diff --git a/lib/OneWire/OneWire.cpp b/lib/OneWire/OneWire.cpp
index 8d4b66c..2416697 100644
--- a/lib/OneWire/OneWire.cpp
+++ b/lib/OneWire/OneWire.cpp
@@ -195,11 +195,7 @@ uint8_t OneWire::reset(void)
 // Write a bit. Port and bit is used to cut lookup time and provide
 // more certain timing.
 //
-#if defined(ARDUINO_ARCH_ESP32)
-void IRAM_ATTR OneWire::write_bit(uint8_t v)
-#else
 void OneWire::write_bit(uint8_t v)
-#endif
 {
 	IO_REG_TYPE mask IO_REG_MASK_ATTR = bitmask;
 	volatile IO_REG_TYPE *reg IO_REG_BASE_ATTR = baseReg;
@@ -227,11 +223,7 @@ void OneWire::write_bit(uint8_t v)
 // Read a bit. Port and bit is used to cut lookup time and provide
 // more certain timing.
 //
-#if defined(ARDUINO_ARCH_ESP32)
-uint8_t IRAM_ATTR OneWire::read_bit(void)
-#else
 uint8_t OneWire::read_bit(void)
-#endif
 {
 	IO_REG_TYPE mask IO_REG_MASK_ATTR = bitmask;
 	volatile IO_REG_TYPE *reg IO_REG_BASE_ATTR = baseReg;
@@ -585,4 +577,4 @@ uint16_t OneWire::crc16(const uint8_t* input, uint16_t len, uint16_t crc)
 }
 #endif
 
-#endif
+#endif
\ No newline at end of file
diff --git a/lib/OneWire/OneWire.h b/lib/OneWire/OneWire.h
index a8126f7..9c5a4ac 100644
--- a/lib/OneWire/OneWire.h
+++ b/lib/OneWire/OneWire.h
@@ -99,18 +99,10 @@ class OneWire
 
     // Write a bit. The bus is always left powered at the end, see
     // note in write() about that.
-    #if defined (ARDUINO_ARCH_ESP32)
-    void IRAM_ATTR write_bit(uint8_t v);
-    #else
     void write_bit(uint8_t v);
-    #endif
 
     // Read a bit.
-    #if defined (ARDUINO_ARCH_ESP32)
-    uint8_t IRAM_ATTR read_bit(void);
-    #else
     uint8_t read_bit(void);
-    #endif
 
     // Stop forcing power onto the bus. You only need to do this if
     // you used the 'power' flag to write() or used a write_bit() call
@@ -187,4 +179,4 @@ class OneWire
 #endif
 
 #endif // __cplusplus
-#endif // OneWire_h
+#endif // OneWire_h
\ No newline at end of file
diff --git a/lib/OneWire/util/OneWire_direct_gpio.h b/lib/OneWire/util/OneWire_direct_gpio.h
index 8df13c8..32e7553 100644
--- a/lib/OneWire/util/OneWire_direct_gpio.h
+++ b/lib/OneWire/util/OneWire_direct_gpio.h
@@ -127,10 +127,14 @@
 static inline __attribute__((always_inline))
 IO_REG_TYPE directRead(IO_REG_TYPE pin)
 {
+#if CONFIG_IDF_TARGET_ESP32C3
+    return (GPIO.in.val >> pin) & 0x1;
+#else // plain ESP32
     if ( pin < 32 )
         return (GPIO.in >> pin) & 0x1;
-    else if ( pin < 40 )
+    else if ( pin < 46 )
         return (GPIO.in1.val >> (pin - 32)) & 0x1;
+#endif
 
     return 0;
 }
@@ -138,38 +142,38 @@ IO_REG_TYPE directRead(IO_REG_TYPE pin)
 static inline __attribute__((always_inline))
 void directWriteLow(IO_REG_TYPE pin)
 {
+#if CONFIG_IDF_TARGET_ESP32C3
+    GPIO.out_w1tc.val = ((uint32_t)1 << pin);
+#else // plain ESP32
     if ( pin < 32 )
         GPIO.out_w1tc = ((uint32_t)1 << pin);
-    else if ( pin < 34 )
+    else if ( pin < 46 )
         GPIO.out1_w1tc.val = ((uint32_t)1 << (pin - 32));
+#endif
 }
 
 static inline __attribute__((always_inline))
 void directWriteHigh(IO_REG_TYPE pin)
 {
+#if CONFIG_IDF_TARGET_ESP32C3
+    GPIO.out_w1ts.val = ((uint32_t)1 << pin);
+#else // plain ESP32
     if ( pin < 32 )
         GPIO.out_w1ts = ((uint32_t)1 << pin);
-    else if ( pin < 34 )
+    else if ( pin < 46 )
         GPIO.out1_w1ts.val = ((uint32_t)1 << (pin - 32));
+#endif
 }
 
