commiting examples

Examples/NeoPixel Example/FIFO.c

@@ -0,0 +1,89 @@
+#include <stdint.h>
+#include "FIFO.h"
+
+#define FIFO_SUCCESS    1
+#define FIFO_FAIL       0
+#define SIZE         1024
+
+static uint8_t RX_buffer[SIZE];
+static uint8_t *RX_head, *RX_tail;
+static uint8_t TX_buffer[SIZE];
+static uint8_t *TX_head, *TX_tail;
+
+void FIFO_init(void)
+{
+	RX_head = RX_tail = &RX_buffer[0];	
+	TX_head = TX_tail = &TX_buffer[0];
+}
+
+int RX_FIFO_empty(void)
+{
+	return RX_head == RX_tail;	
+}
+
+int RX_FIFO_full(void)
+{
+	uint8_t *ptr = RX_tail + 1;
+	if (ptr == &RX_buffer[SIZE])
+		ptr = &RX_buffer[0];
+	return ptr == RX_head;
+}
+
+int RX_FIFO_count(void)
+{
+	return RX_tail >= RX_head ? RX_tail - RX_head : SIZE - (RX_head - RX_tail);
+}
+
+int RX_FIFO_put(uint8_t data)
+{
+	if (RX_FIFO_full())
+		return FIFO_FAIL;
+	*RX_tail++ = data;
+	if (RX_tail == &RX_buffer[SIZE])
+		RX_tail = &RX_buffer[0];
+	return FIFO_SUCCESS;
+}
+
+int RX_FIFO_get(uint8_t *data)
+{
+	if (RX_FIFO_empty())
+		return FIFO_FAIL;
+	*data = *RX_head++;
+	if (RX_head == &RX_buffer[SIZE])
+		RX_head = &RX_buffer[0];
+	return FIFO_SUCCESS;
+}
+
+
+int TX_FIFO_empty(void)
+{
+	return TX_head == TX_tail;	
+}
+
+int TX_FIFO_full(void)
+{
+	uint8_t *ptr = TX_tail + 1;
+	if (ptr == &TX_buffer[SIZE])
+		ptr = &TX_buffer[0];
+	return ptr == TX_head;
+}
+
+int TX_FIFO_put(uint8_t data)
+{
+	if (TX_FIFO_full())
+		return FIFO_FAIL;
+	*TX_tail++ = data;
+	if (TX_tail == &TX_buffer[SIZE])
+		TX_tail = &TX_buffer[0];
+	return FIFO_SUCCESS;
+}
+
+int TX_FIFO_get(uint8_t *data)
+{
+	if (TX_FIFO_empty())
+		return FIFO_FAIL;
+	*data = *TX_head++;
+	if (TX_head == &TX_buffer[SIZE])
+		TX_head = &TX_buffer[0];
+	return FIFO_SUCCESS;
+}