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tweaks cx16 sample streaming example, also added a new one
This commit is contained in:
Irmen de Jong
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966b017670
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17f7b11148
@ -1195,6 +1195,7 @@ asmsub set_sprcol_irq_handler(uword address @AY) clobbers(A) {
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asmsub set_aflow_irq_handler(uword address @AY) clobbers(A) {
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; Sets the AFLOW irq handler to use with enable_irq_handlers(). Also enables AFLOW irqs.
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; NOTE: unless a proper irq handler is already running, you should enclose this call in set_irqd() / clear_irqd() to avoid system crashes.
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; NOTE: the handler itself must fill the audio fifo buffer to at least 25% full again (1 KB) or the aflow irq will keep triggering!
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%asm {{
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php
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sei
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@ -108,6 +108,7 @@ class TestCompilerOnExamplesCx16: FunSpec({
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"vtui/testvtui",
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"pcmaudio/play-adpcm",
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"pcmaudio/stream-wav",
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"pcmaudio/stream-pcm-simple",
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"pcmaudio/vumeter",
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"sprites/dragon",
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"sprites/dragons",
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@ -224,6 +224,8 @@ Here they are, all available in ``cx16``:
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``set_aflow_irq_handler (uword address)``
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Sets the audio buffer underrun interrupt handler routine. Also enables AFLOW interrupts.
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Note: the handler must fill the Vera's audio fifo buffer by itself with at least 25% worth of data (1 kb)
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otherwise the aflow irq keeps triggering.
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``disable_irq_handlers ()``
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Hand control back to the system default IRQ handler.
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124
examples/cx16/pcmaudio/stream-pcm-simple.p8
Normal file
124
examples/cx16/pcmaudio/stream-pcm-simple.p8
Normal file
@ -0,0 +1,124 @@
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; This program can stream a simple uncompressed PCM file from the sdcard.
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; Currently it has been set up to play a 16 bit stereo PCM file,
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; and it plays it in the given sample frequency typed in by the user.
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;
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; It uses a AFLOW irq handler to refill the vera's PCM fifo buffer,
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; and sets a flag that signals the main program to load the next block of
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; data from disk. It is problematic to call kernal I/O routines inside an irq handler,
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; otherwise the aflow handler itself could have loaded the pcm data straight into
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; the vera's fifo buffer. But this could lead to race conditions so we need explicit buffering.
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;
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; The IRQ handlers are installed using Prog8's support routines for irq handlers.
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; The sample data is simply read using diskio.f_read() routine, but that uses MACPTR internally for fast loads.
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%import diskio
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%import textio
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%option no_sysinit
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main {
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sub start() {
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str MUSIC_FILENAME = "?"*32
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txt.print("what sample rate (hz) do you want to play at: ")
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void txt.input_chars(MUSIC_FILENAME)
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music.vera_rate_hz = conv.str2uword(MUSIC_FILENAME)
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if music.vera_rate_hz==0
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music.vera_rate_hz=44100
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music.calculate_vera_rate(music.vera_rate_hz)
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txt.print("\nname of raw .pcm file to play on drive 8: ")
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while 0==txt.input_chars(MUSIC_FILENAME) {
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; until user types a name...
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}
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if diskio.f_open(MUSIC_FILENAME) {
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cx16.rombank(0)
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void diskio.fastmode(1)
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music.init()
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interrupts.setup()
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music.start()
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} else {
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txt.print("\nio error")
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}
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repeat {
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interrupts.wait()
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if interrupts.aflow {
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; read the next 1024 bytes of audio data into the buffer
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txt.chrout('.')
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if diskio.f_read(interrupts.audio_buffer, 1024) != 1024
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break
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interrupts.aflow = false
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}
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}
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}
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}
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interrupts {
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bool aflow
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uword audio_buffer = memory("audiobuffer", 1024, 0)
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sub setup() {
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aflow = false
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sys.memset(audio_buffer, 1024, 0)
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cx16.enable_irq_handlers(true)
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cx16.set_aflow_irq_handler(&aflow_handler)
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; no other irqs in this example.
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}
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asmsub wait() {
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%asm {{
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wai
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}}
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}
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sub aflow_handler() -> bool {
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; copy 1024 bytes of audio data from the buffer into vera's fifo, quickly!
