C8051F040的SMBus程序1

// 16-bit SFR declarations sfr16 RCAP4 = 0xCA; sfr16 TMR4 = 0xCC;
// Timer4 reload registers // Timer4 counter registers
sbit LED = P1^6;
// LED on P1.6
sbit SDA = P0^0; sbit SCL = P0^1;
unsigned char* pSMB_DATA_IN;
// Global pointer for SMBus data // All receive data is written here
unsigneห้องสมุดไป่ตู้ char SMB_SINGLEBYTE_OUT;
// Global holder for single byte writes.
#include <C8051F040.h>
// SFR declarations
//----------------------------------------------------------------------------// Global CONSTANTS //-----------------------------------------------------------------------------
// 2) Run the code:
//
a) the test will indicate proper communication with the EEPROM by
//
turning on the LED at the end the end of the test
//
b) the test can also be verified by running to the if statements
//
in main and checking the sent and received values by adding
//
the variables to the Watch Window
//
// FID:
04X000009
// Target:
C8051F04x
// Tool chain: Keil C51 7.50 / Keil EVAL C51
//-----------------------------------------------------------------------------
// F04x_SMBus_EEPROM.c
//-----------------------------------------------------------------------------
#define SMB_MRDBNACK 0x58
// ACK transmitted // (MR) data byte rec'vd; // NACK transmitted
//----------------------------------------------------------------------------// Global VARIABLES //-----------------------------------------------------------------------------
#define SMB_MRADDNACK 0x48
#define SMB_MRDBACK 0x50
// (all modes) BUS ERROR // (MT & MR) START transmitted // (MT & MR) repeated START // (MT) Slave address + W transmitted; // ACK received // (MT) Slave address + W transmitted; // NACK received // (MT) data byte transmitted; // ACK rec'vd // (MT) data byte transmitted; // NACK rec'vd // (MT) arbitration lost // (MR) Slave address + R transmitted; // ACK received // (MR) Slave address + R transmitted; // NACK received // (MR) data byte rec'vd;
unsigned char* pSMB_DATA_OUT;
// Global pointer for SMBus data. // All transmit data is read from here
unsigned char SMB_DATA_LEN;
// Global holder for number of bytes // to send or receive in the current // SMBus transfer.
// with a 256 byte I2C Serial EEPROM (Microchip 24LC02B).
// - Interrupt-driven SMBus implementation
// - Only master states defined (no slave or arbitration)
// SMBus on P0.0 // and P0.1
// Command Line: None
//
// Release 1.0
// -Initial Revision (TP)
// -20 APR 2006
//
//----------------------------------------------------------------------------// Includes //-----------------------------------------------------------------------------
bit SMB_BUSY = 0;
// Software flag to indicate when the // EEPROM_ByteRead() or // EEPROM_ByteWrite() // functions have claimed the SMBus
bit SMB_RW;
// Software flag to indicate the // direction of the current transfer
SMB_BUS_ERROR SMB_START SMB_RP_START SMB_MTADDACK
0x00 0x08 0x10 0x18
#define SMB_MTADDNACK 0x20
#define SMB_MTDBACK 0x28
#define SMB_MTDBNACK 0x30
#define SMB_MTARBLOST 0x38 #define SMB_MRADDACK 0x40
// switchover if the <SMB_RANDOMREAD> // bit is set.
bit SMB_ACKPOLL;
// When set, this flag causes the ISR // to send a repeated START until the // slave has acknowledged its address
unsigned char WORD_ADDR;
// Global holder for the EEPROM word // address that will be accessed in // the next transfer
unsigned char TARGET;
// Target SMBus slave address
// Copyright 2006 Silicon Laboratories, Inc.
//
//
// Program Description:
//
// This example demonstrates how the C8051F04x SMBus interface can communicate
// Device address for slave target
// Note: This address is specified
// in the Microchip 24LC02B
// datasheet.
#define MY_ADDR
0x02
// Address of this SMBus device // (dummy value since this device does // not have any defined slave states)
//
// P1.6 -> LED
//
// all other port pins unused
//
// How To Test:
//
// 1) Download code to a 'F04x device that is connected to a 24LC02B serial
// EEPROM (see the EEPROM datasheet for the pinout information).
bit SMB_SENDWORDADDR;
// When set, this flag causes the ISR // to send the 8-bit <WORD_ADDR> // after sending the slave address.