define TARGET_BUFFER_LENGTH

sctanf · sctanf · commit fe5529a1953d · 2024-08-21T20:27:31.000-05:00
it can be set to -1 for some reason
this would mean that by the time core0 is ready to put data on the buffer, there is exactly no data on the buffer
diff --git a/i2s/audio_i2s.c b/i2s/audio_i2s.c
@@ -53,9 +53,12 @@ bufring2=bufring1;
 cpu_freq = freq;
 }
 
+// minimum target without popping: -1 (?)
+#define TARGET_BUFFER_LENGTH 0
+
 //uint32_t buflends[8192];
 void audioi2sconstuff2() {
-    uint32_t divider = (cpu_freq * 2 / 48000) - ((bufring2->len - 16)/2);
+    uint32_t divider = (cpu_freq * 2 / 48000) - ((bufring2->len - TARGET_BUFFER_LENGTH) / 2);
 //    buflends[bufring2->index1] = divider;
     pio_sm_set_clkdiv_int_frac(audio_pio, shared_state.pio_sm, divider >> 8u, divider & 0xffu);
 }

Original file line number	Diff line number	Diff line change
`@@ -53,9 +53,12 @@ bufring2=bufring1;`
`53`	`53`	`cpu_freq = freq;`
`54`	`54`	`}`
`55`	`55`
	`56`	`+// minimum target without popping: -1 (?)`
	`57`	`+#define TARGET_BUFFER_LENGTH 0`
	`58`	`+`
`56`	`59`	`//uint32_t buflends[8192];`
`57`	`60`	`void audioi2sconstuff2() {`
`58`		`- uint32_t divider = (cpu_freq * 2 / 48000) - ((bufring2->len - 16)/2);`
	`61`	`+ uint32_t divider = (cpu_freq * 2 / 48000) - ((bufring2->len - TARGET_BUFFER_LENGTH) / 2);`
`59`	`62`	`// buflends[bufring2->index1] = divider;`
`60`	`63`	`pio_sm_set_clkdiv_int_frac(audio_pio, shared_state.pio_sm, divider >> 8u, divider & 0xffu);`
`61`	`64`	`}`