我是为8位图片编写固件的新手,可以在我的代码上使用一些帮助。我正在使用PIC16F1829用于获取RX命令的LED模块。我只是想在RX PIN上收到某个值时,尝试获得基础设置,例如打开LED,但甚至无法得到。
想让UART通过中断工作,但甚至无法与主循环中的民意调查一起使用。我的中断向量在下面的代码中评论。
rx pin:rc5
TX PIN:RB7
引脚打开和关闭LED:RA5
引脚RA5可以很好地打开和关闭LED。TX PIN正在起作用,尽管我尚未确认Interrupt TXIF是否也无法像RCIF不起作用。
我尝试阅读RCIF和PIR1BITS.RCIF。他们俩都编译了。没有人工作。我在两个不同的LED模块上尝试了两张不同的图片。他们打开,但阅读RX PIN也没有起作用。
可变RXIN最初定义为3,因此由于RXIN - 在主环内的循环循环亮点在启动时闪光3次,因此我知道它正在进入主环。但是据我所知,RCIF中断在RX PIN处接收时不会发射。
我已经在示波器上证实了使用相同的baud进入RX并从TX引脚出来的信号,因此我认为波特率是正确配置的(300 baud,8n1。)我还在示波器RX引脚上确认了强且清洁的5V信号。到目前为止,投票RCIF或使用中断服务路由都没有奏效。如果有人可以看到我没有看到的代码问题,那么您的帮助将不胜感激。
我的代码:
#include <stdio.h>
#include <stdlib.h>
#include <xc.h>
// This is for 300 baud rate
#define _BAUD_PRESCALER_LOW_ 0x2A
#define _BAUD_PRESCALER_HIGH_ 0x68
#define _XTAL_FREQ 32000000
#pragma config FOSC = INTOSC // Oscillator Selection->INTOSC oscillator: I/O function on CLKIN pin
#pragma config WDTE = OFF // Watchdog Timer Enable->WDT enabled
#pragma config PWRTE = OFF // Power-up Timer Enable->PWRT disabled
#pragma config MCLRE = OFF // MCLR Pin Function Select->MCLR/VPP pin function is digital input
#pragma config CP = OFF // Flash Program Memory Code Protection->Program memory code protection is disabled
#pragma config CPD = OFF // Data Memory Code Protection->Data memory code protection is disabled
#pragma config BOREN = ON // Brown-out Reset Enable->Brown-out Reset enabled
#pragma config CLKOUTEN = OFF // Clock Out Enable->CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin
#pragma config IESO = OFF // Internal/External Switchover->Internal/External Switchover mode is disabled
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable->Fail-Safe Clock Monitor is disabled
// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection->Write protection off
#pragma config PLLEN = ON // PLL Enable->4x PLL enabled
#pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable->Stack Overflow or Underflow will cause a Reset
#pragma config BORV = LO // Brown-out Reset Voltage Selection->Brown-out Reset Voltage (Vbor), low trip point selected.
#pragma config LVP = OFF
int flagRXFramingError = 0;
int flagRXOverrunError = 0;
volatile unsigned char RXIN = 3;
unsigned char UARTRead(){
return RCREG;
}
void writeRXIN(unsigned char a){
RXIN = a;
}
void TX(unsigned char a){
while(!TXIF){}
TXREG = a;
}
int main(int argc, char** argv) {
// SCS FOSC; SPLLEN disabled; IRCF 8MHz_HF;
OSCCON = 0xF0;
// TUN 0;
OSCTUNE = 0x00;
// Set the secondary oscillator
// Wait for PLL to stabilize
while(PLLR == 0)
{
}
// WDTPS 1:65536; SWDTEN OFF;
WDTCON = 0x16;
__delay_ms(5);
GIE = 1; // Global interrupts enabled
__delay_ms(5);
PEIE = 1; // Active peripheral interrupts enabled
__delay_ms(5);
RCIE = 1; // Enable USART Receive interrupt
__delay_ms(5);
TXIE = 1; // Enable USART Transmitter interrupt
__delay_ms(5);
ADIE = 1; // Enable ADC interrupts
__delay_ms(5);
RXDTSEL = 0; // RX is on RC5 pin
__delay_ms(5);
TXCKSEL = 0; // TX is on RB7 pin
__delay_ms(5);
TRISC5 = 1; // RX pin set as input
__delay_ms(5);
SPEN = 1; // Serial Port Enabled
__delay_ms(5);
SYNC = 0; // Asynchronous mode
__delay_ms(5);
RX9 = 0; // 8 bit reception
__delay_ms(5);
TX9 = 0; // 8-bit transmission
__delay_ms(5);
CREN = 1; // Receiver enabled
