2021-07-11 09:49:42 +02:00
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; @language: Z80 ASM
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2020-12-06 15:51:26 +01:00
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SndTest_test:
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; ch1 max volume
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ld a,%10010000
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out (SND_DATA_REG),a
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; play note ch1
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ld a,%10000000
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out (SND_DATA_REG),a
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ld a,%00100000
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out (SND_DATA_REG),a
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; wait
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ld bc, 1200
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call Time_delay55
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; ch2 max volume
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ld a,%10110010
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out (SND_DATA_REG),a
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; play note ch2
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ld a,%10100000
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out (SND_DATA_REG),a
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ld a,%00010000
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out (SND_DATA_REG),a
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; wait
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ld bc, 1200
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call Time_delay55
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; ch3 max volume
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ld a,%11010100
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out (SND_DATA_REG),a
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; play note ch3
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ld a,%11000000
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out (SND_DATA_REG),a
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ld a,%00001000
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out (SND_DATA_REG),a
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; wait
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ld bc, 2400
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call Time_delay55
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; fade ch1,ch2,ch3
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ld d, 0 ; attenuation
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sndTest_fade: ; BROKEN!
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inc d
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; update ch1 atten
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ld a, d ; use A as attenuation
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and %10010000; place channel number in upper bits to compose attenuation byte
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out (SND_DATA_REG),a
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; update ch2 atten
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ld a, d ; use A as attenuation
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and %10110010; place channel number in upper bits to compose attenuation byte
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out (SND_DATA_REG),a
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; update ch3 atten
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ld a, d ; use A as attenuation
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and %11010100; place channel number in upper bits to compose attenuation byte
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out (SND_DATA_REG),a
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; wait
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ld bc, 100
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call Time_delay55
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; cycle until attenuation is 1111
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cp d %1111
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jp nz, sndTest_fade
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; wait
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ld bc, 2400
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call Time_delay55
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; play noise
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ret
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