writting Software UART 8051

A

ahmedragia21

Member

• Nov 8, 2007

• #1

hi, im trying to write a software UART , im simulating it in proteus and using a 8051 cpu , 89S52...

Code:

void main()
{

TMOD=0x20;
TH1=-3;
SCON=0x50;
TR1=1;

while (1)
{
unsigned char a;
a=0x41; // Send Characther A
P3_7=1; //
P3_7=0; // Start Bit
delayms(1);
for (i = 0; i < 8; i++) { // send the bits
 b[i] = a & 1; a = a >> 1;
 P3_7=b[i];  // Pin_3.7
delayms(1);
 }

i dont know but in the virtual terminal it should display the chracther A but it doesnt ... i dont know really why

 

A

ajay_bhargav

New Member

• Nov 10, 2007

• #2

check my serial tutorial

https://www.8051projects.net/serial-communication/

i have written a software uart.. u can use it in C also.. hope it will help.. i have tested it on hardware.. works fine

 

A

ahmedragia21

Member

• Nov 10, 2007

• #3

many many thanks !!

i read ur article , can i've the C Code version ?
or at least the project ?
i wrote it and it worked , send me ur email and i will send u mine codes and analyze it ...

 

Last edited: Nov 10, 2007

H

hasp.sharp

New Member

• Mar 13, 2013

• #4

need software UART 8051

hi,

i need C code for software UART in 8051. because my task is i have to communicate the GSM modem with the 8051 microcontroller. for this i need to receive the message from the gsm and send the msg to the another one microcontroller. so i need two UART. i can communicate the GSM using hardware UART. but i need to communicate the another one microcontroller with this microcontroller by using software uart or any other ways?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Mar 14, 2013

• #5

Or buy a chip with two uart's The at89c51re2 for example...

 

H

hasp.sharp

New Member

• Mar 14, 2013

• #6

what about software UART sir. am having at89s52 controller only

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Mar 14, 2013

• #7

Ok... Then do a software serial... Its up to you.... 8052.com is the best place to be..

 

H

hasp.sharp

New Member

• Mar 14, 2013

• #8

is there any posibility to perform both tx&rx between two separate devices with one 89s52microcontroller

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Mar 14, 2013

• #9

Of course you can... The hardware UART can be set up with interrupt driven ( or not) and the the software could be polled...

 

H

hasp.sharp

New Member

• Mar 14, 2013

• #10

thank you for your information sir. please give the coding for software UART

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Mar 15, 2013

• #11

hasp.sharp said:

thank you for your information sir. please give the coding for software UART

Click to expand...

I haven't done any for the 51 series... Try www.8052.com