__delay_ms(5);
TXEN = 1; // Transmitter enabled
__delay_ms(5);
BRG16 = 1; // 16-bit baud generation
__delay_ms(5);
BRGH = 1; // High baud rate enabled
__delay_ms(5);
ABDEN = 0; // Auto baud detect disabled
__delay_ms(5);
// Baud prescaler n = [Fosc/(D*BR)] - 1
SPBRGH = _BAUD_PRESCALER_HIGH_;
__delay_ms(5);
SPBRGL = _BAUD_PRESCALER_LOW_;
__delay_ms(5);
TRISC6 = 0; // IadjPWM pin configured as output
__delay_ms(5);
ANSC6 = 0; // IadjPWM pin not analog input
__delay_ms(5);
TRISA5 = 0; // DimPWM pin configured as output
__delay_ms(5);
LATC6 = 1; // Max current for now until PWM written
__delay_ms(5);
while(1){
// Inline assembly code to clear watchdog timer
//asm("CLRWDT");
/*if(RXIN == 5){
RA5 = 1;
}
else{
RA5 = 0;
}*/
if(PIR1bits.RCIF){
writeRXIN(UARTRead());
//RA5 = 0;
TX(RXIN);
} // end if RCIF
while(RXIN > 0){
RA5 = 1;
__delay_ms(100);
RA5 = 0;
__delay_ms(100);
RXIN--;
}
}
// infinite loop
// never leave this loop
RA5 = 1;
return (EXIT_SUCCESS);
} // end main
/*void interrupt ISR(void){
if(RCIF){// if USART Receive interrupt flag
RA5 = 1;
if(FERR){
flagRXFramingError = 1;
SPEN = 0;
SPEN = 1;
}
if(OERR){
flagRXOverrunError = 1;
CREN = 0;
CREN = 1;
}
while(RCIF){ // RCIF high as long as there is data in FIFO register. Read RCREG to clear RCIF flag
writeRXIN(UARTRead());
}
RA5 = 0;
}
if (TXIF){// if USART Transmit interrupt
TXIF = 0; // Clear interrupt flag
}
} // end ISRs*/
如果有某种错误,有些微控制器停止接收字节。确保清除这些错误。通常通过清除一些UART控制寄存器位。
解决了问题
我不确定问题到底是什么解决了问题,但我将分享我所做的重大更改和新代码。
-
我启用了Txie。txif几乎总是很高,因此生成连续中断。我看不出启用TX中断的原因,虽然可能有一个好的。如果您想tx等到txif是不是零和传输,否则为什么要使用标志?
-
我的中断是错误的顺序。我应该启用了外围设备,然后他们的个人中断必要的,然后是peie,最后是Gie。
-
我没有在我的中断中处理费尔和oerr发射并引起中断。
我的原始代码中也有错误的rxdtsel设置。这是新的工作代码。目前,它所做的就是回应RX信号,并眨眼LED的次数。
#include <stdio.h>
#include <stdlib.h>
#include <xc.h>
// This is for 300 baud rate
#define _BAUD_PRESCALER_LOW_ 0x2A
#define _BAUD_PRESCALER_HIGH_ 0x68
#define _XTAL_FREQ 32000000
#define _PIN_DIMPWMPIN_ RA5
#pragma config FOSC = INTOSC // Oscillator Selection->INTOSC oscillator: I/O function on CLKIN pin
#pragma config WDTE = OFF // Watchdog Timer Enable->WDT enabled
#pragma config PWRTE = OFF // Power-up Timer Enable->PWRT disabled
#pragma config MCLRE = OFF // MCLR Pin Function Select->MCLR/VPP pin function is digital input
#pragma config CP = OFF // Flash Program Memory Code Protection->Program memory code protection is disabled
#pragma config CPD = OFF // Data Memory Code Protection->Data memory code protection is disabled
#pragma config BOREN = ON // Brown-out Reset Enable->Brown-out Reset enabled
#pragma config CLKOUTEN = OFF // Clock Out Enable->CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin
#pragma config IESO = OFF // Internal/External Switchover->Internal/External Switchover mode is disabled
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable->Fail-Safe Clock Monitor is disabled
// CONFIG2
#pragma config WRT = OFF // Flash Memory Self-Write Protection->Write protection off
#pragma config PLLEN = ON // PLL Enable->4x PLL enabled
#pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable->Stack Overflow or Underflow will cause a Reset
#pragma config BORV = LO // Brown-out Reset Voltage Selection->Brown-out Reset Voltage (Vbor), low trip point selected.
