diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/common_objects.h b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/common_objects.h
index 68cdb7ce89..2c31a3f197 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/common_objects.h
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/common_objects.h
@@ -69,6 +69,8 @@ struct serial_s {
 };
 
 struct spi_s {
+    SPI_HandleTypeDef handle;
+    IRQn_Type spiIRQ;
     SPIName spi;
     uint32_t bits;
     uint32_t cpol;
@@ -80,6 +82,11 @@ struct spi_s {
     PinName pin_mosi;
     PinName pin_sclk;
     PinName pin_ssel;
+#ifdef DEVICE_SPI_ASYNCH
+    uint32_t event;
+    uint8_t module;
+    uint8_t transfer_type;
+#endif
 };
 
 #include "gpio_object.h"
diff --git a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c
index f2fae81534..7500b50276 100644
--- a/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c
+++ b/hal/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c
@@ -32,42 +32,69 @@
 #include "spi_api.h"
 
 #if DEVICE_SPI
-
+#include <stdbool.h>
 #include <math.h>
+#include <string.h>
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
-#include "mbed_error.h"
 
-static SPI_HandleTypeDef SpiHandle;
+#if DEVICE_SPI_ASYNCH
+    #define SPI_INST(obj)    ((SPI_TypeDef *)(obj->spi.spi))
+#else
+    #define SPI_INST(obj)    ((SPI_TypeDef *)(obj->spi))
+#endif
+
+#if DEVICE_SPI_ASYNCH
+    #define SPI_S(obj)    (( struct spi_s *)(&(obj->spi)))
+#else
+    #define SPI_S(obj)    (( struct spi_s *)(obj))
+#endif
+
+#ifndef DEBUG_STDIO
+#   define DEBUG_STDIO 0
+#endif
+
+#if DEBUG_STDIO
+#   include <stdio.h>
+#   define DEBUG_PRINTF(...) do { printf(__VA_ARGS__); } while(0)
+#else
+#   define DEBUG_PRINTF(...) {}
+#endif
 
 static void init_spi(spi_t *obj)
 {
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
 
-    __HAL_SPI_DISABLE(&SpiHandle);
+    handle->Instance = SPI_INST(obj);
+    __HAL_SPI_DISABLE(handle);
 
-    SpiHandle.Init.Mode              = obj->mode;
-    SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
-    SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
-    SpiHandle.Init.CLKPhase          = obj->cpha;
-    SpiHandle.Init.CLKPolarity       = obj->cpol;
-    SpiHandle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLED;
-    SpiHandle.Init.CRCPolynomial     = 7;
-    SpiHandle.Init.DataSize          = obj->bits;
-    SpiHandle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
-    SpiHandle.Init.NSS               = obj->nss;
-    SpiHandle.Init.TIMode            = SPI_TIMODE_DISABLED;
+    DEBUG_PRINTF("init_spi: instance=0x%8X\r\n", (int)handle->Instance);
 
-    if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
+    handle->Init.Mode              = spiobj->mode;
+    handle->Init.BaudRatePrescaler = spiobj->br_presc;
+    handle->Init.Direction         = SPI_DIRECTION_2LINES;
+    handle->Init.CLKPhase          = spiobj->cpha;
+    handle->Init.CLKPolarity       = spiobj->cpol;
+    handle->Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLED;
+    handle->Init.CRCPolynomial     = 7;
+    handle->Init.DataSize          = (spiobj->bits == 16) ? SPI_DATASIZE_16BIT : SPI_DATASIZE_8BIT;
+    handle->Init.FirstBit          = SPI_FIRSTBIT_MSB;
+    handle->Init.NSS               = spiobj->nss;
+    handle->Init.TIMode            = SPI_TIMODE_DISABLED;
+
+    if (HAL_SPI_Init(handle) != HAL_OK) {
         error("Cannot initialize SPI");
     }
 
-    __HAL_SPI_ENABLE(&SpiHandle);
+    __HAL_SPI_ENABLE(handle);
 }
 
 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
 {
+    struct spi_s *spiobj = SPI_S(obj);
+
     // Determine the SPI to use
     SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
     SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
@@ -77,39 +104,45 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
     SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
     SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
 
