?? flash_ctr.asm
字號(hào):
.DEFINE C_SIOCLOCK 0x0010; // CPUCLOCK/8
.define B_Busy 0x80
.const C_Program_Time =60 //60us
.const C_SectorErase_Time =400 //60us*400=24ms
.const C_MassErase_Time =1166 //60us*1166=70ms
.include hardware.inc
.CODE
.PUBLIC _SP_SIOInitial;
_SP_SIOInitial: .PROC
//系統(tǒng)時(shí)鐘設(shè)定
r1 = 0x0098; //Fosc=49mHz
[P_SystemClock] = r1;
r1 = [P_IOB_Dir];
r1 |= 1; //set bit0 output for sck
[P_IOB_Dir] = r1;
r1 = [P_IOB_Attrib];
r1 |= 1; //buffer output
[P_IOB_Attrib] = r1;
r1 = [P_IOB_Buffer];
r1 |= 1; //output high
[P_IOB_Data] = r1;
retf
.ENDP
//////////////////////////////////////////////////////////////////
// Function: Send A Byte to Serial Flash
// Syntax: SP_SIOSendAByte(AddressLow,AddressHigh, data)
// c level public
// Used register: r1,r2,r3
//////////////////////////////////////////////////////////////////
.public _SP_SIOSendAByte;
_SP_SIOSendAByte: .PROC
F_SIOSendAByte:
PUSH BP,BP TO [SP];
BP = SP + 1;
R1 = [BP+3];
[P_SIO_Addr_Low]=r1; // input SFLASH low address
r1=r1 lsr 4; // right shift 8
r1=r1 lsr 4;
[P_SIO_Addr_Mid]=r1; // input SFLASH mid address
R1 = [BP+4]; // Port direction
r1=r1&0x0007; // input SFLASH hi address
[P_SIO_Addr_High]=r1;
r1=0x00C3+C_SIOCLOCK;
[P_SIO_Ctrl]=r1; // clk=CPUclk/8, 24 bit address ;write
[P_SIO_Start]=r1; // enable write mode
R1 = [BP+5];
[P_SIO_Data]=r1; // state to transmit data
L_WaitSIOSendReady:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReady
[P_SIO_Stop]=r1; //disable write mode
call F_Delay_Program_Time
POP BP,BP FROM [SP];
retf;
.ENDP;
//////////////////////////////////////////////////////////////////
// Function: Read A Byte to Serial Flash
// Syntax: SP_SIOReadAByte(AddressLow, AddressHigh)
// c level public
// Used register: r1,r2,r3
// Return register: r1
//////////////////////////////////////////////////////////////////
.public _SP_SIOReadAByte;
_SP_SIOReadAByte: .PROC
F_SIOReadAByte:
PUSH BP,BP TO [SP];
BP = SP + 1;
R1 = [BP+3];
[P_SIO_Addr_Low]=r1; // input SFLASH low address
r1=r1 lsr 4;
r1=r1 lsr 4;
[P_SIO_Addr_Mid]=r1; // input SFLASH mid address
R1 = [BP+4]; // Port direction
r1=r1&0x0007; // input SFLASH hi address
[P_SIO_Addr_High]=r1;
r1=0x0083+C_SIOCLOCK;
[P_SIO_Ctrl]=r1; // clk=CPUclk/16, 24 bit address ;read
[P_SIO_Start]=r1; // enable read mode
r2=[P_SIO_Data]; // Clear SFLASH buffer
L_WaitSIOReadReady1:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOReadReady1
r1=[P_SIO_Data]; // Read exact Data
L_WaitSIOReadReady2: // Wait read stop
r2=[P_SIO_Start];
test r2,0x0080
jnz L_WaitSIOReadReady2
[P_SIO_Stop]=r2; // disable read mode
POP BP,BP FROM [SP];
retf;
.ENDP;
//////////////////////////////////////////////////////////////////
// Function: Send A Word to Serial Flash
// Syntax: SP_SIOSendAData(AddressLow,AddressHigh, data) Address must be even
// c level public
// Used register: r1,r2,r3
//////////////////////////////////////////////////////////////////
.public _SP_SIOSendAWord;
_SP_SIOSendAWord: .PROC
F_SIOSendAWord:
PUSH BP,BP TO [SP];
BP = SP + 1;
r1=0x00C3+C_SIOCLOCK;
[P_SIO_Ctrl]=r1; // clk=CPUclk/8, 24 bit address ;write
R1 = [BP+3];
[P_SIO_Addr_Low]=r1; // input Sflash low address
r1=r1 lsr 4; // right shift 8
r1=r1 lsr 4;
[P_SIO_Addr_Mid]=r1; // input SFLASH mid address
R1 = [BP+4]; // Port direction
r1=r1&0x0007; // input SFLASH hi address
[P_SIO_Addr_High]=r1;
[P_SIO_Start]=r1; // enable write mode
R1 = [BP+5];
[P_SIO_Data]=r1; //start to transmit low byte
L_WaitSIOSendReadyLB:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReadyLB
[P_SIO_Stop]=r1; // disable write mode
call F_Delay_Program_Time
R1 = [BP+3];
r1+=1;
[P_SIO_Addr_Low]=r1; // input SFLASH low address
[P_SIO_Start]=r1; //enable write mode
r1=[BP+5];
r1=r1 lsr 4; // right shift 8
r1=r1 lsr 4;
[P_SIO_Data]=r1; //start to transmit high byte
L_WaitSIOSendReadyHB:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReadyHB
[P_SIO_Stop]=r1; //disable write mode
call F_Delay_Program_Time
POP BP,BP FROM [SP];
retf;
.ENDP;
//////////////////////////////////////////////////////////////////
// Function: Read A Word from Serial Flash
// Syntax: SP_SIOReadAWord(AddressLow, AddressHigh)
// c level public
// Used register: r1,r2,r3,r4
// Return register: r1
//////////////////////////////////////////////////////////////////
