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Serial port Communication PC and AT89C52 ( continuted )
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Author
Justin Wong- Posted
4-Dec-2004 02:21 GMT Toolset
C51 |
 Serial port Communication PC and AT89C52 ( continuted )Justin Wong-
Here was my plan to realize the communication between PC and AT89C52, Both of them are set to 2400 (baud rate), N, 8, 1.1. I have shortened pin 2 and pin 3 of RS-232 attached to PC. When my pc was sending out DATA, at the same time it can receive this DATA. After doing this, I found my PC can correctly receive the DATA just sent out. 2. The following is my C51 code. After receiving the incoming data, I want to show that data by LED connected to P1 port. I thought my C51 code should be wrong, but I really have no idea……Please help me…. Sincere Thanks in advance. unsigned char ISRIN; unsigned char ISROUT; unsigned char SERIALISRIN; void DELAY (); void INI_SERIAL(); unsigned char RECE_SERIAL (); void main () { unsigned char DATD; P1 = 0xff; INI_SERIAL(); While(1) { if (ISRIN ) { ISRIN = 0; DATD = RECE_SERIAL (); } } } void SERIAL_ISR ( ) interrupt 4 using 1 ( if ( TI ) { TI = 0 ; ISROUT = 1; } if ( RI ) { RI = 0; ISRIN = 1; } } void INI_SERIAL() { EA = 0; T2CON = 0x34; RCAP2L = 0x64; RCAP2H = 0xff; TL2 = 0x64; TH2 = 0xff; SCON= 0x50; TI = 0; RI = 0; TR2 = 1; ES= 1; EA =1; } unsigned char RECE_SERIAL () { unsigned char DAT; P1 = SBUF; DAT = P1; DELAY (); P1 = 0xff; return DAT; } |
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Author
Andrew Neil Posted
4-Dec-2004 10:52 GMT Toolset
C51 |
RE: Serial port Communication PC and AT89C52 ( continuted ) Andrew Neil
Why are you starting a new thread?Please re-post your code, and follow the instructions this time: there are 3 bullet points above the "Message" window when you post - the 3rd one tells you what to do with source code. There is also a link to Tips for Posting Messages: http://www.keil.com/forum/tips.asp |
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Author
Justin Wong Posted
5-Dec-2004 04:11 GMT Toolset
C51 |
RE: Serial port Communication PC and AT89C52 ( continuted ) Justin Wong
Here was my plan to realize the communication between PC and AT89C52, Both of them are set to 2400 (baud rate), N, 8, 1.1. I have shortened pin 2 and pin 3 of RS-232 attached to PC. When my pc was sending out DATA, at the same time it can receive this DATA. After doing this, I found my PC can correctly receive the DATA just sent out. 2. The following is my C51 code. After receiving the incoming data, I want to show that data by LED connected to P1 port. I thought my C51 code should be wrong, but I really have no idea……Please help me…. Sincere Thanks in advance.
unsigned char ISRIN;
unsigned char ISROUT;
unsigned char SERIALISRIN;
void DELAY ();
void INI_SERIAL();
unsigned char RECE_SERIAL ();
void main ()
{
unsigned char DATD;
P1 = 0xff;
INI_SERIAL();
While(1) {
if (ISRIN ) {
ISRIN = 0;
DATD = RECE_SERIAL ();
}
}
}
void SERIAL_ISR ( ) interrupt 4 using 1 (
if ( TI ) {
TI = 0 ;
ISROUT = 1;
}
if ( RI ) {
RI = 0;
ISRIN = 1;
}
}
void INI_SERIAL() {
EA = 0;
T2CON = 0x34;
RCAP2L = 0x64;
RCAP2H = 0xff;
TL2 = 0x64;
TH2 = 0xff;
SCON= 0x50;
TI = 0;
RI = 0;
TR2 = 1;
ES= 1;
EA =1;
}
unsigned char RECE_SERIAL () {
unsigned char DAT;
P1 = SBUF;
DAT = P1;
DELAY ();
P1 = 0xff;
return DAT;
} .
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Author
Justin Wong Posted
5-Dec-2004 04:29 GMT Toolset
C51 |
RE: Serial port Communication PC and AT89C52 ( continuted ) Justin Wong
By the way,how to select AT89C52 Timer 2 Serial Clock Divisor? right now, I am sure my MCU is working correctly for receiving and sending out the data ( I did this under a friend's suggestion ). SO I thought the Serial Clock Divisor of AT89C52 is wrong.Would you help me to check it? Thank you. |
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Author
Andrew Neil Posted
6-Dec-2004 00:38 GMT Toolset
C51 |
RE: Serial port Communication PC and AT89C52 ( continuted ) Andrew Neil
OK, now you've got the 'pre' and '/pre' tags sussed, the whole point of using them is to preserve the layout of your code!Please go back to your original, formmatted code and post that between 'pre' and '/pre' tags. For example, void main ()
{
unsigned char DATD;
P1 = 0xff;
INI_SERIAL();
While(1) {
if (ISRIN ) {
ISRIN = 0;
DATD = RECE_SERIAL ();
}
}
}
Remember: don't use TABs; use only spaces for layout. |
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