Diff: main.cpp

Revision:

0:b44aebdb4d65

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 14 07:31:51 2018 +0000
@@ -0,0 +1,79 @@
+#include "mbed.h"
+#include "USBSerial.h"
+#include "USBMSD.h"
+
+// Ring buffer for serial RX data - used by interrupt routines
+#define SERIAL_RX_BUFF_LEN 2047
+// might need to increase buffer size for high baud rates
+char serial_rx_buffer[SERIAL_RX_BUFF_LEN+1];
+// Ring buffer pointers
+// volatile makes read-modify-write atomic 
+volatile int serial_rx_in_inx=0;
+volatile int serial_rx_out_inx=0;
+
+// might need to increase buffer size for high baud rates
+char vcp_rx_buffer[SERIAL_RX_BUFF_LEN+1];
+// Ring buffer pointers
+// volatile makes read-modify-write atomic 
+volatile int vcp_rx_in_inx=0;
+volatile int vcp_rx_out_inx=0;
+
+USBSerial vcp2;
+USBSerial vcp3;
+USBSerial vcp;
+
+RawSerial pc(SERIAL_TX, SERIAL_RX, 115200);
+
+DigitalOut led1(LED1), led2(LED2), led3(LED3);
+
+// Interupt Routine to read in data from serial port
+void vcp_rx_isr_handler( void )
+{
+    led2 = !led2;
+// Loop just in case more than one character is in UART's receive FIFO buffer
+// Stop if buffer full
+    while( vcp.readable() && ( (vcp_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN != vcp_rx_out_inx ) )
+    {
+        vcp_rx_buffer[vcp_rx_in_inx] = vcp.getc();        
+        vcp_rx_in_inx = (vcp_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN;
+    }
+    return;
+}
+
+// Interupt Routine to read in data from serial port
+void serial_rx_isr_handler( void )
+{
+    led3 = !led3;
+// Loop just in case more than one character is in UART's receive FIFO buffer
+// Stop if buffer full
+    while( pc.readable() && ( (serial_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN != serial_rx_out_inx ) )
+    {
+        serial_rx_buffer[serial_rx_in_inx] = pc.getc();        
+        serial_rx_in_inx = (serial_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN;
+    }
+    return;
+}
+
+
+int main(void)
+{   
+    pc.attach(&serial_rx_isr_handler, Serial::RxIrq);
+    vcp.attach(&vcp_rx_isr_handler);
+    pc.printf("\n\r\n\r\n\r========== USB Device Test ==========\n\r\n\r");    
+    vcp.printf("\n\r\n\r\n\r========== USB Device Test ==========\n\r\n\r");
+    while (1)
+    {
+        while( serial_rx_in_inx != serial_rx_out_inx )
+        {
+            vcp.putc(serial_rx_buffer[serial_rx_out_inx]);
+            serial_rx_out_inx = (serial_rx_out_inx + 1) % SERIAL_RX_BUFF_LEN;
+            led1 = !led1;
+        }
+        while( vcp_rx_in_inx != vcp_rx_out_inx )
+        {
+            pc.putc(vcp_rx_buffer[vcp_rx_out_inx]);
+            vcp_rx_out_inx = (vcp_rx_out_inx + 1) % SERIAL_RX_BUFF_LEN;
+            led1 = !led1;
+        }
+    }
+}