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%asm {{
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lda p8v_audio_buffer
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sta _loop+1
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sta _lp2+1
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lda p8v_audio_buffer+1
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sta _loop+2
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sta _lp2+2
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ldx #4
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ldy #0
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_loop lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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_lp2 lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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bne _loop
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inc _loop+2
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inc _lp2+2
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dex
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bne _loop
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}}
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aflow = true ; signal main program to read the next block of audio data: it is unsafe to to I/O in a irq handler!
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return false
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}
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}
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music {
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uword vera_rate_hz
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ubyte vera_rate
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sub init() {
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cx16.VERA_AUDIO_RATE = 0 ; halt playback
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cx16.VERA_AUDIO_CTRL = %10111011 ; stereo 16 bit, volume 11
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}
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sub start() {
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cx16.VERA_AUDIO_RATE = vera_rate ; start playback
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}
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sub calculate_vera_rate(uword sample_rate) {
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const uword vera_freq_factor = 25_000_000 / 65536
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vera_rate = (sample_rate / vera_freq_factor) as ubyte + 1
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vera_rate_hz = vera_rate * vera_freq_factor
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}
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}
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@ -128,10 +128,6 @@ main {
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repeat {
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interrupts.wait()
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if interrupts.vsync {
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interrupts.vsync=false
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; ...do something triggered by vsync irq...
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}
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if interrupts.aflow {
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interrupts.aflow=false
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if not music.load_next_block(block_size)
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@ -158,13 +154,12 @@ interrupts {
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sub set_handler() {
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sys.set_irqd()
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cx16.CINV = &handler ; handles both AFLOW and VSYNC
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cx16.VERA_IEN = %00001001 ; enable AFLOW + VSYNC
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cx16.CINV = &handler ; handler for AFLOW
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cx16.VERA_IEN = %00001000 ; enable AFLOW only
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sys.clear_irqd()
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}
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bool aflow
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bool vsync
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asmsub wait() {
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%asm {{
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@ -173,6 +168,8 @@ interrupts {
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}
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sub handler() {
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; we only handle aflow in this example.
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if cx16.VERA_ISR & %00001000 !=0 {
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; Filling the fifo is the only way to clear the Aflow irq.
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; So we do this here, otherwise the aflow irq will keep triggering.
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@ -183,10 +180,6 @@ interrupts {
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cx16.restore_virtual_registers()
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aflow = true
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}
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if cx16.VERA_ISR & %00000001 !=0 {
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cx16.VERA_ISR = %00000001
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vsync = true
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}
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%asm {{
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ply
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@ -233,23 +226,30 @@ music {
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}
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asmsub uncompressed_block_8() {
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; optimized loop to put 1024 bytes of data into the fifo as fast as possible
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; converting unsigned wav 8 bit samples to signed 8 bit on the fly
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; copy 1024 bytes of audio data from the buffer into vera's fifo, quickly!
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; converting unsigned wav 8 bit samples to signed 8 bit on the fly.
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%asm {{
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lda p8v_buffer
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sta cx16.r0L
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sta _loop+1
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sta _lp2+1
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lda p8v_buffer+1
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sta cx16.r0H
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sta _loop+2
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sta _lp2+2
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ldx #4
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- ldy #0
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- lda (cx16.r0),y
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eor #$80 ; convert to signed 8-bit
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ldy #0
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_loop lda $ffff,y
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eor #$80 ; convert to signed
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sta cx16.VERA_AUDIO_DATA
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iny
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bne -
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inc cx16.r0H
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_lp2 lda $ffff,y
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eor #$80 ; convert to signed
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sta cx16.VERA_AUDIO_DATA
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iny
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bne _loop
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inc _loop+2
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inc _lp2+2
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dex
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bne --
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bne _loop
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rts
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}}
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@ -264,22 +264,27 @@ music {
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}
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asmsub uncompressed_block_16() {
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; optimized loop to put 1024 bytes of data into the fifo as fast as possible
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; copy 1024 bytes of audio data from the buffer into vera's fifo, quickly!
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%asm {{
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lda p8v_buffer
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sta cx16.r0L
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sta _loop+1
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sta _lp2+1
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lda p8v_buffer+1
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sta cx16.r0H
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sta _loop+2
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sta _lp2+2
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ldx #4
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- ldy #0
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- lda (cx16.r0),y
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ldy #0
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_loop lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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bne -
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inc cx16.r0H
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_lp2 lda $ffff,y
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sta cx16.VERA_AUDIO_DATA
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iny
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bne _loop
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inc _loop+2
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inc _lp2+2
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dex
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bne --
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rts
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bne _loop
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}}
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; original prog8 code:
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; uword @requirezp ptr = main.start.buffer
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