Fix Shift595 output offsets and restart relay toggles

CHANGELOG.md

@@ -23,6 +23,7 @@ All notable changes to this project will be documented in this file.
 - Wrong GUI Module and Template drop down list indexes regression
 - Use HTML escape on File System Edit File load (#22492)
 - Magic switch applying masking window to any power change (#22535)
+- Shift595 output offsets and restart relay toggles
 
 ### Removed
 

RELEASENOTES.md

@@ -169,6 +169,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 
 ### Fixed
 - FUNC_COMMAND linked list command buffer corruption by shutter driver
+- Shift595 output offsets and restart relay toggles
 - Use HTML escape on File System Edit File load [#22492](https://github.com/arendst/Tasmota/issues/22492)
 - Prevent crashing when `display.ini` is missing end `#` [#22471](https://github.com/arendst/Tasmota/issues/22471)
 - Magic switch applying masking window to any power change [#22535](https://github.com/arendst/Tasmota/issues/22535)

tasmota/tasmota_support/support.ino

@@ -832,12 +832,28 @@ int32_t UpdateDevicesPresent(int32_t change) {
   else if (devices_present >= POWER_SIZE) {           // Support up to uint32_t as bitmask
     difference = devices_present - POWER_SIZE;
     devices_present = POWER_SIZE;
-    AddLog(LOG_LEVEL_DEBUG, PSTR("APP: Max number of devices reached"));
+//    AddLog(LOG_LEVEL_DEBUG, PSTR("APP: Max 32 devices supported"));
   }
   TasmotaGlobal.devices_present = devices_present;
   return difference;
 }
 
+void DevicesPresentNonDisplayOrLight(uint32_t &devices_claimed) {
+  uint32_t display_and_lights = 0;
+#ifdef USE_LIGHT
+  display_and_lights += LightDevices();               // Skip light(s)
+#endif  // USE_LIGHT
+#ifdef USE_DISPLAY
+  if (disp_device) {
+    display_and_lights++;                             // Skip display
+  }
+#endif  // USE_DISPLAY
+  uint32_t devices_present = TasmotaGlobal.devices_present - display_and_lights;
+  if (devices_claimed > devices_present) {
+    devices_claimed = devices_present;                // Reduce amount of claimed devices
+  }
+}
+
 char* GetPowerDevice(char* dest, uint32_t idx, size_t size, uint32_t option)
 {
   strncpy_P(dest, S_RSLT_POWER, size);                // POWER

tasmota/tasmota_xdrv_driver/xdrv_04_light.ino

@@ -293,6 +293,13 @@ uint8_t LightDevice(void)
   return Light.device;                    // Make external
 }
 
+uint32_t LightDevices(void) {
+  if (0 == Light.device) {
+    return 0;
+  }
+  return TasmotaGlobal.devices_present - Light.device +1;                    // Make external
+}
+
 static uint32_t min3(uint32_t a, uint32_t b, uint32_t c) {
   return (a < b && a < c) ? a : (b < c) ? b : c;
 }

tasmota/tasmota_xdrv_driver/xdrv_28_pcf8574_v2.ino

@@ -374,6 +374,7 @@ void Pcf8574Power(void) {
     rpower >>= Pcf8574.relay_offset;
     relay_max = Pcf8574.relay_max;
   }
+  DevicesPresentNonDisplayOrLight(relay_max);     // Skip display and/or light(s)
   for (uint32_t index = 0; index < relay_max; index++) {
     power_t state = rpower &1;
     if (Pcf8574PinUsed(GPIO_REL1, index)) {

tasmota/tasmota_xdrv_driver/xdrv_60_shift595.ino

@@ -31,15 +31,28 @@ struct Shift595 {
   uint8_t pinOE;
   uint8_t outputs;
   uint8_t first;
-  bool connected = false;
 } *Shift595 = nullptr;
 
+/*********************************************************************************************\
+ * Low level Shift 74x595
+\*********************************************************************************************/
+
 void Shift595ConfigurePin(uint8_t pin, uint8_t value = 0) {
   pinMode(pin, OUTPUT);
   digitalWrite(pin, value);
 }
 
-void Shift595Init(void) {
+void Shift595LatchPin(uint8_t pin) {
+  digitalWrite(pin, 1);
+  digitalWrite(pin, 0);
+}
+
+/*********************************************************************************************\
+ * FUNC_SETUP_RING2 at T +1
+ * Claim devices_present
+\*********************************************************************************************/
+
+void Shift595ModuleInit(void) {
   if (PinUsed(GPIO_SHIFT595_SRCLK) && PinUsed(GPIO_SHIFT595_RCLK) && PinUsed(GPIO_SHIFT595_SER)) {
     Shift595 = (struct Shift595*)calloc(1, sizeof(struct Shift595));
     if (Shift595) {
@@ -53,40 +66,60 @@ void Shift595Init(void) {
 
       if (PinUsed(GPIO_SHIFT595_OE)) {
         Shift595->pinOE = Pin(GPIO_SHIFT595_OE);
-        Shift595ConfigurePin(Shift595->pinOE, 1);
+        if (ResetReasonPowerOn()) {                    // Fix relay toggle at restart
+          Shift595ConfigurePin(Shift595->pinOE, 1);    // Set all outputs to 3-state (3-state converted to OFF by ULN2803 relay drivers)
+        }
       }
 
