Hola a todos!
Estoy empezando con PIC's y haciendo un proyecto importante, eh intentado realizar una comunicación I2C con el sensor de temperatura y presión BMP180. Todo iba bien, y hasta pude hacer el programa y simularlo completamente en PROTEUS, pero el problema aquí es que al llevarlo a la vida "real" este no funciona.
Después de horas y horas intentando, llegue a la conclusión que esta atascado en una función, mas precisamente en ReadI2C(), lo eh comprobado indicando con un led al salir de la rutina y es la única que me da problemas.
El programa es sencillo, quiero leer la posición 0xD0 que según la hoja de datos del sensor, tiene el valor cargado en 0x55.
En mi protoboard conecte como en la imagen de Proteus, solamente agregue un convertidor de niveles lógicos ya que el sensor trabaja con 3,3V, y conecte las resistencias de pull-up también.
El pic que estoy usando es el PIC18F4550 con la versión 1.31 de XC8.
// CONFIG1L
#pragma config PLLDIV = 1 // PLL Prescaler Selection bits (No prescale (4 MHz oscillator input drives PLL directly))
#pragma config CPUDIV = OSC1_PLL2// System Clock Postscaler Selection bits ([Primary Oscillator Src: /1][96 MHz PLL Src: /2])
#pragma config USBDIV = 1 // USB Clock Selection bit (used in Full-Speed USB mode only; UCFG:FSEN = 1) (USB clock source comes directly from the primary oscillator block with no postscale)
// CONFIG1H
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator (HS))
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled))
#pragma config BORV = 3 // Brown-out Reset Voltage bits (Minimum setting 2.05V)
#pragma config VREGEN = OFF // USB Voltage Regulator Enable bit (USB voltage regulator disabled)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)
// CONFIG3H
#pragma config CCP2MX = ON // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = ON // PORTB A/D Enable bit (PORTB<4:0> pins are configured as analog input channels on Reset)
#pragma config LPT1OSC = OFF // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = ON // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = OFF // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)
#pragma config ICPRT = OFF // Dedicated In-Circuit Debug/Programming Port (ICPORT) Enable bit (ICPORT disabled)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000800-001FFFh) is not code-protected)
#pragma config CP1 = OFF // Code Protection bit (Block 1 (002000-003FFFh) is not code-protected)
#pragma config CP2 = OFF // Code Protection bit (Block 2 (004000-005FFFh) is not code-protected)
#pragma config CP3 = OFF // Code Protection bit (Block 3 (006000-007FFFh) is not code-protected)
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protection bit (Boot block (000000-0007FFh) is not code-protected)
#pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM is not code-protected)
// CONFIG6L
#pragma config WRT0 = OFF // Write Protection bit (Block 0 (000800-001FFFh) is not write-protected)
#pragma config WRT1 = OFF // Write Protection bit (Block 1 (002000-003FFFh) is not write-protected)
#pragma config WRT2 = OFF // Write Protection bit (Block 2 (004000-005FFFh) is not write-protected)
#pragma config WRT3 = OFF // Write Protection bit (Block 3 (006000-007FFFh) is not write-protected)
// CONFIG6H
#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) are not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot block (000000-0007FFh) is not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM is not write-protected)
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protection bit (Block 0 (000800-001FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Table Read Protection bit (Block 1 (002000-003FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Table Read Protection bit (Block 2 (004000-005FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Table Read Protection bit (Block 3 (006000-007FFFh) is not protected from table reads executed in other blocks)
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) is not protected from table reads executed in other blocks)
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
#include <xc.h>
#include <plib/i2c.h>
#include <pic18f4550.h>
#include <plib/delays.h>
#include <plib/usart.h>
#include "stdlib.h"
#include "math.h"
#define _XTAL_FREQ 20000000
void retardo();
void main(void){
TRISDbits.RD1=0;
//TRISBbits.RB0=1;
//TRISBbits.RB1=1;
int dato;
while(1){
CloseI2C();
OpenI2C(MASTER,SLEW_OFF); //Modo MAESTRO y Slew rate OFF
SSPADD=49; // clock = FOSC/(4 * (SSPADD + 1)), 100kHZ @ 20Mhz, velocidad de transmisión I2C
StartI2C();
IdleI2C();
WriteI2C(0xEE); //Dirección del esclavo y ESCRIBIR
IdleI2C();
WriteI2C(0xD0); //dirección de memoria a leer
IdleI2C();
RestartI2C();
IdleI2C();
WriteI2C(0xEF); //Dirección del esclavo y LEER
IdleI2C();
dato= ReadI2C();
LATDbits.LATD1=1;
NotAckI2C();
StopI2C();
retardo();
}
return;
}
void retardo(){
int x;
for(x=0;x<200;x++) {
__delay_ms(5);
}
}
Espero que puedan ayudarme que llevo algunos días intentando solucionarlo pero nada!
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