?? nvm.c
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//===============================================================
// File name : Nvm.C
// Non Volatile Memory interface
//===============================================================
//------------------------------------------------------------------
// Include file and variable
//------------------------------------------------------------------
#include <hms800.h> //
#include "MC80C7208.h" // SFR define
#define USER_EXTERN extern // extern variable define
#include "Variable.h" //
//------------------------------------------------------------------
// external prototype function
//------------------------------------------------------------------
#define NVM_PAGE1 0xA0 //
#define NVM_PAGE2 0xA2 //
#define NVM_Option 0xE2 //
#define NVM_Virgin_ID 0xFE //
#define Old_NVM 0x39 //
//===============================================================
/*
; task : I2C bus function
; input :
; rI2C_Mad Main(Slave)address
; rI2C_Sad Sub register address
; *mI2C_post Data Pointer of MCU
; rI2C_byte How many Data byte accessed ?
; rI2C_Mode Data Transfer format
; x--- ---- 1=read, 0=write
; -xx- ---- how many subaddress (max.3 bytes)
; ---x xxxx how many data byte accessed ?(max.31 bytes)
; output:
; f_NoACK (0=ok, 1=fail)
;
*/
//==================================================================
//------------------------------------------------------------------
// task : I2C delay
//------------------------------------------------------------------
void Delay_5us();
asm("
.sect .text
.globl _Delay_5us
.type _Delay_5us,@function
_Delay_5us: ; 8
ret ; 5 = 6.5us
");
//------------------------------------------------------------------
// task : I2C Restart
//------------------------------------------------------------------
void I2C_restart();
asm("
.sect .text
.globl _I2C_restart
.type _I2C_restart,@function
SDA equ 4,0C0h ; R04
SCL equ 6,0C0h ; R06
_I2C_restart:
; ldm 0C0h, #52h ; R0
ldm 0A5h, #70h ; R0PU
; ldm 0C1h, #52h ; R0IO = 0101_0010
ldm 0C0h, #72h ; R0
ldm 0C1h, #72h ; R0IO
call !_Delay_5us ;
clr1 SDA ; SDA = low
call !_Delay_5us ;
clr1 SCL ; SCL = low
ret
");
//------------------------------------------------------------------
// task : I2C stop generate
//------------------------------------------------------------------
void I2C_stop();
asm("
.sect .text
.globl _I2C_stop
.type _I2C_stop,@function
_I2C_stop:
ldm 0C1h, #52h ; SCL/SDA out
clr1 SCL ; SCL = low
clr1 SDA ; SDA = high
call !_Delay_5us ;
set1 SCL ; SCL = high
call !_Delay_5us ;
set1 SDA ; SDA = high
ret ;
");
//------------------------------------------------------------------
// task : I2C clock pulse out
//------------------------------------------------------------------
void SCL_out();
asm("
.sect .text
.globl _SCL_out
.type _SCL_out,@function
_SCL_out:
set1 SCL ; SCL = high
nop ;
nop ;
nop ;
nop ;
nop ;
clr1 SCL ; SCL = low
ret ;
");
//------------------------------------------------------------------
// task : i = 1 Byte狼 Data write
// input : i
// output: f_NoACK = 1 fail
//------------------------------------------------------------------
void Write_byte(void);
asm("
.sect .text
.globl _Write_byte
.type _Write_byte,@function
_Write_byte:
ldm 0C1h, #70h ; -o-o ---- = SCL output, SDA output
; ldm 0C1h, #52h ; -o-o ---- = SCL output, SDA output
lda _i ;
ldy #8 ;
Rpt_Write_byte:
rol A ;
stc SDA ; Data out
call !_SCL_out ;
dbne Y,Rpt_Write_byte ;
ldm 0C1h, #40h ; -o-i ---- = SCL output, SDA input
nop ;
nop ;
nop ;
set1 SCL ; SCL=high
nop ;
nop ;
nop ;
nop ;
nop ;
ldc SDA ; ACK read
stc _rComm_flag.0 ; f_NoACK
clr1 SCL ; SCL=low
ret ;
");
//------------------------------------------------------------------
