Start implementing ch-flash.

This is a program forked from isp55e0, but with the ability to wait for
the device to be plugged in before flashing.

I will perhaps add other fetaures to the program which will work better
with my workflow, but this is the big change for now.

7 files changed, 1665 insertions, 0 deletions

diff --git a/ch-flash/.clang-format b/ch-flash/.clang-format
new file mode 100644
index 0000000..567ff11
--- /dev/null
+++ b/ch-flash/.clang-format
@@ -0,0 +1,11 @@
+BasedOnStyle: Google
+IndentWidth: 2
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterFunction: true
+AllowShortFunctionsOnASingleLine: InlineOnly
+AlignAfterOpenBracket: AlwaysBreak
+BinPackArguments: false
+BinPackParameters: false
+ExperimentalAutoDetectBinPacking: false
+AllowAllParametersOfDeclarationOnNextLine: true
diff --git a/ch-flash/.gitignore b/ch-flash/.gitignore
new file mode 100644
index 0000000..ba09941
--- /dev/null
+++ b/ch-flash/.gitignore
@@ -0,0 +1,2 @@
+*.o
+ch-flash
diff --git a/ch-flash/COPYING b/ch-flash/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/ch-flash/COPYING
@@ -0,0 +1,674 @@
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+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/ch-flash/Makefile b/ch-flash/Makefile
new file mode 100644
index 0000000..ba21548
--- /dev/null
+++ b/ch-flash/Makefile
@@ -0,0 +1,5 @@
+ch-flash: ch-flash.c ch-flash.h
+	gcc -O2 -o ch-flash ch-flash.c -lusb-1.0
+
+clean:
+	rm -rf ch-flash
diff --git a/ch-flash/README.md b/ch-flash/README.md
new file mode 100644
index 0000000..6fcf010
--- /dev/null
+++ b/ch-flash/README.md
@@ -0,0 +1,15 @@
+# ch-flash
+
+A program for flashing the CH573 devices.
+
+this is a fork of [](https://github.com/frank-zago/isp55e0.git) with the notable
+difference that it will wait for the CH573 device to be connected if one is not
+connected already.
+
+This has the benefit of not needing to "race the clock" when flashing the device
+because the CH537 (or at least the ones I have) have an unstable usb interface
+and will disconnect and reset after several seconds of being connected to the
+machine.
+
+With this new utility one can run the flash program and then connect the device
+when it will be flashed.
diff --git a/ch-flash/ch-flash.c b/ch-flash/ch-flash.c
new file mode 100644
index 0000000..548487d
--- /dev/null
+++ b/ch-flash/ch-flash.c
@@ -0,0 +1,776 @@
+/*
+ * ISP-55E0 - an ISP programmer for some WinChipHead MCU families
+ * Copyright 2021 Frank Zago
+ *
+ * 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 "ch-flash.h"
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <libusb-1.0/libusb.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* Profile of supported chips */
+static const struct ch_profile profiles[] = {
+    {
+        .name = "CH549",
+        .family = 0x12,
+        .type = 0x49,
+        .code_flash_size = 61440,
+        .data_flash_size = 1024,
+        .mcu_id_len = 8,
+        .need_last_write = true,
+    },
+    {
+        .name = "CH551",
+        .family = 0x11,
+        .type = 0x51,
+        .code_flash_size = 10240,
+        .data_flash_size = 128,
+        .mcu_id_len = 4,
+    },
