5 ds18b20传感器只返回255
5 ds18b20传感器只返回255
提问于 2022-09-29 12:28:12
我正在研制一台pic18f67k22，试着让5 DS18B20温度传感器工作。第一个4会很好地读取温度，无论我给出的传感器值为4(或更高)，读取温度时只返回255秒。这意味着硬件是好的，我们也可以读取日航的每一个传感器，只是不能用C。
我和我的同事们无法理解什么可能会导致这个问题。由于这个原因，我会先道歉，但这将是一个代码转储。
main.c:(main.h不包含任何内容)
/*
* File: main.c
* Author: Wesley
*
* Created on September 6, 2022, 9:17 AM
*/
#include "fuses.h"
#include <stdbool.h>
#include <stdio.h>
#include <xc.h>
#include "clock.h"
#include "co2.h"
#include "delay.h"
#include "exti.h"
#include "i2c_drv.h"
#include "interrupt.h"
#include "LCDSerialTerminalMaster.h"
#include "onewire.h"
#include "pin.h"
#include "pwm.h"
#include "sim800.h"
#include "tempsensors.h"
#include "uart1.h"
uint8_t prevSec = 0;
void main(void)
{
// disable comparators
CM1CONbits.CON = 0;
CM2CONbits.CON = 0;
CM3CONbits.CON = 0;
// disable analog input
ADCON0bits.ADON = false;
ANCON0 = 0;
ANCON1 = 0;
ANCON2 = 0;
// turn 3v3 on to enable peripherals
POWER_PIN_DIR = OUTPUT;
POWER_PIN_OUT = LOW;
INT_Init();
UART1_Init();
printf("_____START_____\r\n");
I2C_Init();
CLK_Init();
LCD_Init();
TEMP_Init();
//SIM800_Init();//doesn't work, not receiving enough power consistently
//needs to move to UI_Init
CCP6CONbits.CCP6M = 0b1100; //PWM mode, single output for UI LEDs
PWM_SetLed(255);
printf("_____INIT DONE_____\r\n");
while(1)
{
if(CLK_GetSec() != prevSec)
{
prevSec = CLK_GetSec();
EXTI_Main(0);
//SIM800_Main();//doesn't work, not receiving enough power consistently
//CO2_Main();//all but scd30 get detected
TEMP_Main();//doesn't work, last sensor(whichever gets highest value) always returns as not attached
EXTI_Main(1);
EXTI_Main(2);
LCD_Write();
EXTI_Main(3);
EXTI_Main(4);
}
}
}clock.c:(clock.h只包含原型)
/*
* File: clock.c
* Author: Wesley
*
* Created on September 13, 2022, 2:10 PM
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <xc.h>
static uint8_t hour = 0;
static uint8_t min = 0;
static uint8_t sec = 0;
static volatile uint16_t ms = 0;
void CLK_Init(void)
{
T3CONbits.TMR3CS = 0b00; // Source = Fosc/4
T3CONbits.SOSCEN = 0b1; // SOSC disabled
T3CONbits.T3CKPS = 0b00; // Prescaler 1:1
CCP4CONbits.CCP4M = 0b1011; // Compare Mode: Special Event Trigger, reset TMR3 on CCP4 match
CCPTMRS1bits.C4TSEL = 0b01; // TMR3/TMR4
// set compare value to 5000
CCPR4L = 136;
CCPR4H = 19;
// Disable TMR3 interrupt.
PIE2bits.TMR3IE = 0;
// clear CCP4 interrupt.
PIR4bits.CCP4IF = 0;
// enable CCP4 interrupt.
PIE4bits.CCP4IE = 1;
IPR4bits.CCP4IP = 1;
// Start the Timer by writing to TMRxON bit.
