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USART
Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.
We found 110 threads matching "usart"
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The most relevant threads are listed first
How accurate/tolerant is the PIC USART clock rate?
pomerado@hotmail.com - 2006-08-18 13:23:00
I am looking at a design which uses a PIC18F8520 whose USART is
connected to a PC serial port running at a fairly high data rate. I am
also looking at the design of a serial port instantiated in an FPGA
connected to the same data stream in an RS-485 network. Having to deal
with the internal de...
USART design consideration
tguclu - 2007-07-17 06:50:00
Hi everyone ,i'm new to group.
In my project i need to use 3xUSART ports in order to build a SDLC
network. USART ports will function as the phy of SDLC as V.24
Anyway , this is not the point.
Each USART will work at 64kbps. So there is a network traffic of
almost 192 kps. The problem ise my ...Re: Strange behaviour in PIC18 interrupt
Richard H. - 2005-01-14 21:43:00
Interesting one... I don't know PIC in depth, but here are some
obervations...
* I see you are using 8-N-1 in the screenshot, so this isn't a clock
slip / parity failure, or you'd see garbage. It'd seem the USART is not
sending at all.
* The values keep incrementing, so clearly the ISR ...PIC P18F4550 USART Receive Problem
2007-06-25 08:00:00
Hi,
I'm using the Microchip PICDEM board to test USART on the 4550 PIC.
I'm using the default settings and the test code to tx/rx data via
USART. I can Tx data but Rx doesn't work at all. I've tried all
routes to get it working - any ideas? Is there any pins I need to set
up although I've a...PDC w/ USART
jgoshorn - 2005-07-09 10:25:00
Hello All,
I am implementing hardware handshaking with USART on AT91RM9200 board
(24.6.3.12 in data sheet). I need to make RTS signal orignating from CP
drop to allow the remote device with which the CPU is communicating t
transmit information to the CPU. The data sheet states that the USAR
...Re: Simultaneous use of USARTs and SPI on ATmega64
Mark Borgerson - 2005-02-18 13:46:00
In article , none@none.com
says...
>
> "Anon" schreef in bericht
> news:W7OdnYg8audYbojfRVnyuQ@giganews.com...
> >
> > "Meindert Sprang" wrote in message
> > news:111bpdu5eksmpd6@corp.supernews.com...
> > > "Anon" wrote in message
> > > news:9c2dnfgdk6d3RojfRVnyr...Atmega8 Sleep mode doesn't work with USART
2005-07-20 02:21:00
Hi.
I'd like to use sleep operation with USART but when I use USART with
sleep operation, the system was crashed.
my code like this.
#include
#include
#include
#include
void Uart_Put_Char(unsigned char data)
{
while ( !( UCSRA & (1 < ...USART microcontroller communication
ahmed.sharifi@gmail.com - 2006-02-20 15:02:00
Hello all,
Consider the atmega48 microcontroller by Atmel corp. I want to connects
its USART to my PC. Basically i want the microcontroller to talk to to
computer.
How can i do this?
1. Using a serial port?
2. Can a build my own PCI/ISA card for the pc so that it can read from
the uC ...Re: USART Transmit Issue
karthikbalaguru - 2007-11-29 04:18:00
On Nov 28, 11:43 pm, Ted wrote:
> You might want to try a delay between initialising the USART and
> starting to write to it.
Will it need such a time between initalizing and starting to write ?
Strange :(:( What could be the possible reasons ? Any ideas ?
> The fact that it is outpu...AT91SAM7 USART
comp.zrch.embedded - 2009-04-29 09:59:00
I have an issue with the baud rate clock on a AT91SAM7S processor.
The processor will run from an external 18.432MHz crystal and run at
this frequency or will divide this down to 1.152MHz when it is
required to run in low power mode. We also need to use the USART and
do not want to loose any c...AT91RM900 USART problem
2006-04-11 06:15:00
We have been developing code for the AT91RM9200 and have found problems
with the UART when running the USART 1.5% slower than the selected
boaud rate. A natural consequence with certain clocks and the available
divisors available. The problem is that framing errors are not
correctly detected. i...USART, setting of TRIS register needed (PIC 16F-types) ?
Stef Mientki - 2006-05-20 13:22:00
I'm a little bit confused about the TX and RX pins in UART mode.
I checked several PIC types:
If you read the text carefully, you will read several times:
"bit SPEN () and the TRIS register have to be set in order to
configure the TX and RX pins as the USART"
Now look at the schematics of ...Smart Card Connection to ARM Microcontroller
madhurag - 2007-07-11 09:14:00
Friends,
I am a newbie to the world of embedded systems. So please bear to read
this long message. I have a at91sam9261ek in which I have successfully
ported u-boot and linux (after compiling their source code which I have
downloaded from Linux Link by TimeSys).
