Je souhaite connecter deux kits de démarrage PIC18F (avec PIC18F46J50) en utilisant RS232. Comme USART1 est déjà connecté au lecteur de cartes (intégré), je dois utiliser USART2 (j'ai besoin de remapper RX2/TX2 sur les broches RP19/RP20-RD2/RD3).Connexion de deux kits de démarrage PIC18F en utilisant USART2
Je l'ai déjà trouvé un code de démonstration pour l'envoi:
#define _XTAL_FREQ 8000000 //The speed of your internal(or)external oscillator
#include <p18cxxx.h>
#include <usart.h>
int i = 0;
// CONFIG1L
#pragma config WDTEN = OFF // Watchdog Timer (Disabled - Controlled by SWDTEN bit)
#pragma config PLLDIV =3 // PLL Prescaler Selection bits - Divide by 3 (12 MHz oscillator input)
#pragma config STVREN = ON // Stack Overflow/Underflow Reset (Enabled)
#pragma config XINST = OFF // Extended instruction set disabled
// CONFIG1H
#pragma config CPUDIV = OSC1 // CPU System Clock Postscaler (No CPU system clock divide)
#pragma config CP0 = OFF // Code Protect (Program memory is not code-protected)
// CONFIG2L
#pragma config OSC = HSPLL //HS oscillator, PLL enabled, HSPLL used by USB
#pragma config T1DIG = ON // T1OSCEN Enforcement (Secondary Oscillator clock source may be selected)
#pragma config LPT1OSC = OFF // Low-Power Timer1 Oscillator (High-power operation)
#pragma config FCMEN = OFF //Fail-Safe Clock Monitor disabled
#pragma config IESO = OFF //Two-Speed Start-up disabled
// CONFIG2H
#pragma config WDTPS = 32768 // Watchdog Postscaler (1:32768)
// CONFIG3L
#pragma config DSWDTOSC = INTOSCREF // DSWDT Clock Select (DSWDT uses INTRC)
#pragma config RTCOSC = T1OSCREF // RTCC Clock Select (RTCC uses T1OSC/T1CKI)
#pragma config DSBOREN = OFF // Zero-Power BOR disabled in Deep Sleep
#pragma config DSWDTEN = OFF // Deep Sleep Watchdog Timer (Disabled)
#pragma config DSWDTPS = 8192 //1:8,192 (8.5 seconds)
// CONFIG3H
#pragma config IOL1WAY =OFF //IOLOCK bit can be set and cleared
#pragma config MSSP7B_EN = MSK7 // MSSP address masking (7 Bit address masking mode)
// CONFIG4L
#pragma config WPFP = PAGE_1 // Write/Erase Protect Page Start/End Location (Write Protect Program Flash Page 0)
#pragma config WPEND = PAGE_0 //Start protection at page 0
#pragma config WPCFG = OFF //Write/Erase last page protect Disabled
// CONFIG4H
#pragma config WPDIS = OFF //WPFP[5:0], WPEND, and WPCFG bits ignored
#define USE_AND_MASKS
unsigned char Txdata[] = "MICROCHIP_USART";
void Delay1Second(void);
void main (void)
{
unsigned char spbrg=0,baudconfig=0,i=0;
// REMAPE ID PORT
PPSCON = 0x00; // unlock peripheral Pin select register
RPOR19 = 0x05; // assign USART2 TX to RP19/RD2
RPINR16 = 0x14; // assign USART2 RX to RP20/RD3
PPSCON = 0x01; // lock peripheral Pin select register
TRISDbits.TRISD2 = 0; // TX2 output
TRISDbits.TRISD3 = 1; // RX2 input
//------USART Setup ----
Close2USART(); //turn off usart if was previously on
spbrg = 51;
Open2USART(USART_TX_INT_OFF &
USART_RX_INT_OFF &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH, spbrg);
baudconfig = BAUD_8_BIT_RATE & BAUD_AUTO_OFF;
baud2USART (baudconfig);
PORTB = 0x03;
while(1){
//------USART Transmission ----
while(Busy2USART()); //Check if Usart is busy or not
puts2USART((char *)Txdata); //transmit the string
Delay1Second();
Close2USART();
}
}
void Delay1Second()
{
for(i=0;i<100;i++)
{
__delay_ms(10);
}
}
Je connecté les deux cartes en utilisant deux fils (sur les broches D2 et D3), et je veux envoyer une chaîne de commission1 à board2. Je pense que j'ai besoin d'utiliser des interruptions pour lire, mais je n'ai trouvé aucun code de démo. De plus, je ne sais pas si les broches de configuration sont correctes. Quelqu'un peut-il me montrer comment recevoir le texte envoyé au tableau n ° 2?