Questions tagged [mbed]

mbed is an operating system and hardware abstraction layer for microcontrollers, developed by ARM. A large number of development boards are supported.

Filter by
Sorted by
Tagged with
1
vote
1answer
34 views

TLC59116 will not drive LEDs

Having the hardest time with this TLC59116 LED Driver IC from Texas Instruments. I have done a crazy amount of debugging and still cannot get it to drive a single LED. I have followed all the ...
1
vote
0answers
85 views

Why would an STM32 not execute its program after upload?

I am attempting to breadboard an STM32F401 using a 64-pin breakout board. I am able to both connect and upload my program successfully (via ST-LINK V2 SWD pins), but once uploaded, the program seizes ...
1
vote
3answers
104 views

Accessing structures concurrently modified by ISR

I have the the following situation: An STM32L476RG (ARM Cortex M4F @ 80MHz, 1MB Flash, 128kB RAM) parses some string data coming in over UART. The project uses mbed-os. The parsing of the data is done ...
0
votes
0answers
15 views

Does mbed TCPSocket work with LPCxpresso1769

I have a program written using mbed OS and libs, which makes use of TCPSocket. This has been tested on the popular LPC1768 board and works just fine. I’d like to move over to the LPCxpresso1769 to ...
0
votes
0answers
45 views

UIPethernet/enc28j60 mbed packet maniplulation

I am trying to create a small project with mbed and enc28j60 ethernet shield. In this project I need to modify the received packets and then resend them back. I tried to use Uipethernet library by ...
1
vote
0answers
62 views

Huge spikes and sudden offset in accelerometer data (FRDM-K64F & ADXL357)

I'm working with vibration analysis on electric motors (AC). I have a mBed FRDM-K64F with a EVAL-ADXL357 connected to it - mounted onto a motor. The device samples from the FIFO 4000 times per second,...
0
votes
1answer
78 views

Problems with mbed LPC1768 double precision

I have a motion profile generator which calculates a position 1000/sec. During the decelerating portion of the move, the following calculation is used: ...
2
votes
1answer
160 views

Mbed Cortex-m hardfault when sending data via TCP

I have a TCPSocket* object which holds a connection to a client. This object is passed to another object to send data back to the client: ...
-1
votes
2answers
81 views

Interrupting process in another thread [closed]

Will an interrupt defined in one thread interrupt any process in other threads? If not, how can this be done? Specifically, I’m using mbed OS and timer interrupts (ticker).
-1
votes
0answers
46 views

Which sector of flash to store “user configuration” bytes in? STM32F303K8

I'm working on a project in which I'd like to store about 10 "configuration" bytes somewhere in flash, as I'd like to have the same firmware run on different boards with different settings. It doesn't ...
0
votes
0answers
107 views

mbed EventQueue call

I'm trying to make an EventQueue call inside a method attached to a Ticker. The EventQueue, and context thread is declared within the class which holds the method in question. A simplified example: <...
1
vote
2answers
180 views

mbed SPI in Ticker function

I've been trying to use spi.write() in a Ticker function, but the following error is thrown out onto the serial line: ...
1
vote
0answers
220 views

STM32L0 GPIO EXTI interrupt not triggering

I'm working with an STM32L073RZ on a custom board. The board is in STOP mode and I have a pin (PB_5) configured as a rising edge interrupt. I'm using ARM Mbed OS 5.12.0 but primarily working with the ...
0
votes
0answers
21 views

Noise in DC/DC Converter QHL600300S12 (180V-425V to 12V) output

We are using a DSO TDS2022B from Tektronix to check output voltage of DC/DC Converter QHL600300S12 from XP Power and were seeing 5V peak-to-peak in the 12V output power rail. What could be the ...
0
votes
1answer
153 views

What can be the cause for the servo to jitter continuously while powered?