#pragma config LVP = OFF
int flagRXFramingError = 0;
int flagRXOverrunError = 0;
volatile unsigned char RXIN = 3;
unsigned char RX(){
return RCREG;
}
void writeRXIN(volatile unsigned char a){
RXIN = a;
}
void TX(unsigned char a){
while(!PIR1bits.TXIF); // TXIF is usually 1, only 0 when busy transmitting
TXREG = a;
}
int main(int argc, char** argv) {
// SCS FOSC; SPLLEN disabled; IRCF 8MHz_HF;
OSCCON = 0xF0;
// TUN 0;
OSCTUNE = 0x00;
// Set the secondary oscillator
// Wait for PLL to stabilize
while(OSCSTATbits.PLLR == 0){}
ADCON0bits.ADON = 0;
ANSELA = 0x00;
ANSELB = 0x00;
ANSELC = 0x00;
PIE1bits.ADIE = 0; // Disable ADC interrupts
TRISCbits.TRISC5 = 1; // RX pin set to input
TRISCbits.TRISC6 = 0; // IadjPWM pin configured as output
TRISAbits.TRISA5 = 0; // DimPWM pin configured as output
LATCbits.LATC6 = 1; // Max current for now until PWM written
//UART Init
BAUDCONbits.BRG16 = 1; // 16-bit baud generation
TXSTAbits.BRGH = 1; // High baud rate enabled
BAUDCONbits.ABDEN = 0; // Auto baud detect disabled
// Baud prescaler n = [Fosc/(D*BR)] - 1
SPBRGH = _BAUD_PRESCALER_HIGH_;
__delay_ms(1);
SPBRGL = _BAUD_PRESCALER_LOW_;
__delay_ms(1);
APFCON0bits.RXDTSEL = 1; // RX is on RC5 pin
APFCON0bits.TXCKSEL = 0; // TX is on RB7 pin
TXSTAbits.SYNC = 0; // Asynchronous mode
RCSTAbits.SPEN = 1; // Serial Port Enabled
RCSTAbits.RX9 = 0; // 8 bit reception
TXSTAbits.TX9 = 0; // 8-bit transmission
RCSTAbits.CREN = 1; // Receiver enabled
TXSTAbits.TXEN = 1; // Transmitter enabled
PIE1bits.TXIE = 0; // Enable USART Transmitter interrupt
PIE1bits.RCIE = 1; // Enable USART Receive interrupt
while(PIR1bits.RCIF){
writeRXIN(RX());
}
INTCONbits.PEIE = 1; // Enable peripheral interrupts
INTCONbits.GIE = 1; // Enable global interrupts
while(1){
while(RXIN > 0){
TX(RXIN);
_PIN_DIMPWMPIN_ = 1;
__delay_ms(100);
_PIN_DIMPWMPIN_ = 0;
__delay_ms(100);
RXIN--;
}
}
// infinite loop
// never leave this loop
return (EXIT_SUCCESS);
} // end main
void interrupt ISR(void){
if(PIE1bits.RCIE && PIR1bits.RCIF){ // handle RX pin interrupts
while(PIR1bits.RCIF){
writeRXIN(RX());
}
if(RCSTAbits.FERR){
flagRXFramingError = 1;
SPEN = 0;
SPEN = 1;
}
if(RCSTAbits.OERR){
flagRXOverrunError = 1;
CREN = 0;
CREN = 1;
}
} // end RX pin interrupt handlers
} // end ISRs*/