Questions tagged [baudrate]

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

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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
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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
66 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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43 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
52 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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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
123 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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240 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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3answers
298 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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157 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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33 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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886 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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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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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
206 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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2k views

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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192 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
366 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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4answers
80k views

Baud rate calculation [closed]

I have an exam tomorrow and I'm confused on the following question, that may be asked in the exam: One byte data with parity bit by using asynchronous serial transmission with two stop bits. For 2K-...
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1answer
100 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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5answers
6k views

Nyquist theorem, seems wrong to me

For Nyquist theorem, for channels without noise the bit rate is: \$N=2B\log_2(L)\$ N= bit rate, B= bandwidth, L= number of levels Intuitively I say that it should be: \$N=B\log_2(L)\$ ...
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1answer
156 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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2answers
6k views

Data rate 9600 bps given what is frequency?

It is said that 9600 bps is the data rate given and if each signal element represents 4 bits then what is frequency? What I did since each signal element represents 4 bits then in a second (9600/4) ...
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1answer
97 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
958 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
640 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
551 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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211 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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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
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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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255 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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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
531 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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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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986 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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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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1answer
2k views

Baudrate and BTR0/BTR1

I am creating an application that uses standard function that sets bitrate. The parameters required are BTR0 and BTR1. But the user of my application will enter the standard value of the Baudrate (eg. ...
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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
349 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
376 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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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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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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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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Is there any reason why using a baud rate of 31250 on an Arduino MIDI project could cause problems?

I have a 600 pulse per revolution optical encoder (and some other stuff) connected to an Arduino Uno (tried it on r2 and r3) through the interrupt pins 2 and 3. While waiting for a my MIDI jack to ...