Ubuntu Manpage: stm32flash - flashing utility for STM32 through UART or I2C

name
synopsis
description
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bootloader gpio sequence
examples
format conversion
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see also
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NAME

       stm32flash - flashing utility for STM32 through UART or I2C

SYNOPSIS

       stm32flash [-cfhjkouvCR] [-a bus_address] [-b baud_rate] [-m serial_mode] [-r filename] [-w filename] [-e
       num] [-n count] [-g  address]  [-s  start_page]  [-S  address[:length]]  [-F  RX_length[:TX_length]]  [-i
       GPIO_string] [tty_device | i2c_device]

DESCRIPTION

       stm32flash reads or writes the flash memory of STM32.

       It  requires  the  STM32  to  embed  a  bootloader  compliant  with ST application note AN3155 or AN4221.
       stm32flash uses the serial port tty_device or the i2c port i2c_device to interact with the bootloader  of
       STM32.

OPTIONS

-a bus_address
Specify address on bus for i2c_device. This option is mandatory for I2C interface.

-b baud_rate
Specify baud rate speed of tty_device. Please notice that the ST bootloader can automatically
detect the baud rate, as explained in chapter 2 of AN3155. This option could be required together
with option -c or if following interaction with bootloader is expected. Default is 57600.

-m mode
Specify the format of UART data. mode is a three characters long string where each character
specifies, in this strict order, character size, parity and stop bits. The only values currently
used are 8e1 for standard STM32 bootloader and 8n1 for standard STM32W bootloader. Default is
8e1.

-r filename
Specify to read the STM32 flash and write its content in filename in raw binary format (see below
FORMAT CONVERSION).

-w filename
Specify to write the STM32 flash with the content of filename. File format can be either raw
binary or intel hex (see below FORMAT CONVERSION). The file format is automatically detected. To
by-pass format detection and force binary mode (e.g. to write an intel hex content in STM32
flash), use -f option.

-u Specify to disable write-protection from STM32 flash. The STM32 will be reset after this
operation.

-j Enable the flash read-protection.

-k Disable the flash read-protection.

-o Erase only.

-e num Specify to erase only num pages before writing the flash. Default is to erase the whole flash.
With -e 0 the flash would not be erased.

-v Specify to verify flash content after write operation.

-n count
Specify to retry failed writes up to count times. Default is 10 times.

-g address
Specify address to start execution from (0 = flash start).

-s start_page
Specify flash page offset (0 = flash start).

-S address[:length]
Specify start address and optionally length for read/write/erase/crc operations.

-F RX_length[:TX_length]
Specify the maximum frame size for the current interface. Due to STM32 bootloader protocol, host
will never handle frames bigger than 256 byte in RX or 258 byte in TX. Due to current code,
lowest limit in RX is 20 byte (to read a complete reply of command GET). Minimum limit in TX is 5
byte, required by protocol.

-f Force binary parser while reading file with -w.

-h Show help.

-c Specify to resume the existing UART connection and don't send initial INIT sequence to detect baud
rate. Baud rate must be kept the same as the existing connection. This is useful if the reset
fails.

-i GPIO_string
Specify the GPIO sequences on the host to force STM32 to enter and exit bootloader mode. GPIO can
either be real GPIO connected from host to STM32 beside the UART connection, or UART's modem
signals used as GPIO. (See below BOOTLOADER GPIO SEQUENCE for the format of GPIO_string and
further explanation).

-C Specify to compute CRC on memory content. By default the CRC is computed on the whole flash
content. Use -S to provide different memory address range.

-R Specify to reset the device at exit. This option is ignored if either -g, -j, -k or -u is also
specified.

BOOTLOADER GPIO SEQUENCE

This feature is currently available on Linux host only.

As explained in ST application note AN2606, after reset the STM32 will execute either the application
program in user flash or the bootloader, depending on the level applied at specific pins of STM32 during
reset.

