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.

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575 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 ...
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1answer
265 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: ...
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1answer
35 views

Is there a way to reduce the size of an mbed-os project? [closed]

Every time I create a new mbed-os project, (mbed new ...) I end up with a 1GB folder. This seems a tad bit excessive. How can I reuse the mbed-os folder so that ...
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1answer
369 views

PG2 GPIO output on Nucleo-F767ZI doesn't function

I have made a board on which I plug the Nucleo-F767ZI microcontroller board. There is one GPIO pin that I cannot get to function as a digital output: PG2. This is ...
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1answer
128 views

Are there any ways to improve this ISR - STM32F401RE? [closed]

I am currently coding a flight controller from scratch and am currently working on the module to decode the incoming PPM signal. Keeping in mind that this is an ISR, I've limited its functionality ...
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2answers
8k views

Using Nixie Tubes

With some (very) rusty electronics knowledge I thought I'd have a crack at getting some Nixie tubes to display using my microprocessor (an mbed). It seemed so simple, but the information I can find ...
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0answers
19 views

Mbed cli speech commands on STM32F469I Discovery board example not working

I am trying to deploy the tensorflow lite speech commands example using mbed cli on the STM32F469I Discovery board as instructed in the following link: https://developer.arm.com/solutions/machine-...
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1answer
49 views

Steppers will hold position and vibrate when sent xSTP instructions but won't move at all

Edit: setting the Wait time to 0.1 causes it to make music, yay? I've managed to get the steppers to react to xSTP with this code: ...
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1answer
39 views

Help with an Mbed LCP1768 assignment

Could someone help me out and see if my code is correct please and thank you. ...
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0answers
25 views

Connect Nucleo ST-LINK to another Nulceo Board Target

I am having issues displaying serial data, when I connect a Nucleo ST-link to another Target. My Pins Connections are as follows: ST-Link -> Nucleo Board VCC -> From JP1 of ST-link to 3.3V ...
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1answer
51 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 ...
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0answers
204 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 ...
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3answers
119 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 ...
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1answer
558 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: ...
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0answers
86 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,...
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1answer
98 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: ...
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1answer
242 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: ...
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2answers
85 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).
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0answers
181 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: <...
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2answers
256 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: ...
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0answers
474 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 ...
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2answers
404 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 ...
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1answer
411 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 ...
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2answers
126 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 ...
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0answers
98 views

No connection between host PC and mbed via Ethernet

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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 ...
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1answer
55 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)?
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65 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 ...
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0answers
343 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 ...
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1answer
260 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 ...
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4answers
203 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 ...
2
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2answers
371 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 ...
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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 ...
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7answers
12k views

What's the point of DMA in embedded CPU's?

I was doing a project recently with the mbed (LPC1768), using the DAC to output various waves. I read parts of the datasheet, and it talked about how it had DMA for a lot of the peripherals. This ...
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2answers
2k 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 ...
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1answer
1k 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 ...
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0answers
64 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 ...
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1answer
57 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 ...
3
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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 ...
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0answers
58 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. ...
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0answers
466 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 ...
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0answers
72 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. ...
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1answer
42 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, ...
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2answers
230 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: ...
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2answers
82 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 ...
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1answer
476 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=...
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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/): ...
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139 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 ...
3
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1answer
423 views

PN532 not responding using SPI when issuing antenna-related command

I've bought a PN532 v1.3 breakout board, to which I communicate in SPI. I can ask it its firmware number, to which it answers D5 03 32 01 06 07 (PN532 V1.6), which ...
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3answers
36k views

SIM900 Error on AT Command AT+SAPBR=1,1

I intend to send some information through GET method to a php page using the SIM900 module. I tried the following sequence of commands with success. ...