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用HI-TECH C寫的使用PIC12C508讀寫93LC46范例程式
/************************************************************
?* Processer : Microchip PIC12C508??????? *
?* Compiler : Hi-TECH PICC 8.00 PL2?????? *
?* Writer : Jason Kuo?????????? *
?* Description : It can read/write 93LC46 (64 x 16-bit organization) *
?*************************************************************/
?
static volatile unsigned char RTCC @ 0x01;
static volatile unsigned char TMR0 @ 0x01;
static volatile unsigned char PCL @ 0x02;
static volatile unsigned char STATUS @ 0x03;
static????????? unsigned char FSR @ 0x04;
static volatile unsigned char OSCCAL @ 0x05;
static volatile unsigned char GPIO @ 0x06;
static????????? unsigned char control OPTION @ 0x00;
static volatile unsigned char control TRIS @ 0x06;
/* STATUS bits */
static bit? GPWUF @ (unsigned)&STATUS*8+7;
static bit PA0 @ (unsigned)&STATUS*8+5;
static bit? TO @ (unsigned)&STATUS*8+4;
static bit? PD @ (unsigned)&STATUS*8+3;
static bit? ZERO @ (unsigned)&STATUS*8+2;
static bit DC @ (unsigned)&STATUS*8+1;
static bit CARRY @ (unsigned)&STATUS*8+0;
/* OPTION bits */
#define? GPWU (1<<7)
#define? GPPU (1<<6)
#define? T0CS (1<<5)
#define? T0SE (1<<4)
#define? PSA (1<<3)
#define? PS2 (1<<2)
#define? PS1 (1<<1)
#define? PS0 (1<<0)
/*????? OSCCAL bits???? */
static volatile bit???? CAL3??? @ (unsigned)&OSCCAL*8+7;
static volatile bit???? CAL2??? @ (unsigned)&OSCCAL*8+6;
static volatile bit???? CAL1??? @ (unsigned)&OSCCAL*8+5;
static volatile bit???? CAL0??? @ (unsigned)&OSCCAL*8+4;
static volatile bit GP5 @ (unsigned)&GPIO*8+5;
static volatile bit GP4 @ (unsigned)&GPIO*8+4;
static volatile bit GP3 @ (unsigned)&GPIO*8+3;
static volatile bit GP2 @ (unsigned)&GPIO*8+2;
static volatile bit GP1 @ (unsigned)&GPIO*8+1;
static volatile bit GP0 @ (unsigned)&GPIO*8+0;
#define CONFIG_ADDR 0xFFF
/* code protection */
#define MCLREN? 0xFFFF // memory clear enable
#define MCLRDIS? 0xFFEF // memory clear disable
/*watchdog*/
#define WDTEN? 0xFFFF // watchdog timer enable
#define WDTDIS? 0xFFFB // watchdog timer disable
/* code protection */
#define PROTECT? 0xFFF7 // protect the program code
#define UNPROTECT 0xFFFF // do not protect the program code
/*osc configurations*/
#define EXTRC??? 0xFFFF // external resistor/capacitor
#define INTRC? 0xFFFE // internal
#define XT? 0xFFFD // crystal/resonator
#define LP? 0xFFFC // low power crystal/resonator
/* 93LC46 I/O pin define */
#define CS? GP0? //Chip Select
#define CLK GP1? //Serial Data Clock
#define DI GP2? //Serial Data Input
#define DO GP4? //Serial Data Output
void Delay(unsigned int counter);
void Pulse(void);
void StartBit(void);
void EWEN(void);
void EWDS(void);
extern void Write93LC46(unsigned char Offset_Addr, unsigned int tx_data);?
extern unsigned int Read93LC46(unsigned char Offset_Addr);
void InitPIC(void);
#define CLRWDT() asm(" clrwdt")
#define SLEEP()? asm(" sleep")
#define ___mkstr1(x) #x
#define ___mkstr(x) ___mkstr1(x)
#define __CONFIG(x) asm("\tpsect config,class=CONFIG,delta=2");\
?? asm("\tglobal\tconfig_word"); \
?? asm("config_word"); \
?? asm("\tdw "___mkstr(x))
#define __IDLOC(w)?????? asm("\tpsect idloc,class=IDLOC,delta=2");\
??? asm("\tglobal\tidloc_word"); \
??? asm("idloc_word"); \
??? asm("\tirpc\t__arg," ___mkstr(w)); \
??? asm("\tdw 0&__arg&h"); \
??? asm("\tendm")
__CONFIG(MCLRDIS & WDTDIS & EXTRC & PROTECT);
/*----------------------------------------------------
?Function : Delay??????????
?Input : unsigned int (counter)???????
?Output : None??????????
?Description : Delay routine???????
?if counter=1? delay 35us , if counter=10 delay 134us,
?if counter=100 delay 1.12ms,
?These delay is base on internal 4MHz?????
------------------------------------------------------*/?????
void Delay(unsigned int counter)
{
?? while(counter>0) counter--;?