-    obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
-    MBED_ASSERT(obj->spi != (SPIName)NC);
+    spiobj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
+    MBED_ASSERT(spiobj->spi != (SPIName)NC);
 
     // Enable SPI clock
-    if (obj->spi == SPI_1) {
+    if (spiobj->spi == SPI_1) {
         __HAL_RCC_SPI1_CLK_ENABLE();
+        spiobj->spiIRQ = SPI1_IRQn;
     }
 
-    if (obj->spi == SPI_2) {
+    if (spiobj->spi == SPI_2) {
         __HAL_RCC_SPI2_CLK_ENABLE();
+        spiobj->spiIRQ = SPI2_IRQn;
     }
 
 #if defined SPI3_BASE
-    if (obj->spi == SPI_3) {
+    if (spiobj->spi == SPI_3) {
         __HAL_RCC_SPI3_CLK_ENABLE();
+        spiobj->spiIRQ = SPI3_IRQn;
     }
 #endif
 
 #if defined SPI4_BASE
-    if (obj->spi == SPI_4) {
+    if (spiobj->spi == SPI_4) {
         __HAL_RCC_SPI4_CLK_ENABLE();
+        spiobj->spiIRQ = SPI4_IRQn;
     }
 #endif
 
 #if defined SPI5_BASE
-    if (obj->spi == SPI_5) {
+    if (spiobj->spi == SPI_5) {
         __HAL_RCC_SPI5_CLK_ENABLE();
+        spiobj->spiIRQ = SPI5_IRQn;
     }
 #endif
 
 #if defined SPI6_BASE
-    if (obj->spi == SPI_6) {
+    if (spiobj->spi == SPI_6) {
         __HAL_RCC_SPI6_CLK_ENABLE();
+        spiobj->spiIRQ = SPI6_IRQn;
     }
 #endif
 
@@ -118,21 +151,23 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
     pinmap_pinout(miso, PinMap_SPI_MISO);
     pinmap_pinout(sclk, PinMap_SPI_SCLK);
 
-    // Save new values
-    obj->bits = SPI_DATASIZE_8BIT;
-    obj->cpol = SPI_POLARITY_LOW;
-    obj->cpha = SPI_PHASE_1EDGE;
-    obj->br_presc = SPI_BAUDRATEPRESCALER_256;
+    // Save default values
+    spiobj->bits = 8;
+    spiobj->mode = SPI_MODE_MASTER;
 
-    obj->pin_miso = miso;
-    obj->pin_mosi = mosi;
-    obj->pin_sclk = sclk;
-    obj->pin_ssel = ssel;
+    spiobj->cpol = SPI_POLARITY_LOW;
+    spiobj->cpha = SPI_PHASE_1EDGE;
+    spiobj->br_presc = SPI_BAUDRATEPRESCALER_256;
+
+    spiobj->pin_miso = miso;
+    spiobj->pin_mosi = mosi;
+    spiobj->pin_sclk = sclk;
+    spiobj->pin_ssel = ssel;
 
     if (ssel != NC) {
         pinmap_pinout(ssel, PinMap_SPI_SSEL);
     } else {
-        obj->nss = SPI_NSS_SOFT;
+        spiobj->nss = SPI_NSS_SOFT;
     }
 
     init_spi(obj);
@@ -140,20 +175,28 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
 
 void spi_free(spi_t *obj)
 {
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
+    DEBUG_PRINTF("spi_free\r\n");
+
+    __HAL_SPI_DISABLE(handle);
+    HAL_SPI_DeInit(handle);
+
     // Reset SPI and disable clock
-    if (obj->spi == SPI_1) {
+    if (spiobj->spi == SPI_1) {
         __HAL_RCC_SPI1_FORCE_RESET();
         __HAL_RCC_SPI1_RELEASE_RESET();
         __HAL_RCC_SPI1_CLK_DISABLE();
     }
 