T3CONbits.TMR3ON = 1;
}
void CLK_SetTime(uint8_t s, uint8_t m, uint8_t h)
{
sec = s;
min = m;
hour = h;
}
void CLK_GetTime(char *buffer)
{
sprintf(buffer, "%02hhu:%02hhu:%02hhu", hour, min, sec);
}
uint8_t CLK_GetSec(void)
{
return sec;
}
uint16_t CLK_GetMs(void)
{
return ms;
}
void CLK_ISR(void)
{
PIR4bits.CCP4IF = 0;
ms++;
if(ms == 1000)
{
ms = 0;
sec++;
if(sec == 60)
{
sec = 0;
min++;
if(min == 60)
{
min = 0;
hour++;
if(hour == 24)
hour = 0;
}
}
}
}delay.c(delay.h只包含原型)
/*
* File: delay.c
* Author: Wesley
*
* Created on March 7, 2022, 1:08 PM
*/
#include "delay.h"
void Delay1us()
{
//__asm("nop");//just the function call seems to be enough delay
}
void Delay2us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay3us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n");
}
void Delay4us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay5us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay6us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay7us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay8us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay9us()
{
__asm(
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
);
}
void Delay10us(uint16_t amount)
{
for (uint16_t i = 1; i < amount; i++)
{
Delay7us();
__asm(
"nop\n"
"nop\n"
);
}
Delay4us();
__asm(
"nop\n"
);
}
void Delay1ms(uint16_t amount)
{
for (uint16_t i = 1; i < amount; i++)
Delay10us(99);
Delay10us(98);
}fuses.h：
/*
* File: config.h
* Author: wesley
*
* Created on 6 september 2022, 10:11
*/
#ifndef FUSES_H
#define FUSES_H
// CONFIG1L
#pragma config SOSCSEL = DIG // digital i/o on pin_c0 & pin_c1
#pragma config XINST = OFF // Extended Instruction Set (Disabled)
// CONFIG1H
#pragma config FOSC = HS2 //external oscillator
// CONFIG2L
// CONFIG2H
#pragma config WDTEN = OFF // no watchdog
// CONFIG3L
#pragma config RTCOSC = INTOSCREF // rtcc uses internal oscillator
// CONFIG3H
#pragma config MCLRE = OFF // reset externally
// CONFIG4L
#pragma config DEBUG = OFF // no debugging
// CONFIG5L
// CONFIG5H
// CONFIG6L
// CONFIG6H
// CONFIG7L
// CONFIG7H
#include <xc.h>
#endif /* FUSES_H */C：(interintert.h只包含原型)
/*
* File: interrupt.c
* Author: Wesley
*
* Created on September 6, 2022, 6:41 PM
*/
#include <stdbool.h>
#include "interrupt.h"
#include "clock.h"
//#include "i2c_drv.h"
#include "pin.h"
#include "uart1.h"
void INT_Init(void)
{
// Enable Interrupt Priority Vectors
IPEN = 1;
// RCI - high priority
UART2_RC_IP = 1;
UART2_TX_IP = 0;
MASTER_SYNC_IP = 1;
INT_Toggle(true);
}
void INT_Toggle(bool toggle)
{
INT_ToggleHigh(toggle);
