I want to reprogram the external flash of a raspberry Pico via SWD line.
This feature must be implemented in a different microcontroller, not from a Linux computer so the OpenOCD library cannot be used.
I already wrote a C library that is able to read and write in RAM and in core registers via SWD and I'm able to put the Cortex-M0+ into halt state.
I read many tutorials and documentation and those that are useful are:
http://markding.github.io/swd_programing_sram/
https://www.silabs.com/documents/public/application-notes/an0062.pdf
https://community.silabs.com/s/article/how-to-program-internal-sram-over-swd?language=en_US
but unfortunately they aren't clear enough.
Can you explain the sequence of commands that I should send to RP2040 to correctly upload the new firmware?
Thanks for your help!
Related
I am trying to learn Linux by following instructions in "Mastering Embedded Linux Programming" by Chris Simmonds. By following the book and with some help from Stack_Overflow_1, i was able to build the MLO and u-boot.img.
However, when i connect USB cable to my PC and execute the ls /dev/tty* command, i cannot find any device with /dev/ttyUSB. All i can see are devices with /dev/tty0-63, /dev/ttyS0-31 and one /dev/ttyprintk.
Also, when i press down the S2 button and connect the USB cable, i can only see the power led glowing and nothing else.
I have properly built the u-boot (three attempts to get it right).
Also, as per the instructions in the book, i am only testing the u-boot stuff and yet to reach the kernal part.
If i remove the sd card and connect the USB, im an able to talk to my BBB over ssh (192.168.7.2).
How to i get the u-boot to work? Thank you!
If you don't have one yet, I'd recommend to get a USB-to-serial device (3.3V Vref). You connect it to the debug UART (J1) which is located next to the P9 side. Nowadays those are very cheap and can cost below 1$. Ones that feature a genuine FTDI part will be 5-10$ at least.
The serial port you are referencing is only available once the device has passed through U-Boot, booted the kernel and finally userspace has set up the communications.
Especially when working with U-Boot and the Kernel, low level UART access is crucial.
As a further note, could it be that the Book refers to the (white) original Beaglebone? That has a FTDI USB-to-UART chip on board and will allow you even U-Boot access. You can do the same things if you have the above mentioned USB device.
https://groups.google.com/g/beagleboard/c/eNDjK05spY8/m/GPvhcP52BAAJ shows that one needs to hold the space key to enter u-boot.
Also, the info. here might be more up to date compared to the book.
https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black
There is no way to copy and paste everything from the eewiki. I just left you the link. Enjoy!
I successfully implemented an "[accelerator in 15 minutes]"1 on parallella board. Now I need to send an interrupt from pl to ps. So I connected it to IRQ_F2P of Zynq processing system.
Now, how can I get this interrupt in arm processor?
Usual interrupt example using "XILINX SDK" tool which uses a JTAG. But in parallella , I don't have a JTAG. (I am coping the program to SD card and execute it from SD card using Ubuntu). So any suggestions are most welcome.
So for parallella, I tried to use the Xilinx SDK, but the header files are creating an error..
My one more doubt is "Is it possible to create a bsp using sdk tool and copy it into sd card and then make it run on parallella board. Will it work ?
If not, how do we get this interrupt in arm processor, because all example uses Xilinx header files like "xparameters.h, xil_printf.h, xcugic.h, etc" and these are connected to many other Xilinx functions.
I am using arm-none-eabi toolchain to create binary file for Nucleo which I then flash to the Nucleo using the USB virtual storage device it provides.
I am compiling the program with -ggdb. But how could I possibly connect to the nucleo and execute breakpoints on it? I can't even imagine how could it work, but I'm complete beginner.
Can I connect? How?
Yes you can connect, at least from a Linux host. I never tried from Windows system. Use OpenOCD to open a debug port and connect gdb (used arm-none-eabi-gdb) to this port with "gdb extended-remote" command. I am using this method from Linux host PC to connect to a custom board based on STM32L4 series for debugging and collecting log messages. Nucleo boards are also using the same series of STM controller.
For what it's worth there's a free IDE call EMBlocks that I've used in the past. I think the new version is called EMBitz https://www.embitz.org/
I've used it to both flash the STM32 Nucleo boards as well as debug the flashed image file.
A quick search also turns up this website that seems to indicate you can use GDB with the stlink utility. https://openenergymonitor.org/emon/node/6189
I'm setting up i2c for an Application written in C, but I've not been able to find any how-to's for it. I'm running a model-b Raspberry Pi on Debian 6 with LXDE. Can anybody show me how to set up i2c so I can use it in a C Application?
Thanks for any help in advance
I've been looking for similar information and I found a couple of i2c tutorials, one in adafruit tutorials and the other in Guy Carpenter's Gaugette blog. I'm not yet at the stage of actually using it so I can't vouch for their completeness but they seem to be a good start.
Configuring Your Pi for I2C
Analog Gauges Using I²C on the Raspberry Pi
I2C Installation for Raspberry Pi. I think this is only necessary if not using AdaFruit's Occidentalis release which has it included.
try this :
C GPIO Interface library for the Raspberry Pi
It offers API for handling GPIO port on Raspberry, including dedicated functions for I2C interface. I've been using this to read measurements from temperature sensor and it works perfect (STCN75 connected to RPi rev. B).
You can find examples and instructions on author's website. Project is maintained and updated frequently on public Git repo.
I am trying to send data from a Kamstrup Multical 601 to an Arduino Uno using the M-bus protocol.
I am considering trying to use the libmbus c libraries to do this. However, I do not have a lot of experience in c programming so was wondering if:
you think this is a realistic/achievable approach?
anyone could suggest an alternative/easier approach?
The main chip on the Arduino Uno is the Atmel Atmega382P-PU.
After getting the data to the Arduino I aim to perform some calculations and send data to an LCD (this I think I can do).
On the Arduino Website there is a short how-to about the use of external C-Libraries with Arduino.
Note that you cannot simply connect M-Bus with a RS-232 interface. There is a so called "level-shifter" device necessary inbetween to do the "electrical transition". See the EN 13757-2 standard doucment for what this device is exactly doing with the signal. Without such a device you won't get any word out of your M-Bus device.
The library you link to appears to be for Linux. The Arduino, of course, doesn't run Linux so a library won't compile for it directly.
You should probably try implementing the library yourself, but using the Arduino's standard libraries to access ports and so on.