Questions tagged [baudrate]

Often misused term, when "bit-rate" is meant.

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2 devices with different CAN baud

I have a project where I need to talk with 2 devices x & y with 125kbps and 500kbps CAN speeds respectively. So I selected an MCU (F446RC) with 2 CAN controllers from ST. The BOM cost went up and ...
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1answer
40 views

MSP430FR2433 SPI data corrupted

I'm currently working with MSP430FR2433 Micro. I want to interface this micro with the following modules: LCD screen via SPI (https://www.orientdisplay.com/store/amc0802br-b-y6wfdy-spi-8x2-character-...
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1answer
54 views

Bit error rate calculation for LIN protocol

I am having this microcontroller - S32K142 64 Pin 5V Core voltage Microcontroller Reference Manual I am using an 8MHz external clock. I want to calculate the Bit error rate of my LIN Communication. My ...
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3answers
76 views

Ambiguity about concept of baud rate and bit rate

I know that there is lots of questions and answers that is related to this topic, but i can not clearly and distinctively find answers to my questions, yet. In addition i found some answers which ...
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Access Microcontroller from Atmel Studio (SAM V71 Xplained Ultra)

I've used Visual Studio before when working with C++ but am completely new to microcontrollers and Atmel Studio (using version 7.0 on Windows 10). In my first attempt to learn more about ...
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1answer
56 views

what is the meaning of BLE data rate 1Mbps?

I am using BLE HM10 module which is BLE 4.0 1Mbps assume I have 1000000 data bits to send within a second, so I need 1Mbps bandwidth, Is 1Mbps only for Data bits? or 1Mbps means complete ...
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2answers
83 views

What is the meaning of Angular Velocity Vector 100Hz of BNO055?

I am using an Arduino Nano with BNO055 Adafruit library. The I2C speed is 400 kHz. The Adafruit BNO055 Absolute Orientation Sensor mentions Angular Velocity Vector (100 Hz). What does this 100 Hz ...
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1answer
44 views

How does i2c standard or fast mode effect the output data rate of the sensor?

I am using BNO055 motion sensor supports standard mode 100kHz and fast mode 400kHz but sensor specifies following Gravity Vector 100Hz Euler Vector, 100Hz Quaternion, 100Hz Magnetic Field ...
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2answers
102 views

Is there hardware compatibility between CAN 2.0 High Speed, Low Speed and CAN-FD?

I am studying CAN interface hardware for the design of an automotive scanner. So far, I have identified the following types of CAN: CAN 2.0 High-Speed: bit rate up to 1Mbps CAN 2.0 Low Speed: bit ...
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2answers
91 views

Can you use a CAN FD transceiver for low speed (fault tolerant) CAN?

Fault tolerant CAN (ISO11898-3) is terminated differently than high speed CAN (ISO11898-2). Therefore the signal levels for dominant and especially recessive bits differ. Newer CAN FD compatible ...
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2answers
371 views

ATSAMC21 - CAN configuration - Nominal bit timing vs. data bit timing & time quanta calculation

I'm trying to configure the CAN bit rate of an ATSAMC21 to 125ksps in a CAN2.0B configuration. However, after reading through the datasheet, the ASF documentation and the ATMEL start help I'm confused....
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3answers
694 views

How to demonstrate the effect of baudrate in serial communication

Regarding baudrate in serial communication, the only requirement is that both devices operate at the same rate. The common baud rates are 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 ect. ...
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163 views

How can I possibly get a 9600Hz square wave, for a serial baud rate?

I'm trying to create parallel to RS-232 serial converter using standard logic (serial transmitter only, no serial receive functionality). To get the clock signal my idea was to get a 7.3728MHz ...
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1answer
38 views

Atmega328 ubrr value shifting issue for serial transmission

My doubt is about the way in which the baudrate value is written into UBRRn registers. For eg: Lets say i want to write the value 25 into UBBRn registers to configure the microcontroller to ...
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3answers
1k views

Baud Rate Generator [closed]

I came across a block called Baud rate generator when reading about the TIVA UART module. I also came across the below formula for calculating the Baud rate divisor, Baud Rate Divisor = UARTSysClk/ ...
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1answer
56 views

Transmission of serial data characters

On a serial data link characters are transmitted data rate of 9600 baud. if characters are 8 bits and there is one start bit and one stop bit per character, then what is the number of characters ...
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105 views

How can I estimate the minimum baudrate for a given bitrate?