Now i wish to connect a smart c...uC favorites?
Bob Stephens - 2004-04-27 16:40:00
I am currently using a Silicon Labs (Cygnal) 8051 derivative -C8051F060 -
in an prototype embedded design. I am looking for a replacement device for
future revisions which would have most or all of the following:
8 or 16 bit architecture
4 or more 8 bit +/- 25 mA ports
2 16 bit 1 Msps A/D
2...Nucleus PLUS sdc.c usart tx buffer seems always full
aclassifier - 2007-06-14 07:24:00
We have a case where we 1) some times loose send character on the
usart and now 2) Nucleus _always_ sees a full tx buffer (after
sending a "random" number of characters first - several KB) and does a
NU_Sleep(1) in a loop forever. This seems to hog the machine. We have
sdc.c version "Nucleus PL...Re: Review my resume. Please.
Gary Kato - 2004-08-21 15:51:00
> If they don't understand USART chances are they don't understand UART
> either.
>
I doubt if the recruiters/Human Resources people understand much at all, but
they pattern match. If the employer is looking for UART experience, then they
will look for UART. They might be able to infer that ...USART, single master (8051), multiple slave (PIC16F876) - suggestions
Bill Davy - 2006-09-29 06:06:00
We built a machine with a CAN bus connecting modules to a CAN board in a PC.
We had a useful little Laser Beam Power Meter [LBPM] board based on a
PIC16F876 attached to CAN. It had a debug serial port. S/w was developed
on MPLAB/CCSC C.
The next machine used a Cypress FX2LP (based on an ...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). ...Re: Why should I (not) use an internal oscillator for 8-bit micros
Sergio Masci - 2004-08-15 21:35:00
Neil Bradley wrote in message
news:10hvisv6ucimkf3@corp.supernews.com...
> "CBFalconer" wrote in message
> news:411FC1AD.91751819@yahoo.com...
> > Neil Bradley wrote:
> > > "CBFalconer" wrote in message
> > > > Neil Bradley wrote:
> > > > > "Schwob" wrote in message
>...Unusual USART behaviour on AVR AT90CAN128
Rav - 2007-07-12 07:50:00
Hi,
I have found some unusual USART behaviour when i was trying to send
characters from USART1 of my AT90CAN128 to the PC terminal. Below is
the code that i have been using for the same. The problem is, what i
am getting on my PC hyperterminal is some garbage. I did some
calculations and foun...Pic18f252 usart problem
PigPOg - 2008-07-11 09:13:00
Hello all
I'm probably overlooking the obvious but I can't seem to get the USART
on the 18F252 working. I've tested Port RC6 to see if anything is
being transmitted but the output remains high. I suspect that I
haven't configured the associated registers properly or the Test
Routine is wrong...USART communication in PIC
Anuhas - 2008-12-23 14:10:00
Dear Experts,
I want to send some AT commands from a PIC through RS232. Give me the
codes in C to send something from PIC that should be displayed in a
hyperterminal
Regards
Anuhas
...Re: Choice between CMOS 4099 or 74HC259
MM - 2005-10-29 07:22:00
antedeluvian wrote:
> MM,
>
> The way I understand your question is that you want to replace a 74HC259
> with a 4099. If this is the case, then you should know that aside from
> anything else, they are not pin compatible. Secondly the Clear function
> appears to be inverse between the de...how to initializatize/re-configure usart?
bcincin - 2007-09-28 07:44:00
Hi. I want to change reset uart and change baud rate with an interface
(combobox) on windows. At the beginning default baud rate is 2400.
ME2 |= UTXE1 + URXE1; // Enable USART1 TXD/RXD
UCTL1 |= CHAR; // 8-bit character
UTCTL1 |= SSEL0; // UCLK = ACLK
UBR01 = 0x0D; // 32k/2400 - 13.65
...Re: Need uC (ARM preferably) with USB device port, internal FLASH and USB device.
Ulf Samuelsson - 2005-02-04 02:34:00
> > I'm looking for uC that has an external bus interface,
> > on-board flash and USB device simalar STMicroelectronics STR710.
> > Package - 144PQFP / 100PQFP or less.
> > May be anybody now another chip with USB device port, internal flash.
> > Two chip solution also is possible.
>...Re: Microchip PIC 18f8722 USART2 Interrupt Problem
Anthony Fremont - 2008-01-25 11:41:00
also posted to alt.microcontrollers.8bit
gary.ireland@ams-neve.com wrote:
> Hi,
>
> Microchip PIC 18f8722 USART2 Interrupt is not working - I have USART1
> working fine with interrupts but cannot get interrupt on usart2 - the
> RC2IF interrupt flag never gets set although data is coming i...Re: Need DSP recommendation
Paul Keinanen - 2004-01-08 02:52:00
On 5 Jan 2004 10:56:46 -0800, ragarwal@fit.edu (Rahul Agarwal) wrote:
> My application is the following. The processor is connected to an
> analog sensor. It needs to sample the sensor to a 10-bit digital value
That should not be a problem, so I do not think that you need a DSP.