+    {
+        .name = "CH552",
+        .family = 0x11,
+        .type = 0x52,
+        .code_flash_size = 14336,
+        .data_flash_size = 128,
+        .mcu_id_len = 4,
+    },
+    {
+        .name = "CH554",
+        .family = 0x11,
+        .type = 0x54,
+        .code_flash_size = 14336,
+        .data_flash_size = 128,
+        .mcu_id_len = 4,
+    },
+    {
+        .name = "CH559",
+        .family = 0x11,
+        .type = 0x59,
+        .code_flash_size = 61440,
+        .data_flash_size = 1024,
+        .mcu_id_len = 4,
+    },
+    {
+        .name = "CH573",
+        .family = 0x13,
+        .type = 0x73,
+        .code_flash_size = 458752,
+        .data_flash_size = 32768,
+        .mcu_id_len = 8,
+    },
+    {
+        .name = "CH579",
+        .family = 0x13,
+        .type = 0x79,
+        .code_flash_size = 256000,
+        .data_flash_size = 2048,
+        .mcu_id_len = 8,
+        .clear_cfg_rom_read = true,
+    },
+    {
+        .name = "CH32F103",
+        .family = 0x14,
+        .type = 0x3f,
+        .code_flash_size = 65536,
+        .mcu_id_len = 8,
+        .need_remove_wp = true,
+        .need_last_write = true,
+    },
+    {
+        .name = "CH32V103",
+        .family = 0x15,
+        .type = 0x3f,
+        .code_flash_size = 65536,
+        .mcu_id_len = 8,
+        .need_remove_wp = true,
+        .need_last_write = true,
+    },
+    {
+        .name = "CH582",
+        .family = 0x16,
+        .type = 0x82,
+        .code_flash_size = 458752,
+        .data_flash_size = 32768,
+        .mcu_id_len = 8,
+    },
+    {}};
+
+static const struct option long_options[] = {
+    {"code-verify", required_argument, 0, 'c'},
+    {"debug", no_argument, 0, 'd'},
+    {"code-flash", required_argument, 0, 'f'},
+    {"help", no_argument, 0, 'h'},
+    {"data-flash", required_argument, 0, 'k'},
+    {"data-verify", required_argument, 0, 'l'},
+    {"data-dump", required_argument, 0, 'm'},
+    {0, 0, 0, 0}};
+
+static void usage(void)
+{
+  printf("ISP programmer for some WinChipHead MCUs\n");
+  printf("Options:\n");
+  printf("  --code-flash, -f    firmware to flash\n");
+  printf("  --code-verify, -c   verify existing firwmare\n");
+  printf("  --data-flash, -k    data to flash\n");
+  printf("  --data-verify, -l   verify existing data\n");
+  printf("  --data-dump, -m     dump the data flash to a file\n");
+  printf("  --debug, -d         turn debug traces on\n");
+  printf("  --help, -h          this help\n");
+}
+
+static void hexdump(const char *name, const void *data, int len)
+{
+  const uint8_t *p = data;
+  int i;
+
+  printf("Dump - %s\n", name);
+  for (i = 0; i < len; i++) {
+    if (i && (i % 16) == 0) printf("\n");
+
+    printf("%02x ", *p++);
+  }
+  printf("\n");
+}
+
+/* Open and claim the USB device */
+static void open_usb_device(struct device *dev)
+{
+  int ret;
+
+  libusb_context *ctx;
+  ret = libusb_init(&ctx);
+  if (ret) errx(EXIT_FAILURE, "Can't initialize USB");
+
+  printf("Opening device with vid and pid\n");
+
+  do {
+    dev->usb_h = libusb_open_device_with_vid_pid(NULL, 0x4348, 0x55e0);
+    if (dev->usb_h != NULL) {
+      break;
+    }
