How to send data using rs232?

hello ..

i want to use rs232 as input to board ,am using Quartus ii .

the rs232 is connected to a speed sensor that generate pulses ,do you have any idea how can the board read these pulses through the rs232 and count them ??(this is my senior project ........ )

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hello ..

i want to use rs232 as input to board ,am using Quartus ii .

the rs232 is connected to a speed sensor that generate pulses ,do you have any idea how can the board read these pulses through the rs232 and count them ??(this is my senior project ........ )

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1.> what boude rate your speed sensor generate data.?

2.> is it use some start/stop , parity bit for makeing serial bit stream.?

follow the same protocol at receiver end also.

First you test your speed sensor weather it generate correct rs232 data by connecting this speed sensor serial bit stream to windows Hyperterninal utility ...this utility will display all the bit steram your speed senser generate. make sure while using Hyperterminal u must make a cross cable (Tx of Speed sensor connected to Rx of your Rx"PC").

Or if your speed sensor is correctly generated the serial bit stream then you straight away connect serial cable from Speed sensor to board and write application in eclips environment, for reading this port use fread and for writing use fprintf.

kaushal

Thanks for your reply.

i think that my sensor is not generating the right data , it just produce pulses, it is maximum voltage is 1.2V ,and the minimum voltage is .5V .

what i don't understand is how to make the FPGA(Altera DE2-70) broad understand these pulses? and count only the pulses with the maximum voltage.

and do you think in that case that the rs232 will be the best choice for me or do you recommend something else ?

Kindly Note : am using verilog language ,and Quartus ii to download the code on the fpga.

thank you for your help .

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Thanks for your reply.

i think that my sensor is not generating the right data , it just produce pulses, it is maximum voltage is 1.2V ,and the minimum voltage is .5V .

what i don't understand is how to make the FPGA(Altera DE2-70) broad understand these pulses? and count only the pulses with the maximum voltage.

and do you think in that case that the rs232 will be the best choice for me or do you recommend something else ?

Kindly Note : am using verilog language ,and Quartus ii to download the code on the fpga.

thank you for your help .

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1. First you amplify this voltage level (translater can do this job) and make data suitable for FPGA readiable ( like 3.2 volt etc)

2. Give this pulse to FPGA and inside FPGA design a Counter which trigger by this pulses. evely pulse, increase counter value and u can easily track the max value.

3. if youre sensor give data in RS232 format than you daon't have any problem if not thyen follow the point 2..

4. i am not much familear with verilog.....but you can do this job in verilog also.

gud luck

kaushal

thank you for your replay

i want to ask about SOPC BUILDER , what software do i need to use ???do i need to install altera moniter program and is there any other program that i can work with ??

and how i will integrate the SOPC builder to my project ??

and i use this program it gave me this error Using cable "USB-Blaster [USB-0]", device 1, instance 0x00

Resetting and pausing target processor: FAILED

Leaving target processor paused...

http://www.alteraforum.com/forum//proweb/misc/progress.gif

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thank you for your replay

i want to ask about SOPC BUILDER , what software do i need to use ???do i need to install altera moniter program and is there any other program that i can work with ??

and how i will integrate the SOPC builder to my project ??

and i use this program it gave me this error Using cable "USB-Blaster [USB-0]", device 1, instance 0x00

Resetting and pausing target processor: FAILED

Leaving target processor paused...

http://www.alteraforum.com/forum//proweb/misc/progress.gif

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Hello There,

1.All you need to do is to just add UART in your system design in SOPC builder, and then generate new bsp. it will solve your first problem.

2. in your eclips environment, ther you will find debug option just click on them and then enable usb blaster...this will solve your second problem.

gud luck

hello again

my gradution project submission next week , right now it is not working,i want to ask you can i use directly pin assigment for my input in assigment pin editior in quartus , i want to connect the input on the GPIO(expantion header 40 pin) on PIN_A0 to FPGA ??? wiil it work ?

kindly NOte : the input is square pulses.

thank you

Yes , you can but make sure that the pin you are going to use should not be a dedicated pin on you board..

there is no problem for connecting the expantion header pin on fpga.

kaushal