Diff: buffered_serial.h

Revision:

0:707b9f3904dd

Child:

3:a4a21e18acd1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/buffered_serial.h	Mon Dec 10 23:42:38 2012 +0000
@@ -0,0 +1,54 @@
+/*
+    Buffered serial 1 - Setup to work with UART1 (p13,p14)
+*/
+
+#ifndef BUFFERED_SERIAL_H
+#define BUFFERED_SERIAL_H
+
+#define BUFFER_SIZE     255
+#define LINE_SIZE       80
+#define NEXT(x)         ((x+1)&BUFFER_SIZE)
+#define IS_TX_FULL      (((tx_in + 1) & BUFFER_SIZE) == tx_out)
+#define IS_RX_FULL      (((rx_in + 1) & BUFFER_SIZE) == rx_out)
+#define IS_RX_EMPTY     (rx_in == rx_out)
+
+#include "mbed.h"
+#include "rtos.h"
+
+class BufferedSerial : public Serial
+{
+public:
+    BufferedSerial(PinName tx, PinName rx);
+
+    void send_line(char*);
+    void read_line(char*);
+
+private:
+    void Tx_interrupt();
+    void Rx_interrupt();
+
+// for disabling the irq
+    IRQn device_irqn;
+    
+// Circular buffers for serial TX and RX data - used by interrupt routines
+// might need to increase buffer size for high baud rates
+    char tx_buffer[BUFFER_SIZE];
+    char rx_buffer[BUFFER_SIZE];
+// Circular buffer pointers
+// volatile makes read-modify-write atomic
+    volatile int tx_in;
+    volatile int tx_out;
+    volatile int rx_in;
+    volatile int rx_out;
+// Line buffers for sprintf and sscanf
+    char tx_line[LINE_SIZE];
+    char rx_line[LINE_SIZE];
+
+    DigitalOut led1;
+    DigitalOut led2;
+    
+    Semaphore rx_sem;
+    Semaphore tx_sem;
+};
+
+#endif
\ No newline at end of file