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Questions tagged [baudrate]

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

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Data rate with modulation and conventional encoding

I had a rather simple question. Say I had a SISO communications system with an information data rate of 50 Mbps that uses QPSK modulation and a rate 1/2 conventional coding. What would be my symbol ...
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0answers
70 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
50 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
106 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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92 views

Android usb communication - How to set a non-standard baud rate for read and write data? [closed]

I would like to know if in adroid it is possible to have baud rates different from the default ones for usb communication with a pcb / arduino board, I would like to send a frame with a particular ...
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1answer
54 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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41 views

How to set minicom to a baudrate of 6M?

I am using minicom to test the USART from my STM32. Now i want to test my USART at a baudrate of 6 MBaud, but if i type in minicom -b 6000000 it opens minicom ...
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2answers
124 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
57 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
86 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
87 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
47 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
382 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
293 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
313 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
157 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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0answers
54 views

Baudrate in a STM32L152 Discovery

I have the following code: ...
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1answer
588 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
719 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
2k 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
137 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
410 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
1k 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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0answers
245 views

Sending Data with HC05 Bluetooth module

I have set of data that i want to send them via h-05 Bluetooth module.But data has variable baud rate and i don't know the baud rates.How can i do it?Is there any Bluetooth module that don't care to ...
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1answer
788 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
283 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
326 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
2k 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
738 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
3k 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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0answers
1k views

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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7answers
4k views

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
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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3answers
3k 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
2k 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
880 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? ...
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1answer
142 views

UART works when I open minicom before starting UART

I am trying to send out large amounts of data at 115200 via UART. I have come across a rather strange problem. I am sending out data in the while loop of the MCU. The MCU is not doing anything else. I ...
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1answer
183 views

1200 Baud Rate UART at a 9kHz clock speed [closed]

I just did the math and with the internal clock of the ATMega328. The lowest clock frequency that you could use to have a 1200 Baud rate is 9.6kHz. Unfortunately I need to be under 9kHz. Is there ...
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1answer
1k views

Setting baud rate for Atmega328p with setbaud.h

I'm working with an Atmega328p, running off the internal 8MHz oscillator, divided by 8 to produce a 1MHz clock. I set the fuses according to the calculator here. Confirming this with avrdude: ...
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5answers
20k views

Baud rate vs. Bit rate

When we initialize a serial communication, we usually have to set the baud rate (e.g. 115200) I notice that many people assume that 115200 means 115200 bits per second. However, each baud(signal ...
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2answers
4k 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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3answers
2k views

UART communication not working with higher baud rate values?

I have a PIC32MX795F512L which is connected to 8MHZ crystal. UART program is working with ...
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1answer
696 views

Calculating the correct BAUD for the ATMEGA168A

What is the correct way to set the BAUD when programming an ATMEGA168A? The code below works fine, however I don't know exactly what to do in case I decide to work with a higher BAUD such as 9600: <...
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1answer
94 views

Allowed error in baud rate between pic and Bluetooth module [duplicate]

I'm trying to connect a dsPIC33FJ128MC804 - 16 bit pic - with a Bluetooth module the problem is i have few baud rates of Bluetooth to choose between them , searched the net but could not find the ...
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1answer
1k views

How to set baud rate 57600 with CH340G?

I'm working on android drivers (native code) for CH340G USB-to-serial chip. I've successfully tested it with baudrate 115200 and Arduino Uno CH340G but for some reason it does not work with baudrate ...
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1answer
286 views

6Mbaud UART with Bus Pirate V4

I would like to sniff data on an SPI bus running at a clock rate of 6 MHz. I would like to use the Bus Pirate V4 for this task. The sniffing itself is supported up to 10 MHz, the problem is getting ...
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1answer
468 views

What is the speed of a baud rate? - RN42

After wondering/researching about this for days, I finally ask this question: What is the speed (bits per second) of a bluetooth SPP RN-42 device? Is 1 baud = 1 bit (thus 9600 baud = 9600 bits per ...
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3answers
3k views

Is there a way to change baud rate of a Bluetooth module wireless?

Or is there any other trick to do it? I need to change a baud rate of my Bluetooth module, I have tried it via Windows Bluetooth settings of the particular Bluetooth device, but that doesn't work. ...