diff --git a/meson.build b/meson.build
index d527a193..9343c478 100644
--- a/meson.build
+++ b/meson.build
@@ -31,6 +31,7 @@ openrtx_src = ['openrtx/src/core/state.c',
'openrtx/src/core/dsp.cpp',
'openrtx/src/core/cps.c',
'openrtx/src/core/crc.c',
+ 'openrtx/src/core/xmodem.c',
'openrtx/src/core/memory_profiling.cpp',
'openrtx/src/ui/ui.c',
'openrtx/src/ui/ui_main.c',
diff --git a/openrtx/include/core/xmodem.h b/openrtx/include/core/xmodem.h
new file mode 100644
index 00000000..ae191d97
--- /dev/null
+++ b/openrtx/include/core/xmodem.h
@@ -0,0 +1,37 @@
+/***************************************************************************
+ * Copyright (C) 2022 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 *
+ ***************************************************************************/
+
+#ifndef XMODEM_H
+#define XMODEM_H
+
+#include
+#include
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void xmodem_sendPacket(const void *data, size_t size, uint8_t blockNum);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* XMODEM_H */
diff --git a/openrtx/src/core/xmodem.c b/openrtx/src/core/xmodem.c
new file mode 100644
index 00000000..1928a64f
--- /dev/null
+++ b/openrtx/src/core/xmodem.c
@@ -0,0 +1,68 @@
+/***************************************************************************
+ * Copyright (C) 2022 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 *
+ ***************************************************************************/
+
+#include
+#include
+#include
+#include
+#include
+
+#define SOH (0x01) /* start of 128-byte data packet */
+#define STX (0x02) /* start of 1024-byte data packet */
+#define EOT (0x04) /* End Of Transmission */
+#define ACK (0x06) /* ACKnowledge, receive OK */
+#define NAK (0x15) /* Negative ACKnowledge, receiver ERROR, retry */
+#define CAN (0x18) /* two CAN in succession will abort transfer */
+#define CRC (0x43) /* 'C' == 0x43, request 16-bit CRC, use in place of first NAK for CRC mode */
+#define ABT1 (0x41) /* 'A' == 0x41, assume try abort by user typing */
+#define ABT2 (0x61) /* 'a' == 0x61, assume try abort by user typing */
+
+
+
+void xmodem_sendPacket(const void *data, size_t size, uint8_t blockNum)
+{
+ // Bad payload size, null block number or null data pointer: do not send
+ if(((size != 128) && (size != 1024)) || (blockNum == 0) || (data == NULL))
+ {
+ return;
+ }
+
+ uint8_t buf[3] = {SOH, 0x00, 0x00};
+
+ // Override header to STX for 1kB packets
+ if(size > 128)
+ {
+ buf[0] = STX;
+ }
+
+ // Sequence number
+ buf[1] = blockNum;
+ buf[2] = blockNum ^ 0xFF;
+
+ uint16_t crc = crc_ccitt(data, size);
+
+ // Send header, then data and finally CRC
+ vcom_writeBlock(buf, 3);
+ vcom_writeBlock(data, size);
+
+ buf[0] = crc >> 8;
+ buf[1] = crc & 0xFF;
+ vcom_writeBlock(buf, 2);
+}
diff --git a/tests/platform/xmodem_flash_dump.c b/tests/platform/xmodem_flash_dump.c
new file mode 100644
index 00000000..d72f5d17
--- /dev/null
+++ b/tests/platform/xmodem_flash_dump.c
@@ -0,0 +1,104 @@
+/***************************************************************************
+ * Copyright (C) 2022 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 *
+ ***************************************************************************/
+
+#include
+#include
+#include
+#include
+#include
+#include "W25Qx.h"
+#include "usb_vcom.h"
+
+#define SOH (0x01) /* start of 128-byte data packet */
+#define STX (0x02) /* start of 1024-byte data packet */
+#define EOT (0x04) /* End Of Transmission */
+#define ACK (0x06) /* ACKnowledge, receive OK */
+#define NAK (0x15) /* Negative ACKnowledge, receiver ERROR, retry */
+#define CAN (0x18) /* two CAN in succession will abort transfer */
+#define CRC (0x43) /* 'C' == 0x43, request 16-bit CRC, use in place of first NAK for CRC mode */
+#define ABT1 (0x41) /* 'A' == 0x41, assume try abort by user typing */
+#define ABT2 (0x61) /* 'a' == 0x61, assume try abort by user typing */
+
+static const size_t FLASH_SIZE = 16*1024*1024; /* 16MB */
+uint8_t blockData[1024];
+
+int main()
+{
+ platform_init();
+ W25Qx_init();
+ W25Qx_wakeup();
+
+ uint8_t cmd = 0;
+ while(cmd != 'C')
+ {
+ platform_ledOn(GREEN);
+ sleepFor(0,50);
+ platform_ledOff(GREEN);
+ sleepFor(0,50);
+ vcom_readBlock(&cmd, 1);
+ }
+
+
+ uint8_t block = 1;
+ for(size_t addr = 0; addr < FLASH_SIZE; )
+ {
+ W25Qx_readData(addr, blockData, 1024);
+
+ bool ok = false;
+ do
+ {
+ xmodem_sendPacket(blockData, 1024, block);
+
+ cmd = 0;
+ while((cmd != ACK) && (cmd != NAK))
+ {
+ platform_ledOn(RED);
+ sleepFor(0,50);
+ platform_ledOff(RED);
+ sleepFor(0,50);
+ vcom_readBlock(&cmd, 1);
+
+ if(cmd == ACK) ok = true;
+ }
+ }
+ while(ok == false);
+
+ block++;
+ if(block == 255) block = 1;
+ addr += 1024;
+ }
+
+ cmd = EOT;
+ vcom_writeBlock(&cmd, 1);
+ while(cmd != ACK)
+ {
+ vcom_readBlock(&cmd, 1);
+ }
+
+ while(1)
+ {
+ platform_ledOn(GREEN);
+ sleepFor(1,0);
+ platform_ledOff(GREEN);
+ sleepFor(1,0);
+ }
+
+ return 0;
+}