d"), i+8*idx); WebGetArg(stemp, tmp, sizeof(tmp)); byte _value = (!strlen(tmp)) ? 0 : atoi(tmp); if (_value) { Settings.pcf8574_config[idx] = Settings.pcf8574_config[idx] | 1 << i; devices_present++; Pcf8574.max_connected_ports++; } else { Settings.pcf8574_config[idx] = Settings.pcf8574_config[idx] & ~(1 << i ); } } //Settings.pcf8574_config[0] = (!strlen(webServer->arg("i2cs0").c_str())) ? 0 : atoi(webServer->arg("i2cs0").c_str()); //AddLog_P2(LOG_LEVEL_INFO, PSTR("PCF: I2C Board: %d, Config: %2x")), idx, Settings.pcf8574_config[idx]; } } #endif // USE_WEBSERVER /*********************************************************************************************\ * Interface \*********************************************************************************************/ bool Xdrv28(uint8_t function) { if (!I2cEnabled(XI2C_02)) { return false; } bool result = false; if (FUNC_PRE_INIT == function) { Pcf8574Init(); } else if (Pcf8574.type) { switch (function) { case FUNC_SET_POWER: Pcf8574SwitchRelay(); break; #ifdef USE_WEBSERVER case FUNC_WEB_ADD_BUTTON: WSContentSend_P(HTTP_BTN_MENU_PCF8574); break; case FUNC_WEB_ADD_HANDLER: Webserver->on("/" WEB_HANDLE_PCF8574, HandlePcf8574); break; #endif // USE_WEBSERVER } } return result; } #endif // USE_PCF8574 #endif // USE_I2C