working serialUSB with timeout

as a temporary workaround for the fact that SerialUSB is often blocking,
this crude implementation makes the low-level C usbSendBytes function
non-blocking (with a return code of bytes sent) and implements a 2ms
timeout in the wirish write() function.

also adds begin(), end(), getDTR(), getRTS(), pending(). device is still
initialized the old fashioned way during init() so that, eg, autoreset
will work. includes a simple multi-test program.

2 files changed, 7 insertions, 0 deletions

diff --git a/libmaple/usb/usb.c b/libmaple/usb/usb.c
index 6c010d9..881c7f9 100644
--- a/libmaple/usb/usb.c
+++ b/libmaple/usb/usb.c
@@ -120,7 +120,13 @@ void setupUSB (void) {
   /* initialize the usb application */
   gpio_write_bit(USB_DISC_BANK,USB_DISC_PIN,0);  /* present ourselves to the host */
   USB_Init();  /* low level init routine provided by st lib */
+}
 
+void disableUSB (void) {
+  // These are just guesses about how to do this
+  // TODO: real disable function
+  usbDsbISR();
+  gpio_write_bit(USB_DISC_BANK,USB_DISC_PIN,1); 
 }
 
 void usbSuspend(void) {
diff --git a/libmaple/usb/usb.h b/libmaple/usb/usb.h
index 66e820c..e0d4231 100644
--- a/libmaple/usb/usb.h
+++ b/libmaple/usb/usb.h
@@ -36,6 +36,7 @@ typedef enum
   extern volatile uint32 bDeviceState;
 
   void setupUSB(void);
+  void disableUSB(void);
   void usbSuspend(void);
   void usbResumeInit(void);
   void usbResume(RESUME_STATE);