// task : 1 Byte狼 Data甫 Slave肺 何磐 佬瀾
// input :
// output: i = read data
//------------------------------------------------------------------
void Read_byte(void);
asm("
.sect .text
.globl _Read_byte
.type _Read_byte,@function
_Read_byte:
ldm 0C1h, #42h ; -o-i ---- = SCL output, SDA input
ldy #8 ;
Rpt_Read_byte:
set1 SCL ; SCL=high
nop ;
nop ;
nop ;
nop ;
nop ;
nop ;
ldc SDA ; data bit read
clr1 SCL ; SCL=low
nop ;
rol A ;
dbne Y,Rpt_Read_byte ;
sta _i ;
ret ;
");
//==================================================================
// task : n Byte Data iterface with NVM
// input : mI2C_mode R/W(7), Subaddress(6), Data byte(4~0)
// mI2C_mad 0xA0 or 0xA2 (24C04)
// mI2C_sad 0x00~0xFF
// mI2C_post data post in MCU
// output: f_NoACK (1=NAK, 0=ACK)
//==================================================================
void I2C_func(void)
{
uchar m,k;
I2C_restart(); // start
rI2C_byte = rI2C_mode & 0x1F; // data byte 薦 ? 31 bytes max
i = rI2C_mad; //
Write_byte(); //
if (f_NoACK) // Slave address out, no Acknowledge
{ I2C_stop(); // write fail
return; // no Acknowledge
}
i = rI2C_sad; //
Write_byte(); //
if (f_NoACK) // Sub address out, no Acknowledge
{ I2C_stop(); // write fail
return; // no Acknowledge
}
if (rI2C_mode & 0x80) // read/write ?
{
I2C_restart(); // restart for read cammand
i = rI2C_mad | 0x01;
Write_byte(); // read command out
if (f_NoACK) // no Acknowledge
{ I2C_stop(); // write fail no Acknowledge
return; //
}
for(k=0;k<rI2C_byte;k++)
{ Read_byte(); // Read byte
*rI2C_post = i; //
(uchar *)rI2C_post++; //
R0IO = 0x52; // sda(R04) output
if (k == (rI2C_byte -1)) // Last byte ?
p_SDA = ON; // No Acknowledge out
else p_SDA = OFF; // Acknowledge out
SCL_out();
}
}
else
{
for(k=0;k<rI2C_byte;k++) //
{ i = *rI2C_post; //
Write_byte(); // Write Byte
(uchar *)rI2C_post++; //
if (f_NoACK) //
{ I2C_stop(); // write fail
return; // no Acknowledge
}
}
}
I2C_stop();
}
//==================================================================
// task : NVM Data Read/Write
//==================================================================
//------------------------------------------------------------------
// task : Read / Write Option data
//------------------------------------------------------------------
void RW_Option(void)
{
rI2C_mad = NVM_PAGE1; // page1 = 0xA0
rI2C_sad = NVM_Option; //
(uchar *)rI2C_post= &rOption; //
I2C_func(); //
}
void Rd_Option(void)
{
rI2C_mode = 0xC1; // 1100_0001b
RW_Option();
}
void Wr_Option(void)
{
R01 = OFF; // write protect off
rI2C_mode = 0x41; // 0100_0001b
RW_Option();
R01 = ON; // write protect on
}
//==================================================================
// task : NVM Initialize
//==================================================================
void NVM_Initialize(void)
{
R01 = OFF; // write protect disable
rOption = 0x00; //
Wr_Option(); //
R01 = ON; // write protect enable
}
//==================================================================
// task : Check NVM Virgin
// 1. ACK啊 瀝惑利撈絆 2雀 撈惑 Virgin ID啊 促甫 錠 檬扁拳.
// 2. 2雀 撈惑 NoAck撈擱 FeRAM闌 焊齲竅扁 困秦 眠啊 I2C 烹腳闌
// 竅瘤 臼綽促.
// 3. 貿瀾 Virgin_ID啊 促福絆 滴鍋擄 NoAck撈擱 促矯 Check茄促.
//==================================================================
void Rd_NVM_Virgin(void)
{
rI2C_mad = NVM_PAGE1; // page 2 = 0xA2
rI2C_sad = NVM_Virgin_ID; // 0xFE
rI2C_mode = 0xC1; // 1100_0001b = 1 byte read
(uchar *)rI2C_post= &rTemp[0]; // read virgin ID
I2C_func(); //
}
void Check_NVM_Initial(void)
{
Rd_NVM_Virgin();
if(rTemp[0] != Old_NVM)
{ Rd_NVM_Virgin();
if(rTemp[0] != Old_NVM)
NVM_Initialize();
}
}
//================================================================
// the end of Nvm.C ?? 快捷鍵說明
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