i2c_irq.paf.arm

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

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;.section ".AT91Lib","ax" 
;.AT91Lib
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#define AIC_PRIOR                            0x07    
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#define AIC_SRCTYPE                          0x60    
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#define AIC_SRCTYPE_INT_LEVEL_SENSITIVE      0x00    
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#define AIC_SRCTYPE_INT_EDGE_TRIGGERED       0x20    
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#define AIC_SRCTYPE_EXT_LOW_LEVEL            0x00    
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#define AIC_SRCTYPE_EXT_NEGATIVE_EDGE        0x20    
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#define AIC_SRCTYPE_EXT_HIGH_LEVEL           0x40    
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#define AIC_SRCTYPE_EXT_POSITIVE_EDGE        0x60    
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#define AIC_IRQID                    0x1F            
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#define AIC_NFIQ                     0x01            
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#define AIC_NIRQ                     0x02            
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#define AIC_BASE                     0xFFFFF000
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	/*END*/
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#define ARM_MODE_USER                0x10
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#define ARM_MODE_FIQ                 0x11
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#define ARM_MODE_IRQ                 0x12
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#define ARM_MODE_SVC                 0x13
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#define ARM_MODE_ABORT               0x17
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#define ARM_MODE_UNDEF               0x1B
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#define ARM_MODE_SYS                 0x1F
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#define I_BIT                        0x80
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#define F_BIT                        0x40
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#define T_BIT                        0x20
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            /*END*/
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   	    EXPORT	tc0_interrupt_handler
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	    IMPORT	I2C_line
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	    IMPORT	I2C_lineHandlerInt
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tc0_interrupt_handler
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            sub         r14, r14, 4
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            stmfd       sp!, {r14}
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            ldr         r14, =AIC_BASE
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            str         r14, [r14, 0x100]
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            mrs         r14, SPSR
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            stmfd       sp!, {r0, r14}
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            mrs         r0, CPSR
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            bic         r0, r0, I_BIT
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            orr         r0, r0, ARM_MODE_SYS
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            msr         CPSR_c, r0
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            stmfd       sp!, { r1-r3, r12, r14}
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			ldr 			r0,=I2C_line
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			ldr			r1, =I2C_lineHandlerInt
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			mov			r14, pc
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			bx			r1
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            ldmia       sp!, { r1-r3, r12, r14}
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            mrs         r0, CPSR
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            bic         r0, r0, ARM_MODE_SYS
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            orr         r0, r0, I_BIT | ARM_MODE_IRQ
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            msr         CPSR_c, r0
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            ldr         r0, =AIC_BASE
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            str         r0, [r0, 0x130]
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            ldmia       sp!, {r0, r14}
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            msr         SPSR_cxsf, r14
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            ldmia       sp!, {pc}^
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			/*END*/
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/*END*/
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