+    fprintf(stderr, "Waiting for CH5xx device in ISP Mode ...\n");
+    libusb_handle_events(ctx);
+  } while (1);
+
+  printf("Detaching from kernel\n");
+  ret = libusb_set_auto_detach_kernel_driver(dev->usb_h, 1);
+  if (ret) errx(EXIT_FAILURE, "Can't detach the device from the kernel");
+
+  ret = libusb_claim_interface(dev->usb_h, 0);
+  if (ret) errx(EXIT_FAILURE, "Can't claim the USB device\n");
+}
+
+/* Send a request, get a reply */
+static int transfer(
+    struct device *dev, void *req, int req_len, void *resp, int resp_len)
+{
+  int len;
+  int ret;
+
+  ret =
+      libusb_bulk_transfer(dev->usb_h, EP_OUT, req, req_len, &len, USB_TIMEOUT);
+  if (ret) return -EIO;
+
+  if (dev->debug) hexdump("request", req, len);
+
+  ret = libusb_bulk_transfer(
+      dev->usb_h, EP_IN, resp, resp_len, &len, USB_TIMEOUT);
+  if (ret) return -EIO;
+
+  if (dev->debug) hexdump("response", resp, len);
+
+  return 0;
+}
+
+static void set_chip_profile(struct device *dev, uint8_t family, uint8_t type)
+{
+  const struct ch_profile *profile = profiles;
+
+  while (profile->name) {
+    if (profile->family == family && profile->type == type) {
+      dev->profile = profile;
+      dev->fw.max_flash_size = profile->code_flash_size;
+      dev->data.max_flash_size = profile->data_flash_size;
+      dev->data_dump.max_flash_size = profile->data_flash_size;
+      return;
+    }
+
+    profile++;
+  }
+
+  errx(
+      EXIT_FAILURE,
+      "Device family 0x%02x type 0x%02x is not supported\n",
+      family,
+      type);
+}
+
+static void read_chip_type(struct device *dev)
+{
+  struct req_get_chip_type req = {
+      .hdr.command = CMD_CHIP_TYPE,
+      .hdr.data_len = sizeof(req) - sizeof(req.hdr),
+      .string = "MCU ISP & WCH.CN",
+  };
+  struct resp_chip_type resp;
+  int ret;
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't get the device type");
+
+  if (resp.family == 0)
+    errx(EXIT_FAILURE, "Chip is hosed. Reset or power cycle it.");
+
+  set_chip_profile(dev, resp.family, resp.type);
+}
+
+static void read_config(struct device *dev)
+{
+  struct req_read_config req = {
+      .hdr.command = CMD_READ_CONFIG,
+      .hdr.data_len = sizeof(req) - sizeof(req.hdr),
+      .what = 0x1f,
+  };
+  struct resp_read_config resp;
+  int ret;
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't get the device configuration");
+
+  dev->bv = be32toh(resp.bootloader_version);
+  memcpy(dev->id, resp.id, dev->profile->mcu_id_len);
+  memcpy(dev->config_data, resp.config_data, sizeof(dev->config_data));
+}
+
+/* Write some configuration. Hardcoded for now. */
+static void write_config(struct device *dev)
+{
+  struct req_write_config req = {
+      .hdr.command = CMD_WRITE_CONFIG,
+      .hdr.data_len = sizeof(req) - sizeof(req.hdr),
+      .what = 0x07,
+  };
+  struct resp_write_config resp;
+  int ret;
+
+  memcpy(req.config_data, dev->config_data, sizeof(req.config_data));
+
+  if (dev->profile->need_remove_wp && req.config_data[0] == 0xff)
+    req.config_data[0] = 0xa5;
+
+  if (dev->profile->clear_cfg_rom_read) {
+    /* CH579 - the CFG_ROM_READ must be cleared, otherwise
+     * flashing will fail.
