hnam
16-10-2009, 05:50 PM
hiện tại mình đang tìm hiểu giao thức truyền UART trong PIC24FJ128GA010 mình sử dụng kit phát triển explorer 16 của microchip. mình đã đọc kĩ phần datasheet nhưng mình test thử 3 ngày rồi mà không thành công mong các bạn góp ý cho code mẫu sau. mục tiêu của code mẫu là nhân data từ hyper terminal và trả lại. hệ thống mình sử dụng thạch anh 8 mhz
#include <p24fj128ga010.h>
_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & COE_OFF & FWDTEN_OFF & ICS_PGx2)
_CONFIG2( FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMOD_HS & FNOSC_PRI)
// I/O definitions for the Explorer16
#define CTS _RF12 // Cleart To Send, input, HW handshake
#define RTS _RF13 // Request To Send, output, HW handshake
#define TRTS TRISFbits.TRISF13 // tris control for RTS pin
// timing and baud rate calculations
#define BRATE 12 // 19200 baud (BREGH=0)
#define U_ENABLE 0x8000 // enable the UART peripheral (BREGH=0)
#define U_TX 0x0400 // enable transmission
// initialize the UART2 serial port
void initU2( void)
{
TRISFbits.TRISF5 = 0;
TRISFbits.TRISF4 = 1;
LATFbits.LATF5 = 1;
U2BRG = BRATE;
U2MODE = U_ENABLE;
U2STA = U_TX;
TRTS = 0; // make RTS output
RTS = 1; // set RTS default status
} // initU2
// send a character to the UART2 serial port
char putU2( char c)
{
//while ( CTS); // wait for !CTS, clear to send
while ( U2STAbits.UTXBF); // wait while Tx buffer full
U2TXREG = c;
return c;
} // putU2
// wait for a new character to arrive to the UART2 serial port
char getU2( void)
{
//RTS = 0; // assert Request To Send !RTS
while ( !U2STAbits.URXDA); // wait for a new character to arrive
//RTS = 1;
return U2RXREG; // read the character from the receive buffer
}// getU2
main()
{
char c;
// 1. init the UART2 serial port
initU2();
//KHOI_DONG_LCD();
// 2. prompt
putU2( 'n');
putU2( 't');
// 3. main loop
while ( 1)
{
// 3.1 wait for a character
c = getU2();
// 3.2 echo the character
putU2( c);
//PUTLCD( c );
} // main loop
}// main
#include <p24fj128ga010.h>
_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & COE_OFF & FWDTEN_OFF & ICS_PGx2)
_CONFIG2( FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMOD_HS & FNOSC_PRI)
// I/O definitions for the Explorer16
#define CTS _RF12 // Cleart To Send, input, HW handshake
#define RTS _RF13 // Request To Send, output, HW handshake
#define TRTS TRISFbits.TRISF13 // tris control for RTS pin
// timing and baud rate calculations
#define BRATE 12 // 19200 baud (BREGH=0)
#define U_ENABLE 0x8000 // enable the UART peripheral (BREGH=0)
#define U_TX 0x0400 // enable transmission
// initialize the UART2 serial port
void initU2( void)
{
TRISFbits.TRISF5 = 0;
TRISFbits.TRISF4 = 1;
LATFbits.LATF5 = 1;
U2BRG = BRATE;
U2MODE = U_ENABLE;
U2STA = U_TX;
TRTS = 0; // make RTS output
RTS = 1; // set RTS default status
} // initU2
// send a character to the UART2 serial port
char putU2( char c)
{
//while ( CTS); // wait for !CTS, clear to send
while ( U2STAbits.UTXBF); // wait while Tx buffer full
U2TXREG = c;
return c;
} // putU2
// wait for a new character to arrive to the UART2 serial port
char getU2( void)
{
//RTS = 0; // assert Request To Send !RTS
while ( !U2STAbits.URXDA); // wait for a new character to arrive
//RTS = 1;
return U2RXREG; // read the character from the receive buffer
}// getU2
main()
{
char c;
// 1. init the UART2 serial port
initU2();
//KHOI_DONG_LCD();
// 2. prompt
putU2( 'n');
putU2( 't');
// 3. main loop
while ( 1)
{
// 3.1 wait for a character
c = getU2();
// 3.2 echo the character
putU2( c);
//PUTLCD( c );
} // main loop
}// main