?? sp_serialflashv1.asm
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//////////////////////////////////////////////////////////////////
// File: sflash.asm
// Function: SERIAL Flash Interface with Serial Flash V1.1
// Writen by: Honda
// Modified by: Arthur Shieh
// Modify list:
// 2001/08/23 : first version
// 2002/05/26 : Modified to use with DVR by Arthur Shieh
// 2002/06/06 : API wrapping
// Note:
// 1. Modify the C_SIOCLOCK to speed up the serial IO bus
// 2. Modified the delay to shorten the waiting time for flash writing
//
// Modified by: guangyuan wei (email: guangyuan/sunnorth) (Ext:2912)
// Modify list:
// 2003/05/21 : Added SP_SIOSectorErase(Sector)
//////////////////////////////////////////////////////////////////
.include spce.inc;
.DEFINE C_SIOCLOCK 0x0010; // CPUCLOCK/8
.CODE
//////////////////////////////////////////////////////////////////
// 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
call F_DelayPT // Delay necessary for the writing
call F_DelayPT
call F_DelayPT
call F_DelayPT
call F_DelayPT
[P_SIO_Stop]=r1; // disable write mode
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
call F_DelayPT
call F_DelayPT
call F_DelayPT
call F_DelayPT
call F_DelayPT
[P_SIO_Stop]=r1; //disable write mode
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; // 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;
// 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_WaitSIOSendReadyMass:
r1=[P_SIO_Start];
test r1,0x0080
jnz L_WaitSIOSendReadyMass
//disable write mode
[P_SIO_Stop]=r1;
call F_Delay11ms
call F_Delay11ms //modify by abin
call F_Delay11ms
call F_Delay11ms
pop r1,r2 from [sp];
retf;
.ENDP;
F_Delay11ms:
push r1,r1 to [sp];
//r1=17*10;
r1=20*10; // delay
L_LoopDelay11:
call F_Delay100uS;
r1-=1;
jne L_LoopDelay11
pop r1,r1 from [sp];
retf;
///////////////////////////////////////////////////////////////
//Function : 100us Dealy for S_Flash programming time (base on CPUCLK= 24MHz)
// Syntax: Delay100uS()
// Used register: r1,r2
///////////////////////////////////////////////////////////////
.public _Delay100uS;
_Delay100uS: .PROC
F_Delay100uS: //13
push r1,r1 to [sp]; //7
r1=294; //6
L_DelayLoop:
r1-=1; //3 26+19+8*294 =2400
jne L_DelayLoop; //5
pop r1,r1 from [sp]; //7
retf; //12
.ENDP;
///////////////////////////////////////////////////////////////
//Function : Dealy for S_Flash programming time (base on CPUCLK= 24MHz)
// Syntax: DelayPT()
// Used register: r1
///////////////////////////////////////////////////////////////
.public _DelayPT;
_DelayPT: .PROC
F_DelayPT: //13
push r1,r1 to [sp]; //7
//r1=294; //6
//r1=147;
//r1=1600;
//r1=100;
r1=160
//r1=200;
L_DelayLoopPT:
r1-=1; //3 26+19+8*160 =1325 ----> 56us
jne L_DelayLoopPT; //5
pop r1,r1 from [sp]; //7
retf; //12
.ENDP;
///////////////////////////////////////////////////////////////
//Function : Page 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; //disable write mode
call F_Delay11ms
POP BP,BP FROM [SP];
retf;
.ENDP;
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