+     */
+    req.config_data[8] &= ~0x80;
+  }
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't write the new configuration");
+}
+
+/* Erase the flash */
+static void erase_code_flash(struct device *dev)
+{
+  struct req_erase_flash req = {
+      .hdr.command = CMD_ERASE_CODE_FLASH,
+      .hdr.data_len = sizeof(req) - sizeof(req.hdr),
+  };
+  struct resp_erase_flash resp;
+  int length;
+  int ret;
+
+  /* Erase length is in KiB blocks, with a minimum of 8KiB */
+  length = ((dev->fw.len + 1023) & ~1023) / 1024;
+  if (length < 8) length = 8;
+
+  req.length = length;
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't erase the code flash");
+
+  if (resp.return_code != 0x00)
+    errx(EXIT_FAILURE, "The device refused to erase the code flash");
+}
+
+static void load_file(struct device *dev, struct content *info)
+{
+  struct stat statbuf;
+  int ret;
+  int fd;
+
+  fd = open(info->filename, O_RDONLY);
+  if (fd == -1) err(EXIT_FAILURE, "Can't open the firmware file");
+
+  ret = fstat(fd, &statbuf);
+  if (ret == -1) err(EXIT_FAILURE, "Can't get firmware file size");
+
+  /* Round up to 8 bytes boundary as upload protocol requires
+   * it. Extra bytes are zeroes. */
+  info->len = (statbuf.st_size + 7) & ~7;
+
+  if (info->len > info->max_flash_size)
+    errx(EXIT_FAILURE, "Firmware cannot fit in flash");
+
+  info->buf = malloc(info->len);
+  if (info->buf == NULL)
+    errx(EXIT_FAILURE, "Can't allocate %zd bytes for the firmware", info->len);
+
+  memset(info->buf, 0xff, info->len);
+
+  /* TODO: loop until all read, or use mmap instead. */
+  ret = read(fd, info->buf, statbuf.st_size);
+  if (ret != statbuf.st_size) err(EXIT_FAILURE, "Can't read firmware file");
+
+  close(fd);
+}
+
+/* Encrypt (or decrypt) some data */
+static void encrypt(const struct device *dev, struct content *info)
+{
+  uint8_t *p;
+  int i;
+
+  p = info->buf;
+  for (i = 0; i < info->len; i++) {
+    *p++ ^= dev->xor_key[i % XOR_KEY_LEN];
+  }
+
+  info->encrypted = !info->encrypted;
+}
+
+/* Create the local key to encrypt the data to send */
+static void create_key(struct device *dev)
+{
+  uint8_t sum;
+  int i;
+
+  sum = 0;
+  for (i = 0; i < dev->profile->mcu_id_len; i++) sum += dev->id[i];
+
+  for (i = 0; i < XOR_KEY_LEN; i++) dev->xor_key[i] = sum;
+  dev->xor_key[7] += dev->profile->type;
+}
+
+/* Send the encryption key */
+static void send_key(struct device *dev)
+{
+  static struct req_set_key req = {
+      .hdr.command = CMD_SET_KEY,
+      .hdr.data_len = 0x1e,
+  };
+  struct resp_set_key resp;
+  int ret;
+  uint8_t sum;
+  int i;
+
+  sum = 0;
+  for (i = 0; i < XOR_KEY_LEN; i++) sum += dev->xor_key[i];
+
+  ret = transfer(
+      dev,
+      &req,
+      sizeof(struct req_hdr) + req.hdr.data_len,
+      &resp,
+      sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't set the key");
+
+  if (resp.key_checksum != sum)
+    errx(EXIT_FAILURE, "The device refused the key");
+}
+
+/* read or write code flash, or write data flash */
+static int flash_rw(
+    struct device *dev, int cmd, struct content *info, int *offset_out)
+{
+  struct req_flash_rw req = {
+      .hdr.command = cmd,
+  };
+  struct resp_flash_rw resp;
+  int offset;
+  int to_send;
+  int len;
+  int ret;
+
+  /* Send the firmware in 56 bytes chunks */
+  offset = 0;
