Diff: modem.cpp

Revision:

0:515a38e245a4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modem.cpp	Tue Jan 13 15:48:44 2015 +0000
@@ -0,0 +1,54 @@
+
+#include "modem.h"
+
+
+Modem::Modem(PinName tx, PinName rx) : Serial(tx,rx)
+{
+    tx_in=0;
+    tx_out=0;
+    rx_in=0;
+    rx_out=0;
+
+    device_irqn = USART1_IRQn;
+
+    // attach the interrupts
+    Serial::attach(this, &Modem::Rx_interrupt, Serial::RxIrq);
+
+}
+
+
+// Read a line from the large rx buffer from rx interrupt routine
+void Modem::read_buf(char *c,int ln)
+{
+int i=0;
+// Start Critical Section - don't interrupt while changing global buffer variables
+    NVIC_DisableIRQ(USART1_IRQn);
+   
+    for (i=0;i<ln;i++){
+        *c=rx_buffer[i];
+        c++;
+    }
+    rx_out=0;
+    rx_in=0;
+    memset(rx_buffer,0,BUFFER_SIZE); 
+    NVIC_EnableIRQ(USART1_IRQn);
+    return;
+
+
+}
+
+// Interupt Routine to read in data from serial port
+void Modem::Rx_interrupt()
+{
+    // Loop just in case more than one character is in UART's receive FIFO buffer
+    // Stop if buffer full
+        while ((readable()) && (((rx_in + 1) % BUFFER_SIZE) != rx_out)) {
+            rx_buffer[rx_in] = getc();
+    //        pc.putc(rx_buffer[rx_in]);
+    // Uncomment to Echo to USB serial to watch data flow
+    //        monitor_device.putc(rx_buffer[rx_in]);
+            rx_in = (rx_in + 1) % BUFFER_SIZE;
+        }
+        return;
+}
+