INT_ToggleLow(toggle);
}
void INT_ToggleHigh(bool toggle)
{
INTCONbits.GIEH = toggle;
}
void INT_ToggleLow(bool toggle)
{
INTCONbits.GIEL = toggle;
}
void __interrupt(high_priority) INT_InterruptManagerHigh(void)
{
if(PIR4bits.CCP4IF)
CLK_ISR();
if(UART1_RC_IF)
UART1_RC_ISR();
}
void __interrupt(low_priority) INT_InterruptManager(void)
{
}C：(onewire.h只包含原型)
/*
* File: onewire.c
* Author: Wesley
*
* Created on September 21, 2022, 4:57 PM
*/
#include <stdbool.h>
#include "delay.h"
#include "interrupt.h"
#include "tempsensors.h"
#include "pin.h"
//debug
#include "uart1.h"
static bool GetPin(TEMP_sensor_t sensor)
{
switch(sensor)
{
case T1:
return T1_IN;
case T2:
return T2_IN;
case T3:
return T3_IN;
case T4:
return T4_IN;
case T5:
return T5_IN;
default://suppresses warning
return false;
}
}
static void SetDir(TEMP_sensor_t sensor, bool value)
{
switch(sensor)
{
case T1:
T1_DIR = value;
break;
case T2:
T2_DIR = value;
break;
case T3:
T3_DIR = value;
break;
case T4:
T4_DIR = value;
break;
case T5:
T5_DIR = value;
break;
default://suppresses warning
break;
}
}
static void SetLat(TEMP_sensor_t sensor, bool value)
{
switch(sensor)
{
case T1:
T1_OUT = value;
break;
case T2:
T2_OUT = value;
break;
case T3:
T3_OUT = value;
break;
case T4:
T4_OUT = value;
break;
case T5:
T5_OUT = value;
break;
default://suppresses warning
break;
}
}
static void SetPin(TEMP_sensor_t sensor, bool value)
{
switch(sensor)
{
case T1:
T1_IN = value;
break;
case T2:
T2_IN = value;
break;
case T3:
T3_IN = value;
break;
case T4:
T4_IN = value;
break;
case T5:
T5_IN = value;
break;
default://suppresses warning
break;
}
}
void OW_WriteBit(TEMP_sensor_t sensor , bool data)
{
INT_Toggle(false);
SetLat(sensor, LOW);
SetDir(sensor, OUTPUT);
Delay10us(1);
if(data)
SetDir(sensor, INPUT);
Delay10us(8);
SetDir(sensor, INPUT);
Delay10us(1);
INT_Toggle(true);
}
void OW_ReadBit(TEMP_sensor_t sensor, uint8_t *output)
{
INT_Toggle(false);
SetLat(sensor, LOW);
SetDir(sensor, OUTPUT);
Delay10us(1);
SetDir(sensor, INPUT);
Delay10us(1);
*output = GetPin(sensor);
Delay10us(7);
INT_Toggle(true);
}
void OW_WriteByte(TEMP_sensor_t sensor, uint8_t data)
{
for(uint8_t i = 0; i < 8; i++)
{
OW_WriteBit(sensor, data & 1);
data >>= 1;
}
SetLat(sensor, HIGH);
SetDir(sensor, OUTPUT);
}
void OW_ReadByte(TEMP_sensor_t sensor, uint8_t *output)
{
uint8_t b;//bit
for(uint8_t i = 0; i < 8; i++)
{
*output >>= 1;
OW_ReadBit(sensor, &b);
*output += b << 7;
}
SetLat(sensor, HIGH);
SetDir(sensor, OUTPUT);
}
void OW_Reset(TEMP_sensor_t sensor)
{
SetLat(sensor, LOW);
SetDir(sensor, OUTPUT);
Delay10us(70);
