UART

Started by Nayanip in comp.arch.embedded14 years ago 2 replies

Hello I am working on a communication programme on PC which should work i the old DOS mode and am using Turbo'c'. The baudrate needed i 115200....

Hello I am working on a communication programme on PC which should work i the old DOS mode and am using Turbo'c'. The baudrate needed i 115200. How does one set this baud rate (bioscom does not support) the mother board is about three years old so I guess it may be havin 16550. Can any one suggest where I can get documentation on this IC I tried interrupt to receive and it works OK in win2...


SH7043 Maximum baud rate

Started by vivek in comp.arch.embedded14 years ago 4 replies

Hi all, I am having problems using the Hitachi SH7043 for RS232 communication beyond 38400 Kbps. ( I keep getting Overrun Errors). I...

Hi all, I am having problems using the Hitachi SH7043 for RS232 communication beyond 38400 Kbps. ( I keep getting Overrun Errors). I suspect that the UART's reliable communication limit is 38400Kbps Any help would be greatly appreciated. Thanks in advance, Vivek


Xscale development support - forum/example code?

Started by Sune in comp.arch.embedded11 years ago 2 replies

Hi, where can I get Xscale C development support? I'm stuck with a rather simple interrupt driven UART issue which I think anyone familiar...

Hi, where can I get Xscale C development support? I'm stuck with a rather simple interrupt driven UART issue which I think anyone familiar with this processor can solve in a second. BRs /Sune


uart problem_help

Started by zheng in comp.arch.embedded10 years ago 1 reply

Hi all, I am using dspic30f6010a interfacing pc with rs232. when I use hyperterminal, I can only receive something like <

Hi all, I am using dspic30f6010a interfacing pc with rs232. when I use hyperterminal, I can only receive something like <


What does backspace mean in UART?

Started by Anonymous in comp.arch.embedded14 years ago 8 replies

Hi, I am doing the simulation for a system-on-chip project, the processor is PowerPC and in my code I have something like this, int main...

Hi, I am doing the simulation for a system-on-chip project, the processor is PowerPC and in my code I have something like this, int main (void) { print("Hello \r\n"); print("ByeBye --\r\n"); return 0; } But in the simulator I can only see the "\r\n" after "Hello", I can not see it after "ByeBye --". Instead I see all are 0x8, which is BackSpace. I just wonder ...


Cheap Processors with Fast USARTs for RS485?

Started by Christopher Graham in comp.arch.embedded14 years ago 5 replies

I want to implement low cost rs485-connected data collection nodes, and need to choose a microcontroller for them that will support baud rates...

I want to implement low cost rs485-connected data collection nodes, and need to choose a microcontroller for them that will support baud rates of more than say 400 kbps, preferably up to 1 mbps. I know there are some PIC18Fxxxx's that have an "Advanced UART" that are claimed do this. Other alternatives? - Chris


Serial Communication

Started by V. Chandrasekhar in comp.arch.embedded15 years ago 12 replies

I have some experience programming in C on microcontrollers. On an upcoming project, I will be outputting data from the micro via UART. Someone...

I have some experience programming in C on microcontrollers. On an upcoming project, I will be outputting data from the micro via UART. Someone else will write a Visual Basic program to read this data and display it on a PC. It will be a while before this program is ready. Before this is done, is there a way I can capture my data and look at it from the PC side, via something like Notepad, fo...


Serial port multiplexing? How to?

Started by ElderUberGeek in comp.arch.embedded10 years ago 12 replies

Hi. I have only one available UART on a micro but need to connect two serial devices (chips on the same board). Is there some type of...

Hi. I have only one available UART on a micro but need to connect two serial devices (chips on the same board). Is there some type of chip that can be used that will accept two serial inputs and then I can use a GPIO pin to switch between the sources? The two serial sources need not be used together (meaning when one is being used, the other is not required). Thanks


Do I need a RTOS?

Started by eeboy in comp.arch.embedded10 years ago 47 replies

I am bringing up my first ARM project (based on LM3S1439) and am looking for some advice. In my particular target application the processor will...

I am bringing up my first ARM project (based on LM3S1439) and am looking for some advice. In my particular target application the processor will be communicating with several peripherals via SPI (2) and UART, maintaining a file system, keeping track of time and date as well as performing a lot of GPIO manipulation. The board is also designed with a few external communications ports so that future ...


TFT LCD controller

Started by Bool in comp.arch.embedded5 years ago 5 replies

I'm looking for a low cost solution to connect a TFT LCD at least 7" to the microcontroller by UART/SPI/I2C. I have to show only static graphic...

I'm looking for a low cost solution to connect a TFT LCD at least 7" to the microcontroller by UART/SPI/I2C. I have to show only static graphic with touch operations. FT800 chip looks nice, but unfortunately it only supports a resolution up to 512x512, and 7" TFT has 800x480.


which 8-bit micro

Started by Kim in comp.arch.embedded15 years ago 23 replies

I'm need a micro with following requirements: UART - RS485 inputs = 4 outputs = 4 Also need to drive a seven segment LED or dot matrix. Its...

I'm need a micro with following requirements: UART - RS485 inputs = 4 outputs = 4 Also need to drive a seven segment LED or dot matrix. Its for an remote operator station and the quantity is quite small, but may go to 1000 units over time. Its been awhile since my last project, so I'm not sure whats available today. Would prefer an "all-on-board" chip if possible. Cost is a considera...