STM32 bootloader is automatically activated by configuring the pins BOOT0="high" and BOOT1="low" and then
by applying a reset. Application program in user flash is activated by configuring the pin BOOT0="low"
(the level on BOOT1 is ignored) and then by applying a reset.

When GPIO from host computer are connected to either configuration and reset pins of STM32, stm32flash
can control the host GPIO to reset STM32 and to force execution of bootloader or execution of application
program.

The sequence of GPIO values to entry to and exit from bootloader mode is provided with command line
option -i GPIO_string.

The format of GPIO_string is:
GPIO_string = [entry sequence][:[exit sequence]]
sequence = [-]n[,sequence]

In the above sequences, negative numbers correspond to GPIO at "low" level; numbers without sign
correspond to GPIO at "high" level. The value "n" can either be the GPIO number on the host system or
the string "rts", "dtr" or "brk". The strings "rts" and "dtr" drive the corresponding UART's modem lines
RTS and DTR as GPIO. The string "brk" forces the UART to send a BREAK sequence on TX line; after BREAK
the UART is returned in normal "non-break" mode. Note: the string "-brk" has no effect and is ignored.

Note that the exit sequence is only executed if -R is specified. If -R is specified, but no exit
sequence, a software-triggered reset will be performed.

As example, let's suppose the following connection between host and STM32:
• host GPIO_3 connected to reset pin of STM32;
• host GPIO_4 connected to STM32 pin BOOT0;
• host GPIO_5 connected to STM32 pin BOOT1.

In this case, the sequence to enter in bootloader mode is: first put GPIO_4="high" and GPIO_5="low"; then
send reset pulse by GPIO_3="low" followed by GPIO_3="high". The corresponding string for GPIO_string is
"4,-5,-3,3".

To exit from bootloader and run the application program, the sequence is: put GPIO_4="low"; then send
reset pulse. The corresponding string for GPIO_string is "-4,-3,3".

The complete command line flag is "-R -i 4,-5,-3,3:-4,-3,3".

STM32W uses pad PA5 to select boot mode; if during reset PA5 is "low" then STM32W will enter in
bootloader mode; if PA5 is "high" it will execute the program in flash.

As example, supposing GPIO_3 connected to PA5 and GPIO_2 to STM32W's reset. The command:
stm32flash -R -i -3,-2,2:3,-2,2 /dev/ttyS0
provides:
• entry sequence: GPIO_3=low, GPIO_2=low, GPIO_2=high
• exit sequence: GPIO_3=high, GPIO_2=low, GPIO_2=high

EXAMPLES

       Get device information:
              stm32flash /dev/ttyS0

       Write with verify and then start execution:
              stm32flash -w filename -v -g 0x0 /dev/ttyS0

       Read flash to file:
              stm32flash -r filename /dev/ttyS0

       Start execution:
              stm32flash -g 0x0 /dev/ttyS0

       Specify:
       • entry sequence: RTS=low, DTR=low, DTR=high
       • exit sequence: RTS=high, DTR=low, DTR=high
              stm32flash -R -i -rts,-dtr,dtr:rts,-dtr,dtr /dev/ttyS0

FORMAT CONVERSION

       Flash images provided by ST or created with  ST  tools  are  often  in  file  format  Motorola  S-Record.
       Conversion  between  raw  binary,  intel  hex  and Motorola S-Record can be done through software package
       SRecord.

AUTHORS

       The original software package stm32flash is written by Geoffrey McRae <geoff@spacevs.com>  and  is  since
       2012 maintained by Tormod Volden <debian.tormod@gmail.com>.

       Man page and extension to STM32W and I2C are written by Antonio Borneo <borneo.antonio@gmail.com>.

       Please report any bugs at the project homepage http://stm32flash.sourceforge.net .

LICENSE

       stm32flash is distributed under GNU GENERAL PUBLIC LICENSE Version 2.  Copy of the license  is  available
       within the source code in the file gpl-2.0.txt.