SetDir(sensor, INPUT);
Delay10us(70);
}H(pin.c不存在)
/*
* File: pin.h
* Author: Wesley
*
* Created on September 6, 2022, 1:00 PM
*
*
*
* PIC18F67K22 pin connections
* nr pin function signal name
* 1 RE1/!WR/P2C io MUX_A_DIR serial multiplexer address 2
* 2 RE0/!RD/P2D io MUX_B_DIR serial multiplexer address 1
* 3 RG0/ECCP3/P3A io SPARE7 to spare connector
* 4 RG1/TX2/CK2 io WF_RX wifi UART receive
* 5 RG2/RX2/DT2 io WF_TX wifi UART transmit
* 6 RG3/CCP4/P3D io BUZZER buzzer via CCP4
* 7 !MCLR in !MCLR reset
* 8 RG4/CCP5/T7CKI io RPM_FAN2 fan RPM VIA TMR7
* 9 VSS pwr GND GND
* 10 VDDCORE/VCAP pwr VDD_CORE to capacitor
* 11 RF7/!SS1 io SEND/!REC send_rec to ADM3493, RS485
* 12 RF6/AN11 io LEDS green/red LEDs
* 13 RF5/AN10/CVREF io SPARE5 to spare connector
* 14 RF4/AN9 io SPARE3 to spare connector
* 15 RF3/AN8 io SPARE4 to spare connector
* 16 RF2/AN7/C1OUT io SPARE6 to spare connector
* 17 RF1/AN6/C2OUT io SPARE9 to spare connector
* 18 ENVREG in +5V +5V
* 19 AVDD pwr +5V +5V
* 20 AVSS pwr GND GND
* 21 RA3/AN3/VREF+ io SPARE8 to spare connector
* 22 RA2/AN2/VREF- io DS18B20_T5 DS18B20 sensor 5, aka T2A
* 23 RA1/AN1 io DS18B20_T4 DS18B20 sensor 4
* 24 RA0/AN0 io SPARE10 to spare connector
* 25 VSS pwr GND GND
* 26 VDD pwr +5V +5V
* 27 RA5/AN4 io DS18B20_T1 DS18B20 sensor 1
* 28 RA4/T0CK io DS18B20_T3 DS18B20 sensor 3
* 29 RC1/T1OSI/ECCP2/P2A io PWM_FAN1 PWM fan 1 via ECCP2
* 30 RC0/T1OSO/T13CKI io DS18B20_T2 DS18B20 sensor 2
* 31 RC6/TX1/CK1 io MUX_RX mux UART transmit
* 32 RC7/RX1/DT1 io MUX_TX mux UART receive
* 33 RC2/ECCP1/P1A io PWM_FAN2 PWM fan 2 via ECCP1
* 34 RC3/SCK1/SCL1 io SCL I2C
* 35 RC4/SDI1/SDA1 io SDA I2C
* 36 RC5/SDO1 io COUPLE_CHECK resistance measurement thermocouple
* 37 RB7/KBI2/PGD io PGD ICSP
* 38 VDD pwr +5V +5V
* 39 OSC1/CLKI in OSC1 20 Mhz crystal
* 40 OSC2/CLKO out OSC2 20 Mhz crystal
* 41 VSS pwr GND GND
* 42 RB6/KBI2/PGC io PGC ICSP
* 43 RB5/KBI1 io STERM LCD and keyboard
* 44 RB4/KBI0 io HEAT_ to heater triac optocoupler
* 45 RB3/INT3 io RELAY powers heater
* 46 RB2/INT2 io ZERO_CROSS 230V AC zero cross timing
* 47 RB1/INT1 io TRIAC_CHECK heater voltage
* 48 RB0/INT0/FLT0 io RF_DATA incoming 433 Mhz remote control
* 49 RD7/PSP7/!SS2 io UI19 auto button
* 50 RD6/PSP6/SCK2/SCL2 io UI_SCK UI LEDs clock
* 51 RD5/PSP5/SDI2/SDA2 io SPARE11 not used
* 52 RD4/PSP4/SDO2 io UI_DATA UI LEDs data
* 53 RD3/PSP3 io SPARE12 not used
* 54 RD2/PSP2 io SPARE14 not used
* 55 RD1/PSP1/T5CKI io RPM_FAN1 fan RPM VIA TMR5
* 56 VSS pwr GND GND
* 57 VDD pwr +5V +5V
* 58 RD0/PSP0 io !POWER_SENSORS MAX893 sensor power cycle
