Diff: uart.cpp

Revision:

3:accba7e07a0d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uart.cpp	Sat Apr 23 20:00:04 2016 +0000
@@ -0,0 +1,72 @@
+#include "mbed.h"
+static RawSerial uart(p9, p10); // tx, rx
+
+#define RECV_BUFFER_LENGTH 1024
+#define SEND_BUFFER_LENGTH 1024
+static char recvbuffer[RECV_BUFFER_LENGTH];
+static char sendbuffer[SEND_BUFFER_LENGTH];
+static char* pRecvPush; //Initialised in init
+static char* pRecvPull; //Initialised in init
+static char* pSendPush; //Initialised in init
+static char* pSendPull; //Initialised in init
+
+static void incrementPushPullPointer(char** pp, char* pbuffer, int bufferlength)
+{
+    ++*pp; //increment the pointer by one
+    if (*pp == pbuffer + bufferlength) *pp = pbuffer; //if the pointer is now beyond the end then point it back to the start
+}
+static void recvpush(void) //Called by the uart data received interrupt.
+{
+    while (uart.readable())
+    {
+        int c = uart.getc();
+        *pRecvPush = c;
+        incrementPushPullPointer(&pRecvPush, recvbuffer, RECV_BUFFER_LENGTH);
+    }
+}
+static int sendpull(void) //Called every scan by UartMain. Returns the next byte or EOF if no more are available
+{
+    if (pSendPull == pSendPush) return EOF;
+    char c = *pSendPull;
+    incrementPushPullPointer(&pSendPull, sendbuffer, SEND_BUFFER_LENGTH);
+    return c;
+}
+int UartRecvPull(void) //Returns the next byte or EOF if no more are available
+{
+    if (pRecvPull == pRecvPush) return EOF;
+    char c = *pRecvPull;
+    incrementPushPullPointer(&pRecvPull, recvbuffer, RECV_BUFFER_LENGTH); 
+    return c;
+}
+void UartSendPush(char c) //Called whenever something needs to be sent
+{
+    *pSendPush = c;
+    incrementPushPullPointer(&pSendPush, sendbuffer, SEND_BUFFER_LENGTH);
+}
+void UartBaud(int baud)
+{
+    uart.baud(baud);
+}
+void UartReset()
+{
+    pRecvPush = recvbuffer;
+    pRecvPull = recvbuffer;
+    pSendPush = sendbuffer;
+    pSendPull = sendbuffer;
+}
+int UartInit()
+{
+    UartReset();
+    uart.attach(&recvpush, Serial::RxIrq);
+    return 0;
+}
+int UartMain()
+{
+    while(uart.writeable())
+    {
+        int c = sendpull();
+        if (c == EOF) break;
+        uart.putc(c);
+    }
+    return 0;
+}
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