I'm using the SparkFun nRF52832 Breakout to use the RTC signal for a sensor pressure clock line.
Unfortunately, on the two RTC pins, there are no signals. To verify this point, I used an oscilloscope to read pins 0 and 1.
Besides, I also created a sketch on another pin to generate my own square signal close to 33.333kHz, and I saw it on the oscilloscope.
I understand according to this tutorial that I do not need to modify the hardware.
RTC-EN - Connect/Disconnect the 32.768kHz Crystal
The nRF52832 Breakout equips the chip with a 32.768kHz crystal – connected to GPIO pins 0 and 1. Unfortunately, those pins make up a quarter > of the available ADC inputs. So, if your application doesn’t require an RTC – and you need those pins to for another purpose – grab a hobby knife and cut the two traces between their pads to disconnect the crystal.
Maybe I need to init the RTC pin with a dedicated method, but which one?
Could you provide me a link to any tutorial?
Any ideas what I'm missing here? What is my misunderstanding?
Related
I'm trying to connect to stm32f401rbt6 with st-link utility.
The MCU has 6 pins connected, as on the image below.
The target is powered by a lab power supply, target GND is connected to the ST-Link GND
When I plug it to the computer, st-link utility says it can't connect.
Tried:
Update ST-Link firmware
Connect under reset is by default, tried all available methods
Checked connectivity for the pins on the image
Connected with the same ST-Link to other MCU
Desoldered the MCU and soldered another one
The issue is still remain. Please suggest what I'm doing wrong, or how to check that my MCU is alive.
I once had similiar issues and i figuered out, that decoupling capacitors were vital. After soldering this onto the pcb, it worked like a charm.
(Similar question: Stm32CubeProgrammer not connecting (no error msg) using ST-LINK V2 dongle and Lora E5 mini board)
You can try the following suggestions. Some ST devices are a lot more sensitive than others when it comes to programming. I have had some ST devices programming without issues and then using practically the same setup on other devices it just won't work.
Place a 22ohm resistor in series on the SWDIO and SWCLK lines. This link suggests only placing it on the SWDIO line but I found that I needed it on the SWCLK line as well. Typical SWD Circuit
For the ST Link Settings try using these:
Reduce the frequency from 4MHz to a lower frequency
Use SWD
Use connect under reset
Don't use an external pull-up on the NRST line.
Make sure that your programming wires between the ST-LINK and the target board are as short as is conveniently possible.
(This one I must stress as being important) Make sure that your processor's ground pins are all connected very closely together (i.e. the tracks between them are as short as possible) and that very importantly your programmer ground is also connected to the same ground pins very closely.- At high programming speeds a thin or long unbalanced (different length) ground track to the processor can cause a problem with some devices.
Whatever you are using to supply power to the processor must have a supply with a similar voltage as the ST-LINK (mine is 3V) - (although I have found that if the processor supply is 3.3V programming seems to still work most of the time.) (Remember the original ST-Link does not supply power only reads the power level.)
A dodgy programming setup can accidentally set the protection to LEVEL 2 bricking your device - so if you have been trying and not getting any further, it might be time to replace your IC.
Prior to changing / erasing a device that had been programmed to LEVEL 1, you might need to first enable the PCROP_RDP option byte. - Once enabled, you should be able to change from LEVEL 1 to LEVEL 0 that will automatically erase the device.
Some people have suggested holding the device in reset until just after pressing the erase button to enable erasing it.
I hope these suggestions help...
I am learning about ARM development on my STM32F7 Discovery Kit (w/ STM32F746NGH6 Microcontroller) and I'm trying to write a "blinky" program without using high level libraries.
Reading the documentation, I couldn't figure out which MCU pins are all those onboard LED's connected to? What is the right document to check?
Looking at the board I can see some LEDs (LD1, LD2, ...), but how can I reach them in program? I don't see them in header files and if they are controlled via GPIO pins, how to I know which ones?
In the user manual there's no mention of any LED, except in the electrical schematics (where none of the LEDs is connected directly to the MCU afaik- they serve mostly as hard-wired board status indicators).
Is it possible that an advanced board like this doesn't have a single general purpose LED on it?
From the schematic in that document, it looks like you should be able to use LED LD1 on PI1 (GPIO port I pin 1).
Download the STM32CubeF7 software package. It should include a blinky program example specifically for your board. Then see which LED/pin they use in the example program.
I'm working with an Atmel ATMEGA328P microprocessor that is writing debug information out the MOSI SPI pin. Is there a way to wire a connection to a Windows computer so I can see the debug information?
Ideally, there would be a breakout board or something that can be purchased that would allow me to run wires from the microcontroller's SPI ports to the board and then the board would have a USB connection so I can connect to my computer. I've searched and nothing is coming up, but maybe I'm not using the right terms.
If a connection is possible, any references to code or an existing program for reading this data would really help.
By the way, the USART pins are already being used by the microcontroller for communicating with another device, otherwise I would've used them with a FT232R breakout board.
You need an SPI adapter. SparkFun has a cheap one for sale. If you have an Arduino or another Atmega328 lying around you can set it up as SPI host and use it as a SPI-USB adapter.
I have an Arduino Pro Mini and a USB cable with just wires from one side. Is it possible to connect these wires directly with Arduino? I mean, +Data to Rx, -Data to Tx, +5v to one of the numbered pins and ground to GND.
No, in fact you could damage your Arduino doing this.
The RX and TX pins are for Serial (which run at higher voltages than 5volts)
Your best option would be to buy a USB to Serial convetor and then use a MAX232 chip (it is a chip that converts TTL logic (5volts) to RS232 (3 to -25 volts).
Or you could try using the v-usb library. Google v-usb online.
Hope this helps.
Yes, but not as you think, there is a raw voltage and regulated voltage but why run the risk of wiring incorrectly.
The best is use USB device between FTDI.
Here is a simple pin connection to make programming easier in photos. (quality of photos may not be best but you get the idea from them) I don't show how I add the blue to the pins but that is shrink tubing heated.
This makes easier programming of your Arduino this can be attached to a programmer quickly and effectively.
You can get this from Sparkfun for very cheap FTDI
I am planning on doing a small arduino project and would like to know if what I'm thinking would work with a regular arduino board. I'm thinking of buying an Arduino Uno for my project, along with an IR LED and an IR sensor. So here's what I want to go with this:
I want to point the LED towards the sensor, so that the sensor is always detecting light. Then', I'll start "cutting" that light (say, with with my hand) several times. I want the arduino program to time the intervals between the times the light is "cut" and send these times to my computer via USB, so I can process this data.
I've seen many people talk about serial communication between an arduino board and a computer, but I'm not sure how that works. Will it use the same usb connector I use to upload programs to the board, or do I have to buy anything else?
EDIT: tl;dr: I guess my question, in the end, is twofold:
1) Am I able to "talk" to my computer using the built-in USB connector on the board, or is that used solely for uploading programs and I need to buy another one? and
2) Is this project feasible with an Arduino Uno board?
Thanks for the help!
Yes, your project is very feasible.
You use the built in USB connector to both program the device and communicate with it. Check out some examples on the Serial Reference Page
For reading the sensor, you'll want to use either a digital or analog input. For a digital input, you'll likely have to external components to control the light threshold, but it will provide a simple yes or no if something is in front of it. With an analog input, you can use a threshold in code to determine when your hand passes.
Timing can either be done on device with the Millis() function or on the connected computer.