* 59 RE7/ECCP2/P2A io !FAULT MAX893 overcurrent
* 60 RE6/P1B io UI_PWM UI LEDs brightness via CCP6
* 61 RE5/P1C io SIM800_POW SIM800 power cycle
* 62 RE4/P3B io WF_RESET ESP32 AP mode
* 63 RE3/P3C io UI5 UI flowmin button
* 64 RE2/!CS/P2B io UI3 UI flowplus button
*/
#ifndef PIN_H
#define PIN_H
#include <xc.h>
#define OUTPUT 0
#define INPUT 1
#define LOW 0
#define HIGH 1
//FAN
#define FAN1_IN PORTDbits.RD1
#define FAN1_DIR TRISDbits.TRISD1
#define FAN1_PWM CCPR2L
#define FAN1_PWM_IN PORTCbits.RC1
#define FAN1_PWM_OUT LATCbits.LC1
#define FAN1_PWM_DIR TRISCbits.TRISC1
#define FAN2_IN PORTGbits.RG4
#define FAN2_DIR TRISGbits.TRISG4
#define FAN2_PWM CCPR1L
#define FAN2_PWM_IN PORTCbits.RC2
#define FAN2_PWM_OUT LATCbits.LC2
#define FAN2_PWM_DIR TRISCbits.TRISC2
//INTERRUPT
#define IPEN RCONbits.IPEN
#define MASTER_SYNC_IP IPR1bits.SSP1IP
#define RTC_IF PIR3bits.RTCCIF
#define RTC_IP IPR3bits.RTCCIP
#define UART2_RC_IF PIR3bits.RC2IF
#define UART2_RC_IP IPR3bits.TX2IP
#define UART2_TX_IF PIR3bits.RC2IF
#define UART2_TX_IP IPR3bits.TX2IP
//LCD
#define LCD_PIN_DIR TRISBbits.TRISB5
#define LCD_PIN_OUT LATBbits.LB5
#define LCD_PIN_IN PORTBbits.RB5
//MAIN
#define LED_DIM CCPR6L
//ICSP
#define PGC PORTBbits.RB6
#define PGC_DIR TRISBbits.TRISB6
#define PGD PORTBbits.RB7
#define PGD_DIR TRISBbits.TRISB7
//ONEWIRE
#define T1_IN PORTAbits.RA5
#define T1_OUT LATAbits.LA5
#define T1_DIR TRISAbits.TRISA5
#define T2_IN PORTCbits.RC0
#define T2_OUT LATCbits.LC0
#define T2_DIR TRISCbits.TRISC0
#define T3_IN PORTAbits.RA4
#define T3_OUT LATAbits.LA4
#define T3_DIR TRISAbits.TRISA4
#define T4_IN PORTAbits.RA1
#define T4_OUT LATAbits.LA1
#define T4_DIR TRISAbits.TRISA1
#define T5_IN PORTAbits.RA2
#define T5_OUT LATAbits.LA2
#define T5_DIR TRISAbits.TRISA2
//PIEZO
#define BEEP_IN PORTGbits.RG3
#define BEEP_DIR TRISGbits.TRISG3
//POWER
#define POWER_IN PORTDbits.RD0
#define POWER_PIN_DIR TRISDbits.TRISD0
#define POWER_PIN_OUT LATDbits.LD0
//RF
#define RF_IN PORTBbits.RB0
#define RF_DIR TRISBbits.TRISB0
//RTC
#define RTC_IE PIE3bits.RTCCIE
//SIM
#define SIM_POWER PORTEbits.RE5
#define SIM_POWER_OUT LATEbits.LE5
#define SIM_POWER_DIR TRISEbits.TRISE5
//TEMP
//TCPL
#define TCPL_CHECK PORTCbits.RC5
#define TCPL_CHECK_DIR TRISCbits.TRISC5
//UART1
#define MUX_A LATEbits.LE1
#define MUX_A_DIR TRISEbits.TRISE1
#define MUX_B LATEbits.LE0
#define MUX_B_DIR TRISEbits.TRISE0
#define MUX_RC_DIR TRISCbits.TRISC6
#define MUX_TX_DIR TRISCbits.TRISC7
#define SEND_REC LATFbits.LF7
#define SEND_REC_DIR TRISFbits.TRISF7
#define UART1_RC_IE PIE1bits.RC1IE