+  to_send = info->len;
+  while (to_send) {
+    req.offset = offset;
+
+    len = sizeof(req.data);
+    if (len > to_send) len = to_send;
+
+    req.hdr.data_len = len + 5;
+
+    memcpy(&req.data, &info->buf[offset], len);
+
+    ret = transfer(
+        dev,
+        &req,
+        sizeof(struct req_hdr) + req.hdr.data_len,
+        &resp,
+        sizeof(resp));
+    if (ret) errx(EXIT_FAILURE, "Write failure at offset %d", offset);
+
+    if (resp.return_code != 0) {
+      *offset_out = offset;
+      return resp.return_code;
+    }
+
+    to_send -= len;
+    offset += len;
+  }
+
+  if (cmd == CMD_WRITE_CODE_FLASH && dev->profile->need_last_write) {
+    /* The CH32Fx need a last empty write. */
+    req.offset = info->len;
+    req.hdr.data_len = 5;
+
+    ret = transfer(
+        dev,
+        &req,
+        sizeof(struct req_hdr) + req.hdr.data_len,
+        &resp,
+        sizeof(resp));
+    if (ret) errx(EXIT_FAILURE, "Write failure at offset %d", offset);
+
+    if (resp.return_code != 0) {
+      *offset_out = offset;
+      return resp.return_code;
+    }
+  }
+
+  return 0;
+}
+
+static void write_code_flash(struct device *dev)
+{
+  int offset;
+  int ret;
+
+  ret = flash_rw(dev, CMD_WRITE_CODE_FLASH, &dev->fw, &offset);
+  if (ret) errx(EXIT_FAILURE, "Write code flash failure at offset %d", offset);
+}
+
+static void verify_code_flash(struct device *dev)
+{
+  int offset;
+  int ret;
+
+  ret = flash_rw(dev, CMD_CMP_CODE_FLASH, &dev->fw, &offset);
+  if (ret) errx(EXIT_FAILURE, "Check code flash failure at offset %d", offset);
+}
+
+static void erase_data_flash(struct device *dev)
+{
+  struct req_erase_data_flash req = {
+      .hdr.command = CMD_ERASE_DATA_FLASH,
+  };
+  struct resp_erase_data_flash resp;
+  size_t length;
+  int ret;
+
+  /* Erase length is in KiB blocks, with a minimum of 1KiB */
+  length = ((dev->profile->data_flash_size + 1023) & ~1023) / 1024;
+  if (length < 1) length = 1;
+
+  req.len = length;
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+  if (ret) errx(EXIT_FAILURE, "Can't erase the data flash");
+
+  if (resp.return_code != 0x00)
+    errx(EXIT_FAILURE, "The device refused to erase the data flash");
+}
+
+static void write_data_flash(struct device *dev)
+{
+  int ret;
+  int offset;
+
+  ret = flash_rw(dev, CMD_WRITE_DATA_FLASH, &dev->data, &offset);
+  if (ret) errx(EXIT_FAILURE, "Write data flash failure at offset %d", offset);
+}
+
+static void read_data_flash(struct device *dev)
+{
+  struct req_read_data_flash req = {
+      .hdr.command = CMD_READ_DATA_FLASH,
+  };
+  struct resp_read_data_flash resp;
+  int to_read;
+  int offset;
+  int len;
+  int ret;
+
+  to_read = dev->data_dump.max_flash_size;
+
+  dev->data_dump.len = to_read;
+  dev->data_dump.buf = calloc(1, to_read);
+  if (!dev->data_dump.buf)
+    errx(EXIT_FAILURE, "Can't allocate %u bytes for the data flash", to_read);
+
+  offset = 0;
+
+  while (to_read) {
+    req.offset = offset;
+
+    len = sizeof(resp.data);
+    if (len > to_read) len = to_read;
+
+    req.len = len;
+
+    ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+    if (ret) errx(EXIT_FAILURE, "Data read failure at offset %d", offset);
+
+    if (resp.return_code != 0)
+      errx(EXIT_FAILURE, "Data read failure at offset %d", offset);
+
