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https://opencores.org/ocsvn/light52/light52/trunk
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/light52/trunk/test/irq_test/src/irq_test.a51
1,7 → 1,10
; irq_test.a51 -- First interrupt srvice test. |
; irq_test.a51 -- First interrupt service test. |
; |
; This program is meant to run on a light53 MCU with the 16-bit timer. It can be |
; run on simulation or in actual hardware. |
; This progam is only meant to work in the simulation test bench, because it |
; requires the external interrupt inputs to be wired to the P1 output port. |
; They are in the simulation test bench entity but not in the synthesizable |
; demo top entity. |
; |
; Its purpose is to demonstrate the working of the interrupt service logic. No |
; actual tests are performed (other than the co-simulation tests), only checks. |
; |
59,53 → 62,61
|
;---- External interrupt test -------------------------------------- |
|
; We'll be asserting the external interrupt request line 0, making |
; sure the interrupt enable flags work properly. No other interrupt |
; will be asserted simultaneously or while in the interrupt service |
; routine. |
|
; Trigger external IRQ with IRQs disabled, it should be ignored. |
mov P1,#01h |
mov P1,#01h ; Assert external interrupt line 0... |
nop ; ...give the CPU some time to acknowledge |
nop ; the interrupt... |
nop |
nop |
nop |
mov a,ext_irq_ctr |
mov a,ext_irq_ctr ; ...and then make sure it hasn't. |
cjne a,#00,fail_unexpected |
setb EXTINT0.0 ; Clear external IRQ flag |
|
; Trigger timer IRQ with external IRQ enabled but global IE disabled |
mov IE,#01h |
mov P1,#01h |
mov IE,#01h ; Enable external interrupt... |
mov P1,#01h ; ...and assert interrupt line. |
nop ; Wait a little... |
nop |
nop |
nop |
mov a,ext_irq_ctr |
cjne a,#00,fail_unexpected |
setb EXTINT0.0 ; Clear timer IRQ flag |
mov a,ext_irq_ctr ; ...and make sure the interrupt was NOT |
cjne a,#00,fail_unexpected ; serviced. |
setb EXTINT0.0 ; Clear timer IRQ flag |
|
; Trigger external IRQ with external and global IRQ enabled |
mov P1,#00h |
mov IE,#81h |
mov ext_irq_ctr,#00 |
mov P1,#01h |
mov P1,#00h ; Clear the external interrupt line... |
mov IE,#81h ; ...before enabling interrupts globally. |
mov ext_irq_ctr,#00 ; Reset the interrupt counter... |
mov P1,#01h ; ...and assert the external interrupt. |
nop ; Give it some time to be acknowledged... |
nop |
nop |
nop |
mov a,ext_irq_ctr |
mov a,ext_irq_ctr ; ...and make sure it has been serviced. |
cjne a,#01,fail_expected |
setb EXTINT0.0 ; Clear timer IRQ flag |
|
|
; End of irq test, print message and continue |
mov DPTR,#text2 |
call puts |
|
;---- Timer test --------------------------------------------------- |
; Assume the prescaler is set for a 20ms count period |
; Assume the prescaler is set for a 20us count period. |
|
mov IE,#000h |
; All we will do here is make sure the counter changes at the right |
; time, i.e. 20us after being started. We will NOT test the full |
; functionality of the timer (not in this version of the test). |
|
mov TSTAT,#00 |
mov TH,#00 |
mov TL,#00 |
mov TCH,#0c3h ; Compare register = 50000 = 1 second |
mov TCL,#050h |
mov TSTAT,#030h ; Start counting |
mov IE,#000h ; Disable all interrupts... |
; ...and put timer in |
mov TSTAT,#00 ; Stop timer... |
mov TH,#00 ; ...set counter = 0... |
mov TL,#00 ; |
mov TCH,#0c3h ; ...and set Compare register = 50000. |
mov TCL,#050h ; (50000 counts = 1 second) |
mov TSTAT,#030h ; Start counting. |
|
; Ok, now wait for a little less than 20us and make sure TH:TL has not |
; changed yet. |
158,6 → 169,8
mov IE,#00h |
ajmp $ |
|
; End of the test code. Now let's define a few utility routines. |
|
;-- puts: output to UART a zero-terminated string at DPTR ---------------------- |
puts: |
mov r0,#00h |
173,7 → 186,7
ret |
|
;-- irq_timer: interrupt routine for timer ------------------------------------- |
; Note we don't bother to preserve any registers |
; Note we don't bother to preserve any registers. |
irq_ext: |
mov P1,#00h ; Remove the external interrupt request |
mov EXTINT0,#0ffh ; Clear all external IRQ flags |
186,9 → 199,8
irq_wrong: |
ajmp irq_wrong |
|
; End of the utility routines. Define constant data and we're done. |
|
|
|
text0: db '<External irq>',13,10,00h,00h |
text1: db 'Unexpected IRQ',13,10,00h,00h |
text2: db 'IRQ test finished, no errors',13,10,0 |