> and tr...PIC/AVR serial modes
2008-12-17 11:49:00
Are there other serial modes on PIC/AVR than standard RS-232 and SPI ..?
Especially is there any USART mode where one can send a string of bits longer
than 10 bits without start/stop bits inbetween. Just like an ethernet frame
or such?
...Re: PIC usart problem
techie_alison - 2006-06-29 19:15:00
wrote in message
news:1151333610.439573.258960@u72g2000cwu.googlegroups.com...
> Hi everyone,
> I am having a big trouble with my PIC's serial communication. I have
> codes like these:
Try following the examples on www.piclist.com and then expand on them. :)
You can get some pret...Re: microcontroller (with A/D) that's easy to use in a prototype
John B - 2009-03-30 18:32:00
On 30/03/2009 Matt wrote:
Another vote here for the AVR ATmega8. It's very easy to get started
and comes in 28 pin 0.3" DIP, with 6 off 10-bit ADC channels, plenty of
IO and a USART for serial comms. You can also get a C compiler from
Imagecraft which is a free download and will be fully funct...Re: Sir, How to start establishing a communication between PC and PIC 18F 452
clark - 2009-03-26 18:30:00
> There is a serial comms library for the Microchip C18 compiler.
>
> Leon
You didn't mention if you were programming this in assembly or using
C. Like Leon mentioned, if you are using Microchips C18 compiler,
they have some USART functions in their library. You can get the C18
C Compil...Re: msp430 beginner
Tim Wescott - 2008-04-06 15:38:00
On Sun, 06 Apr 2008 09:32:39 -0500, Grant Edwards wrote:
> On 2008-04-06, darknightx wrote:
>
> > I recently bought a msp-fet430u80 kit form TI and installed MSPGCC . Im
> > used to make desings with PICs from Microchip but this TI MCU for me is
> > really new and I think that I requ...New to PIC
2Penny - 2004-11-30 01:56:00
Hey Folks:
I got a PIC DEMO 2+ board & ICD2 recently. I've used 68k and x86
asm before and now need to find out about PIC asm. I've got
a program that gets the USART going in a PIC 18C452, but I have
an 18F452. How much damage would it do if I just changed all the
references in the asm cod...Re: Which microcontroller do I need?
Jay Maynard - 2007-07-28 12:34:00
On Jul 28, 10:39 am, Petter Gustad wrote:
> Freescale M5223x and the M52235EVB dev board. I'm using a GNU
> toolchain=B9 under Linux. Haven't tried MacOSX. Unfortunately there are
> no free drivers available for the USB FLASH programmer that I know
> of.
That looks like a very good cho...Low power USB Microcontroller
2007-07-10 10:11:00
I wonder if anyone can help, I am looking for a USB Microcontroller
with the following specifications
USB+USART+SPI , possibly not need SPI
USB slow or fast, RS232-300-19200 baud min, prefer upto 115200.
When the USB is in suspend or not connected Microcontroller needs to
run at low speed suc...Re: ATmega8535 and USART post-initialisation delay required?
Michal Machowski - 2005-03-16 08:21:00
Użytkownik "Joe" napisał w
wiadomości news:d11ulf$umv$1@news7.svr.pol.co.uk...
> correction:
> with the short delay, it is CORRECT 20% of the time.
>
>
>
I also needed delay when slave, (ATmega32) responsed to master, ( PC ) by
rs485 wire.
In my case it was coused by fact that oth...Re: ESD problems with PIC 16F88
Paul Rosen - 2007-11-22 14:58:00
lloydcam@gmail.com wrote:
> PIC16F88s.
> Sometimes when you touch the socket with your finger, the PIC responds
> in a manner suggesting that it has received some random data on the Rx
> pin of the USART. The problem occurs much more frequently in cold dry
> weather which I know is worse fo...Rewriting putchar() on MSP430F149
2005-01-14 16:57:00
I think, that only reasonable way to make terminal connection between
MSP430F149 PC, is to rewrite low-level fuction putchar() to use
USART and let upper-level functions like printf() to make all the
conversions needed.
I'm using IAR and/or mspgcc. How do I replace putchar.o in library
files...Re: RS-485 implementation on Lantronix XPort-485
Frank - 2007-02-06 15:13:00
On 6 Feb., 13:58, "Frank" wrote:
> Hi,
>
> just browsed the manuals for Lantronix' XPort-485 (http://www.lantronix.com/support/documentation.html) and I'm a little bit
> confused:
Thanks to you all, especially to Jim Beck. I traced back, where I took
the wrong direction: Application N...