+    memcpy(&dev->data_dump.buf[offset], resp.data, len);
+
+    to_read -= len;
+    offset += len;
+  }
+}
+
+static void verify_data_flash(struct device *dev)
+{
+  if (dev->data.encrypted) {
+    /* The data was just written previously to the flash,
+     * and encrypted. It needs to been decrypted now so
+     * the comparison can happen. */
+    encrypt(dev, &dev->data);
+  }
+
+  if (memcmp(dev->data.buf, dev->data_dump.buf, dev->data.len) != 0)
+    errx(EXIT_FAILURE, "Data flash doesn't match");
+}
+
+static void dump_data_flash(struct device *dev)
+{
+  int fd;
+  int ret;
+
+  fd = creat(dev->data_dump.filename, 0600);
+  if (fd == -1)
+    err(EXIT_FAILURE, "Can't create the file to dump the data flash");
+
+  ret = write(fd, dev->data_dump.buf, dev->data.max_flash_size);
+  if (ret == -1) err(EXIT_FAILURE, "Can't dump the data flash");
+
+  if (ret != dev->profile->data_flash_size)
+    err(EXIT_FAILURE, "Can't dump all the data flash to file");
+
+  close(fd);
+}
+
+/* Reboot the device */
+static void reboot_device(struct device *dev)
+{
+  struct req_reboot req = {
+      .hdr.command = CMD_REBOOT,
+      .hdr.data_len = sizeof(req) - sizeof(req.hdr),
+      .option = 0x01,
+  };
+  struct resp_reboot resp;
+  int ret;
+
+  ret = transfer(dev, &req, sizeof(req), &resp, sizeof(resp));
+
+  /* 2.4.0 bootloaders do not respond. 2.8.0 does. */
+  if (!dev->wait_reboot_resp) return;
+
+  if (ret) errx(EXIT_FAILURE, "Can't reboot the device");
+
+  if (resp.return_code != 0x00)
+    errx(EXIT_FAILURE, "The device refused to reboot");
+}
+
+int main(int argc, char *argv[])
+{
+  struct device dev = {};
+  bool do_code_flash = false;
+  bool do_code_verify = false;
+  bool do_data_flash = false;
+  bool do_data_verify = false;
+  bool do_data_dump = false;
+  int c;
+  int i;
+
+  while (1) {
+    int option_index = 0;
+
+    c = getopt_long(argc, argv, "c:df:hk:l:m:", long_options, &option_index);
+    if (c == -1) break;
+
+    switch (c) {
+      case 0:
+        printf("option %s", long_options[option_index].name);
+        if (optarg) printf(" with arg %s", optarg);
+        printf("\n");
+        break;
+      case 'c':
+        dev.fw.filename = optarg;
+        do_code_verify = true;
+        break;
+      case 'd':
+        dev.debug = true;
+        break;
+      case 'f':
+        dev.fw.filename = optarg;
+        do_code_flash = true;
+        do_code_verify = true; /* always verify after flashing */
+        break;
+      case 'k':
+        dev.data.filename = optarg;
+        do_data_flash = true;
+        do_data_verify = true;
+        break;
+      case 'l':
+        dev.data.filename = optarg;
+        do_data_verify = true;
+        break;
+      case 'm':
+        dev.data_dump.filename = optarg;
+        do_data_dump = true;
+        break;
+      case 'h':
+        usage();
+        return EXIT_SUCCESS;
+      default:
+        return EXIT_FAILURE;
+    }
+  }
+
+  if (optind < argc) errx(EXIT_FAILURE, "Extra argument: %s", argv[optind]);
+
+  printf("Opening USB Device\n");
+  open_usb_device(&dev);
+  printf("Reading device.\n");
+  read_chip_type(&dev);
+  printf("Found device %s\n", dev.profile->name);
+
+  read_config(&dev);
+
+  printf(
+      "Bootloader version %d.%d.%d\n",
+      (dev.bv >> 16) & 0xff,
+      (dev.bv >> 8) & 0xff,
