UART x3

Started by jonathan03 in comp.arch.embedded10 years ago 4 replies

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...

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 the trick and has a good C compiler. How would a situation like this be handled in modern electro...


Unwanted voltages on ADC(A3,A6,A7) with UART communication in msp430f2254

Started by manohar2008 in comp.arch.embedded8 years ago

Hi, In my application iam sending the ADC voltages through UART communication, here the problem is, with out UART initialisation the...

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 on those pins (A3,A6,A7) with UART initialisation.below is my UART initilisation code. I am usin...


Does UART is inbuild in FPGA

Started by leenaselvam in comp.arch.embedded9 years ago 3 replies

Is there UART in FPGA or whether UART has to be connnect externally..and how can we send information from FPGA through UART to...

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 VHDL or in Verilog for sending information from FPGA to Ethernet through UART


20 bit UART for 5912OSK

Started by Anonymous in comp.arch.embedded12 years ago 13 replies

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...

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 handle this. However, being 20 data bits, how can I configure the UART code to handle this? I know I nee...


DMA in UART .

Started by Sikandar in comp.arch.embedded11 years ago 5 replies

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...

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 low speeds . Regards in anticipation of replies, Sikandar


UART RX interrupt triggered even though nothing on RX line

Started by galapogos in comp.arch.embedded11 years ago 10 replies

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...

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 detect a device has been connected. When the device is disconnected, I disable my UART simply by dis...


AVR, UART

Started by Umpa in comp.arch.embedded13 years ago 3 replies

Hello, I have got AVR ATmega16. I attached 11059000 Hz oscilator to XTAL1 and XTAL2 (+capacitors). I can send data to the processor (UART)...

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 oscilator for UART? What to do to make AVR's UART working with 11,059MHz oscilator? Piece o...


UART commn using parallel port

Started by Anonymous in comp.arch.embedded13 years ago 3 replies

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...

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 that is there a way that the PC can intepret this data and display it correctly. I am using redhat ...


Regarding retreiving data through UART ports

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

Dear madam/sir, my project is a communication domain project.my application is to process the data that is received through UART port from...

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. 1.can u tell me how can i retrieve data through UART port which is send by other client system(PC)....


test UART

Started by ZHIQUAN in comp.arch.embedded10 years ago

Hi, All I want to use UART to do the transmission between Matlab and FPGA board. I found one from others. I made a simple test to...

Hi, All I want to use UART to do the transmission between Matlab and FPGA board. I found one from others. I made a simple test to realize transmit data to uart and transmit back to matlab. I will write some parts codes of my test here to make sure you know what I am doing. entity uart-top is port( sys_clock : in std_logic; PB_LEFT : in std_logic; RS232_RTS_IN : IN std_logic; ...


GSM modem interfacing with MSP430F2013

Started by Nivi21 in comp.arch.embedded2 years ago 1 reply

The msp430f2013 does not have UART ports. So I found that a software UART can be created and I followed the code from J H Davies book. As I...

The msp430f2013 does not have UART ports. So I found that a software UART can be created and I followed the code from J H Davies book. As I have mentioned in the question, i am basically trying to interface a GSM modem to the MSP. My question are' 1. Is it possible to do this on a software UART? 2. Once I have compiled the software UART program, how do I check it? Can I do this on Hypertermi...


H8/3867 Synchronous Uart False Clocks...

Started by Paul Hackney in comp.arch.embedded13 years ago 2 replies

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,...

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 is sent and the uart will raise RDRF after 7 bits have been received. One protection against this ...


uart stops to receive data

Started by Vega in comp.arch.embedded11 years ago 4 replies

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...

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 to 485 bus, sometimes, after such experiments UART stops (forever) to receive data from the devi...


Interrupt driven UART

Started by gois...@gmail.com in comp.arch.embedded11 years ago 40 replies

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,...

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 have functions that expect to receive and send a single byte by calling receivebyte and sendbyte fu...


back again

Started by rom in comp.arch.embedded9 years ago

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...

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 unfortunately i can't see any interrelations between 'em. it seems, that the uart sends every content of its ...


8051 and SCC2692 uart

Started by Folkert van Heusden in comp.arch.embedded11 years ago 5 replies

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...

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 chip, but how am I supposed to fiddle with it? Is it memory mapped? Does the 8051 have special io-ins...


UART

Started by lee in comp.arch.embedded11 years ago 6 replies

How does the UART know that the device connected to it is ready to receive data?

How does the UART know that the device connected to it is ready to receive data?


Regarding UART(UART is printing infinite times, though not used any loops)

Started by Anonymous in comp.arch.embedded12 years ago 1 reply

Respected Experts, I am Ravi Kumar.N. I am using 386EX processor for one of my application. This processor has an...

Respected Experts, I am Ravi Kumar.N. I am using 386EX processor for one of my application. This processor has an inbuilt UART. I have configured the UART and it is printing the things whatever I want to print but, it is printing the things infinite times though I have not used any loops. For Eg: If I try to print any string like "xyz". It prints the string "xy...


UART design considerations

Started by Keith M in comp.arch.embedded9 years ago 16 replies

I've implemented a simple software-based UART on a 50-mhz Parallax uC. I'm operating it at a baud rate of 2mbps. It talks to an FTDI FT232BM...

I've implemented a simple software-based UART on a 50-mhz Parallax uC. I'm operating it at a baud rate of 2mbps. It talks to an FTDI FT232BM chip (http://www.ftdichip.com/Products/FT232BM.htm) in a usb- serial converter. While I've done extensive testing of the transmit portion of my code, I'm still working on and refining my RX code. Most UART implementations use an over-sampling (I've ...


16550 uart problem

Started by David in comp.arch.embedded13 years ago 3 replies

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...

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 my device. It seems, that the PC has too long to stop it's transmission. The PC is running Windows ...