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Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.
We found 698 threads matching "uart"
You are looking at page 1 of 18.
The most relevant threads are listed first
Re: Does UART is inbuild in FPGA
andrew queisser - 2008-02-07 12:12:00
"leenaselvam" wrote in message
news:_7OdnQr-CMZOhzfanZ2dnUVZ_hisnZ2d@giganews.com...
> Is there UART in FPGA or whether UART has to be connnect externally..and
> how can we send information from FPGA through UART to Ethernet........can
> anyone give guidence for writing coding either in V...
DMA in UART .
Sikandar - 2006-07-17 02:31:00
HI,
I am using 16550 compatible UART. While this UART supports max speed of
about 11.5 Kbps which is connected to a V92 dialup modem supporting
speeds upto 64Kbps .
I want to know the logic behind using DMA inside the UART for
transmission to the FIFOs
Is this really required for such lo...UART x3
jonathan03 - 2007-11-17 06:51:00
I am looking for an PIC with three UART ports if such a thing exists. I
have two UART inputs and I want to output a single UART output. I've seen
plenty of ICs with 2 UART ports, but I have yet to find one with three. I
typically use microchip ICs, but I am open to any brand as long as it
would do t...20 bit UART for 5912OSK
2006-01-13 02:46:00
Greetings, I am having some problems with the UART protocol. To my
limited knowledge, I know that the UART is capable of handling more
than the usual 8 data bits. I would need the OMAP to receive 20 bits of
data from an external device. My guess is the UART is the most suitable
protocol to handl...UART commn using parallel port
2004-02-05 19:04:00
I am programming the ATMEGA128 using the parallel port of my PC. The pins
from the programmer go to the UART RX / TX of the MCU for downloading the
program. I want to send debug info from the MCU to the PC using the same
UART. I have code with me to send data using this UART .
--The question is ...uart stops to receive data
Vega - 2006-08-28 07:00:00
Hi, All!
I have a problem with UART on industrial computer JUKI-511.
I use UART to communicate with different 485 devices - simple program
in cycle asks these devices.
Then I enter distortions on 485 bus by (for example) closining
data- and data+ wires or by connecting independent transmitter...UART RX interrupt triggered even though nothing on RX line
galapogos - 2006-12-13 03:29:00
Hi,
I have a problem with my RX interrupt triggering even though there's
nothing on the RX line. Subsequently the RX buffer is 0, and that gets
inserted into my FIFO, resulting in incorrect data.
This happens only when I reinitialize the UART. What I'm doing is
initializing my UART once I d...H8/3867 Synchronous Uart False Clocks...
Paul Hackney - 2004-06-29 07:34:00
Does anybody know how to reset an H8 /3867 synchronous
uart when it is part way through receiving a data byte?
I have tried toggling the RE bit, apparently to no avail.
I believe that noise may be causing a false clock so that
the uart clocks in the first bit. Some period later, the
real data...Regarding retreiving data through UART ports
2007-05-18 08:08:00
Dear madam/sir,
my project is a communication domain project.my application is to
process the data that is received through UART port from other PC.
Madam i established communication between Uart port and com port of
PC using assign debug command.I am able to send data through Uart
port.
...Re: Interrupt driven UART
galapogos - 2006-10-22 20:37:00
CBFalconer wrote:
> galapogos wrote:
> >
> > Another question. Is there any way an MCU can provide a clock to
> > another UART device? I'm asking because I'm trying to emulate
> > ISO7816 via a regular UART, and the smart card needs a 1-5MHz
> > clock(ideally 3.5712MHz for 9600bau...UART SPI MCF5282
Bjoern Braun - 2004-05-04 05:33:00
Hello all,
i have some problems with the UART and the SPI modules of the MCF5282.
What do i have to do to get them running. I work with the senTec evaluation
Board COBRA5282 and a gcc GNU - Compiler. The Compiler is installed on the
host and is running well. The Motorola dBug - Software on...UART
lee - 2006-04-27 13:01:00
How does the UART know that the device connected to it is ready to
receive data?
...Looking for advice on "9 bit" UART SBC
alijsyed - 2005-08-15 13:21:00
I am looking for an SBC that has a "9 bit" UART.
Are there any references or companies anyone can steer me towards.
Thanks
Ali
...Masking/Disabling/Missing interrupts
joshc - 2007-06-09 22:02:00
I know this is implementation specific but to make it a little less
ambiguous let's deal with an XScale or any ARM core for that matter.