-    if (obj->spi == SPI_2) {
+    if (spiobj->spi == SPI_2) {
         __HAL_RCC_SPI2_FORCE_RESET();
         __HAL_RCC_SPI2_RELEASE_RESET();
         __HAL_RCC_SPI2_CLK_DISABLE();
     }
 #if defined SPI3_BASE
-    if (obj->spi == SPI_3) {
+    if (spiobj->spi == SPI_3) {
         __HAL_RCC_SPI3_FORCE_RESET();
         __HAL_RCC_SPI3_RELEASE_RESET();
         __HAL_RCC_SPI3_CLK_DISABLE();
@@ -161,7 +204,7 @@ void spi_free(spi_t *obj)
 #endif
 
 #if defined SPI4_BASE
-    if (obj->spi == SPI_4) {
+    if (spiobj->spi == SPI_4) {
         __HAL_RCC_SPI4_FORCE_RESET();
         __HAL_RCC_SPI4_RELEASE_RESET();
         __HAL_RCC_SPI4_CLK_DISABLE();
@@ -169,7 +212,7 @@ void spi_free(spi_t *obj)
 #endif
 
 #if defined SPI5_BASE
-    if (obj->spi == SPI_5) {
+    if (spiobj->spi == SPI_5) {
         __HAL_RCC_SPI5_FORCE_RESET();
         __HAL_RCC_SPI5_RELEASE_RESET();
         __HAL_RCC_SPI5_CLK_DISABLE();
@@ -177,7 +220,7 @@ void spi_free(spi_t *obj)
 #endif
 
 #if defined SPI6_BASE
-    if (obj->spi == SPI_6) {
+    if (spiobj->spi == SPI_6) {
         __HAL_RCC_SPI6_FORCE_RESET();
         __HAL_RCC_SPI6_RELEASE_RESET();
         __HAL_RCC_SPI6_CLK_DISABLE();
@@ -185,45 +228,47 @@ void spi_free(spi_t *obj)
 #endif
 
     // Configure GPIOs
-    pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
-    pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+    pin_function(spiobj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+    pin_function(spiobj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+    pin_function(spiobj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+    if (spiobj->nss != SPI_NSS_SOFT) {
+        pin_function(spiobj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+    }
 }
 
 void spi_format(spi_t *obj, int bits, int mode, int slave)
 {
+    struct spi_s *spiobj = SPI_S(obj);
+
+    DEBUG_PRINTF("spi_format, bits:%d, mode:%d, slave?:%d\r\n", bits, mode, slave);
+
     // Save new values
-    if (bits == 16) {
-        obj->bits = SPI_DATASIZE_16BIT;
-    } else {
-        obj->bits = SPI_DATASIZE_8BIT;
-    }
+    spiobj->bits = bits;
 
     switch (mode) {
         case 0:
-            obj->cpol = SPI_POLARITY_LOW;
-            obj->cpha = SPI_PHASE_1EDGE;
+            spiobj->cpol = SPI_POLARITY_LOW;
+            spiobj->cpha = SPI_PHASE_1EDGE;
             break;
         case 1:
-            obj->cpol = SPI_POLARITY_LOW;
-            obj->cpha = SPI_PHASE_2EDGE;
+            spiobj->cpol = SPI_POLARITY_LOW;
+            spiobj->cpha = SPI_PHASE_2EDGE;
             break;
         case 2:
-            obj->cpol = SPI_POLARITY_HIGH;
-            obj->cpha = SPI_PHASE_1EDGE;
+            spiobj->cpol = SPI_POLARITY_HIGH;
+            spiobj->cpha = SPI_PHASE_1EDGE;
             break;
         default:
-            obj->cpol = SPI_POLARITY_HIGH;
-            obj->cpha = SPI_PHASE_2EDGE;
+            spiobj->cpol = SPI_POLARITY_HIGH;
+            spiobj->cpha = SPI_PHASE_2EDGE;
             break;
     }
 
-    if (obj->nss != SPI_NSS_SOFT) {
-        obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
+    if (spiobj->nss != SPI_NSS_SOFT) {
+        spiobj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
     }
 
