diff --git a/meson.build b/meson.build
index 59031984..c828c38d 100644
--- a/meson.build
+++ b/meson.build
@@ -255,6 +255,8 @@ gd77_def = def + mk22fn512_def + {'PLATFORM_GD77': ''}
 dm1801_src = src + mk22fn512_src + ['platform/targets/DM-1801/platform.c',
                                     'platform/drivers/display/UC1701_GD77.c',
                                     'platform/drivers/keyboard/keyboard_GD77.c',
+                                    'platform/drivers/NVM/W25Qx.c',
+                                    'platform/drivers/NVM/spiFlash_GDx.c',
                                     'platform/drivers/ADC/ADC0_GDx.c',
                                     'platform/drivers/baseband/rtx_GDx.c']
 
diff --git a/platform/drivers/NVM/spiFlash_GDx.c b/platform/drivers/NVM/spiFlash_GDx.c
new file mode 100644
index 00000000..c0ce750c
--- /dev/null
+++ b/platform/drivers/NVM/spiFlash_GDx.c
@@ -0,0 +1,74 @@
+/***************************************************************************
+ *   Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO,                    *
+ *                         Niccolò Izzo IU2KIN                             *
+ *                         Frederik Saraci IU2NRO                          *
+ *                         Silvano Seva IU2KWO                             *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 3 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
+ ***************************************************************************/
+
+#include <gpio.h>
+#include <delays.h>
+#include <stdint.h>
+#include <hwconfig.h>
+
+/*
+ * Implementation of external flash SPI interface for GDx devices.
+ * In these radios the SPI communication has to be managed through software bit
+ * banging, since there is no SPI peripheral available.
+ */
+
+uint8_t spiFlash_SendRecv(uint8_t val)
+{
+    uint8_t data = 0;
+    for(uint8_t i = 0; i < 8; i++)
+    {
+        gpio_clearPin(FLASH_CLK);
+        delayUs(1);
+
+        if((val << i) & 0x80)
+        {
+            gpio_setPin(FLASH_SDO);
+        }
+        else
+        {
+            gpio_clearPin(FLASH_SDO);
+        }
+
+        gpio_setPin(FLASH_CLK);
+        delayUs(1);
+
+        data <<= 1;
+        data |= (gpio_readPin(FLASH_SDI)) ? 0x01 : 0x00;
+    }
+
+    return data;
+}
+
+void spiFlash_init()
+{
+    gpio_setMode(FLASH_CLK, OUTPUT);
+    gpio_setMode(FLASH_SDO, OUTPUT);
+    gpio_setMode(FLASH_SDI, INPUT);
+
+    gpio_clearPin(FLASH_CLK);
+    gpio_clearPin(FLASH_SDO);
+}
+
+void spiFlash_terminate()
+{
+    gpio_setMode(FLASH_CLK, INPUT);
+    gpio_setMode(FLASH_SDO, INPUT);
+    gpio_setMode(FLASH_SDI, INPUT);
+}
diff --git a/platform/targets/DM-1801/hwconfig.h b/platform/targets/DM-1801/hwconfig.h
index 79f868ef..b1577853 100644
--- a/platform/targets/DM-1801/hwconfig.h
+++ b/platform/targets/DM-1801/hwconfig.h
@@ -72,4 +72,10 @@
 #define FUNC2_SW GPIOB,1
 #define MONI_SW  GPIOB,9
 
+/* External flash */
+#define FLASH_CS  GPIOE,6
+#define FLASH_CLK GPIOE,5
+#define FLASH_SDO GPIOE,4
+#define FLASH_SDI GPIOA,19
+
 #endif