I'm using an HS-785HB servo (https://www.robotshop.com/media/files/pdf/hs-785hb.pdf) for my project. I'm working on the Mbed platform and it uses C++. The servo library I use is Servo.h and I'm ...
1
vote
1answer
330 views

STM32L0 Hangs on writing EEPROM

I've got an STM32L073RZ and I'm attempting to write a 4 byte value to the internal 6 KB EEPROM. I'm running MbedOS 5.11.4 but attempting to use the HAL for this. Here's the code: ...
0
votes
1answer
168 views

Using SysTick_Handler in mbed LPC1768 project

I'm trying to use SysTick_Handler in a project which uses the mbed libraries and RTOS, however on compilation, the following error is returned: ...
0
votes
0answers
74 views

No connection between host PC and mbed via Ethernet

...
2
votes
2answers
123 views

Proportional Control Balance Beam

Bit of an unorthodox question I'm sure, but I'm making a balance beam (two rotors on either end of a see saw) with proportional control, and I can't seem to get it to balance at 0. The proportional ...
1
vote
1answer
417 views

mbed OS 5 TCP Socket

I have a few question regarding mbed OS 5's new TCP API: Some background: I will have multiple mbeds linked via Ethernet to a PC. The PC, whose IP address is fixed and known by each mbed, initiates ...
7
votes
4answers
1k views

What's causing this power spike in STM32 low power mode

I'm using an STM32L073RZ on a bare board with just the CPU and decoupling caps. I'm powering the board straight from an Otii Arc and measuring current consumption. I'm running MbedOS 5.11.2. When I ...
1
vote
1answer
53 views

Does Interrupt interrupt a blocked read call

If you were to read() incoming socket data in an infinite while loop, would an interrupt with top priority still run its ISR if the read() call is blocked (i.e. no data in the buffer)?
0
votes
0answers
39 views

Programming mbed LPC1768 via ISP

I'd like to experiment programming the mbed's LPC1768 dev board (https://os.mbed.com/platforms/mbed-LPC1768/) using ISP with FlashMagic. Is this possible without requiring physical modification of ...
4
votes
0answers
273 views

Is mbed OS suitable for hard real time systems [closed]

I have been developing embedded stm applications bare metal along with ST Hal for a few years and would still consider my self a beginner as the process of learning in a bare metal environment can be ...
0
votes
1answer
163 views

Stm32L4 microcontroller doesn't wakeup from shutdown

I'm using Mbed coding on STM32L432KC nucleo board. I'm copying the code from the STM32 cube code examples to put my MCU in shutdown. See here. The code compiles fine. I just added an LED blink inside ...
1
vote
4answers
189 views

How to connect these two resistors like on the schematic?

I am trying to connect CAN to the LPC1768, like here Expect that I don't understand the picture or the meaning of "you need two 120 ohm terminating resistors at either end of the bus". Does it mean ...
0
votes
0answers
45 views

Timer interrupt priority over TCPSocket Callbacks

I have a Timer Interrupt Routine which runs periodically (1000/sec). I plan on using mbed's TCPSocket to receive incoming messages. For obvious reasons, this should not block. It is essential that ...
2
votes
1answer
894 views

I2C Scanner not working properly

First of all, please see my other question HERE as it is related (Any help with that is greatly appreciated too). If you read through my other question, you will know that I am attempting to ...
0
votes
0answers
49 views

BLE Nano I2C on P0_10

I have a project where an nRF51822 (BLE Nano v1.5) is an I2C master and communicates with an Atmega328. I have communication working over I2C just fine using various pins. However, when attempting to ...
0
votes
1answer
46 views

Interrupt during packet transfer

I'm using the mbed TCP/IP Socket library to receive incoming messages via ethernet. Currently, the incoming data is read in an infinite while(1) loop (i.e. as fast as possible). I will also be ...
2
votes
2answers
1k views

How to read data from this sensor?

I am using the MLX90393 Magnetometer IC from Melexis. More specifically, I am using the breakout board by Sparkfun. I am still a beginner when it comes to programming, and this is my first time trying ...
3
votes
4answers
1k views

What are these exposed copper rectangles for on the mbed NXP LPC1768?

Today I noticed some exposed copper rectangles on the bottom of an mbed NXP LPC1768 dev board. They don't look like they're meant for components. I think they may just be test points, but I'm curious ...
0
votes
0answers
46 views

How do I configure system clock while using MBED IDE?

Just starting to use STM32 boards with web-based MBED IDE. This IDE don't have anything like Project configuration menu like other IDEs do. So I can not understand how do I configure system clock. ...
1
vote
0answers
290 views

Can the idle state of MOSI cause issues?