-    obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
+    spiobj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
 
     init_spi(obj);
 }
@@ -239,11 +284,14 @@ static const uint16_t baudrate_prescaler_table[] =	{SPI_BAUDRATEPRESCALER_2,
 
 void spi_frequency(spi_t *obj, int hz)
 {
+    struct spi_s *spiobj = SPI_S(obj);
 	int spi_hz = 0;
 	uint8_t prescaler_rank = 0;
 
+    DEBUG_PRINTF("spi_frequency:%d\r\n", hz);
+
 	/* Get source clock depending on SPI instance */
-    switch ((int)obj->spi) {
+    switch ((int)spiobj->spi) {
         case SPI_1:
 #if defined SPI4_BASE
         case SPI_4:
@@ -275,7 +323,7 @@ void spi_frequency(spi_t *obj, int hz)
 	}
 
 	if (prescaler_rank <= sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0])) {
-		obj->br_presc = baudrate_prescaler_table[prescaler_rank-1];
+		spiobj->br_presc = baudrate_prescaler_table[prescaler_rank-1];
 	} else {
 		error("Couldn't setup requested SPI frequency");
 	}
@@ -286,31 +334,35 @@ void spi_frequency(spi_t *obj, int hz)
 static inline int ssp_readable(spi_t *obj)
 {
     int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
     // Check if data is received
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
+    status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
     return status;
 }
 
 static inline int ssp_writeable(spi_t *obj)
 {
     int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
     // Check if data is transmitted
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
+    status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
     return status;
 }
 
 static inline void ssp_write(spi_t *obj, int value)
 {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+    SPI_TypeDef *spi = SPI_INST(obj);
     while (!ssp_writeable(obj));
     spi->DR = (uint16_t)value;
 }
 
 static inline int ssp_read(spi_t *obj)
 {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+    SPI_TypeDef *spi = SPI_INST(obj);
     while (!ssp_readable(obj));
     return (int)spi->DR;
 }
@@ -318,8 +370,10 @@ static inline int ssp_read(spi_t *obj)
 static inline int ssp_busy(spi_t *obj)
 {
     int status;
-    SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
-    status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
+    status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
     return status;
 }
 
@@ -336,14 +390,14 @@ int spi_slave_receive(spi_t *obj)
 
 int spi_slave_read(spi_t *obj)
 {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+    SPI_TypeDef *spi = SPI_INST(obj);
     while (!ssp_readable(obj));
     return (int)spi->DR;
 }
 
 void spi_slave_write(spi_t *obj, int value)
 {
-    SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
+    SPI_TypeDef *spi = SPI_INST(obj);
     while (!ssp_writeable(obj));
     spi->DR = (uint16_t)value;
 }
@@ -353,4 +407,221 @@ int spi_busy(spi_t *obj)
     return ssp_busy(obj);
 }
 
