//*****************************************************************************
//
// This function is called whenever serial data is received from the UART.
// It is passed the accumulated error flags from each character received in
// this interrupt and determines from them whether or not an interrupt
// notification to the host is required.
//
// If a notification is required and the control interrupt endpoint is idle,
// we send the notification immediately. If the endpoint is not idle, we
// accumulate the errors in a global variable which will be checked on
// completion of the previous notification and used to send a second one
// if necessary.
//
//*****************************************************************************
static void
CheckForSerialStateChange(const tUSBDCDCDevice *psDevice, uint32_t ui32Errors)
{
uint16_t ui16SerialState;
//
// Clear our USB serial state. Since we are faking the handshakes, always
// set the TXCARRIER (DSR) and RXCARRIER (DCD) bits.
//
ui16SerialState = USB_CDC_SERIAL_STATE_TXCARRIER |
USB_CDC_SERIAL_STATE_RXCARRIER;
//
// Are any error bits set?
//
if(ui32Errors)
{
//
// At least one error is being notified so translate from our hardware
// error bits into the correct state markers for the USB notification.
//
if(ui32Errors & UART_DR_OE)
{
ui16SerialState |= USB_CDC_SERIAL_STATE_OVERRUN;
}
if(ui32Errors & UART_DR_PE)
{
ui16SerialState |= USB_CDC_SERIAL_STATE_PARITY;
}
if(ui32Errors & UART_DR_FE)
{
ui16SerialState |= USB_CDC_SERIAL_STATE_FRAMING;
}
if(ui32Errors & UART_DR_BE)
{
ui16SerialState |= USB_CDC_SERIAL_STATE_BREAK;
}
//
// Call the CDC driver to notify the state change.
//
USBDCDCSerialStateChange((void *)psDevice, ui16SerialState);
}
}
static void CheckForSerialStateChange(const tUSBDCDCDevice *psDevice, int lErrors)
{
unsigned short usSerialState;
/* Clear our USB serial state. Since we are faking the handshakes, always
set the TXCARRIER (DSR) and RXCARRIER (DCD) bits.
*/
usSerialState = USB_CDC_SERIAL_STATE_TXCARRIER |
USB_CDC_SERIAL_STATE_RXCARRIER;
/* Are any error bits set? */
if(lErrors)
{
/* At least one error is being notified so translate from our hardware
error bits into the correct state markers for the USB notification.
*/
if(lErrors & UART_OVERRUN_ERROR)
{
usSerialState |= USB_CDC_SERIAL_STATE_OVERRUN;
}
if(lErrors & UART_PARITY_ERROR)
{
usSerialState |= USB_CDC_SERIAL_STATE_PARITY;
}
if(lErrors & UART_FRAMING_ERROR)
{
usSerialState |= USB_CDC_SERIAL_STATE_FRAMING;
}
if(lErrors & UART_BREAK_DETECTED_ERROR)
{
usSerialState |= USB_CDC_SERIAL_STATE_BREAK;
}
/* Call the CDC driver to notify the state change. */
USBDCDCSerialStateChange((void *)psDevice, usSerialState);
}
}