I have an issue when communicating with an ADC over SPI. If I imitate the SPI protocol via bitbanging then I have no issues with communication; however, if I use the SPI hardware (I've tried Arduino ...
0
votes
0answers
66 views

SPI DAC not changing from initial value

I've written a test program which outputs 255 to the TLV5606 DAC via SPI, all which works as expected. I then tried extending the program to update the value to 512, after a 5 second delay. ...
0
votes
1answer
41 views

What is the procedure for going from discovery board to a deployable solution? [closed]

Just to clarify with some context: This voice based keyword detection requires an mbed discovery board; and I am sure some min flash size. Even for a hobby project, i.e. personal home automation, ...
0
votes
2answers
219 views

Communicating with an SPI DAC

I'm trying to interface the TLV5606 with an mbed via SPI. The connections I've made are as follows: Note: mbed is powered from same 5V supply. I modified the mbed SPI helloworld prorgam: ...
2
votes
2answers
321 views

Mbed OS efficiency

I'm planning on using the mbed in a motion control project, where certain threads need to run at a specific, high frequency. Using the mbed library, I could use Ticket to calculate the time spent ...
1
vote
2answers
70 views

Can I use this switch with pull-up inputs?

I'm currently using the mbed Application Shield on an Arduino-type board. I want to use the centre button as an input for interrupts but the internal pull-up resistors are causing me problems. While ...
0
votes
1answer
332 views

Hooking up incremental encoder to mbed

I've spent the last hour trying to get an incremental encoder working with an mbed module. Keyes KY-040 Rotary Encoder https://www.amazon.co.uk/gp/product/B079H3C98M/ref=oh_aui_detailpage_o06_s00?ie=...
0
votes
0answers
69 views

Varying performance of mbed, depending on Power Supply

I've written a very basic program (without the mbed library) to turn on all LEDs on an mbed board (https://os.mbed.com/platforms/mbed-LPC1768/): ...
0
votes
0answers
135 views

mbed Alternative to FreeRTOS's vTaskDelayUntil()

FreeRTOS's vTaskDelayUntil() function causes a thread/task to unblock at an absolute time, therefore ensuring that threads are "awakened" in consistent time intervals. Does the mbed platform offer ...
2
votes
2answers
358 views

How fast is mbed Digital Out

I need to output 8-bit integers via parallel (i.e. using 8 pins on the same port) at 1024hz. From what I can see, I have two options: 1) Write to each pin individually using DigitalOut. 2) Avoid the ...
0
votes
1answer
476 views

STM32F7 programming problems

I am trying to program an STM32F7 series MCU on a custom PCB (migrating over from a nucleo dev board) but I am having trouble connecting to the MCU. Using STM32CubeProgrammer (the new programming ...
0
votes
1answer
220 views

How do Free-RTOS and mbed OS handle ethernet?

Do Free-RTOS and mbed OS poll for incoming data to be received (or use interrupts?)? If so, is there a risk that data to be received while the processor is handling another task (e.g. running a ...
0
votes
1answer
122 views

Is mbed RTOS suitable for commercial motion control solutions

Is the mbed RTOS suitable for commercial motion control applications? Is it advisable to separate the actual motion controller from the network handler, etc (i.e. motion controller in separate MCU)? ...
-1
votes
1answer
61 views

Choosing a networking protocol [closed]

I need several mbeds to communicate with a host PC, which will issue commands to individual mbeds. What would be a suitable networking protocol to achieve this? Bear in mind, an internet connection is ...
2
votes
2answers
243 views

Measure High Dc Voltages 0-150V using a STM32F446RE MCU

Does anyone have any suggestion on how to build a circuit that can convert high Dc voltages from 0-150 V to lower voltages so that I can use my MCU to read them and display them on my 16x2 LCD?. I ...
3
votes
3answers
392 views

DAC behaviour on reset / startup LPC1768

I am programming a mbed LPC1768 for a constant current discharger. I plan to use the DAC output on the LPC1768 for setting the current in my discharge circuit. edit: The trouble i am having is ...
0
votes
2answers
518 views

24v Emergency Stop Input

What's a good way to read a 24v emergency stop signal with an mbed? The 24v signal is connected to an E-stop contactor which disconnects power to a motor when the 24v is interrupted (i.e. when e-stop ...