+#ifdef DEVICE_SPI_ASYNCH
+typedef enum {
+    SPI_TRANSFER_TYPE_NONE = 0,
+    SPI_TRANSFER_TYPE_TX = 1,
+    SPI_TRANSFER_TYPE_RX = 2,
+    SPI_TRANSFER_TYPE_TXRX = 3,
+} transfer_type_t;
+
+
+/// @returns the number of bytes transferred, or `0` if nothing transferred
+static int spi_master_start_asynch_transfer(spi_t *obj, transfer_type_t transfer_type, const void *tx, void *rx, size_t length)
+{
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+    bool is16bit = (handle->Init.DataSize == SPI_DATASIZE_16BIT);
+    // the HAL expects number of transfers instead of number of bytes
+    // so for 16 bit transfer width the count needs to be halved
+    size_t words;
+
+    DEBUG_PRINTF("SPI inst=0x%8X Start: %u, %u\r\n", (int)handle->Instance, transfer_type, length);
+
+    obj->spi.transfer_type = transfer_type;
+
+    if (is16bit) words = length / 2;
+    else         words = length;
+
+    // enable the interrupt
+    IRQn_Type irq_n = spiobj->spiIRQ;
+    NVIC_ClearPendingIRQ(irq_n);
+    NVIC_DisableIRQ(irq_n);
+    NVIC_SetPriority(irq_n, 1);
+    NVIC_EnableIRQ(irq_n);
+
+    // enable the right hal transfer
+    static uint16_t sink;
+    int rc = 0;
+    switch(transfer_type) {
+        case SPI_TRANSFER_TYPE_TXRX:
+            rc = HAL_SPI_TransmitReceive_IT(handle, (uint8_t*)tx, (uint8_t*)rx, words);
+            break;
+        case SPI_TRANSFER_TYPE_TX:
+            // TODO: we do not use `HAL_SPI_Transmit_IT`, since it has some unknown bug
+            // and makes the HAL keep some state and then that fails successive transfers
+            // rc = HAL_SPI_Transmit_IT(handle, (uint8_t*)tx, words);
+            rc = HAL_SPI_TransmitReceive_IT(handle, (uint8_t*)tx, (uint8_t*)&sink, 1);
+            length = is16bit ? 2 : 1;
+            break;
+        case SPI_TRANSFER_TYPE_RX:
+            // the receive function also "transmits" the receive buffer so in order
+            // to guarantee that 0xff is on the line, we explicitly memset it here
+            memset(rx, SPI_FILL_WORD, length);
+            rc = HAL_SPI_Receive_IT(handle, (uint8_t*)rx, words);
+            break;
+        default:
+            length = 0;
+    }
+
+    if (rc) {
+        DEBUG_PRINTF("SPI: RC=%u\n", rc);
+        length = 0;
+    }
+
+    return length;
+}
+
+// asynchronous API
+void spi_master_transfer(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint8_t bit_width, uint32_t handler, uint32_t event, DMAUsage hint)
+{
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
+    // TODO: DMA usage is currently ignored
+    (void) hint;
+
+    // check which use-case we have
+    bool use_tx = (tx != NULL && tx_length > 0);
+    bool use_rx = (rx != NULL && rx_length > 0);
+    bool is16bit = (handle->Init.DataSize == SPI_DATASIZE_16BIT);
+
+    // don't do anything, if the buffers aren't valid
+    if (!use_tx && !use_rx)
+        return;
+
+    // copy the buffers to the SPI object
+    obj->tx_buff.buffer = (void *) tx;
+    obj->tx_buff.length = tx_length;
+    obj->tx_buff.pos = 0;
+    obj->tx_buff.width = is16bit ? 16 : 8;
+
+    obj->rx_buff.buffer = rx;
+    obj->rx_buff.length = rx_length;
+    obj->rx_buff.pos = 0;
+    obj->rx_buff.width = obj->tx_buff.width;
+
+    obj->spi.event = event;
+
+    DEBUG_PRINTF("SPI: Transfer: %u, %u\n", tx_length, rx_length);
+
+    // register the thunking handler
+    IRQn_Type irq_n = spiobj->spiIRQ;
+    NVIC_SetVector(irq_n, (uint32_t)handler);
+
+    // enable the right hal transfer
+    if (use_tx && use_rx) {
+        // transfer with the min(tx, rx), then later either transmit _or_ receive the remainder
+        size_t size = (tx_length < rx_length)? tx_length : rx_length;
+        spi_master_start_asynch_transfer(obj, SPI_TRANSFER_TYPE_TXRX, tx, rx, size);
+    } else if (use_tx) {
+        spi_master_start_asynch_transfer(obj, SPI_TRANSFER_TYPE_TX, tx, NULL, tx_length);
+    } else if (use_rx) {
+        spi_master_start_asynch_transfer(obj, SPI_TRANSFER_TYPE_RX, NULL, rx, rx_length);
+    }
+}
+
