PIC24F16KL402开发板使用笔记三: 串口1控制继电器

本程序使用了UART1的发送和接收中断，分享给大家参考希望对大家有一点帮助。下载后，在上位机使用SecureCRT or 串口调试助手调试效果很好，很稳定。

#include "xc.h"
//#include <string.h>
#include <stdlib.h>
_FBS
(
BWRP_OFF & // Boot Segment Write Protect (Disabled)
BSS_OFF // Boot segment Protect (No boot flash segment)
)
//_FGS
//(
// GWRP_OFF & // General Segment Flash Write Protect (General segment may be written)
// GSS0_OFF // General Segment Code Protect (No Protection)
//)
_FOSCSEL
(
FNOSC_FRC & // Oscillator Select (8MHz FRC with Postscaler (FRCDIV))
// SOSCSRC_ANA & // SOSC Source Type (Analog Mode for use with crystal)
// LPRCSEL_HP & // LPRC Power and Accuracy (High Power/High Accuracy)
IESO_ON // Internal External Switch Over bit (Internal External Switchover mode enabled (Two-speed Start-up enabled))
)
_FOSC
(
// POSCMD_HS & // Primary Oscillator Mode (Primary oscillator disabled)
OSCIOFNC_ON & // CLKO Enable Configuration bit (CLKO output signal enabled)
POSCFREQ_MS & // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock frequency between 100kHz to 8MHz)
SOSCSEL_SOSCHP &// SOSC Power Selection Configuration bits (Secondary Oscillator configured for high-power operation)
FCKSM_CSECME // Clock Switching and Monitor Selection (Clock Switching and Fail-safe Clock Monitor Enabled)
)
_FWDT
(
WDTPS_PS32768 & // Watchdog Timer Postscale Select bits (1:32768)
FWPSA_PR128 & // WDT Prescaler bit (WDT prescaler ratio of 1:128)
FWDTEN_OFF & // Watchdog Timer Enable bits (WDT disabled in hardware; SWDTEN bit disabled)
WINDIS_OFF // Windowed Watchdog Timer Disable bit (Standard WDT selected (windowed WDT disabled))
)
// Warning:
// Always enable MCLRE_ON config bit setting so that the MCLR pin function will
// work for low-voltage In-Circuit Serial Programming (ICSP). The Microstick
// programming circuitry only supports low-voltage ICSP. If you disable MCLR pin
// functionality, a high-voltage ICSP tool will be required to re-program the
// part in the future.
_FPOR
(
BOREN_BOR3 & // Brown-out Reset Enable bits (Enabled in hardware; SBOREN bit disabled)
PWRTEN_ON & // Power-up Timer Enable (PWRT enabled)
I2C1SEL_PRI & // Alternate I2C1 Pin Mapping bit (Default SCL1/SDA1 Pins for I2C1)
BORV_V18 & // Brown-out Reset Voltage bits (Brown-out Reset at 1.8V)
MCLRE_ON // MCLR Pin Enable bit (RA5 input disabled; MCLR enabled)
)
_FICD
(
ICS_PGx3 // ICD Pin Placement Select (EMUC/EMUD share PGC3/PGD3)
)
#define FP 4000000
#define BAUDRATE 9600
#define BRGVAL ((FP/BAUDRATE)/16) - 1
char ReceivedChar;
void delay(unsigned int uiCnt)
{
int i,j;
for(i=0;i<uiCnt;i++)
for(j=0;j<110;j++);
}
int main(void)
{
TRISAbits.TRISA0 = 0;
TRISAbits.TRISA1 = 0;
TRISAbits.TRISA2 = 0;
TRISAbits.TRISA3 = 0;
TRISBbits.TRISB3 = 0;
ANSBbits.ANSB2 = 0;
TRISBbits.TRISB2 = 1;
U1MODEbits.UARTEN = 0;
U1MODEbits.UEN0 = 0;
U1MODEbits.UEN1 = 0;
U1MODEbits.STSEL = 0; // 1-stop bit
U1MODEbits.PDSEL = 0; // No Parity, 8-data bits
U1MODEbits.ABAUD = 0; // Auto-Baud disabled
U1MODEbits.BRGH = 0; // Standard-Speed mode
U1BRG = BRGVAL;
//U1BRG = 103;
U1STAbits.URXISEL = 0; // Interrupt after one RX character is received;
U1STAbits.UTXISEL0 = 0;
U1STAbits.UTXISEL1 = 0;
U1STAbits.URXISEL0 = 1;
U1STAbits.URXISEL1 = 1;
IEC0bits.U1TXIE = 1;
IFS0bits.U1TXIF = 1;
IEC0bits.U1RXIE = 1;
IFS0bits.U1RXIF = 1;
U1MODEbits.UARTEN = 1; // Enable UART
U1STAbits.UTXEN = 1;
U1TXREG = 'H';
while(1)
{
delay(100);
LATAbits.LATA0 ^= 1;
//PORTB3接一个继电器
switch(ReceivedChar)
{
case 'o':
LATBbits.LATB3 = 1;
break;
case 'p':
LATBbits.LATB3 = 0;
break;
}
}
}
void __attribute__((interrupt, shadow, no_auto_psv)) _U1TXInterrupt(void)
{
IFS0bits.U1TXIF = 0; // Clear TX Interrupt flag
//U1TXREG = 'a'; // Transmit one character
}
void __attribute__((interrupt, shadow, no_auto_psv)) _U1RXInterrupt(void)
{
IFS0bits.U1RXIF = 0; // Clear TX Interrupt flag
//U1TXREG = 'a'; // Transmit one character
LATBbits.LATB3 ^= 1;
/* Get the data */
if(U1STAbits.URXDA == 1)
{
ReceivedChar = U1RXREG;
U1TXREG = ReceivedChar;
}
}