My circuit performs data acquisition at 250 samples/s, 24 bits/sample and transmit this information to the local host (PC) through a bluetooth module that implements the UART protocol. As far as I ...
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1answer
379 views

Transmission distance rs485 vs ethernet

I have a question, why is rs485 limited to less than 100 meters at 10mpbs ( mbaud ) and is 100Base-TX ethernet applicable on 100 meters with 100 mbps bitrate i know that rs485 normally use a sort ...
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1answer
219 views

How does Nyquist bit rate formula relate Bandwidth, Signal Rate, and Bit Rate?

I know what each of Bandwidth, Signal rate, and Bit rate mean. But I am having trouble in their mathematical relationship with each other. I will use the notation of the textbook I am reading from (...
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238 views

Baud rate for Square Wave data signal via UART if frequency is given

I was trying to solve the 2013 paper set by ISRO for electrical engineers. Question no 13 made me confused. So since Idle in UART is usually high and start bit is low, we can find the 8 bit data ...
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2answers
471 views

MSP430 Baud Rate Generation: Datasheet Discrepancy

My project is based around the MSP430F5529. From the MSP430x5xx family user guide: NOTE: Baud-rate settings quick set up To calculate the correct the correct settings for the baud-rate ...
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1answer
109 views

MSP430 USB Module and Baud Rate Detection

I am working on a project which uses the USB module integrated into the MSP430F5529, specifically using the MSP-EXP430F5529LP development board from TI. I am using the USB API provided in MSPWare. ...
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1answer
177 views

UART stop bit baud timing error

On PIC micro controller UART, Baud rate was set to 38400 (No parity,, 8 data bits), ...
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1answer
98 views

Why is the signal rate separated into three case?

The definition of signal rate is number of signal elements (timewise shortest unit) sent in 1s. The book says that the signal rate of all 1s or all 0s may be different from a data pattern of ...
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1answer
51 views

Bandwidth (Data rate) of a laser beam when no datasheet exists for the module

I ordered a large number of laser modules that look like the following: When inspecting mine with a basic multimeter, I noticed a 90 ohm smd resistor is fitted on the module. I see no other ...
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2answers
1k views

Max SPI data rate supported

This is probably relevant for all SPI compatible chips but I'm asking for the DRV8711 in particular. The data sheet lists the SPI timing requirements and I was wondering how to get the maximum data ...
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1answer
750 views

Communication between different Baud rates [closed]

I am totally new to just about all of this, first off. I have two boards that I want to be able to communicate. Both are using half-duplex serial connection, but one is fixed at 4800bps, and the ...
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2answers
619 views

Efficient size of FIFO buffer for UART

I am designing a software for a microcontroller that transmits and receive data from various UARTs in a loop every 15ms. I am using UART interrupts to send and receive data. UART interrupt copy bytes ...
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1answer
233 views

Unexpected Atmega16 response over UART

Unexpected Atmega16 response over UART Brief problem summary I have flashed an Atmega16 with code that should result in the Atmega16 sending back whatever character I send to it via a terminal. I ...
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55 views

Baudrate in a STM32L152 Discovery

I have the following code: ...
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1answer
1k views

USART baudrate in STM32L152

I am trying to figure out how to configure the USART of the mentioned discovery board for a transmission of 14400,8,N,1. My problem is that I don't know what to put in the USARTx\$\rightarrow\$BRR ...
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1answer
1k views

Baudrate calculation

I am having a hard time to calculate the baud rate for the following: Needed baud rate for 2 bytes data at 1KHz over an UART port with a 8N1 protocol Thanks
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2answers
6k views

Time for serial data(UART) transmission

Dear all i have a very simple question on serial data transmission. signed int NUM;//32 bit NUM=235; the serial configuration is: 115200 baud rate 1 start 1 ...
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1answer
299 views

Absolute minimum delay required to process data across shift registers

In an effort to make my serial data processing faster, I attempted to use serial mode 0 with a system clock speed of about 3.686Mhz. Its clock comes from the ALE output of an unprogrammed at89S52 that ...
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2answers
1k views

Does a baudrate in serial communication (USB or RS232) need to be exact?

