diff --git a/cores/realtek-ambz/arduino/libraries/SPI/SPI.cpp b/cores/realtek-ambz/arduino/libraries/SPI/SPI.cpp
new file mode 100644
index 000000000..d1ab36270
--- /dev/null
+++ b/cores/realtek-ambz/arduino/libraries/SPI/SPI.cpp
@@ -0,0 +1,106 @@
+/* Copyright (c) Kuba Szczodrzyński 2023-09-23. */
+
+#include "SPIPrivate.h"
+
+bool SPIClass::begin() {
+	if (!this->setPinsPrivate(PIN_INVALID, PIN_INVALID, PIN_INVALID))
+		return false;
+
+	LT_DM(SPI, "Begin: sck=%d, miso=%d, mosi=%d, port=%d", this->sck, this->miso, this->mosi, this->port);
+
+	if (!this->data) {
+		this->data		= new SPIData();
+		this->data->spi = SPI_DEV_TABLE[this->port].SPIx;
+		this->data->irq = (IRQn)SPI_DEV_TABLE[this->port].IrqNum;
+
+		switch (this->port) {
+			case 0:
+				RCC_PeriphClockCmd(APBPeriph_SPI0, APBPeriph_SPI0_CLOCK, ENABLE);
+				break;
+			case 1:
+				RCC_PeriphClockCmd(APBPeriph_SPI1, APBPeriph_SPI1_CLOCK, ENABLE);
+				break;
+		}
+	}
+
+	Pinmux_Config(this->sck, PINMUX_FUNCTION_SPIM);
+	Pinmux_Config(this->miso, PINMUX_FUNCTION_SPIM);
+	Pinmux_Config(this->mosi, PINMUX_FUNCTION_SPIM);
+
+	SSI_InitTypeDef *init = &this->data->init;
+	SPI_TypeDef *spi	  = this->data->spi;
+	IRQn irq			  = this->data->irq;
+	SSI_StructInit(init);
+	init->SPI_Role = SSI_MASTER;
+
+	SSI_Cmd(spi, DISABLE);
+	SSI_Init(spi, init);
+	SSI_Cmd(spi, ENABLE);
+
+	// VECTOR_IrqUnRegister(irq);
+	// VECTOR_IrqRegister((IRQ_FUN)callback, irq, (u32)this->data, 10);
+	// VECTOR_IrqEn(irq, 10);
+
+	return true;
+}
+
+bool SPIClass::end() {
+	if (!this->data)
+		return true;
+	SPI_TypeDef *spi = this->data->spi;
+	IRQn irq		 = this->data->irq;
+
+	SSI_INTConfig(spi, BIT_IMR_RXFIM | BIT_IMR_RXOIM | BIT_IMR_RXUIM, DISABLE);
+	VECTOR_IrqDis(irq);
+	VECTOR_IrqUnRegister(irq);
+	SSI_Cmd(spi, DISABLE);
+
+	delete this->data;
+	this->data = nullptr;
+	return true;
+}
+
+void SPIClass::setFrequency(uint32_t frequency) {
+	if (!this->data)
+		return;
+	uint32_t maxFrequency = CPU_ClkGet(false) >> 2;
+	if (frequency > maxFrequency) {
+		LT_EM(SPI, "Clock freq too high! %lu > %lu", frequency, maxFrequency);
+		SSI_SetBaud(this->data->spi, maxFrequency, maxFrequency << 1);
+	} else {
+
+		SSI_SetBaud(this->data->spi, frequency, maxFrequency << 1);
+	}
+	this->settings._clock = frequency;
+}
+
+void SPIClass::setClockDivider(uint32_t clockDiv) {
+	if (!this->data)
+		return;
+	if (clockDiv < 4) {
+		LT_EM(SPI, "Clock div too low! %lu < 4", clockDiv);
+		return;
+	}
+	SSI_SetBaudDiv(this->data->spi, clockDiv << 1);
+	this->settings._clock = CPU_ClkGet(false) / clockDiv;
+}
+
+void SPIClass::setDataMode(uint8_t dataMode) {
+	if (!this->data)
+		return;
+	this->settings._dataMode = dataMode;
+	SSI_SetSclkPolarity(this->data->spi, (dataMode >> 1) & 0b1);
+	SSI_SetSclkPhase(this->data->spi, (dataMode >> 0) & 0b1);
+}
+
+uint8_t SPIClass::transfer(uint8_t data) {
+	while ((SPI1_DEV->SR & BIT_SR_TFNF) == 0) {}
+	SPI1_DEV->DR[0] = data;
+	while ((SPI1_DEV->SR & BIT_SR_RFNE) == 0) {}
+	return SPI1_DEV->DR[0];
+}
+
+void SPIClass::write(uint8_t data) {
+	while ((SPI1_DEV->SR & BIT_SR_TFNF) == 0) {}
+	SPI1_DEV->DR[0] = data;
+}
diff --git a/cores/realtek-ambz/arduino/libraries/SPI/SPIPrivate.h b/cores/realtek-ambz/arduino/libraries/SPI/SPIPrivate.h
new file mode 100644
index 000000000..f65c59e47
--- /dev/null
+++ b/cores/realtek-ambz/arduino/libraries/SPI/SPIPrivate.h
@@ -0,0 +1,12 @@
+/* Copyright (c) Kuba Szczodrzyński 2023-09-23. */
+
+#pragma once
+
+#include <ArduinoPrivate.h>
+#include <SPI.h>
+
+struct SPIData {
+	SSI_InitTypeDef init;
+	SPI_TypeDef *spi;
+	IRQn irq;
+};
diff --git a/cores/realtek-ambz/arduino/src/lt_defs.h b/cores/realtek-ambz/arduino/src/lt_defs.h
index f37e5bf88..674284a0c 100644
--- a/cores/realtek-ambz/arduino/src/lt_defs.h
+++ b/cores/realtek-ambz/arduino/src/lt_defs.h
@@ -4,5 +4,6 @@
 
 #define LT_ARD_HAS_SERIAL	  1
 #define LT_ARD_HAS_SOFTSERIAL 1
+#define LT_ARD_HAS_SPI		  1
 #define LT_ARD_HAS_WIRE		  1
 #define LT_ARD_MD5_MBEDTLS	  1
diff --git a/cores/realtek-ambz/base/sdk_extern.h b/cores/realtek-ambz/base/sdk_extern.h
index 131f623f3..a4a508117 100644
--- a/cores/realtek-ambz/base/sdk_extern.h
+++ b/cores/realtek-ambz/base/sdk_extern.h
@@ -11,6 +11,7 @@ extern "C" {
 
 int LOGUART_SetBaud(uint32_t BaudRate);	   // from fixups/log_uart.c
 void DumpForOneBytes(void *addr, int cnt); // cnt max 0x70!
+void SSI_SetBaudDiv(SPI_TypeDef *spi_dev, uint32_t ClockDivider);
 
 #ifdef __cplusplus
 } // extern "C"