I2C slave的代码
/**
Company:
Microchip Technology Inc.
File Name:
i2c_slave.c
Summary:
This is the main file generated using PIC10 / PIC12 / PIC16 / PIC18 MCUs
Description:
This header file provides implementations for driver APIs for all modules selected in the GUI.
Generation Information :
Product Revision : PIC10 / PIC12 / PIC16 / PIC18 MCUs - 1.78.1
Device : PIC16F15245
MPLABX : 5.40
XC8 : 2.20
*/
/*
(c) 2018 Microchip Technology Inc. and its subsidiaries.
Subject to your compliance with these terms, you may use Microchip software and any
derivatives exclusively with Microchip products. It is your responsibility to comply with third party
license terms applicable to your use of third party software (including open source software) that
may accompany Microchip software.
THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY
IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS
FOR A PARTICULAR PURPOSE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP
HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO
THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL
CLAIMS IN ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT
OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS
SOFTWARE.
*/
#include "mcc.h"
uint8_t slaveAddress = 0x30; // 7-bit slave address
uint8_t index = 0; // Array pointer
uint8_t temp = 0; // Temp register
uint8_t regAdd = 1; // First data byte was actually register address byte
void I2C_Initialize(void)
{
SSP1STATbits.SMP = 1; // Disable slew control for Standard mode
SSP1CON1bits.SSPM = 0b0110; // 7-bit slave mode
SSP1CON2bits.SEN = 1; // Enable clock stretching
SSP1CON3bits.SBCDE = 1; // Enable bus collision interrupts
SSP1ADD = slaveAddress; // Load slave address
SSP1CON1bits.SSPEN = 1; // Enable the module
PIR1bits.BCL1IF = 0; // Clear Bus Collision interrupt flag
PIR1bits.SSP1IF = 0; // Clear the SSP interrupt flag
PIE1bits.BCL1IE = 1; // Enable BCLIF
PIE1bits.SSP1IE = 1; // Enable SSPIF
INTCONbits.PEIE = 1; // Enable peripheral interrupts
INTCONbits.GIE = 1; // Enable global interrupts
}
void __interrupt() ISR(void)
{
if(PIR1bits.SSP1IF) // Check for SSPIF
{
if(SSP1STATbits.R_nW == 1) // Master wants to read (slave transmit)
{
SSP1BUF = i2cArray[index++]; // Load array value
SSP1CON1bits.CKP = 1; // Release clock stretch
}
if(SSP1STATbits.R_nW == 0) // Master wants to write (slave receive)
{
if(SSP1STATbits.D_nA == 0) // Last byte was an address
{
regAdd = 1; // Next byte will be register address
temp = SSP1BUF; // Clear BF
SSP1CON1bits.CKP = 1; // Release clock stretch
}
if(SSP1STATbits.D_nA == 1) // Last byte was data
{
if(regAdd == 1) // If last byte was the register address
{
index = SSP1BUF; // Load register address into index
regAdd = 0; // Next byte will be true data
}
else
{
if(index < ARRAY_CNT) // Within array boundaries?
{
i2cArray[index++] = SSP1BUF; // Yes, load data from SSP1BUF
}
else
{
temp = SSP1BUF; // No, array location invalid, discard data
}
}
SSP1CON1bits.CKP = 1; // Release clock stretch
}
}
}
if(PIR1bits.BCL1IF == 1)
{
temp = SSP1BUF; // Clear BF
PIR1bits.BCL1IF = 0; // Clear BCLIF
SSP1CON1bits.CKP = 1; // Release clock stretching
}
PIR1bits.SSP1IF = 0; // Clear SSP1IF
}
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