?? lm92.c
字號(hào):
//參考程序A : //LM92.C
//LM92.C 程序功能: 讀/寫LM92并將溫度值顯示在SAA1064驅(qū)動(dòng)的四位數(shù)碼管上`.
#include <c8051f020.h> // SFR declarations
#include <intrins.h>
#define WRITE 0x00 // 寫命令位
#define READ 0x01 // 讀命令位
#define CHIP_B 0x70
#define SMB_START 0x08 // （MT＆MR）主收發(fā)器發(fā)送起始位成功.再將從機(jī)寫地址送SMB0DAT
#define SMB_RP_START 0x10 // (MT & MR)主收發(fā)器重復(fù)發(fā)送起始位成功,再將從機(jī)讀地址送SMB0DAT
#define SMB_MTADDACK 0x18 // （MT）主收發(fā)器發(fā)送從地址＋W成功；收到 ACK(從機(jī)應(yīng)答)
#define SMB_MTDBACK 0x28 //（MT）主收發(fā)器發(fā)送數(shù)據(jù)字節(jié)成功；收到ACK(從機(jī)應(yīng)答)
#define SMB_MRADDACK 0x40 // （MR）主收發(fā)器發(fā)送從地址＋R成功；收到 ACK(從機(jī)應(yīng)答)
#define SMB_MRDBACK 0x50 // （MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送ACK
#define SMB_MRDBNACK 0x58 // （MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送NACK
char COMMAND; //保存從地址 + R/W 位,用在 中斷服務(wù)函數(shù)中
char COMMAND1;
char WORD; // 保存被傳輸?shù)臄?shù)據(jù)
unsigned char totalnumber,wrnumber,rdnumber;
unsigned char xdata SENDMODE;
bit SM_BUSY; // 開始收/發(fā)數(shù)據(jù)時(shí),SM_BUSY被置1,完成操作時(shí)被清另.
unsigned char wr_data[8]; //用于存放輸出數(shù)據(jù)的數(shù)組
unsigned char rd_data[8]; //用于存放輸入數(shù)據(jù)的數(shù)組
void SYSCLK_Init (void);
void SMBUS_ISR (void);
char SLA_READ(char chip_select, char out_op, char number);//從LM92讀出數(shù)據(jù)到主機(jī)的函數(shù)
void SLA_SEND(char chip_select, char *wr_data, char number); //從主機(jī)輸出數(shù)據(jù)到LM92的函數(shù)
void sleep_ms(unsigned int count) //延時(shí)
{
unsigned char ii,jj;
for(ii=0;ii<count;ii++)
{
for(jj=0;jj<250;jj++)
_nop_();
}
}
void Initlm92(void)
{
wr_data[0] = 0x01; //地址指針指向配置寄存器
wr_data[1] = 0x00;
SLA_SEND(0x90,wr_data,0x02); //配置寄存器內(nèi)容為00，LM92為連續(xù)采樣模式
wr_data[0] = 0x03; //地址指針指向T_CRIT寄存器
wr_data[1] = 0x20;
wr_data[2] = 0x00;
SLA_SEND(0x90,wr_data,0x03); //T_CRIT寄存器16位 NO:03, 設(shè)置臨界溫度為+64度（2000h）
wr_data[0] = 0x04; //地址指針指向溫度下限寄存器
wr_data[1] = 0x07;
wr_data[2] = 0x80;
SLA_SEND(0x90,wr_data,0x03); //Tlow寄存器16位 NO:04, 設(shè)置溫度下限為+15度(0780h)
wr_data[0] = 0x05; //地址指針指向溫度上限寄存器
wr_data[1] = 0x28;
wr_data[2] = 0x00;
SLA_SEND(0x90,wr_data,0x03); //Thigh寄存器16位 NO:05, 設(shè)置溫度上限為+80度(2800h)
}
void MAIN (void)
{
unsigned char j,temp; // 測(cè)試時(shí)要使用的變量
//LED數(shù)碼管顯示數(shù)字(0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F)的字型碼:
unsigned char Number[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,
0x5e,0x79,0x71};
unsigned int i;
WDTCN = 0xde; // 禁止看門狗定時(shí)
WDTCN = 0xad;
SYSCLK_Init(); // 初始化時(shí)鐘
XBR0 = 0x01; // 配置交叉開關(guān)
XBR2 = 0x40; // 使能交叉開關(guān)和弱上拉
SMB0CN = 0x44; // 允許SMBus工作 ,應(yīng)答信號(hào)為低電平 (AA = 1)
SMB0CR = 0xc9; // 設(shè)置SMBus工作速率 為100 kHz(系統(tǒng)時(shí)鐘為11.0592MHZ)
EIE1 |= 2; // SMBus 中斷使能
EA = 1; // 開全局中斷
SM_BUSY = 0; // 第一次傳送數(shù)據(jù),清除SM_BUSY標(biāo)志
SI = 0; //中斷狀態(tài)位清另
Initlm92(); //LM92初始化
while(1){
for(j=0;j<20;j++){ //延時(shí)
sleep_ms(200);
}
SLA_READ(0x90,0x00,0x02); // LM92讀出溫度值(兩個(gè)字節(jié),16位數(shù)據(jù))
sleep_ms(200); //溫度值在數(shù)組rd_data[0]和rd_data[1]中
wr_data[0] = 0x00; //數(shù)組wr_data[0]存放輸出到SAA1064的數(shù)據(jù)
wr_data[1] = 0x17;
temp = rd_data[0]&&0x80; //判符號(hào)位(數(shù)據(jù)最高的一位)."1"為負(fù)號(hào),"0"為正號(hào)
if(temp==0x80) wr_data[2]=0x40;
else wr_data[2] = 0x3f;
i = (rd_data[0]&0x7f)*0x100+rd_data[1];//溫度值(在數(shù)組rd_data[0]中)數(shù)據(jù)處理
i = i>>3;
if (temp>0x80) //溫度若為負(fù)值,先求補(bǔ)碼
{
i=-i;
i=0x8000+i*5/8; //最低一位數(shù)對(duì)應(yīng)的溫度值為0.0625度,加符號(hào)位
}
else //溫度若為正值,整理數(shù)據(jù)送SAA1064顯示.
i=i*5/8; //最低一位數(shù)對(duì)應(yīng)的溫度值為0.0625度
temp = (i%1000)/100;
wr_data[3] = Number[temp]; //十位
temp = (i%100)/10;
wr_data[4] = Number[temp]|0x80; //個(gè)位
temp = (i%10);
wr_data[5] = Number[temp]; //小數(shù)位
SLA_SEND(CHIP_B,wr_data,0x06); //從主機(jī)輸出到LM92的數(shù)據(jù)在wr_data為首地址的數(shù)組中
} //溫度值送SAA1064顯示:數(shù)據(jù)四位,控制碼(17H)一位,子地址一位
} //溫度值四位,共有六位數(shù)要輸出到SAA1064去
void SYSCLK_Init (void)// 時(shí)鐘初始化
{ int i;
OSCXCN = 0x67; // 選擇外部晶振(11.0592MHZ)
for (i=0; i < 256; i++) ; // 等待>1ms
while (!(OSCXCN & 0x80)) ; // 等待外部晶振建立
OSCICN = 0x88; // 使用外部晶振作時(shí)鐘源(11.0592MHz)并允許時(shí)鐘丟失檢測(cè)
}
// Functions
// SLA_SEND:寫入從器件的程序
// chip_select 為從器件地址
// out_op 是送SAA1064子數(shù)據(jù)
// number是要傳送的字節(jié)的數(shù)目
void SLA_SEND(char chip_select, char *wr_data, char number) //從主機(jī)輸出數(shù)據(jù)到LM92的函數(shù)
{
SENDMODE=0x01;
totalnumber=number;
wrnumber=number;
while(SM_BUSY); // Wait while SMBus is busy.
SM_BUSY = 1; // SMBus busy flag set.
SMB0CN = 0x44; // SMBus enabled, ACK low.
COMMAND = (chip_select | WRITE); // COMMAND = 7 address bits + WRITE.