}????????????????????????????????????
/*----------------------------------------------------
?Function : Pulse??????????
?Input : None???????
?Output : None??????????
?Description : Send a pulse (10) to Serial Data Clock(CLK)???????
------------------------------------------------------*/?????
void Pulse(void)
{
??? CLK = 1;
??? Delay(25);
??? CLK = 0;
}
/*----------------------------------------------------
?Function : StartBit??????????
?Input : None???????
?Output : None??????????
?Description :??
?1. Set Chip Select(CS) = 1 (high)
?2. Set a Start Bit(1) to Serial Data Input(DI)
------------------------------------------------------*/?????
void StartBit(void)
{
??? CS = 1;
??? DI = 1;
??? Pulse();
}
/*----------------------------------------------------
?Function : EWEN??????????
?Input : None???????
?Output : None??????????
?Description :? ERASE/WRITE Enable
?------------------------------------------------------*/?????
void EWEN(void)
{
??? unsigned char i,temp;
??? StartBit();????????????????? /* 1 */
??? temp = 0x80;??????????????????????? /* 0011xxxx ,(opcode:00, Address:11xxxx) */
??? for(i=0; i<8; i++) {
??????? if(0x30 & temp)
??????????? DI = 1;
??????? else
??????????? DI = 0;
??????? Pulse();
??????? temp >>= 1;
??? }
??? CS = 0;
}
/*----------------------------------------------------
?Function : EWDS??????????
?Input : None???????
?Output : None??????????
?Description :? ERASE/WRITE Disable
?------------------------------------------------------*/?????
void EWDS(void)
{
??? unsigned char i;
??? StartBit();????????????????? /* 1 */
??? DI = 0;?????????????????????? /* 0000xxxx, (opcode:00, Address:00xxxx) */
??? for(i=0; i<8; i++)
??????? Pulse();
??? CS = 0;
}
/*----------------------------------------------------
?Function : Write93LC46??????????
?Input : unsigned char Offset Address, unsigned int tx_data???????
?Output : None??????????
?Description :? Write 16bits data in to 93LC46 Offset Address
?------------------------------------------------------*/?????
void Write93LC46(unsigned char Offset_Addr, unsigned int tx_data)
{
??? unsigned char Addr, i;
??? unsigned int temp;
??? EWEN();
??? StartBit();????????????????? /* 1 */
??? Offset_Addr=Offset_Addr&0x3F; /* 6bits address */
??? Addr = Offset_Addr + 0x40;????????? /* 01AAAAAA ,(opcode:01, address:AAAAAA) */
??? temp = 0x0080;
??? for(i=0; i<8; i++) {
??????? if(Addr & temp)
??????????? DI = 1;
??????? else
??????????? DI = 0;
??????? Pulse();
??????? temp >>= 1;
??? }
??? temp = 0x8000;????????????????????? /* DDDDDDDDDDDDDDDD(16bits data)*/
??? for(i=0; i<16; i++) {
??????? if(tx_data & temp)
??????????? DI = 1;
??????? else
??????????? DI = 0;
??????? Pulse();
??????? temp >>= 1;
??? }
??? CS = 0;
??? EWDS();
}
/*----------------------------------------------------
?Function : Read93LC46??????????
?Input : unsigned char Offset Address
?Output : unsigned int??????????
?Description :? Read 16bits data from 93LC46 offset address
?------------------------------------------------------*/?????
unsigned int Read93LC46(unsigned char Offset_Addr)
{
??? unsigned char Addr, i, temp;
??? unsigned int? rx_data;
??? StartBit();?????????????????? /* 1 */
??? Offset_Addr = Offset_Addr&0x3F; /* 6bits address */
??? Addr = Offset_Addr + 0x80;?????????? /* 10AAAAAA ,(opcode:10, address:AAAAAA) */
??? temp = 0x80;
??? for(i=0; i<8; i++) {
??????? if(Addr & temp)
??????????? DI = 1;
??????? else
??????????? DI = 0;
??????? Pulse();
??????? temp >>= 1;
??? }
??? rx_data = 0x0000;??????????????????? /* DDDDDDDDDDDDDDDD(16bits data)*/
??? for(i=0; i<16; i++) {
??????? Pulse();
??????? if(DO)
??????????? rx_data |= 0x0001;
??????? if(i < 15)
??????????? rx_data <<= 1;
??? }
??? CS = 0;
??? return(rx_data);
}
void InitPIC(void)
{
??? OPTION = (GPWU | GPPU | PS2 | PS1 | PS0);
??? TRIS = 0x10;???
??? CS = 0;
??? CLK = 0;
??? DI = 0;???
}
/* Main routine */
void main(void)
{
?unsigned char addr;
?unsigned int rx_buf;
?
?InitPIC();
?/* Read a word then +1 and write back to 93LC46 */
?for (addr = 0; addr < 10; addr++)
?{
? rx_buf = Read93LC46(addr);
? rx_buf = rx_buf+1;
? Write93LC46(addr, rx_buf);
?}
}
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