Under what conditions would you _miss_ interrupts? Let's say I have a
UART that only generates one interrupt to the interrupt controller but
the source of this...Re: RS232 between PC and embedded MPU
arya - 2005-02-24 22:38:00
I don't know much about software UARTs. You could try a hardware UART
on the SPI bus. The external UART will require an appropriate crystal
to generate the clock signal.
-- Arya
...Re: MCU with 2 serial ports.
Ulf Samuelsson - 2005-05-20 13:36:00
skrev i meddelandet
news:1116608719.738448.293050@g14g2000cwa.googlegroups.com...
> Hi, I need use a MCU with 2 serial ports ( must ), very very small
> package and at least 4/8 Kbytes Flash/OPT. Can anybody recommend any to
> me?
>
ATmega162
7 x 7 mm package (QFN-44).
2 x UART
16...back again
rom - 2008-12-16 09:28:00
hi there,
i started working on the problem again, 'cause the uart is still not able
to send the correct character. (ok, i'm not able to get the uart working
correctly ;)
today, i enabled the fifo, to see what's happening.
with an enabled fifo, the sent (wrong) character changes! but
unfortuna...8051 and SCC2692 uart
Folkert van Heusden - 2006-12-15 07:14:00
Hi,
My boss gave me an embedded device with a 8051 processor coupled to a
SCC2692 (by Philips) uart and the Keil c compiler. Now I was ordered to
develop some kind of pc-interface.
The problem now is: I have absolutely now idea how to access this SCC2692
uart.
I have documentation the chi...Unwanted voltages on ADC(A3,A6,A7) with UART communication in msp430f2254
manohar2008 - 2009-09-02 06:46:00
Hi,
In my application iam sending the ADC voltages through UART
communication, here the problem is, with out UART initialisation the ADC's
perfectly working, but while initialising UART by default the ADC pins
getting 3.2 Volts(VCC).
Can any one help me out , why these voltage are coming ...AT91M55800 UART interrupt + pdc, empty buffer
2007-10-03 17:40:00
I`m using AT91EB55 eval board. My interrupts rutines are based on
functions which simply configure software buffers in order to store(by
PDC) there data from uart. If I put this functions(send_pdc(char
*out_buff, int length) and recieve_pdc(char *in_buff, int length) )
into main function and s...UART on Sharp 79524
Tom - 2005-11-03 07:24:00
I've implemented an interrupt driven UART handler for a Sharp LH79524 and it
seems to be working OK. When I receive a message from my host system then I
transmit one back. All seems fine on that front and the two will chat away
for hours without any bad packets. If I unplug the comms cable the...AVR, UART
Umpa - 2004-05-12 14:02:00
Hello,
I have got AVR ATmega16.
I attached 11059000 Hz oscilator
to XTAL1 and XTAL2 (+capacitors).
I can send data to the processor (UART) but
got wrong characters.
Probably, I haven`t set frequency
parameters correctly.
Do I have to set some extra things
in the code to use external o...UART Emulation
andyko74 - 2009-03-12 07:03:00
I am using an Atmel AT89C5132 and am connecting it through the USB
bootloader to my computer. But I want to interpret the data as a Serial
input.
I have heard you can use UART emulation (Communication Device Class).
Where you can set the USB Class with a virtual COM port in Windows, and
then can ...AT91SAM7S256-128-64-321 USB and USART usage (clocking)
jaac - 2006-04-06 17:08:00
Hi,
I want to know if it is possible to use at the same time the USB and
UART peripheral on the AT91SAM7S256-128-64-321, with zero error on the
UART part.
The clocking scheme is what concerns me. As far as I understand you
have the main clock MCK from an external crystal (or clock signal). ...AT91SAM7S256-128-64-321 USB and USART usage (clocking)
jaac - 2006-04-06 17:08:00
Hi,
I want to know if it is possible to use at the same time the USB and
UART peripheral on the AT91SAM7S256-128-64-321, with zero error on the
UART part.
The clocking scheme is what concerns me. As far as I understand you
have the main clock MCK from an external crystal (or clock signal). ...Isolated UART communication
Rohan - 2007-05-03 14:40:00
Hi All,
I want suggestions about making high-speed opto-isolated UART
communications between
1. Microcoltroller to Microcontroller at TTL Levels.
2. RS232
...32 bit uart
athulyapg - 2007-10-17 09:40:00
Hi
Im trying to implement an 32bit Uart in cyclone 2 fpga(ep2c8t144).
My requirements are as follows:
speed: 9600bps
In built fifo(depth 8)at transmitter and receiver side.
DMA and Modem controller not required.
