sw: outline of serial device

Signed-off-by: Sean Cross <sean@xobs.io>

sw/src/main.c

@@ -41,6 +41,9 @@ int main(int argc, char **argv)
     while (1)
     {
         usb_poll();
+        if (cdc_connected()) {
+            tester_poll();
+        }
     }
     return 0;
 }

sw/src/tester.c

@@ -0,0 +1,5 @@
+#include <tester.h>
+
+void tester_poll(void) {
+    return;
+}

sw/src/usb-cdc.c

@@ -0,0 +1,13 @@
+#include <usb-cdc.h>
+
+static int connected = 0;
+
+int cdc_connected(void)
+{
+    return connected;
+}
+
+void cdc_set_connected(int is_connected)
+{
+    connected = is_connected;
+}

sw/src/usb-setup.c

@@ -3,6 +3,7 @@
 #include <usb.h>
 
 #include <usb-desc.h>
+#include <usb-cdc.h>
 
 static uint8_t reply_buffer[8];
 static uint8_t usb_configuration = 0;
@@ -15,6 +16,14 @@ void usb_setup(const struct usb_setup_request *setup)
 
     switch (setup->wRequestAndType)
     {
+
+    case 0x2021: // Set Line Coding
+        break;
+
+    case 0x2221: // Set control line state
+        cdc_set_connected(setup->wValue & 1); /* Check RTS bit */
+        break;
+
     case 0x0500: // SET_ADDRESS
     case 0x0b01: // SET_INTERFACE
         break;