+uint32_t spi_irq_handler_asynch(spi_t *obj)
+{
+    // use the right instance
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &spiobj->handle;
+    int event = 0;
+
+    // call the CubeF4 handler, this will update the handle
+    HAL_SPI_IRQHandler(handle);
+
+    if (HAL_SPI_GetState(handle) == HAL_SPI_STATE_READY) {
+        // adjust buffer positions
+        size_t tx_size = (handle->TxXferSize - handle->TxXferCount);
+        size_t rx_size = (handle->RxXferSize - handle->RxXferCount);
+        // 16 bit transfers need to be doubled to get bytes
+        if (handle->Init.DataSize == SPI_DATASIZE_16BIT) {
+            tx_size *= 2;
+            rx_size *= 2;
+        }
+        // adjust buffer positions
+        if (obj->spi.transfer_type != SPI_TRANSFER_TYPE_RX) {
+            obj->tx_buff.pos += tx_size;
+        }
+        if (obj->spi.transfer_type != SPI_TRANSFER_TYPE_TX) {
+            obj->rx_buff.pos += rx_size;
+        }
+
+        if (handle->TxXferCount > 0) {DEBUG_PRINTF("SPI: TxXferCount: %u\n", handle->TxXferCount);}
+        if (handle->RxXferCount > 0) {DEBUG_PRINTF("SPI: RxXferCount: %u\n", handle->RxXferCount);}
+
+        int error = HAL_SPI_GetError(handle);
+        if(error != HAL_SPI_ERROR_NONE) {
+            // something went wrong and the transfer has definitely completed
+            event = SPI_EVENT_ERROR | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE;
+
+            if (error & HAL_SPI_ERROR_OVR) {
+                // buffer overrun
+                event |= SPI_EVENT_RX_OVERFLOW;
+            }
+        } else {
+            // figure out if we need to transfer more data:
+            if (obj->tx_buff.pos < obj->tx_buff.length) {
+                //DEBUG_PRINTF("t%u ", obj->tx_buff.pos);
+                // we need to transfer more data
+                spi_master_start_asynch_transfer(obj, SPI_TRANSFER_TYPE_TX,
+                    obj->tx_buff.buffer + obj->tx_buff.pos,     // offset the initial buffer by the position
+                    NULL,                                       // there is no receive buffer
+                    obj->tx_buff.length - obj->tx_buff.pos);    // transfer the remaining bytes only
+            } else if (obj->rx_buff.pos < obj->rx_buff.length) {
+                //DEBUG_PRINTF("r%u ", obj->rx_buff.pos);
+                // we need to receive more data
+                spi_master_start_asynch_transfer(obj, SPI_TRANSFER_TYPE_RX,
+                    NULL,                                       // there is no transmit buffer
+                    obj->rx_buff.buffer + obj->rx_buff.pos,     // offset the initial buffer by the position
+                    obj->rx_buff.length - obj->rx_buff.pos);    // transfer one byte at a time, until we received everything
+            } else {
+                // everything is ok, nothing else needs to be transferred
+                event = SPI_EVENT_COMPLETE | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE;
+                DEBUG_PRINTF("SPI: Done: %u, %u\n", obj->tx_buff.pos, obj->rx_buff.pos);
+            }
+        }
+    }
+
+    if (event) DEBUG_PRINTF("SPI: Event: 0x%x\n", event);
+
+    return (event & (obj->spi.event | SPI_EVENT_INTERNAL_TRANSFER_COMPLETE));
+}
+
+uint8_t spi_active(spi_t *obj)
+{
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+    HAL_SPI_StateTypeDef state = HAL_SPI_GetState(handle);
+
+    switch(state) {
+        case HAL_SPI_STATE_RESET:
+        case HAL_SPI_STATE_READY:
+        case HAL_SPI_STATE_ERROR:
+            return 0;
+        default:
+            return 1;
+    }
+}
+
+void spi_abort_asynch(spi_t *obj)
+{
+    struct spi_s *spiobj = SPI_S(obj);
+    SPI_HandleTypeDef *handle = &(spiobj->handle);
+
+    // disable interrupt
+    IRQn_Type irq_n = spiobj->spiIRQ;
+    NVIC_ClearPendingIRQ(irq_n);
+    NVIC_DisableIRQ(irq_n);
+
+    // clean-up
+    __HAL_SPI_DISABLE(handle);
+    HAL_SPI_DeInit(handle);
+    HAL_SPI_Init(handle);
+    __HAL_SPI_ENABLE(handle);
+}
+
+#endif //DEVICE_SPI_ASYNCH
+
 #endif