+      dev.bv & 0xff);
+
+  printf("Unique chip ID ");
+  for (i = 0; i < dev.profile->mcu_id_len; i++) {
+    if (i > 0) printf("-");
+    printf("%02x", dev.id[i]);
+  }
+  printf("\n");
+
+  /* check bootloader version */
+  switch (dev.bv) {
+    case 0x020301:
+    case 0x020400:
+      dev.wait_reboot_resp = false;
+      break;
+
+    case 0x020500:
+    case 0x020600:
+    case 0x020800:
+    case 0x020900:
+      dev.wait_reboot_resp = true;
+      break;
+
+    default:
+      errx(EXIT_FAILURE, "This bootloader version is not supported");
+  }
+
+  create_key(&dev);
+
+  if (do_code_flash || do_code_verify) {
+    load_file(&dev, &dev.fw);
+    encrypt(&dev, &dev.fw);
+  }
+
+  if (do_data_flash || do_data_verify) load_file(&dev, &dev.data);
+
+  if (do_code_flash || do_code_verify || do_data_flash) send_key(&dev);
+
+  /* Code flash */
+
+  if (do_code_flash) {
+    write_config(&dev);
+
+    erase_code_flash(&dev);
+    write_code_flash(&dev);
+
+    printf("Code flashing successful\n");
+  }
+
+  if (do_code_verify) {
+    verify_code_flash(&dev);
+
+    printf("Firmware is good\n");
+  }
+
+  /* Data flash */
+
+  if (do_data_flash) {
+    encrypt(&dev, &dev.data);
+    erase_data_flash(&dev);
+    write_data_flash(&dev);
+
+    printf("Data flashing successful\n");
+  }
+
+  if (do_data_verify || do_data_dump) read_data_flash(&dev);
+
+  if (do_data_verify) {
+    verify_data_flash(&dev);
+
+    printf("Data flash is good\n");
+  }
+
+  if (do_data_dump) {
+    dump_data_flash(&dev);
+
+    printf("Dumped data flash to file\n");
+  }
+
+  if (do_code_flash) reboot_device(&dev);
+
+  return 0;
+}
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-file-style: "linux"
+ * indent-tabs-mode: t
+ * tab-width: 8
+ * End:
+ */
diff --git a/ch-flash/ch-flash.h b/ch-flash/ch-flash.h
new file mode 100644
index 0000000..331dc3e
--- /dev/null
+++ b/ch-flash/ch-flash.h
@@ -0,0 +1,182 @@
+/* Endpoints to use */
+#define EP_OUT 0x02
+#define EP_IN 0x82
+
+#define XOR_KEY_LEN 8
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <libusb-1.0/libusb.h>
+
+/* Profile of a specific CH device */
+struct ch_profile {
+	const char *name;
+
+	uint8_t type;		/* CH554 -> 0x54, ... */
+	uint8_t family;		/* CH55x-> 0x11, CH57x -> 0x13, ...*/
+
+	int mcu_id_len;		/* Number of bytes in the unique ID */
+
+	int code_flash_size;
+	int data_flash_size;
+
+	bool need_remove_wp;	/* remove CH32 write protect */
+	bool need_last_write;	/* chip needs an empty write */
+	bool clear_cfg_rom_read; /* Flashing will fail if this bit is set */
+};
+
+/* Content of either a file or one of the flash section */
+struct content {
+	char *filename;
+	bool encrypted;	/* whether the data in buf has been encrypted */
+	size_t len;
+	size_t max_flash_size;
+	uint8_t *buf;
+};
+
+/* Current device */
+struct device {
+	const struct ch_profile *profile;
+	bool debug;
+	struct content fw;
+	struct content data;	/* read data from */
+	struct content data_dump; /* write the data flash into */
+	libusb_device_handle *usb_h;
+	uint32_t bv;		/* bootloader version */
+	uint8_t id[8];
+	uint8_t config_data[12];
+	uint8_t xor_key[XOR_KEY_LEN];
+	bool wait_reboot_resp;	/* wait for reboot command response */
+};
+
+/* Enough to erase the flash. */
+#define USB_TIMEOUT 5000
+
+#define CMD_CHIP_TYPE        0xa1