Can anyone help me with a vhdl code.
...Interrupt driven UART
goister@gmail.com - 2006-10-11 23:11:00
Hi,
I'm working with a Toshiba TMP91 series MCU that doesn't seem to have
any UART control/status bits to check for empty data register, rx/tx
ready, etc, but does have interrupt vectors for serial tx and rx, which
is why I think I have to use interrupt driven UART rather than polling
it.
I ...UART receive issue
mak - 2009-03-12 07:03:00
Hello,
I am facing an issue in UART receive. When i enable the receive enable bit
in the control register, framming and break error bit interrupt is raised.
I clear the error bit in ISR. Then whatever i transmit by my PC
(hyperterminal) its not received by UART on the board.
Note: Transmit fro...Philips LPC UART & CAN baud rates with 1 XTAL
StanV - 2006-01-31 09:11:00
Hi all,
Anyone some advice or experience on calculating the Xtal freq for a
LPC22xx ARM7.
I just don't find a correct value to generate stnadard UART baudrates
(9600, 19200, 38400..) and standard CAN-bus speeds (125,250,500,1000)
At this moment i have a 17.456MHz Xtal and this is working...UART with I2C bus interface
wb0gaz - 2005-07-22 17:24:00
I'm looking for a UART component with I2C bus interface as a
stand-alone part. So far I have only been able to find 16550 type
devices in large multi-pin packages. Is there such a thing? I would
like to have option of 3.3 or 5.0V VCC powering.
Dave wb0gaz@hotmail.com
...Software UART for WindowsXP
2005-03-24 10:07:00
Hello,
I am trying to test a modem by pinging it with some data at 38400 baud
using an 8N1 format over a serial RS232 link. I was wondering if
someone had code (for WinXp) for a software UART which will do the
same.
Any suggestions/ideas/comments on the same will be most welcome.
Thanks,...SPI Uart MAX3110?
Bo - 2005-09-06 08:40:00
I'm considering using the MAX3110E SPI uart on an 8051 SiLabs based design.
Does anyone have or know where I might find some code to implement this
device? Alos any feedback from current users of this part--positive or
negative?
I need to run in interrupt mode as I have many devices in the ...Question on LCD control and UART.
JY Kim - 2007-06-20 06:17:00
Hi.
I have question on UART and LCD control.
I have somehow implemented UART function and it seems to works.
But there is a problem. odd character is printed other than I have
expected.
I tried to print "\r\nStart of Root\r\n\r\nEnd of Root\r\n"
But the following is printed
--
þï
St...Issues on clockless uart
Shashi - 2004-04-21 15:44:00
Hi,
I'm doing a project in clockless uart..as u know that the primary
function of uart is parallel to serial conversion while transmitting
and serial to paralel conversion while receiving..I was wondering if
someone could tell me as how can i do a parallel to serial conversion
and vice versa wi...UARTs and interrupts
Ross Marchant - 2005-05-11 21:19:00
Hi all,
I have been writing code for the ds80c320 and xa-g49 and need a few
questions answered that i'm unsure about.
1. Say i have timer 0 set to interrupt on overflow. If in another interrupt
routine I disable all interrupts, then timer 0 happens to overflow, and then
I enable all interru...16550 uart problem
David - 2004-12-31 06:52:00
Hi all,
I have a 16550 uart running at 115200 8N1.
The level at which the UART generates an Interrupt when receiving data is 8.
This means if it has 8 bytes of 16 of it's input fifo filled, it will make
the interrupt.
But I have still data loss if receiving large amounts of data from a PC to
m...Enabling Altera Avalon UART serial device driver
S - 2007-12-12 15:39:00
Hi all,
I'm trying to configure eCos and I have enabled the Hardware Serial
Device Driver option. However the Altera Avalon UART serial device
driver is grayed out. It means that the driver for this UART serial
device is disabled, doesn't it? Any suggestions on how to enable this?
Thanks in a...8051 - UART driver
Prem - 2005-02-04 08:53:00
Hi Experts,
I am looking for some UART driver resources as I work on Dallas
DS89C450 chip? I need to work with > 1mbps in the serial interface? Any
help would be appreciated..Thanks again
PS
...Providing a clock with an MCU
galapogos - 2006-10-23 08:59:00
Hi,
I'm trying to communicate with a smart card via iso7816 by emulating
the T=0 protocol using a generic MCU's UART interface. One problem I'm
having is providing a clock to the smart card(~3.5712MHz) w/o the use
of a seperate crystal. Obviously using the GPIO pins would be too slow,
and the...