X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstmf0%2Fao_adc_fast.h;h=c6903e9fcccb3b1d618eb29793bf861e87d6f659;hb=eee7fa303fb0d80ac5d7b9c5a86af60333f61951;hp=a2408d147914c3b471d3db455e50013beebb27a3;hpb=729bb7a405460db8d44c9ff6ee903b28c7499a02;p=fw%2Faltos

diff --git a/src/stmf0/ao_adc_fast.h b/src/stmf0/ao_adc_fast.h
index a2408d14..c6903e9f 100644
--- a/src/stmf0/ao_adc_fast.h
+++ b/src/stmf0/ao_adc_fast.h
@@ -24,4 +24,63 @@ ao_adc_read(uint16_t *dest, int len);
 void
 ao_adc_init(void);
 
+/* Total ring size in samples */
+#define AO_ADC_RING_SIZE	256
+
+extern uint16_t	ao_adc_ring[AO_ADC_RING_SIZE];
+
+#define ao_adc_ring_step(pos,inc)	(((pos) + (inc)) & (AO_ADC_RING_SIZE - 1))
+
+extern uint16_t	ao_adc_ring_head, ao_adc_ring_remain;
+extern uint16_t	ao_adc_running;
+
+/*
+ * Place to start fetching values from
+ */
+static inline uint16_t
+ao_adc_ring_tail(void)
+{
+	return (ao_adc_ring_head - ao_adc_ring_remain) & (AO_ADC_RING_SIZE - 1);
+}
+
+void
+_ao_adc_start(void);
+
+/*
+ * Space available to write ADC values into
+ */
+static inline uint16_t
+_ao_adc_space(void)
+{
+	/* Free to end of buffer? */
+	if (ao_adc_ring_remain <= ao_adc_ring_head)
+		return AO_ADC_RING_SIZE - ao_adc_ring_head;
+
+	/* no, return just the unused entries beyond head */
+	return AO_ADC_RING_SIZE - ao_adc_ring_remain;
+}
+
+static inline uint16_t
+ao_adc_get(uint16_t n)
+{
+	ao_arch_block_interrupts();
+	while (ao_adc_ring_remain < n) {
+		if (!ao_adc_running)
+			_ao_adc_start();
+		ao_sleep(&ao_adc_ring_head);
+	}
+	ao_arch_release_interrupts();
+	return ao_adc_ring_tail();
+}
+
+static inline void
+ao_adc_ack(uint16_t n)
+{
+	ao_arch_block_interrupts();
+	ao_adc_ring_remain -= n;
+	if (!ao_adc_running)
+		_ao_adc_start();
+	ao_arch_release_interrupts();
+}
+
 #endif /* _AO_ADC_FAST_H_ */