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How to transmit 96 bits using RS232?

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Ana
Ana 2015-3-31
回答： Ana 2015-4-1
I try to divide the 96 bits in groups of 8 bits and sent them using RS232, after the 96 bits have been sent to a FPGA and it done some operations, I need transmit from the fpga to a computer, a group of 32 bits. Somebody can help me. I try to use the following code in a loop
>>hpo=serial ('COM4','BaudRate',115200,'DataBits',8, 'Parity','none','StopBits',1,'ReadAsyncMode','continuous');
>>DataC=fread(hpo,1);
But I got the following error
Warning: Unsuccessful read: The specified amount of data was not returned within
Thanks

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回答（2 个）

Ganesh Gaonkar
Ganesh Gaonkar 2015-3-31
Some hardware requires hardware-handshaking for communication. This is done by setting the "flowcontrol" to hardware like below:
set(hpo,'FlowControl','hardware');
You can try adding this command after your first command and see if that can solve the issue.
Ana
Ana 2015-4-1
I need send 3 package of 32 bits to a FPGA and after few operations doing by the FPGA, I need transfer a package of 32 bits from the FPGA to my computer using RS232, now I have stored my data in a .txt and these data are in binary form, and I use the following command to separate the 3 first data of my .txt file
clear all;
close all;
clc;
Data1=['000000' data(j,:)];
After send the data, I need to receive in my computer 32 bits, and in the code to program the FPGA I resolve this problem sending 4 package of 8 bits, and in matlab I using the following command:
hpo=serial ('COM4','BaudRate',115200,'DataBits',8, 'Parity','none','StopBits',1,'ReadAsyncMode','continuous ');
DataC=fread(hpo,3);
for i=1:4
DataC=fread(hpo);
arr(i)=DataC
end
fclose(hpo);
delete(hpo);
clear hpo;
But when I communicate the PFGA and the computer I get the following error:
Unsuccessful read: The specified amount of data was not returned within the
Timeout period.
Please Can you Help me?

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