-      Shift595->first = TasmotaGlobal.devices_present;
+      Shift595->first = TasmotaGlobal.devices_present; // devices_present offset
-      Shift595->outputs = Settings->shift595_device_count * 8;
+      Shift595->outputs = Settings->shift595_device_count * 8;  // Max number of outputs present
       UpdateDevicesPresent(Shift595->outputs);
-
-      Shift595->connected = true;
-      AddLog(LOG_LEVEL_DEBUG, PSTR("595: Controlling relays POWER%d to POWER%d"), Shift595->first + 1, Shift595->first + Shift595->outputs);
     }
   }
 }
 
-void Shift595LatchPin(uint8_t pin) {
+/*********************************************************************************************\
-  digitalWrite(pin, 1);
+ * FUNC_SET_POWER at T +2
-  digitalWrite(pin, 0);
+ * Reduce devices_present with display and/or lights not known before
-}
+ * Add offset for previous defined relays
+\*********************************************************************************************/
 
 void Shift595SwitchRelay(void) {
-  if (Shift595 && Shift595->connected == true) {
+  // XdrvMailbox.index = 32-bit rpower bit mask
-    for (uint32_t i = 0; i < Shift595->outputs; i++) {
+  // Use relative and sequential relay indexes
-      uint8_t relay_state = bitRead(XdrvMailbox.index, Shift595->first + Shift595->outputs -1 -i);
+  power_t rpower = XdrvMailbox.index;
-      digitalWrite(Shift595->pinSER, Settings->flag5.shift595_invert_outputs ? !relay_state : relay_state);
+  uint32_t relay_max = Shift595->outputs;              // Total number of outputs
-      Shift595LatchPin(Shift595->pinSRCLK);
+  DevicesPresentNonDisplayOrLight(relay_max);          // Skip display and/or light(s)
-    }
+  uint32_t relay_offset = Shift595->outputs - relay_max + Shift595->first;
 
-    Shift595LatchPin(Shift595->pinRCLK);
+  static bool first = false;
+  if (!first) {
+    AddLog(LOG_LEVEL_DEBUG, PSTR("595: Output 1 to %d use POWER%d to POWER%d"), Shift595->outputs - relay_offset, Shift595->first + 1, relay_max);
+    first = true;
+  }
 
-    if (PinUsed(GPIO_SHIFT595_OE)) {
+  uint32_t power_bit = relay_max -1;                   // Start at highest non display and/or light power bit
-        digitalWrite(Shift595->pinOE, 0);
+  for (uint32_t i = 0; i < Shift595->outputs; i++) {   // We need to set all shift outputs even if not used
+    uint32_t relay_state = 0;                          // Unused state
+    if (i >= relay_offset) {
+      relay_state = bitRead(rpower, power_bit);        // Shift-in from high to low
+      power_bit--;
     }
+    digitalWrite(Shift595->pinSER, Settings->flag5.shift595_invert_outputs ? !relay_state : relay_state);  // SetOption133 - (Shift595) Invert outputs of 74x595 shift registers
+    Shift595LatchPin(Shift595->pinSRCLK);
+  }
+
+  Shift595LatchPin(Shift595->pinRCLK);
+
+  if (PinUsed(GPIO_SHIFT595_OE)) {
+    digitalWrite(Shift595->pinOE, 0);
   }
 }
 
+/*********************************************************************************************\
+ * Commands
+\*********************************************************************************************/
+
 void CmndShift595Devices(void) {
   if ((XdrvMailbox.payload > 0) && (XdrvMailbox.payload * 8 <= MAX_RELAYS_SET - Shift595->first)) {
     Settings->shift595_device_count = (1 == XdrvMailbox.payload) ? SHIFT595_DEVICE_COUNT : XdrvMailbox.payload;
@@ -102,8 +135,8 @@ void CmndShift595Devices(void) {
 bool Xdrv60(uint32_t function) {
   bool result = false;
 
-  if (FUNC_PRE_INIT == function) {
+  if (FUNC_SETUP_RING2 == function) {
-    Shift595Init();
+    Shift595ModuleInit();
   } else if (Shift595) {
     switch (function) {
       case FUNC_SET_POWER:

tasmota/tasmota_xdrv_driver/xdrv_67_mcp23xxx.ino

@@ -762,6 +762,7 @@ void MCP23xPower(void) {
     rpower >>= Mcp23x.relay_offset;
     relay_max = Mcp23x.relay_max;
   }
+  DevicesPresentNonDisplayOrLight(relay_max);          // Skip display and/or light(s)
   for (uint32_t index = 0; index < relay_max; index++) {
     power_t state = rpower &1;
     if (MCP23xPinUsed(GPIO_REL1, index)) {