Nigel Leitzell
This program utilizes the mcr20 Thread Shield on the FRDM-K64F MCU which is a two-part workspace (HVAC Server (RX)/Probe(TX)) to handle low temperature events read at the probe(s) to prevent pipes from freezing.
Dependencies: DHT fsl_phy_mcr20a fsl_smac mbed-rtos mbed
Fork of
mcr20_wireless_uart
by 
NXP
Diff: circular_buffer.cpp
- Revision:
- 27:1eb29717bfd9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/circular_buffer.cpp Mon Jun 29 05:50:47 2015 +0000
@@ -0,0 +1,77 @@
+#include "circular_buffer.h"
+
+CircularBuffer::CircularBuffer()
+{
+ size = gCircularBufferSize_c;
+ readIndex = 0;
+ writeIndex = 0;
+ count = 0;
+ MEM_Init();
+ buffer = (uint8_t *) MEM_BufferAlloc(size * sizeof(uint8_t));
+ if ( NULL == buffer )
+ {
+ /*if buffer alloc fails stop the program execution*/
+ while(1);
+ }
+}
+
+CircularBuffer::CircularBuffer(uint32_t sz)
+{
+ size = sz;
+ readIndex = 0;
+ writeIndex = 0;
+ count = 0;
+ MEM_Init();
+ buffer = (uint8_t *) MEM_BufferAlloc(size * sizeof(uint8_t));
+ if ( NULL == buffer )
+ {
+ /*if buffer alloc fails stop the program execution*/
+ while(1);
+ }
+}
+
+CircularBuffer::~CircularBuffer()
+{
+ size = 0;
+ readIndex = 0;
+ writeIndex = 0;
+ count = 0;
+ MEM_BufferFree(buffer);
+}
+
+bufferStatus_t CircularBuffer :: addToBuffer (uint8_t c)
+{
+ buffer[writeIndex] = c;
+ writeIndex++;
+ if (writeIndex >= size)
+ {
+ writeIndex = 0;
+ }
+ count++;
+ if (count >= size)
+ {
+ return buffer_Full_c;
+ }
+ return buffer_Ok_c;
+}
+
+bufferStatus_t CircularBuffer :: getFromBuffer (uint8_t *c)
+{
+ if ( 0 == count )
+ {
+ return buffer_Empty_c;
+ }
+ (*c) = buffer[readIndex];
+ readIndex++;
+ if (readIndex >= size)
+ {
+ readIndex = 0;
+ }
+ count--;
+ return buffer_Ok_c;
+}
+
+uint32_t CircularBuffer :: getCount()
+{
+ return count;
+}
\ No newline at end of file