 static inline __attribute__((always_inline))
 void directModeInput(IO_REG_TYPE pin)
 {
+#if CONFIG_IDF_TARGET_ESP32C3
+    GPIO.enable_w1tc.val = ((uint32_t)1 << (pin));
+#else
     if ( digitalPinIsValid(pin) )
     {
-        #if defined(ESP_ARDUINO_VERSION)
-        #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(2, 0, 0)
-        int pin_io = rtc_io_number_get((gpio_num_t)pin);
-        uint32_t rtc_reg(rtc_io_desc[pin_io].reg);
-
-        if ( rtc_reg ) // RTC pins PULL settings
-        {
-            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[pin_io].mux);
-            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[pin_io].pullup | rtc_io_desc[pin_io].pulldown);
-        }
-        #endif
-        #else
+#if ESP_IDF_VERSION_MAJOR < 4      // IDF 3.x ESP32/PICO-D4
         uint32_t rtc_reg(rtc_gpio_desc[pin].reg);
 
         if ( rtc_reg ) // RTC pins PULL settings
@@ -177,40 +181,25 @@ void directModeInput(IO_REG_TYPE pin)
             ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].mux);
             ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].pullup | rtc_gpio_desc[pin].pulldown);
         }
-        #endif
-
+#endif
+	// Input
         if ( pin < 32 )
             GPIO.enable_w1tc = ((uint32_t)1 << pin);
         else
             GPIO.enable1_w1tc.val = ((uint32_t)1 << (pin - 32));
-
-        uint32_t pinFunction((uint32_t)2 << FUN_DRV_S); // what are the drivers?
-        pinFunction |= FUN_IE; // input enable but required for output as well?
-        pinFunction |= ((uint32_t)2 << MCU_SEL_S);
-
-        ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;
-
-        GPIO.pin[pin].val = 0;
     }
+#endif
 }
 
 static inline __attribute__((always_inline))
 void directModeOutput(IO_REG_TYPE pin)
 {
+#if CONFIG_IDF_TARGET_ESP32C3
+    GPIO.enable_w1ts.val = ((uint32_t)1 << (pin));
+#else
     if ( digitalPinIsValid(pin) && pin <= 33 ) // pins above 33 can be only inputs
     {
-        #if defined(ESP_ARDUINO_VERSION)
-        #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(2, 0, 0)
-        int pin_io = rtc_io_number_get((gpio_num_t)pin);
-        uint32_t rtc_reg(rtc_io_desc[pin_io].reg);
-
-        if ( rtc_reg ) // RTC pins PULL settings
-        {
-            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[pin_io].mux);
-            ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_io_desc[pin_io].pullup | rtc_io_desc[pin_io].pulldown);
-        }
-        #endif
-        #else
+#if ESP_IDF_VERSION_MAJOR < 4      // IDF 3.x ESP32/PICO-D4
         uint32_t rtc_reg(rtc_gpio_desc[pin].reg);
 
         if ( rtc_reg ) // RTC pins PULL settings
@@ -218,21 +207,14 @@ void directModeOutput(IO_REG_TYPE pin)
             ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].mux);
             ESP_REG(rtc_reg) = ESP_REG(rtc_reg) & ~(rtc_gpio_desc[pin].pullup | rtc_gpio_desc[pin].pulldown);
         }
-        #endif
-
+#endif
+        // Output
         if ( pin < 32 )
             GPIO.enable_w1ts = ((uint32_t)1 << pin);
         else // already validated to pins <= 33
             GPIO.enable1_w1ts.val = ((uint32_t)1 << (pin - 32));
-
-        uint32_t pinFunction((uint32_t)2 << FUN_DRV_S); // what are the drivers?
-        pinFunction |= FUN_IE; // input enable but required for output as well?
-        pinFunction |= ((uint32_t)2 << MCU_SEL_S);
-
-        ESP_REG(DR_REG_IO_MUX_BASE + esp32_gpioMux[pin].reg) = pinFunction;
-
-        GPIO.pin[pin].val = 0;
     }
+#endif
 }
 
 #define DIRECT_READ(base, pin)          directRead(pin)
@@ -445,6 +427,20 @@ void directWriteHigh(IO_REG_TYPE mask)
 #define DIRECT_MODE_INPUT(base, mask)    directModeInput(mask)
 #define DIRECT_MODE_OUTPUT(base, mask)   directModeOutput(mask)
 
+#elif defined(ARDUINO_ARCH_MBED_RP2040)|| defined(ARDUINO_ARCH_RP2040)
+#define delayMicroseconds(time)         busy_wait_us(time)
+#define PIN_TO_BASEREG(pin)             (0)
+#define PIN_TO_BITMASK(pin)             (pin)
+#define IO_REG_TYPE unsigned int
+#define IO_REG_BASE_ATTR
+#define IO_REG_MASK_ATTR
+#define DIRECT_READ(base, pin)          digitalRead(pin)
+#define DIRECT_WRITE_LOW(base, pin)     digitalWrite(pin, LOW)
+#define DIRECT_WRITE_HIGH(base, pin)    digitalWrite(pin, HIGH)
+#define DIRECT_MODE_INPUT(base, pin)    pinMode(pin,INPUT)
+#define DIRECT_MODE_OUTPUT(base, pin)   pinMode(pin,OUTPUT)
+#warning "OneWire. RP2040 in Fallback mode. Using API calls for pinMode,digitalRead and digitalWrite."
+
 #else
 #define PIN_TO_BASEREG(pin)             (0)
 #define PIN_TO_BITMASK(pin)             (pin)
@@ -460,4 +456,4 @@ void directWriteHigh(IO_REG_TYPE mask)
 
 #endif
 
-#endif
+#endif
\ No newline at end of file