📄 24c04test.c
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/*------------------------------------------------------------------------------------
插上短路环J10、J21。断开短路环J8.
P0.6 -> SDA (SMBus)
P0.7 -> SCL (SMBus)
功能：把写到EEPROM的值读出来。在液晶上显示 SMBUS 0xCC.如24C02损坏，则显示24C02 ERROR。
------------------------------------------------------------------------------------*/
// Includes
//------------------------------------------------------------------------------------
#include <c8051f330.h> // SFR declarations
#include <intrins.h>
#include "common.h"
//------------------------------------------------------------------------------------
// Global CONSTANTS
//------------------------------------------------------------------------------------
#define SYSCLK 24500000 // System clock frequency
#define SMB_FREQUENCY 50000 // Target SCL clock rate
#define WRITE 0x00 // SMBus WRITE command
#define READ 0x01 // SMBus READ command
// Device addresses (7 bits, lsb is a don't care)
#define EEPROM_ADDR 0xA0 // Device address for slave target
// Note: This address is specified
// in the Microchip 24LC02B
// datasheet.
// SMBus Buffer Size
#define SMB_BUFF_SIZE 0x08 // Defines the maximum number of bytes
// that can be sent or received in a
// single transfer
// Status vector - top 4 bits only
#define SMB_MTSTA 0xE0 // (MT) start transmitted
#define SMB_MTDB 0xC0 // (MT) data byte transmitted
#define SMB_MRDB 0x80 // (MR) data byte received
// End status vector definition
void YJ_Init(void);
void Write_CHAR(unsigned char yjchar);
//sbit LED=P1^0;
//------------------------------------------------------------------------------------
// Global VARIABLES
//------------------------------------------------------------------------------------
unsigned char* pSMB_DATA_IN; // Global pointer for SMBus data
// All receive data is written here
unsigned char SMB_SINGLEBYTE_OUT; // Global holder for single byte writes
unsigned char* pSMB_DATA_OUT; // Global pointer for SMBus data.
//unsigned long q; // 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
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
unsigned char temp_char; // temporary variable
unsigned char retval;
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
bit SMB_SENDWORDADDR; // When set, this flag causes the ISR
// to send the 8-bit <WORD_ADDR>
// after sending the slave address
bit SMB_RANDOMREAD; // When set, this flag causes the ISR
// to send a START signal after
// sending the word address
bit SMB_ACKPOLL; // When set, this flag causes the ISR
// to send a repeated START until the
// slave has acknowledged its address
// 16-bit SFR declarations
sfr16 TMR2RL = 0xca; // Timer2 reload registers
sfr16 TMR2 = 0xcc; // Timer2 counter registers
sfr16 TMR3RL = 0x92; // Timer2 reload registers
sfr16 TMR3 = 0x94; // Timer3 counter registers
//------------------------------------------------------------------------------------
// Function PROTOTYPES
//------------------------------------------------------------------------------------
void SMBus_Init (void);
void Timer1_Init (void);
void Timer3_Init (void);
void Port1_Init (void);
void SMBus_ISR (void);
void Timer3_ISR (void);
void EEPROM_ByteWrite(unsigned char addr, unsigned char dat);
void EEPROM_WriteArray (unsigned char dest_addr, unsigned char* src_addr,
unsigned char len);
unsigned char EEPROM_ByteRead(unsigned char addr);
void EEPROM_ReadArray (unsigned char* dest_addr, unsigned char src_addr,
unsigned char len);
unsigned char xdata tabn[10]={0x53,0x4d,0x42,0x55,0x53,0x20,0x30,0x78
,0x43,0x43};
//------------------------------------------------------------------------------------
// MAIN Routine
//------------------------------------------------------------------------------------
