Tasmota/tasmota/xdrv_28_pcf8574.ino

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/*
xdrv_28_pcf8574.ino - PCF8574 I2C support for Tasmota
2021-01-01 12:44:04 +00:00
Copyright (C) 2021 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 <http://www.gnu.org/licenses/>.
*/
#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 };
#ifdef USE_PCF8574_MQTTINPUT
uint8_t last_input[MAX_PCF8574] = { 0 };
#endif
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];
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bool type = false;
} Pcf8574;
uint8_t Pcf8574Read(uint8_t idx)
{
Wire.requestFrom(Pcf8574.address[idx],(uint8_t)1);
return Wire.read();
}
uint8_t Pcf8574Write(uint8_t idx)
{
Wire.beginTransmission(Pcf8574.address[idx]);
Wire.write(Pcf8574.pin_mask[idx]);
return Wire.endTransmission();
}
void Pcf8574SwitchRelay(void)
{
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for (uint32_t i = 0; i < TasmotaGlobal.devices_present; i++) {
uint8_t relay_state = bitRead(XdrvMailbox.index, i);
if (Pcf8574.max_devices > 0 && Pcf8574.pin[i] < 99) {
uint8_t board = Pcf8574.pin[i]>>3;
uint8_t pin = Pcf8574.pin[i]&0x7;
uint8_t oldpinmask = Pcf8574.pin_mask[board];
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uint8_t _val = bitRead(TasmotaGlobal.rel_inverted, i) ? !relay_state : relay_state;
//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: SwitchRelay %d=%d => PCF-%d.D%d=%d"), i, relay_state, board +1, pin, _val);
bitWrite(Pcf8574.pin_mask[board], pin, _val);
if (oldpinmask != Pcf8574.pin_mask[board]) {
Pcf8574.error = Pcf8574Write(board);
}
//else AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: SwitchRelay skipped"));
}
}
}
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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) {
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AddLog(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
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// AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: Probing addr: 0x%x for PCF8574"), pcf8574_address);
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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");
}
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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;
}
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TasmotaGlobal.devices_present = TasmotaGlobal.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
uint8_t gpio = Pcf8574Read(idx);
Pcf8574.pin_mask[idx] = gpio;
#ifdef USE_PCF8574_MQTTINPUT
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Pcf8574.last_input[idx] = gpio & ~Settings->pcf8574_config[idx];
#endif // #ifdef USE_PCF8574_MQTTINPUT
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//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: PCF-%d config=0x%02x, gpio=0x%02X"), idx +1, Settings->pcf8574_config[idx], gpio);
for (uint32_t i = 0; i < 8; i++, gpio>>=1) {
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uint8_t _result = Settings->pcf8574_config[idx] >> i &1;
//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: I2C shift i %d: %d. Powerstate: %d, TasmotaGlobal.devices_present: %d"), i,_result, Settings->power>>i&1, TasmotaGlobal.devices_present);
if (_result > 0) {
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Pcf8574.pin[TasmotaGlobal.devices_present] = i + 8 * idx;
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bitWrite(TasmotaGlobal.rel_inverted, TasmotaGlobal.devices_present, Settings->flag3.pcf8574_ports_inverted); // SetOption81 - Invert all ports on PCF8574 devices
if (!Settings->flag.save_state && !Settings->flag3.no_power_feedback) { // SetOption63 - Don't scan relay power state at restart - #5594 and #5663
//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: Set power from from chip state"));
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uint8_t power_state = Settings->flag3.pcf8574_ports_inverted ? 1 & ~gpio : 1 & gpio;