+#define CMD_REBOOT           0xa2
+#define CMD_SET_KEY          0xa3
+#define CMD_ERASE_CODE_FLASH 0xa4
+#define CMD_WRITE_CODE_FLASH 0xa5
+#define CMD_CMP_CODE_FLASH   0xa6
+#define CMD_READ_CONFIG      0xa7
+#define CMD_WRITE_CONFIG     0xa8
+#define CMD_ERASE_DATA_FLASH 0xa9
+#define CMD_WRITE_DATA_FLASH 0xaa
+#define CMD_READ_DATA_FLASH  0xab
+
+struct req_hdr {
+	uint8_t command;
+	uint16_t data_len;	/* Number of bytes after the header */
+} __attribute__((__packed__));
+
+struct resp_hdr {
+	uint8_t command;
+	uint8_t _u0;
+	uint8_t data_len;	/* Number of bytes after the header */
+	uint8_t _u1;		/* possibly part of the length */
+} __attribute__((__packed__));
+
+struct req_get_chip_type {
+	struct req_hdr hdr;
+	uint8_t type;		/* CH554 -> 0x54, ... */
+	uint8_t family;		/* CH55x-> 0x11, CH57x -> 0x13, ...*/
+	uint8_t string[16];	/* "MCU ISP & WCH.CN" */
+} __attribute__((__packed__));
+
+struct resp_chip_type {
+	struct resp_hdr hdr;
+	uint8_t type;		/* CH554 -> 0x54, ... */
+	uint8_t family;		/* CH55x-> 0x11, CH57x -> 0x13, ...*/
+} __attribute__((__packed__));
+
+struct req_read_config {
+	struct req_hdr hdr;
+	uint16_t what;		/* bitfield of config types? */
+} __attribute__((__packed__));
+
+struct resp_read_config {
+	struct resp_hdr hdr;
+	uint16_t what;		/* same as command */
+	uint8_t config_data[12];	/* various configuration bits */
+	uint32_t bootloader_version; /* in big endian */
+	uint8_t id[7];		/* chip unique ID */
+	uint8_t id_checksum;
+} __attribute__((__packed__));
+
+struct req_write_config {
+	struct req_hdr hdr;
+	uint16_t what;		/* bitfield of config types? */
+	uint8_t config_data[12];
+} __attribute__((__packed__));
+
+struct resp_write_config {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+} __attribute__((__packed__));
+
+struct req_set_key {
+	struct req_hdr hdr;
+	uint8_t data[64];	/* obfuscated crap */
+} __attribute__((__packed__));
+
+struct resp_set_key {
+	struct resp_hdr hdr;
+	uint16_t key_checksum;
+} __attribute__((__packed__));
+
+struct req_erase_flash {
+	struct req_hdr hdr;
+	uint16_t length;	/* size in KiB, possibly just 1 byte to code it. */
+	uint16_t _u1;
+} __attribute__((__packed__));
+
+struct resp_erase_flash {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+} __attribute__((__packed__));
+
+struct req_flash_rw {
+	struct req_hdr hdr;
+	uint32_t offset;	/* ROM offset */
+	uint8_t _u1;		/* some checksum? */
+	uint8_t data[56];
+} __attribute__((__packed__));
+
+struct resp_flash_rw {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+} __attribute__((__packed__));
+
+struct req_reboot {
+	struct req_hdr hdr;
+	uint8_t option;
+} __attribute__((__packed__));
+
+struct resp_reboot {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+} __attribute__((__packed__));
+
+struct req_erase_data_flash {
+	struct req_hdr hdr;
+	uint32_t _u1;
+	uint8_t len;		/* length in KB? */
+} __attribute__((__packed__));
+
+struct resp_erase_data_flash {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+} __attribute__((__packed__));
+
+struct req_read_data_flash {
+	struct req_hdr hdr;
+	uint32_t offset;	/* Data offset */
+	uint16_t len;
+} __attribute__((__packed__));
+
+struct resp_read_data_flash {
+	struct resp_hdr hdr;
+	uint16_t return_code;
+	uint8_t data[58];
+} __attribute__((__packed__));