RP2040 uart support (#3990)

esphome/components/uart/uart_component_rp2040.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#ifdef USE_RP2040
+
+#include <SerialPIO.h>
+#include <SerialUART.h>
+
+#include <vector>
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+#include "uart_component.h"
+
+namespace esphome {
+namespace uart {
+
+class RP2040UartComponent : public UARTComponent, public Component {
+ public:
+  void setup() override;
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::BUS; }
+
+  void write_array(const uint8_t *data, size_t len) override;
+
+  bool peek_byte(uint8_t *data) override;
+  bool read_array(uint8_t *data, size_t len) override;
+
+  int available() override;
+  void flush() override;
+
+  uint16_t get_config();
+
+ protected:
+  void check_logger_conflict() override {}
+  bool hw_serial_{false};
+
+  HardwareSerial *serial_{nullptr};
+};
+
+}  // namespace uart
+}  // namespace esphome
+
+#endif  // USE_RP2040