S3C2440定時器源程序如下:
- ;************口地址及數(shù)據(jù)符號化定義區(qū)**********************
- pWTCON EQU 0x53000000
- pLOCKTIME EQU 0x4c000000
- pCLKDIVN EQU 0x4c000014
- pUPLLCON EQU 0x4c000008
- pMPLLCON EQU 0x4c000004
- pBWSCON EQU 0x48000000
- pSRCPND EQU 0x4a000000 ;中斷源懸掛寄存器地址
- pINTPND EQU 0x4a000010 ;中斷懸掛寄存器地址
- pINTMOD EQU 0x4a000004 ;中斷模式寄存器地址
- pINTMSK EQU 0x4a000008
- pINTSUBMSK EQU 0x4a00001c ;子中斷源屏蔽寄存器地址
- pINTOFFSET EQU 0x4a000014 ;中斷源偏移地址寄存器地址
- pTCFG0 EQU 0x51000000 ;定時器配置寄存器0
- pTCFG1 EQU 0x51000004 ;定時器配置寄存器1
- pTCNTB4 EQU 0x5100003c ;定時器4計數(shù)緩沖寄存器
- pTCON EQU 0x51000008 ;定時器控制寄存器
- DATA_EREA EQU 0x33FFFF00
- vCLKDIVN EQU 0x4
- vUPLLCON EQU 0x00038022
- vMPLLCON EQU 0x0005c011
- ;*************以下為各寄存器BANK數(shù)據(jù)寬度設置數(shù)據(jù)***********
- DW16 EQU (0x1)
- DW32 EQU (0x2)
- B1_BWSCON EQU (DW16)
- B2_BWSCON EQU (DW16)
- B3_BWSCON EQU (DW16)
- B4_BWSCON EQU (DW32)
- B5_BWSCON EQU (DW16)
- B6_BWSCON EQU (DW32)
- B7_BWSCON EQU (DW32)
- ;*************Bank 0 存儲器參數(shù)區(qū)**************************
- B0_Tacs EQU 0x3
- B0_Tcos EQU 0x3
- B0_Tacc EQU 0x7
- B0_Tcoh EQU 0x3
- B0_Tah EQU 0x3
- B0_Tacp EQU 0x1
- B0_PMC EQU 0x0
- ;*************Bank 4 存儲器參數(shù)區(qū)**************************
- B4_Tacs EQU 0x1
- B4_Tcos EQU 0x1
- B4_Tacc EQU 0x6
- B4_Tcoh EQU 0x1
- B4_Tah EQU 0x1
- B4_Tacp EQU 0x0
- B4_PMC EQU 0x0
- ;*************Bank 6 SDRAM存儲器參數(shù)區(qū)*********************
- B6_MT EQU 0x3
- B6_Trcd EQU 0x1
- B6_SCAN EQU 0x1
- ;************* SDRAM 動態(tài)存儲器所需的刷新參數(shù)區(qū)************
- REFEN EQU 0x1
- TREFMD EQU 0x0
- Trp EQU 0x1
- Tsrc EQU 0x1
- Tchr EQU 0x2
- REFCNT EQU 1268
- ;*************以下數(shù)據(jù)為CPSR中各工作模式的設置位信息*******
- USERMODE EQU 0x10
- IRQMODE EQU 0x12
- SVCMODE EQU 0x13
- MODEMASK EQU 0x1f
- NOINT EQU 0xc0
- ;*************以下為管理模式、IRQ、及用戶模式堆棧指針數(shù)據(jù)***
- UserStack EQU 0x33ff4800
- SVCStack EQU 0x33ff5800
- IRQStack EQU 0x33ff7000
- ;************以下為代碼區(qū)***************
- AREA Init,CODE,READONLY
- ENTRY
- EXPORT _ENTRY
- _ENTRY
- ResetEntry
- b _reset
- b .
- b .
- b .
- b .
- b .
- b IsrIRQ
- b .