#define UART1_RC_IF PIR1bits.RC1IF
#define UART1_RC_IP IPR1bits.RC1IP
#define UART1_TX_IF PIR1bits.TX1IF
#define UART1_TX_IP IPR1bits.TX1IP
//UART2
#define WF_RESET PORTEbits.RE4
#define WF_RESET_DIR TRISEbits.TRISE4
#define WF_RC PORTGbits.RG1
#define WF_RC_DIR TRISGbits.TRISG1
#define WF_TX PORTGbits.RG2
#define WF_TX_DIR TRISGbits.TRISG2
#define UART2_RC_IE PIE3bits.RC2IE
#define UART2_TX_IDLE TXSTA2bits.TRMT
#endif /* PIN_H */诱惑力c：
/*
* File: tempsensors.c
* Author: Wesley
*
* Created on September 21, 2022, 4:40 PM
*/
#include <stdbool.h>
#include <stdint.h>
#include "onewire.h"
#include "pin.h"
#include "tempsensors.h"
//debug
#include "uart1.h"
static uint8_t scratchpad[TEMP_SENSOR_AMOUNT][9];
static int16_t value[TEMP_SENSOR_AMOUNT];
static bool reading = true;
//static uint8_t crc8(uint8_t* data, uint8_t len)
//{
// uint8_t crc = 0;
// while (len--)
// {
// uint8_t inbyte = *data++;
// for (uint8_t i = 8; i; i--)
// {
// uint8_t mix = (crc ^ inbyte) & 0x01;
// crc >>= 1;
// if (mix) crc ^= 0x8C;
// inbyte >>= 1;
// }
// }
// return crc;
//}
//BytesToRead == 8 = read ROM ID
//BytesToRead == 9 = read hw scratchpad
static void Read(uint8_t sensor, uint8_t BytesToRead)
{
// read a number of bytes and calculate the CRC value of
// the complete group
for(uint8_t i = 0; i < BytesToRead; i++)
OW_ReadByte(sensor, &scratchpad[sensor][i]);
if(BytesToRead == 9 && scratchpad[sensor][4] == 0xFF && scratchpad[sensor][5] == 0xFF &&
scratchpad[sensor][6] == 0xFF && scratchpad[sensor][7] == 0xFF && scratchpad[sensor][8] == 0xFF)
{
printf("T%hhu NOT ATTACHED\r\n", sensor + 1);
// probe is not present, all read to 0xFF
// set the CRC value to false, and reset temp with error scale 99°c
scratchpad[sensor][0] = 198;
}
}
static void SkipRom(uint8_t sensor)
{
OW_Reset(sensor);
OW_WriteByte(sensor, 0xCC);
}
//converts sensor temp to readable temp
static void Convert(uint8_t sensor)
{
SkipRom(sensor);
OW_WriteByte(sensor, 0x44); // init temp conversion cmd
}
static void ReadTemp(uint8_t sensor)
{
SkipRom(sensor);
OW_WriteByte(sensor, 0xBE);
Read(sensor, 9);
}
void TEMP_Init(void)
{
T1_OUT = LOW;
T1_DIR = INPUT;
T2_OUT = LOW;
T2_DIR = INPUT;
T3_OUT = LOW;
T3_DIR = INPUT;
T4_OUT = LOW;
T4_DIR = INPUT;
T5_OUT = LOW;
T5_DIR = INPUT;
}
void TEMP_Main(void)
{
if(reading)
{
for(uint8_t sensor = 0; sensor < TEMP_SENSOR_AMOUNT; sensor++)
{
ReadTemp(sensor);
value[sensor] = (((int16_t)(scratchpad[sensor][1] << 8) + scratchpad[sensor][0]) * 10) >> 4;
printf("T%u:%hu\t%hu\r\n", sensor + 1, scratchpad[sensor][1], scratchpad[sensor][0]);
