incdir "tests"
include "dsp_base.inc"

; Tests the behavior of SI, SRS, and LRS when CR is changed

; Register that is writable but with contents that doesn't matter (COEF_A1_0)
TEST_REG: equ 0xFFA0 ; 0xFF00 (not writable)
; This is separate because SRS and SI currently require value 0..7f or ff80..ffff,
; though the actual behavior doesn't match that
TEST_ADDR: equ 0xFFA0 ; 0x0000
; Memory addresses
TEST_MEM: equ 0x00A0 ; 0x0000
TEST_MEM_2: equ 0x01A0 ; 0x0100

test_main:
	LRI $AC0.L, #0xf00f
	SR @TEST_REG, $AC0.L
	SR @TEST_MEM, $AC0.L
	SR @TEST_MEM_2, $AC0.L
	CALL send_regs

	; Observed: writes to TEST_REG
	SI @TEST_ADDR, #0xf11f
	CALL send_regs

	LRI $AC0.L, #0xf22f
	; Observed: writes to TEST_REG
	SRS @TEST_ADDR, $AC0.L
	CALL send_regs

	LRI $CR, #0x0000
	; Observed: still writes to TEST_REG
	SI @TEST_ADDR, #0xf33f
	CALL send_regs

	LRI $AC0.L, #0xf44f
	; Observed: writes to TEST_MEM
	SRS @TEST_ADDR, $AC0.L
	CALL send_regs

	LRI $CR, #0x0001
	; Observed: still writes to TEST_REG
	SI @TEST_ADDR, #0xf55f
	CALL send_regs

	LRI $AC0.L, #0xf66f
	; Observed: writes to TEST_MEM_2
	SRS @TEST_ADDR, $AC0.L
	CALL send_regs

	; At this point, TEST_REG should be f55f, TEST_MEM should be f44f,
	; and TEST_MEM_2 should be f66f.  Test the behavior of LRS.
	; Changes to prod.l are for display only.
	LRI $CR, #0x00ff
	LRI $prod.l, #0xf55f
	LRS $AC0.L, @TEST_ADDR
	CALL send_regs

	LRI $CR, #0x0000
	LRI $prod.l, #0xf44f
	LRS $AC0.L, @TEST_ADDR
	CALL send_regs

	LRI $CR, #0x0001
	LRI $prod.l, #0xf66f
	LRS $AC0.L, @TEST_ADDR
	CALL send_regs

; We're done, DO NOT DELETE THIS LINE
	JMP end_of_test

send_regs:
	; For display purposes only
	LRI $prod.m1, #TEST_REG
	LRI $prod.h,  #TEST_MEM
	LRI $prod.m2, #TEST_MEM_2
	; Actual registers
	LR $AC1.L, @TEST_REG
	LR $AC0.M, @TEST_MEM
	LR $AC1.M, @TEST_MEM_2
	CALL send_back
	RET