svd-tools Repository

This repository groups a set of tools using svd features.

SVD: System View Description:

The CMSIS System View Description format(CMSIS-SVD) formalizes the description of the system contained in Arm Cortex-M processor-based microcontrollers, in particular, the memory mapped registers of peripherals. The detail contained in system view descriptions is comparable to the data in device reference manuals. The information ranges from high level functional descriptions of a peripheral all the way down to the definition and purpose of an individual bit field in a memory mapped register.

gdb-svd

It's a python module for gdb. This adds some gdb commands to:

• get information on peripherals | registers | fields
• get registers values | register fields
• set registers values | register fields
• dump registers values to file

Dependencies

• openocd or other
• gdb
• cmsis-svd python: cmsis-svd parser
• terminaltables python: terminaltables

On microprocessor: I advise to use openocd, in order to access at physical memory without need to enable/disable MMU (thanks to openocd with mdw phys option).

How to use

These commands support tab completion to look-up file, peripherals, registers or fields

• Source the gdb-svd module in gdb interface:

(gdb) source ../svd_tools/gdb-svd.py

• Load svd file descriptor for your microcontroller (it might several seconds depending on the file size):

(gdb) svd ../cmsis-svd/data/STMicro/STM32F7x9.svd
Svd Loading ../cmsis-svd/data/STMicro/STM32F7x9.svd Done

• Help:

(gdb) help svd
The CMSIS SVD (System View Description) inspector commands
        This allows easy access to all peripheral registers supported by the system
        in the GDB debug environment

        svd [filename] load an SVD file and to create the command for inspecting
        that object

List of svd subcommands:
svd dump -- Get register(s) value(s): svd dump <filename> [peripheral]
svd get -- Get register(s) value(s): svd get [peripheral] [register]
svd info -- Info on Peripheral|register|field: svd info <peripheral> [register] [field]
svd set -- Set register value: svd set <peripheral> <register> [field] <value>

Info on peripheral register field

Note: The last parameter can be or not a fullname, a filter is applied with your string.

• Information on all ADC

(gdb) svd info ADC
+Peripherals--------+--------+-----------------------------+
| name | base       | access | description                 |
+------+------------+--------+-----------------------------+
| ADC1 | 0x40012000 | None   | Analog-to-digital converter |
| ADC2 | 0x40012100 | None   | Analog-to-digital converter |
| ADC3 | 0x40012200 | None   | Analog-to-digital converter |
+------+------------+--------+-----------------------------+

• Information on all ADC1 registers beginning by S

(gdb) svd info ADC1 S
+Registers-----------+------------+-----------------------------+
| name  | address    | access     | description                 |
+-------+------------+------------+-----------------------------+
| SR    | 0x40012000 | read-write | status register             |
| SMPR1 | 0x4001200c | read-write | sample time register 1      |
| SMPR2 | 0x40012010 | read-write | sample time register 2      |
| SQR1  | 0x4001202c | read-write | regular sequence register 1 |
| SQR2  | 0x40012030 | read-write | regular sequence register 2 |
| SQR3  | 0x40012034 | read-write | regular sequence register 3 |
+-------+------------+------------+-----------------------------+

• Information on all fields (peripheral: ADC1 register: CR1) beginning by J

(gdb) svd info ADC1 CR1 J
+Fields---+-----------+--------+---------------------------------------------+
| name    | [msb:lsb] | access | description                                 |
+---------+-----------+--------+---------------------------------------------+
| JAWDEN  | [22:22]   | None   | Analog watchdog enable on injected channels |
| JDISCEN | [12:12]   | None   | Discontinuous mode on injected channels     |
| JAUTO   | [10:10]   | None   | Automatic injected group conversion         |
| JEOCIE  | [7:7]     | None   | Interrupt enable for injected channels      |
+---------+-----------+--------+---------------------------------------------+

Get value

• Get all registers of WWDG

(gdb) svd get WWDG
+Registers----------+------------+----------------------------------------------------------+
| name | address    | value      | fields                                                   |
+------+------------+------------+----------------------------------------------------------+
| CR   | 0x40002c00 | 0x0000007f | WDGA[7:7]=0x0 T[6:0]=0x7f                                |
| CFR  | 0x40002c04 | 0x0000007f | EWI[9:9]=0x0 WDGTB1[8:8]=0x0 WDGTB0[7:7]=0x0 W[6:0]=0x7f |
| SR   | 0x40002c08 | 0x00000000 | EWIF[0:0]=0x0                                            |
+------+------------+------------+----------------------------------------------------------+

• Get fields of RCC AHB3ENR

(gdb) svd get RCC AHB3ENR
+Registers+------------+------------+--------------------------------+
| name    | address    | value      | fields                         |
+---------+------------+------------+--------------------------------+
| AHB3ENR | 0x40023838 | 0x00000000 | FMCEN[0:0]=0x0 QSPIEN[1:1]=0x1 |
+---------+------------+------------+--------------------------------+

Set value

• Set register value

(gdb) svd set RCC AHB3ENR 0x0

• Set field of

(gdb) svd set RCC AHB3ENR QSPIEN 0x1

Dump value in file

• Dump value of all registers to file

(gdb) svd dump <filename>
Print to file: <filename>

• Dump value of ADC1 to file

(gdb) svd dump <filename> ADC1
Print to file: <filename>

Authors

Ludovic Barre 1udovic.6arre@gmail.com

License

This project is licensed under the GPL V2 License - see the LICENSE.md file for details