STO = 0;
STA = 1; // Start transfer.
while(SM_BUSY);
}
// 讀從器件的程序
// chip_select = 從讀地址
// out_op = 讀出的數(shù)據(jù)字節(jié)
//number=讀出數(shù)據(jù)的長(zhǎng)度
char SLA_READ(char chip_select, char out_op,char number) //從LM92讀出數(shù)據(jù)到主機(jī)的函數(shù)
{
totalnumber=number;
rdnumber=number;
SENDMODE=0;
while(SM_BUSY); // 總線SMBus忙碌則等待
SM_BUSY = 1; // 設(shè)置忙碌位
SMB0CN = 0x44; // 允許SMBus工作, 應(yīng)答信號(hào)為低
COMMAND1 = (chip_select | READ); // COMMAND1 = 7位地址+ 1個(gè)讀位
COMMAND = (chip_select | WRITE); // COMMAND = 7位地址+ 1個(gè)寫位
wr_data[0]=out_op;
STO = 0;
STA = 1; // 數(shù)據(jù)傳輸開始
while(SM_BUSY); // 等待數(shù)據(jù)傳輸完成
return WORD; // 返回
}
// SMBus Interrupt Service Routine SMBus中斷程序
void SMBUS_ISR (void) interrupt 7
{
switch (SMB0STA){ // SMBus中斷狀態(tài) SMB0STA register)
//SMB_START ; (SMB0STA =08H)
//主發(fā)送器／接收器發(fā)送起始位成功.再將從機(jī)寫地址送SMB0DAT并清除START位.
case SMB_START: //0x08
SMB0DAT = COMMAND ;
STA = 0; // 人工清除STA
SI = 0; // 人工清除SI
break;
//SMB_RP_START ;(SMB0STA =10H)
//主發(fā)送器／接收器發(fā)送重復(fù)起始位成功.再將從機(jī)讀地址送SMB0DAT并清除START位.
case SMB_RP_START: //0x10
SMB0DAT = COMMAND1;
STA = 0; // 人工清除STA
SI = 0;
break;
//SMB_MTADDACK (SMB0STA =18H)
//主發(fā)送器（MT）發(fā)送從地址＋W成功；收到 ACK(從機(jī)應(yīng)答),再將要發(fā)的子地址送入SMB0DAT.
case SMB_MTADDACK: //0x18
SMB0DAT = wr_data[0];
SI = 0; // Clear interrupt flag
break;
//SMB_MTDBACK SMB0STA =28H)
//主發(fā)送器（MT）發(fā)送數(shù)據(jù)字節(jié)成功；收到ACK(從機(jī)應(yīng)答)
//檢查BYTE_SENT：如果為1，說明剛發(fā)出的是存儲(chǔ)器地址；為0，剛發(fā)出的是數(shù)據(jù)字節(jié)
case SMB_MTDBACK: //0x28
switch (SENDMODE){ // Check only lower 4 bits.
// OP_CODE is a READ. Send repeated START.
case 1:
wrnumber--;
if(wrnumber)
SMB0DAT = wr_data[totalnumber-wrnumber];
else{
STO=1;
SM_BUSY=0; }
break;
case 0:
STO = 0;
STA = 1;
break;
default: // 遇到無效的中斷狀態(tài)碼,結(jié)束傳輸
STO = 1;
SM_BUSY = 0;
break;
}
SI = 0;
break;
//SMB_MRADDACK ;(SMB0STA =40H)
//（MR）主收發(fā)器發(fā)送從地址＋R成功；收到 ACK(從機(jī)應(yīng)答).主機(jī)發(fā)送ACK.
// Master Receiver: Slave address + READ transmitted. ACK received.
// Set to transmit NACK after next transfer since it will be the
// last (only) byte.
case SMB_MRADDACK: //0x40
if(rdnumber==1){
AA = 0;
}
SI = 0;
break;
//SMB_MRDBACK (SMB0STA =50H)
//（MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送ACK .
case SMB_MRDBACK: //0x50
rd_data[totalnumber-rdnumber] = SMB0DAT;
rdnumber--;
AA = 0;
SM_BUSY = 0;
SI = 0;
break;
//SMB_MRDBNACK ;(SMB0STA =58H)
//（MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送NACK
//讀操作完成。讀數(shù)據(jù)寄存器并發(fā)送STOP
case SMB_MRDBNACK: //0x58
rd_data[totalnumber-1] = SMB0DAT;
STO = 1;
SM_BUSY = 0;
AA = 1; // Set AA for next transfer
SI = 0;
break;
default:
STO = 1;
SM_BUSY = 0;
break;
};
}
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