Chipcon & other RF transcievers?

Started by Hw in comp.arch.embedded14 years ago 6 replies

Hi everyone. Has anyone here used Chipcon transciever parts? I'm thinking about using the CC2500 or maybe the CC110 for a project and...

Hi everyone. Has anyone here used Chipcon transciever parts? I'm thinking about using the CC2500 or maybe the CC110 for a project and wanted to find out the pro/cons for these devices. Also, is anyone aware of a part in this class (embedded RF, SPI or UART interface) that can do 1 Mbps? Finally, how good do the PCB screened antennas work for indoor use, near and around computers?...


3V <-> 5V Level shifter ?

Started by Martial Chateauvieux in comp.arch.embedded14 years ago 15 replies

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. ...

Hi, I want to connect a GPS Smart antenna SAM LS from u-blox, to the UART of an atmega128 running under 5V. Unfortunately the GPS runs in 3V and has 3V compatible IOs. I set up a 3V regulator already for the power supply. Can someone explain how to build a level shifter from 3V to 5V with a transistor ? (How do I choose it, how to...


Microcontroller selection

Started by Anonymous in comp.arch.embedded13 years ago 19 replies

I'm just wondering if anyone is aware of any > 100MHz 16 bit or 32 processors that are available in QFP packages? I need lots of GPIO as well...

I'm just wondering if anyone is aware of any > 100MHz 16 bit or 32 processors that are available in QFP packages? I need lots of GPIO as well as SPI and UART ports. I've looked at a couple but it seems to jump from 50-60 MHz general use processors from the likes Atmel and Freescale to > 200MHz processors on par with PDA types of duties which are way beyond what I really need (and tend to be in


micrcontrollers with FPUs?

Started by Mike Noone in comp.arch.embedded13 years ago 17 replies

Hi - I was wondering, what microcontrollers are there out there that have FPUs? I'm working with a board that uses an Atmel AT91SAM7X256 (Atmel...

Hi - I was wondering, what microcontrollers are there out there that have FPUs? I'm working with a board that uses an Atmel AT91SAM7X256 (Atmel ARM uC with ARM7TDMI core), and it is perfect except for the lack of a FPU and maybe the max speed of 55Mhz. So what is available as a replacement? Ideally I'd like to see this: 32b FPU SPI (at least one) UART (at least two) TWI CAN timers...


Silicon Labs CP2103

Started by Donald in comp.arch.embedded14 years ago 1 reply

Has anyone here used this chip. Its a USB to UART Bridge with GPIO. I purchased a breakout board from sparkfun but I could not get the...

Has anyone here used this chip. Its a USB to UART Bridge with GPIO. I purchased a breakout board from sparkfun but I could not get the drivers to work on W98se or w2k. http://www.sparkfun.com/shop/index.php?shop=1&cart=404139&cat=66& [about half way down the page.] Thanks for any insight. donald


5V to 3.3V UART conversion

Started by omal...@gmail.com in comp.arch.embedded13 years ago 10 replies

Hey, I am trying to link the 5V serial port on my ADuC831 (8051) to the 3.3V serial port on my Analog Devices DSP board. Transmission is...

Hey, I am trying to link the 5V serial port on my ADuC831 (8051) to the 3.3V serial port on my Analog Devices DSP board. Transmission is one way only (5V -> 3.3V). I have no idea what to do to drop the voltage. I read somewhere that it should simply be a case of adding a series resistor, the value of which could be calculated by finding out the max current from the data sheets o


Why should I (not) use an internal oscillator for 8-bit micros

Started by Schwob in comp.arch.embedded15 years ago 62 replies

Hi, for a low-cost design I need a small 8-bit microcontroller (1-2k Flash will do) and now the question is whether I need to plan for...

Hi, for a low-cost design I need a small 8-bit microcontroller (1-2k Flash will do) and now the question is whether I need to plan for an external resonator or an internal oscillator is good enough. My application will have to communicate through a serial interface to the outside world. I don't know yet if that's going to be a UART or SPI or I2C, could be different for some of our customer...


Need low-cost

Started by CBodd in comp.arch.embedded13 years ago 18 replies

Hi, Hoping I can benefit from the collective wisdom of the folks on this newsgroup. What I am looking for is a simple UART / serial / RS-232...

Hi, Hoping I can benefit from the collective wisdom of the folks on this newsgroup. What I am looking for is a simple UART / serial / RS-232 interface (I know those terms aren't interchangeable), with minimum cost being the goal. The product sales will be in the 50k unit range annually, and the selling price won't be very high at all a few 10s of dollars, if not cheaper. The difference b...


UART speed problem

Started by Jack in comp.arch.embedded9 years ago 11 replies

Hi, I need an opinion: a customer wish to comunicate with our board (that uses a Freescale MC56F8037 to control a BLDC motor with hall sensor...

Hi, I need an opinion: a customer wish to comunicate with our board (that uses a Freescale MC56F8037 to control a BLDC motor with hall sensor for commutations and an encoder for position sensing) via a RS485 bus with a baudrate of 230400 bps. the frames are 16byte in length and a reply is expected within 3 msec (communication should be every 80 msec). I'm not sure that the 8037 can hand...