bitWrite(TasmotaGlobal.power, TasmotaGlobal.devices_present, power_state);
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bitWrite(Settings->power, TasmotaGlobal.devices_present, power_state);
}
//else AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: DON'T set power from chip state"));
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TasmotaGlobal.devices_present++;
Pcf8574.max_connected_ports++;
}
}
}
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//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: Settings->power=0x%08X, TasmotaGlobal.power=0x%08X"), Settings->power, TasmotaGlobal.power);
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AddLog(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 =
"<p><form action='" WEB_HANDLE_PCF8574 "' method='get'><button>" D_CONFIGURE_PCF8574 "</button></form></p>";
const char HTTP_FORM_I2C_PCF8574_1[] PROGMEM =
"<fieldset><legend><b>&nbsp;" D_PCF8574_PARAMETERS "&nbsp;</b></legend>"
"<form method='get' action='" WEB_HANDLE_PCF8574 "'>"
"<p><label><input id='b1' name='b1' type='checkbox'%s><b>" D_INVERT_PORTS "</b></label></p><hr/>";
const char HTTP_FORM_I2C_PCF8574_2[] PROGMEM =
"<tr><td><b>" D_DEVICE " %d " D_PORT " %d</b></td><td style='width:100px'><select id='i2cs%d' name='i2cs%d'>"
"<option%s value='0'>" D_DEVICE_INPUT "</option>"
"<option%s value='1'>" D_DEVICE_OUTPUT "</option>"
"</select></td></tr>";
const char HTTP_SNS_PCF8574_GPIO[] PROGMEM = "{s}PCF8574%c%d D%d{m}%d{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
void HandlePcf8574(void)
{
if (!HttpCheckPriviledgedAccess()) { return; }
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AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_HTTP D_CONFIGURE_PCF8574));
if (Webserver->hasArg("save")) {
Pcf8574SaveSettings();
WebRestart(1);
return;
}
WSContentStart_P(D_CONFIGURE_PCF8574);
WSContentSendStyle();
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WSContentSend_P(HTTP_FORM_I2C_PCF8574_1, (Settings->flag3.pcf8574_ports_inverted) ? PSTR(" 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,
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((helper & Settings->pcf8574_config[idx]) >> idx2 == 0) ? PSTR(" selected ") : " ",
((helper & Settings->pcf8574_config[idx]) >> idx2 == 1) ? PSTR(" selected ") : " "
);
}
}
WSContentSend_P(PSTR("</table>"));
WSContentSend_P(HTTP_FORM_END);
WSContentSpaceButton(BUTTON_CONFIGURATION);
WSContentStop();
}
#if defined(USE_PCF8574_SENSOR) || defined(USE_PCF8574_DISPLAYINPUT)
void Pcf8574Show(bool json)
{
#ifdef USE_PCF8574_SENSOR
if (json) {
for (int idx = 0 ; idx < Pcf8574.max_devices ; idx++)
{
uint8_t gpio = Pcf8574Read(idx);
ResponseAppend_P(PSTR(",\"PCF8574%c%d\":{\"D0\":%i,\"D1\":%i,\"D2\":%i,\"D3\":%i,\"D4\":%i,\"D5\":%i,\"D6\":%i,\"D7\":%i}"),
IndexSeparator(), idx +1,
(gpio>>0)&1,(gpio>>1)&1,(gpio>>2)&1,(gpio>>3)&1,(gpio>>4)&1,(gpio>>5)&1,(gpio>>6)&1,(gpio>>7)&1);
}
ResponseJsonEnd();
}
#endif // #ifdef USE_PCF8574_SENSOR
#if defined(USE_WEBSERVER) && defined(USE_PCF8574_DISPLAYINPUT)
if(!json) {
for (int idx = 0 ; idx < Pcf8574.max_devices ; idx++)
{
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uint8_t input_mask = ~Settings->pcf8574_config[idx]; //invert to 1 = input
uint8_t gpio = Pcf8574Read(idx);
for (int pin = 0 ; pin < 8 ; ++pin, input_mask>>=1, gpio>>=1)
{
if (input_mask & 1)
WSContentSend_P(HTTP_SNS_PCF8574_GPIO, IndexSeparator(), idx +1, pin, gpio & 1);
}
}
}
#endif // defined(USE_WEBSERVER) && defined(USE_PCF8574_DISPLAYINPUT)
}
#endif // #if defined(USE_PCF8574_SENSOR) || defined(USE_PCF8574_DISPLAYINPUT)
#ifdef USE_PCF8574_MQTTINPUT
void Pcf8574CheckForInputChange(void)
{
for (int idx = 0 ; idx < Pcf8574.max_devices ; idx++)
{
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uint8_t input_mask = ~Settings->pcf8574_config[idx]; //invert to 1 = input
uint8_t input = Pcf8574Read(idx) & input_mask;
uint8_t last_input = Pcf8574.last_input[idx];
if (input != last_input) { // don't scan bits if no change (EVERY_50_MS !)
