wait_irq.s

ATEML公司EB40/40a/42/63/55开发板部分测试程序。

#;------------------------------------------------------------------------------
#;-         ATMEL Microcontroller Software Support  -  ROUSSET  -
#;------------------------------------------------------------------------------
#; The software is delivered "AS IS" without warranty or condition of any
#; kind, either express, implied or statutory. This includes without
#; limitation any warranty or condition with respect to merchantability or
#; fitness for any particular purpose, or against the infringements of
#; intellectual property rights of others.
#;------------------------------------------------------------------------------
#;- File source          : wait_irq.mac
#;- Object               : Assembler Wait Interrupt Handler Macro
#;-
#;- 1.0 00/00/00 JCZ     : Creation
#;- 2.0 02/11/00  EL     : Include files path modification
#;------------------------------------------------------------------------------

#            AREA        reset, CODE, READONLY, INTERWORK

            .INCLUDE     "../../periph/aic/aic.inc"
            .INCLUDE     "../../drivers/wait/wait_irq.mac"
           
#;------------------------------------------------------------------------------
#;- Function         : wait_irq
#;- Treatments       : Wait Interrupt Handler
#;- Operations       :
#;------------------------------------------------------------------------------

#            wait_irq_asm_handler    wait_desc, wake_up_handler

            .global  wake_up_handler
            .extern  wait_desc
            
wake_up_handler:
#- Adjust and save LR_irq in IRQ stack
            stmfd       sp!, {r0}

#- Write in the IVR to support Protect Mode
#- No effect in Normal Mode
#- De-assert the NIRQ and clear the source in Protect Mode
            ldr         r0, =AIC_BASE
            str         r0, [r0, #AIC_IVR]
#- Mark the End of Interrupt on the AIC
            str         r0, [r0, #AIC_EOICR]

#- Read the Status Register of the used Timer Counter
            ldr         r0, =wait_desc
            ldr         r0, [r0]        /* get the Timer Counter Descriptor Address   */
            ldr         r0, [r0]        /* get the Timer Counter Channel Base Address */
            ldr         r0, [r0, #TC_SR]
            
#- Adjust and save LR_irq in IRQ stack
            ldmia       sp!, {r0}

#- Adjust LR_irq and return 
            subs        pc, r14, #4

#            END