In serial communication, does the baudrate mean we have to use the exact clock speed or is it a range of speeds that we can use? and if it's an exact value, how exact should it be ? for example, can ...
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1answer
589 views

UART devices: Baud rates different by a factor

I have UART devices where I can chose various non-standard speeds, but none of them are matching. There are however some speeds, that are a multiple of the other device's speeds. For instance, I could ...
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1answer
2k views

UART - the clock frequency of the uart transmiter iis different from uart receiver

I use UART between two system (which have 2 proccesors). The uart of transmiter has clock frequency off 100MHz. and the uart of the receiver has a clock of 125MHz. The baud rate I use is 1e6. I can ...
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1answer
1k views

How does 16550 UART handle non-integer baud rates? [closed]

The 16550 UART calculates the baud rate using formula 115200 divided by the 16-bit number obtained by concatinating the High and Low DL registers. There are several well-known divisors that get you ...
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4answers
1k views

Baud to bit mapping for the UART?

Before starting the question, a reminder of the difference between on how a baud rate and a bit rate relate. Two people are standing 1km apart and they want to exchange a 8 bits of data. ...
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5answers
387 views

How can I be sure that a multi-bit-per-symbol encoding schema exists?

(I came up with this question when I try to understand bit rate and baud rate.) Suppose I have some data to transfer. And the data is binary encoded as a data amount of N bits. If I use 2 symbols to ...
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1answer
388 views

Teensy 3.2 receives garbage values from HM-11 BLE module

Recently purchased an Hm-11 BLE module, and connected it to a Teensy 3.2. I can see the BLE module (AnyFlite) on my phone using the MSMBle app. The following code was used to initialize it: ...
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3answers
4k views

What difference does the clock make in synchronous vs asynchronous communication?

I am new to embedded programming and have very little knowledge in how digital/electronic system works, but I have been given a task to bring up USART communication between two chips. For that, I ...
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1answer
1k views

Why is the CAN bus always busy (microcontroller)?

I'm trying without success to perform CAN bus communication between an microcontroller and the host (my computer). My question does not depend on the microcontroller, but on the CAN Bus (classic CAN). ...
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2answers
4k views

How to calculate baud rate and determine the number of stop bits in asynchronous serial

Below is the given question: For my understanding, 1/baud_rate = 104.16 However, when I tried to do reverse division, the result is so different than expected. My calculation to find baud rate: 1/...
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Using HC05 Bluetooth SerialPort to stream music/voice via Arduino

I'm considering streaming music/voice over Bluetooth serial link (via HC05) from PC to Arduino. By doing this, there would be no need for a SD card. Here is the questions I have. Any help is ...
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How do some microcontrollers implement baud rates even though it uses crystal frequency not scalable to standard baud rates?

I just realized that the 8051 family uses 11.0592 MHz and its multiples so as to generate standard baud rates. But there are SoCs which use 15 MHz. How do they do this then?
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1answer
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STM32L0 Low power UART-receiver reads the wrong data at high baudrate after MCU waking up

I'm using a STM32L0 MCU for my project. The MCU has a Low-power Timer (LPTIM) for waking the MCU up from Stop-Mode, and a Low-power UART (LPUART) for both waking up the MCU from stop mode and receive/...
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3answers
4k views

How do two UARTS know which baud rate to use?

I am reading about the standard protocol for UART and I think that if the receiving UART does not have any idea on what baud rate the data was transmitted, there would be lots of problems. If the ...
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2answers
3k views

UART baud rate error tolerance

I have a question regarding the UART baud rate error tolerance, as the thread title indicates. First of all, I want to point to an excellent tutorial on clock accuracy: Maxim Integrated Tutorial I ...
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1answer
1k views

Can I connect a CAN node with 250 kbit/s to a CAN bus running at 500 kbit/s?

I'm trying to connect an automatic car gearbox which is using the CAN bus at 250 kbit/s to car with bus speed 500 kbit/s. Is it possible to have nodes with different speeds on the CAN bus? ...