- ;*****************預存開機后需要提取并設置到特殊功能寄存器內(nèi)存儲器參數(shù)區(qū)的數(shù)據(jù)，含數(shù)據(jù)寬度、刷新模式和頻率等
- SMRDATA
- DCD (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
- DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))
- DCD 0
- DCD 0
- DCD 0
- DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))
- DCD 0
- DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))
- DCD 0
- DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Tsrc<<18)+(Tchr<<16)+REFCNT)
- DCD 0x32
- DCD 0x30
- DCD 0x30
- ;*****以下IsrIRQ為中斷源判別程序***********
- IsrIRQ
- sub sp,sp,#4
- stmfd sp!,{r8-r9}
- ldr r9,=pINTOFFSET
- ldr r9,[r9]
- ldr r8,=HandleEINT0
- add r8,r8,r9,lsl #2
- ldr r8,[r8]
- str r8,[sp,#8]
- ldmfd sp!,{r8-r9,pc}
- LTORG
- ;****************以下為復位異常處理程序，主要完成時鐘及存儲器的初始化***************
- _reset
- ldr r0,=pWTCON
- ldr r1,=0x0
- str r1,[r0]
- ldr r0,=pINTMSK
- ldr r1,=0xffffffff
- str r1,[r0]
- ldr r0,=pINTSUBMSK
- ldr r1,=0x7fff
- str r1,[r0]
- ldr r0,=pLOCKTIME
- ldr r1,=0x00ffffff
- str r1,[r0]
- ldr r0,=pCLKDIVN
- ldr r1,=vCLKDIVN
- str r1,[r0]
- ldr r0,=pUPLLCON
- ldr r1,=vUPLLCON
- str r1,[r0]
- nop
- nop
- nop
- nop
- nop
- nop
- nop
- ldr r0,=pMPLLCON
- ldr r1,=vMPLLCON
- str r1,[r0]
- ;****設置SDRAM存儲器參數(shù)，最多13個，占52字節(jié)。***
- adrl r0,SMRDATA
- ldr r1,=pBWSCON
- add r2,r0,#52
- 0
- ldr r3,[r0],#4
- str r3,[r1],#4
- cmp r2,r0
- bne %B0
- ;*********初始化可能用到的不同工作模式下的堆棧區(qū)，即設置他們的堆棧指針*****
- InitStacks
- mrs r0,cpsr
- bic r0,r0,#MODEMASK|NOINT
- orr r1,r0,#IRQMODE
- msr cpsr_cxsf,r1
- ldr sp,=IRQStack
- orr r1,r0,#USERMODE
- msr cpsr_cxsf,r1
- ldr sp,=UserStack
- ldr pc,=Main
- LTORG
- ;以下為主程序區(qū)
- Main
- ldr r0,=pINTMOD
- ldr r1,=0x0
- str r1,[r0]
- ldr r0,=HandleEINT0+0x38 ;定時器4在二級向量表中的地址
- adrl r1,HandleTime4 ;提取定時器4中斷處理程序地址
- str r1,[r0]
- ldr r0,=0x20005000
- ldr r1,=0x00
- str r1,[r0]
- ldr r0,=0x20007000
- ldr r1,=0x00
- str r1,[r0]
- ldr r0,=0x20006000
- ldr r1,=0xff
- str r1,[r0]
-
- ldr r0,=pTCFG0
- ldr r1,=0x0000f900
- str r1,[r0]
- ldr r0,=pTCFG1
- ldr r1,=0x00002000
- str r1,[r0]
- ldr r0,=pTCNTB4
- ldr r1,=0x0000ADC0
- str r1,[r0]
- ldr r0,=pTCON
- ldr r1,=0x00600000
- str r1,[r0]
- ldr r0,=pTCON
- ldr r1,=0x00500000
- str r1,[r0]
- ldr r0,=pINTMSK
- ldr r1,=0xFFFFBFFF
- str r1,[r0]
- wait_server
- b .
- mov r0,r5
- bic r0,r0,#MODEMASK|NOINT
- orr r1,r0,#USERMODE
- msr cpsr_cxsf,r1
- b wait_server
- LTORG
- HandleTime4
- stmfd sp!,{r0,r1,lr}
- ldr r1,=int_count
- ldr r1,[r1]
- ldr r0,=0x20005000
- str r1,[r0]
- cmp r1,#16
- beq step1
- add r1,r1,#1
- ldr r0,=int_count
- ;mov r1,#0
- str r1,[r0]
- b step2
- step1 ldr r0,=int_count
- mov r1,#1
- str r1,[r0]
- step2 ldr r0,=pINTSUBMSK
- ……………………
- …………限于本文篇幅 余下代碼請從51黑下載附件…………
所有資料51hei提供下載:
實驗十定時器qrs10_2.rar
(1.96 KB, 下載次數(shù): 11)
2017-7-11 15:59 上傳
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S3C2440 下載積分: 黑幣 -5
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