Diff: Handlers/UsbComms.cpp

Revision:

0:2df78a4443cd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Handlers/UsbComms.cpp	Sun Apr 10 15:47:33 2016 +1000
@@ -0,0 +1,125 @@
+#include "UsbComms.h"
+#include "mbed.h"
+
+#include "USBDevice.h"
+#include "USBSerial.h"
+
+#include "circbuff.h"
+
+#define USB_CIRC_BUFF 256
+
+extern DigitalOut myled1; // this led is used to notify state of USB comms
+
+UsbComms::UsbComms(MyTimers *_timer) : AbstractHandler(_timer)
+{
+    mode = usb_Start;
+
+    m_circBuff = new CircBuff(USB_CIRC_BUFF);
+
+    // Declare serial port for communication with PC over USB
+    _serial = new USBSerial;
+}
+
+UsbComms::~UsbComms()
+{
+    delete _serial;
+    delete m_circBuff;
+}
+
+void UsbComms::run()
+{
+    unsigned char temp;
+    switch(mode) {
+    case usb_Start:
+        mode = usb_CheckInput;
+        break;
+    case usb_CheckInput:
+        if (_serial->readable()) {
+            _serial->getc();
+            // todo: do something with it! this is where config events are started
+            // uncomment to print a message confirming input
+            // _serial->writeBlock((unsigned char*)"getc\r\n", 6);
+            //mode = usb_WaitForInput;
+            mode = usb_CheckOutput;
+        } else {
+            mode = usb_CheckOutput;
+        }
+        break;
+    case usb_CheckOutput:
+        if (m_circBuff->dataAvailable() && _serial->writeable()) {
+            // ensure only 64 bytes or less are written at a time
+            unsigned char s[TX_USB_MSG_MAX];
+            int len = m_circBuff->read(s, TX_USB_MSG_MAX);
+            _serial->writeBlock((unsigned char*)s, len);
+            myled1 = 1;
+
+        } else {
+            myled1 = 0;
+        }
+        mode = usb_CheckInput;
+        break;
+    }
+}
+
+void UsbComms::setRequest(int request, void *data)
+{
+    request_t req = (request_t)request;
+
+    switch (req) {
+    case usbreq_PrintToTerminal:
+        printToTerminal((char*)data);
+        break;
+    case usbreq_PrintToTerminalTimestamp:
+        printToTerminalEx((char*)data);
+        break;
+    }
+}
+
+void UsbComms::printToTerminal(char *s)
+{
+    // simply add this string to the circular buffer
+    m_circBuff->add((unsigned char*)s);
+}
+
+// print the message, but prepend it with a standard timestamp
+// YYYYMMDD HHMMSS: 
+// 01234567890123456
+void UsbComms::printToTerminalEx(char *s)
+{
+    unsigned char tempBuff[TX_USB_BUFF_SIZE];
+    // this won't work! needs to be a circular buffer...
+    uint16_t sSize = 0, i = 0, j = 0;
+
+    // get the length of the passed array (it should be null terminated, but include max buffer size for caution)
+    for (sSize = 0; (sSize < TX_USB_BUFF_SIZE) && (s[sSize] != 0); sSize++);
+
+
+    time_t _time = time(NULL); // get the seconds since dawn of time
+
+    // extract time_t to time info struct
+    struct tm * timeinfo = localtime(&_time);
+
+    // print the formatted timestamp at the start of terminalBuffer
+    sprintf((char*)&tempBuff[0], "%04d%02d%02d %02d%02d%02d:", (timeinfo->tm_year + 1900),
+            (timeinfo->tm_mon + 1),
+            timeinfo->tm_mday,
+            timeinfo->tm_hour,
+            timeinfo->tm_min,
+            timeinfo->tm_sec);
+
+
+    // copy the string into the remainder of the terminal buffer
+    for (i = 16; i < (16 + sSize); i++) {
+        tempBuff[i] = s[j++];
+    }
+
+    // add a carriage return and new line to the output buffer
+    tempBuff[i++] = '\r';
+    tempBuff[i++] = '\n';
+    tempBuff[i++] = 0;
+
+    // add it to the circular buffer
+    m_circBuff->add(tempBuff);
+}
+
+