for (uint8_t pin = 0 ; pin < 8 ; ++pin) {
if (bitRead(input_mask,pin) && bitRead(input,pin) != bitRead(last_input,pin)) {
ResponseTime_P(PSTR(",\"PCF8574%c%d_INP\":{\"D%i\":%i}}"), IndexSeparator(), idx +1, pin, bitRead(input,pin));
MqttPublishPrefixTopicRulesProcess_P(RESULT_OR_STAT, PSTR("PCF8574_INP"));
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if (Settings->flag3.hass_tele_on_power) { // SetOption59 - Send tele/%topic%/SENSOR in addition to stat/%topic%/RESULT
MqttPublishSensor();
}
}
Pcf8574.last_input[idx] = input;
}
}
}
}
#endif //#ifdef USE_PCF8574_MQTTINPUT
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void Pcf8574SaveSettings(void)
{
char stemp[7];
char tmp[100];
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//AddLog(LOG_LEVEL_DEBUG, PSTR("PCF: Start working on Save arguements: inverted:%d")), Webserver->hasArg("b1");
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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;
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byte n = Settings->pcf8574_config[idx];
while(n!=0) {
n = n&(n-1);
count++;
}
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if (count <= TasmotaGlobal.devices_present) {
TasmotaGlobal.devices_present = TasmotaGlobal.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) {
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Settings->pcf8574_config[idx] = Settings->pcf8574_config[idx] | 1 << i;
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TasmotaGlobal.devices_present++;
Pcf8574.max_connected_ports++;
} else {
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Settings->pcf8574_config[idx] = Settings->pcf8574_config[idx] & ~(1 << i );
}
}
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//Settings->pcf8574_config[0] = (!strlen(webServer->arg("i2cs0").c_str())) ? 0 : atoi(webServer->arg("i2cs0").c_str());
//AddLog(LOG_LEVEL_INFO, PSTR("PCF: I2C Board: %d, Config: %2x")), idx, Settings->pcf8574_config[idx];
}
}
#endif // USE_WEBSERVER
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xdrv28(uint8_t function)
{
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if (!I2cEnabled(XI2C_02)) { return false; }
bool result = false;
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if (FUNC_PRE_INIT == function) {
Pcf8574Init();
}
else if (Pcf8574.type) {
switch (function) {
case FUNC_SET_POWER:
Pcf8574SwitchRelay();
break;
#ifdef USE_PCF8574_MQTTINPUT
case FUNC_EVERY_50_MSECOND:
Pcf8574CheckForInputChange();
break;
#endif // #ifdef USE_PCF8574_MQTTINPUT
#ifdef USE_PCF8574_SENSOR
case FUNC_JSON_APPEND:
Pcf8574Show(1);
break;
#endif // #ifdef USE_PCF8574_SENSOR
#ifdef USE_WEBSERVER
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case FUNC_WEB_ADD_BUTTON:
WSContentSend_P(HTTP_BTN_MENU_PCF8574);
break;
case FUNC_WEB_ADD_HANDLER:
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WebServer_on(PSTR("/" WEB_HANDLE_PCF8574), HandlePcf8574);
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break;
#ifdef USE_PCF8574_DISPLAYINPUT
case FUNC_WEB_SENSOR:
Pcf8574Show(0);
break;
#endif // #ifdef USE_PCF8574_DISPLAYINPUT
#endif // USE_WEBSERVER
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}
}
return result;
}
#endif // USE_PCF8574
#endif // USE_I2C