uint16_t SendBuffer(char *buf,uint16_t length )
{
uint8_t ReceiveError = 0, SendError = 0;
uint16_t count;
// Check the USB state and directly main loop accordingly
switch (USB_getConnectionState())
{
// This case is executed while your device is enumerated on the
// USB host
case ST_ENUM_ACTIVE:
if (USBCDC_sendDataInBackground((uint8_t*)buf, length, CDC0_INTFNUM, 1))
{
SendError = 0x01;
break;
}
break;
default:;
}
if (ReceiveError || SendError){
// TO DO: User can place code here to handle error
}
return 0;
}
/*
* ======== main ========
*/
void main(void)
{
WDT_A_hold(WDT_A_BASE); //Stop watchdog timer
// Minimum Vcore setting required for the USB API is PMM_CORE_LEVEL_2
PMM_setVCore(PMM_CORE_LEVEL_2);
USBHAL_initPorts(); // Config GPIOS for low-power (output low)
USBHAL_initClocks(8000000); // Config clocks. MCLK=SMCLK=FLL=8MHz; ACLK=REFO=32kHz
USB_setup(TRUE,TRUE); // Init USB & events; if a host is present, connect
initRTC(); // Start the real-time clock
__enable_interrupt(); // Enable interrupts globally
int prevLeft = getLeft();
int prevRight = getRight();
int left;
int right;
while (1)
{
// Enter LPM0, which keeps the DCO/FLL active but shuts off the
// CPU. For USB, you can't go below LPM0!
__bis_SR_register(LPM0_bits + GIE);
// If USB is present, sent the time to the host. Flag is set every sec
left = getLeft();
right = getRight();
timeStr[0] = '[';
itoa(left, &timeStr[1], 10);
itoa(right, &timeStr[2], 10);
timeStr[3] = ']';
timeStr[4] = '\n';
timeStr[5] = '\0';
//
// if (bSendTimeToHost)
// {
// bSendTimeToHost = FALSE;
// convertTimeBinToASCII(timeStr);
// This function begins the USB send operation, and immediately
// returns, while the sending happens in the background.
// Send timeStr, 9 bytes, to intf #0 (which is enumerated as a
// COM port). 1000 retries. (Retries will be attempted if the
// previous send hasn't completed yet). If the bus isn't present,
// it simply returns and does nothing.
if (USBCDC_sendDataInBackground(timeStr, 6, CDC0_INTFNUM, 1000))
{
_NOP(); // If it fails, it'll end up here. Could happen if
// the cable was detached after the connectionState()
} // check, or if somehow the retries failed
// }
} //while(1)
} //main()
uint16_t checkUSB(char * buf)
{
uint8_t ReceiveError = 0, SendError = 0;
uint16_t count;
// Check the USB state and directly main loop accordingly
switch (USB_getConnectionState())
{
// This case is executed while your device is enumerated on the
// USB host
case ST_ENUM_ACTIVE:
if (bCDCDataReceived_event){
// Clear flag early -- just in case execution breaks
// below because of an error
bCDCDataReceived_event = FALSE;
count = USBCDC_receiveDataInBuffer((uint8_t*)buf,
BUFFER_SIZE,
CDC0_INTFNUM);
// Count has the number of bytes received into dataBuffer
// Echo back to the host.
if (USBCDC_sendDataInBackground((uint8_t*)buf,
count, CDC0_INTFNUM, 1)){
// Exit if something went wrong.
SendError = 0x01;
break;
}
}
break;
default:;
}
if (ReceiveError || SendError){
// TO DO: User can place code here to handle error
}
}
