Questions tagged [c]
C is an imperative (procedural) systems implementation language. It was designed to be compiled using a relatively straightforward compiler, to provide low-level access to memory, to provide language constructs that map efficiently to machine instructions, and to require minimal run-time support. C was therefore useful for many applications that had formerly been coded in assembly language. from http://en.wikipedia.org/wiki/C_(programming_language)
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Azure NetX Duo: where can I find a driver compatible with my Ethernet PHY ADIN1200?
Context of my question
I am trying to use Azure NetX Duo with a micro STM32F4. I'm using the following tools:
STM32CubeMX version 6.7.0
In the STM32CubeMX I have installed the Package STM32F4 version ...
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Selling programmed PCBs [closed]
I want to purchase PCBs online and program them for specific purposes. I can sell the end product(like a wifi router). But i don't know how to find a client for only the programmed PCBs. Any advices?
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How do I read multiple ADC channels from a SAMD21 configured in atmel.start?
I'm stuck with trying to read multiple ADC channels on a SAMD21 that I have configured using ATMEL.start. I am very new to Microchip Studio (Arduino convert trying to upgrade).
The below code is my ...
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1
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ADC Multiple Channel without using DMA
below i give my code. here i using 2 ADC Channel and i getting first ADC channel value only. i need to read both ADC channel value.
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2
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49
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PI negative controller output scaling to unsigned duty cycle
I am trying to implement a PI controller in C that outputs / controls a PWM's duty cycle on a microcontroller. The duty cycle that I can write to the certain PWM control register is limited to 10bit (...
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60
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STM8S I2C - Stuck while generating START condition
I'm trying to make an i2c scanner (just like the arduino one) for the STM8S005K6 but I can't seem to even generate a start condition for the communication to begin.
I have to say, I've never used STM8 ...
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Understand the values of ADXL345 output by data sheet
I want to make step counter with ADXL345. I got the algorithm but I have a problem with the data sheet and the codes.
First of all, I tried the all resolutions. For example if I use 2g my z axes's ...
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1
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Is there an alternative way to open file without its path in ELM Fatfs?
I want to open file files without their path in ELM Fatfs.
I want to store a pointer or something and use that to open files or folders rather than their paths.
This will save me alot of ram in a ...
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Turning off the DEM 128064B SYH-PY display
I'm trying for warming up to turn off and on the DEM 128064B LCD based on the instructions defined in the datasheet page 12 section 10-1, but I nothing changes and the LCD is on always with all the ...
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How can I read an array of values from the ADC through a single channel on an STM32 (Nucleo F401RE)?
I am trying to work with the TCD1304DG Linear Array (CCD) sensor. I have configured the signal timings perfectly, as shown in the datasheet. Here is an image from the datasheet of the necessary ...
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Left shift confusion with microcontroller compiler
Using an STM32 uC debugger, and from binary 0111 I want to obtain 1110. And to do so, I use left shift operator as follow:
...
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How to set the SPI channel and read the measured values
I want to use the SPI of an STM32 to read several sensor measurements
How can I set up a channel?
I'm looking for it and using it, but I can't see it coming out properly.
They say that you can use ...
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3
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Identifier "i" undefined [closed]
Hello I am using an MSP432 with CCS IDE, I am trying to use an array that points to the next integer in int x[i] ={} for a systick timer to increment the 16x2 lcd position while checking for if ...
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Padauk Mini-c programming language
I want to program Padauk PMS171B ic using Padauk tech emulator and IDE. For this I wish to use mini-c but I don't find any related documents of mini-c. Is there any mini-c documents or example codes ...
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Why is a register initialised through bitwise operations instead of a binary string?
I'm learning microcontrollers, and have picked AVRs to start with. In many AVR tutorials I find the registers are initialised by performing some bitwise operations on the assignment, for example ...
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1
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PIC18F4550 USART transmission keeps repeating
I used the following code to send out an USART asynchronous transmission of a string "AT\n\r" using a PIC18F4550.