printf("T%u:%hu\r\n", sensor + 1, value[sensor]);
}
}
else
{
for(uint8_t sensor = 0; sensor < TEMP_SENSOR_AMOUNT; sensor++)
Convert(sensor);
}
reading = !reading;
}
int16_t TEMP_GetValue(uint8_t sensor)
{
return value[sensor];
}uart1.c 1.c：(uart1.c 1.h只包含原型)
/*
* File: uart1.c
* Author: Wesley
*
* Created on September 6, 2022, 3:43 PM
*/
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <xc.h>
#include "uart1.h"
#include "delay.h"
#include "pin.h"
UART1_direction_t dir;
uint8_t *UART1_simBuf;
uint8_t UART1_simPtr = 0;
//debug
char c;
static void SetDirection(UART1_direction_t direction)
{
dir = direction;
MUX_A = (dir & 1);
MUX_B = (dir & 2) != 0;
Delay10us(2);
}
static void WriteChar(char data, uint8_t len)
{
while(!UART1_TX_IF);
TXREG1 = data;
}
static void WriteString(char *data, uint8_t len)
{
for(uint8_t i = 0; i < len; i++)
{
while(!UART1_TX_IF);
TXREG1 = data[i];
}
}
void UART1_Init(void)
{
MUX_RC_DIR = OUTPUT;
MUX_TX_DIR = INPUT;
MUX_A_DIR = OUTPUT;
MUX_B_DIR = OUTPUT;
//according to JAL
BAUDCON1 = 0b01001000;// RCIDL, BRG16
TXSTA1 = 0b00100100;// TXEN, BRGH
RCSTA1 = 0b10010000; //SPEN, CREN
//SPBRG1 = 42; //115200
SPBRG1 = 0x08;// BAUD 9600
SPBRGH1 = 0x02;
SEND_REC_DIR = OUTPUT;
UART1_RC_IE = true;
UART1_RC_IP = HIGH;
UART1_TX_IP = LOW;
SetDirection(UART1_SIM);
}
void putch(char data)
{
SetDirection(UART1_FTDI);
WriteChar(data, 1);
}
void UART1_WriteSim(char *data)
{
SetDirection(UART1_SIM);
WriteString(data, (uint8_t)(strchr(data, '\0') - data));
}
void UART1_RC_ISR(void)
{
if(RCSTA1bits.OERR)//if overflow, restart
{
RCSTA1bits.CREN = 0;
RCSTA1bits.CREN = 1;
return;
}
c = RCREG1;
switch(dir)
{
case UART1_SIM:
// if(UART1_simPtr < SIM_BUFFER_SIZE)
// UART1_simBuf[UART1_simPtr++] = c;
break;
case UART1_RS485:
break;
case UART1_FTDI:
break;
case UART1_DUST_D1:
break;
}
}
char UART1_GetLast(void)
{
return c;
}再次抱歉抛出所有代码，但我们有点绝望。如果有任何问题回覆，请问，我将尽力回答。
回答 1
Stack Overflow用户
发布于 2022-09-30 08:09:58
不确定这是否是造成此问题的原因，但这里确实有一个bug：
(int16_t)(scratchpad[sensor][1] << 8)。
由于您使用的是8位，所以uint8_t操作数scratchpad[sensor][1]将被隐式提升到int，即16位(参见Implicit type promotion rules)。在此之后，您可能会将数据转换为符号位，从而导致未定义的行为。后来右转，你也会因此而遇到类似的问题。
对int16_t的转换是没有意义的--由于隐式的提升，结果将已经是这种类型了。但是，您需要确保位移位总是发生在操作数上，操作数是uint16_t！不是uint8_t，不是int16_t。与流行的观点相反，在C中编写8位代码并不是那么简单。16位int类型意味着您需要很好地了解所有隐式类型升级规则。
为了提高可读性，我正在将杂乱无章的“一行”拆分成几个代码：
uint16_t tmp = (uint16_t)scratchpad[sensor][1] << 8;
tmp += scratchpad[sensor][0];
tmp *= 10;
value[sensor] = (int16_t) (tmp >> 4);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/73895561
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