//
// Main routine performs all configuration tasks, then loops forever sending and
// receiving SMBus data to the slave F300_SLAVE
void main (void)
{
int iNum = 0;
int ii;
PCA0MD &= ~0x40; // WDTE = 0 (disable watchdog timer)
OSCICN |= 0x03; // Set internal oscillator to highest
// setting (24500000)
Port1_Init (); // Initialize Crossbar and GPIO
Timer1_Init (); // Configure Timer1 for use as SMBus
// clock source
Timer3_Init (); // Configure Timer2 for use with SMBus
// low timeout detect
SMBus_Init (); // Configure and enable SMBus
EIE1 = 1; // SMBus interrupt enable
IE = 0x20; // Timer2 interrupt enable
EA = 1; // Global interrupt enable
EEPROM_ByteWrite(0x38, 0xcc);
temp_char = EEPROM_ByteRead(0x38);
if(temp_char==0xcc) //有按键按下,显示对应的按键
{
YJ_Init(); //LCD初始化
//准备送数据
for(ii=0;ii<10;ii++){
Write_CHAR(tabn[ii]);
} //控制LCD
mysleep_ms();
}
else{
YJ_Init();
Write_CHAR(0x32);
Write_CHAR(0x34);
Write_CHAR(0x43);
Write_CHAR(0x30);
Write_CHAR(0x34);
Write_CHAR(0x20);
Write_CHAR(0x45);
Write_CHAR(0x52);
Write_CHAR(0x52);
Write_CHAR(0x4f);
Write_CHAR(0x52);
mysleep_ms();
}
}
//------------------------------------------------------------------------------------
// Functions
//------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------
// EEPROM_Write ()
//------------------------------------------------------------------------------------
//
// This function writes the value in <dat> to location <addr> in the EEPROM then polls
// the EEPROM until the write is complete.
//
void EEPROM_ByteWrite( unsigned char addr, unsigned char dat )
{
while (SMB_BUSY);
SMB_BUSY = 1; // Claim SMBus (set to busy)
// Set SMBus ISR parameters
TARGET = EEPROM_ADDR; // Set target slave address
SMB_RW = WRITE; // Mark next transfer as a write
SMB_SENDWORDADDR = 1; // Send Word Address after Slave Address
SMB_RANDOMREAD = 0; // Do not send a START signal after
// the word address
SMB_ACKPOLL = 1; // Enable Acknowledge Polling (The ISR
// will automatically restart the
// transfer if the slave does not
// acknowledge its address.
// Specify the Outgoing Data
WORD_ADDR = addr; // Set the target address in the EEPROM's
// internal memory space
SMB_SINGLEBYTE_OUT = dat; // store dat (local variable) in a global
// variable so the ISR can read it after
// this function exits
pSMB_DATA_OUT = &SMB_SINGLEBYTE_OUT; // The outgoing data pointer points to
// the <dat> variable.
SMB_DATA_LEN = 1; // Specify to ISR that the next transfer
// will contain one data byte
// Initiate SMBus Transfer
STA = 1;
}
//------------------------------------------------------------------------------------
// EEPROM_ByteRead ()
//------------------------------------------------------------------------------------
//
// This function returns a single byte from location <addr> in the EEPROM then
// polls the <SMB_BUSY> flag until the read is complete.
//
unsigned char EEPROM_ByteRead( unsigned char addr)
{
// unsigned char retval; // Holds the return value
int iLim1 = 100;
int iLim2 = 25000;
int iNum1 = 0;
int iNum2 = 0;
while (SMB_BUSY && iNum1 <iLim1 )
{
while(SMB_BUSY && iNum2 < iLim2)
{
iNum2++;
}
iNum2 = 0;
iNum1++;
} // Wait for SMBus to be free.
if( iNum1 >= iLim1)
{
return 0xcb;
}
SMB_BUSY = 1; // Claim SMBus (set to busy)
// Set SMBus ISR parameters
TARGET = EEPROM_ADDR; // Set target slave address
SMB_RW = WRITE; // A random read starts as a write
// then changes to a read after
// the repeated start is sent. The
// ISR handles this switchover if
// the <SMB_RANDOMREAD> bit is set.
SMB_SENDWORDADDR = 1; // Send Word Address after Slave Address
SMB_RANDOMREAD = 1; // Send a START after the word address
SMB_ACKPOLL = 1; // Enable Acknowledge Polling
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