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1
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I2C: no ACK from VCNL4200 (slave)
I am writing code for an ATtiny25 to interface with a proximity sensor VCNL4200 (slave address 0x51).
The picture you are seeing is 9 clock signals signifying initial slave address along with write ...
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1
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PIC18F4550 Asynchronous USART Baud Rate
I am trying to implement a USART routine to transmit a string using PIC18F4550. I intend to transmit the message at 115200 baud rate in asynchronous mode. My PIC18F4550 is running at 48MHz using 20MHz ...
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2
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PIC18F4550 CPU appear to be not running at external crystal frequency
I am trying to add a 20MHz external crystal oscillator to my PIC18F4550 microcontroller. The external crystal oscillator circuit connections to the PIC18F4450 is as below:
The Datasheet suggest to ...
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2
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Questions related to the linker script
Hope all is well.
Lately I've been studying linker scripts and I believe I got a gist of it enough to hold a conversation, however I can't find the answers I am looking for to some of the questions I ...
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AVR32 goes to unrecoverable exception when exiting interrupt routine
I'm using an ATUC128D3 microcontroller and have 5 switches connected to it. I have the GPIO interrupt configured to trigger on a falling edge and this works just fine.
It enters the interrupt and the ...
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2
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I2C with LED driver doesn't work
I have a circuit with a PCA9635 PWM LED driver. I want to turn on and off LEDs one after another, but my code does not work. I think the hardware is OK. My micro is a 16F887.
Can you help me?
...
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STM8S ADC scan mode not reading all channels
I am using an STM8S105C6 MCU (user guide), specifically a discovery board, with Cosmic C and the standard peripheral library provided by STM.
I have hooked up 2 signals to channels 0 and 1 of the ADC. ...
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A question about using a 12-bit ADC value in embedded C
I'm using the following STM32's HAL function to read a 12-bit ADC value (0 to 4095) from a channel:
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2
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107
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Keil uVision Disassembly Window with ARM Microcontroller
I have a couple of probably simple questions for you all regarding disassembly from C code to assembly code. I am using Keil uVision as a programmer and debugger with a TIVA TM4C123GXL microcontroller ...
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3
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Best way to interact with MPU
For the simplicity of the problem let's assume I'm using an Arduino.
If, for example, I have this code:
...
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Retry function - I2C hung state handling PIC XC8
This may be a very borderline Stack Overflow question, but I decided to post here because I'm dealing with the I2C protocol for a PIC MCU in XC8.
I'm learning how to talk with devices over I2C and it'...
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3
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321
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Raspberry Pi not reading rotary encoder accurately
I wish to write a program for my Raspberry pi that will print > when a rotary encoder is rotated clockwise and < when its ...
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1
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How to use a variable delay in Microchip PIC microcontroller (MPLAB X), without using floating point arithmetic?
I'm using a PIC10F220.
For some reason, this delay works perfectly fine:
__delay_ms(10);
But, when I try to run a delay with a variable, it gets an error. This ...
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SD FIFO has no data available when mounting with FATFS
Issue
I'm attempting to mount an SD card to my STM32F407 with Elm Chan's FATFS using SDIO and f_mount returns FR_DISK_ERR.
The ...
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2
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String array display on LCD using PIC MCU
I want to display certain messages on an LCD using a PIC MCU (16F887) and mikroC PRO for programming.
I have stored the words in a 2D string array like in the following program:
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Smartfusion2 soft CoreGPIO not working
I am having trouble getting the Digikey MKR board with a Smartfusion M2S010 soft CoreGPIO to run. I am using Libero SoC 2022.1 and Softconsole 2021.3.
Softconsole has all its settings set as per the ...
2
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1
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138
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Strange PORTA behaviour when using bitwise XOR in PIC microcontroller
I am trying to blink an LED using one of the PIC16F15214's timers and I have noticed a strange behaviour.
I have started the project following the PIC1000 (TB3261) guidelines for writing C code and I ...