.public _SP_SIOReadAWord;
_SP_SIOReadAWord: .PROC
F_SIOReadAWord:
PUSH BP,BP TO [SP];
BP = SP + 1;
r4=0x00FF;
R1 = [BP+3];
[P_SIO_Addr_Low]=r1; // input SFLASH low address
r1=r1 lsr 4;
r1=r1 lsr 4;
[P_SIO_Addr_Mid]=r1; // input SFLASH mid address
R1 = [BP+4]; // Port direction
r1=r1&0x0007; // input SFLASH hi address
[P_SIO_Addr_High]=r1;
r1=0x0083; // C_SIOCLOCK 0x0010
[P_SIO_Ctrl]=r1; // clk=CPUclk/16, 24 bit address ;read
[P_SIO_Start]=r1; // enable read mode
r2=[P_SIO_Data]; // Clear SFLASH buffer
L_WaitSIOReadReady1LB:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOReadReady1LB
r2=r4&[P_SIO_Data]; // Read exact Low Byte
L_WaitSIOReadReady2LB: // Wait read stop
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOReadReady2LB
r3=r4&[P_SIO_Data]; // Read exact High Byte
L_WaitSIOReadReady2HB: // Wait read stop
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOReadReady2HB
[P_SIO_Stop]=r1; // disable read mode
r3=r3 lsl 4; //shift left 8
r1=r3 lsl 4;
r1|=r2; //return data
POP BP,BP FROM [SP];
retf;
.ENDP;
///////////////////////////////////////////////////////////////
//Function : Mass Erase for S_Flash
// Syntax: SIOMassErase()
// Used register: r1,r2
///////////////////////////////////////////////////////////////
.public _SP_SIOMassErase;
_SP_SIOMassErase: .PROC
F_SIOMassErase:
push r1,r2 to [sp];
r1=0x00C0+C_SIOCLOCK;
[P_SIO_Ctrl]=r1; // clk=CPUclk/8, 16 bit address ;write
r2=0x0000;
[P_SIO_Addr_Low]=r2; // input SFLASH low address
r2=0x00C0;
[P_SIO_Addr_Mid]=r2; // input SFLASH mid address
r2=0x00C0;
[P_SIO_Addr_High]=r2;
[P_SIO_Start]=r1; // enable write mode
r1=0; // A7~A0 = 0
[P_SIO_Data]=r1; // state to transmit data
L_WaitSIOSendReadyMass:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReadyMass
[P_SIO_Stop]=r1;
call F_Delay_MassErase_Time
pop r1,r2 from [sp];
retf;
.ENDP;
///////////////////////////////////////////////////////////////
//Function : Sector Erase for S_Flash (Page Size 1K)
// Syntax: SP_SIOSectorErase(Sector)
// Used register: r1,r2
///////////////////////////////////////////////////////////////
.public _SP_SIOSectorErase;
_SP_SIOSectorErase: .PROC
SP_SIOSectorErase:
PUSH BP,BP TO [SP];
BP = SP + 1;
R1 = [BP+3];
r1=r1&0x00ff;
r1=r1 lsl 3;
r1=r1|0x8000;
[P_SIO_Addr_Low]=r1; // input SFLASH low address ;for A15 and A10
r1=r1 lsr 4;
r1=r1 lsr 4;
[P_SIO_Addr_Mid]=r1; // input SFLASH mid address ;for A16
r1=0x00C0+C_SIOCLOCK;
[P_SIO_Ctrl]=r1; // clk=CPUclk/8, 16 bit address ;write
[P_SIO_Start]=r1; // enable write mode
r1=0; // A7~A0 = 0
[P_SIO_Data]=r1; // state to transmit data
L_WaitSIOSendReadyPage1:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReadyPage1
[P_SIO_Stop]=r1;
call F_Delay_SectorErase_Time
POP BP,BP FROM [SP];
retf;
.ENDP;
//=======================================================================================
//FunctionName:F_Delay_MassErase_Time
//Description:
//Author:
//Date:
//Destroy:
//Input:
//Return:
//========================================================================================
.public F_Delay_MassErase_Time;
F_Delay_MassErase_Time:
r2=C_MassErase_Time;
?L_Wait_MassErase_Time_Over:
call F_Delay_Program_Time;
r2-=1;
jnz ?L_Wait_MassErase_Time_Over;
retf;
//=======================================================================================
//FunctionName:F_Delay_SectorErase_Time
//Description:
//Author:
//Date:
//Destroy:
//Input:
//Return:
//========================================================================================
.public F_Delay_SectorErase_Time;
F_Delay_SectorErase_Time:
r2=C_SectorErase_Time; //6
?L_Wait_SectorErase_Time_Over:
call F_Delay_Program_Time;
r2-=1; //3
jnz ?L_Wait_SectorErase_Time_Over; //5
retf;
//=======================================================================================
//FunctionName:F_Delay_Program_Time
//Description:
//Author:
//Date:
//Destroy:
//Input:
//Return:
//========================================================================================
.public F_Delay_Program_Time;
F_Delay_Program_Time:
r1=C_Program_Time; //6
?L_Wait_Program_Time_Over: //52cycle,1us @ 49Mhz
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
nop; //4
r1-=1; //3
jnz ?L_Wait_Program_Time_Over; //5
retf; //12
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