void cdc_task(void)
{
if(Is_device_enumerated()) //Enumeration processs OK ?
{
if(cpt_sof>=NB_MS_BEFORE_FLUSH && tx_counter!=0 ) //Flush buffer in Timeout
{
cpt_sof=0;
uart_usb_flush();
}
if ( waiting_to_start && uart_usb_test_hit()) // Something received from the USB ?
{
waiting_to_start = 0;
timer_init();
adc_init();
}
if( !waiting_to_start )
{
READING r;
if( cb_pop( &r ) )
{
uart_usb_putchar( (r.voltage >> 8) & 0xFF );
uart_usb_putchar( r.voltage & 0xFF );
uart_usb_putchar( (r.current >> 8) & 0xFF );
uart_usb_putchar( r.current & 0xFF );
uint16 checksum = r.voltage ^ r.current;
uart_usb_putchar( (checksum >> 8) & 0xFF );
uart_usb_putchar( checksum & 0xFF );
}
}
/**
* @brief This function reads one byte from the USB bus
*
* If one byte is present in the USB fifo, this byte is returned. If no data
* is present in the USB fifo, this function waits for USB data.
*
* @return U8 byte received
*/
char uart_usb_getchar(void)
{
register Uchar data_rx;
// Preserve the currently selected endpoint
uint8_t uenum = Usb_get_selected_endpoint();
Usb_select_endpoint(VCP_RX_EP);
if (!rx_counter) while (!uart_usb_test_hit());
data_rx=Usb_read_byte();
rx_counter--;
if (!rx_counter) Usb_ack_receive_out();
#if USB_CDC_ACM_CONF_LOCAL_ECHO
//Local echo
uart_usb_putchar(data_rx);
#endif
USB_CDC_ACM_HOOK_RX(data_rx);
// Restore previously selected endpoint
UENUM = uenum;
return data_rx;
}
int usb_stdout_putchar(char c, FILE *stream)
{
// No need to preserve the currently
// selected endpoint here because this
// function doesn't directly touch any
// USB registers.
if(c=='\n')
uart_usb_putchar('\r');
if(c!='\r')
uart_usb_putchar(c);
// Flush on newline.
if(c=='\n')
uart_usb_flush();
return 0;
}