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2
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PIC16F1517 timer0 does not work
I am trying to use Timer0 to control a blinking LED, but I am having some difficulties... the LED never turns on.
I referred to this tutorial to set things up, but I still can't understand it, could ...
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1
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115
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Alarm gets instantly fired on a Raspberry RP2040
I'm writing a program to manage the velocity of a motor that is remotely controlled.
For security reasons, I want to stop the motor after one second after it receives a command if it doesn't receive ...
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Writing multiple buffers in ping pong mode tiva c
I'm trying to send multiple buffers each of 1k on EPI interface using uDMA on Tiva.
I can send now two buffers in ping pong mode, but not sure where should I do the swapping between the buffers to ...
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1
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ADXL355 Axes Overflowing
I am using an ADXL355 accelerometer on an ADXL355Z evaluation board and an RPI Zero W communicating over SPI, with datasheet here.
I previously had it producing stable g values (with other issues as ...
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2
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STM32 applications hardfault after jumping from the bootloader
I am attempting to write a custom bootloader for a STM32F103C8Tx (64k Flash, 20k RAM variant) on a bluepill board.
When the jump from the bootloader occurs the application immediately hardfaults on ...
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1
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STM32 C function "strstr()" not working
I am trying to use an STM32 microcontroller (STM32L010C6T6 to be exact) to parse NMEA sentences from a GPS module over UART. I receive the messages fine, but run into issues when I look for specific ...
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Display all three colors (red/black/white) on an electronic paper display
I have been trying to drive a 2.13in electronic paper display (EPD) with an Adafruit nRF52 Bluefruit using the SSD1680 driver.
I converted the image to C-code using an online image-to-C-code converter....
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2
answers
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STM32 SD mounting returns error with SDIO
Overview
I'm using a STM32F407ZGT6 and I'm currently trying to mount SD cards (MicroSD 32GB HCI and 256GB XCI picture) to the board using the FATFS library bare-metal. To handle low level I/O, I'm ...
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Which instructions do I use to be able to use UART directly on my STM32F107 microcontroller?
I've tried to figure this out on my own but after almost a week I'm still at more or less the same place where I started. So, I have an STM32F107 microcontroller on a board, which is linked to another ...
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1
answer
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Custom Memory Allocator - How to find the required alignment for a platform?
I'm building a portable arena allocator for embedded systems.
Like for malloc, one of the requirements is to return a pointer aligned with the memory.
The question ...
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2
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1
answer
106
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I2C read() lost 1 bit
I try to use I2C to read data from ADS1110, the address of ADS1110 is seven bits, which is 1001 000. Writing data can only change the configuration register, which ...
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2
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107
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Drivers in C++ produces bigger assembly [closed]
I'm trying to figure out whether C++ is a suitable language for use in device drivers, like peripherals on Cortex-M3/M4.
I started writing some drivers for GPIO and I noticed that it produces bigger ...
1
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1
answer
73
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Noise reduction algorithm for an AC mains voltage measurement
I am measuring and displaying the mains voltage at six inputs with a 12-bit ADC. To make the calculation simple and fast I am only using 11 bits. I am sampling the 50 Hz sine wave at 20 points using a ...
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1
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Confusion with variable update in microcontroller programming
I use an STM32 microcontroller board and to summarize the question, in the following code inside the if clause the variable called ...
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Problem with the output of the engine control signal
Program to control three DC motor levels and display speed (RPM) on a 7-segment LED using 8051. Use external interrupt 0 to read pulse from encoder. When compiling on keil C there is no error, but ...
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1
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2
answers
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Keil C & 8051: DC Motor Speed Control & Display [closed]
I am writing a program to control three DC motor levels and display speed (RPM) on a 7-segment LED display using an 8051. I use an external interrupt to read pulse from encoder. When compiling, the ...
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4
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5
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Would writing to the same flash address reduce the lifespan of an MCU?
I am using an STM8 microcontroller. Since the vector table is in flash memory, I need to write to flash memory in order to create and use the vector table.
Since addresses of vector tables are fixed, ...