//-----------------------------------------------------------------------------
static void
init_serial_channel(channel_data_t *chan)
{
XStatus stat;
XUartNs550Format fmt;
Xuint16 opt;
stat = XUartNs550_Initialize(&chan->dev, chan->dev_id);
if (stat != XST_SUCCESS) {
return; // What else can be done?
}
// Configure the port
fmt.BaudRate = CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD;
fmt.DataBits = XUN_FORMAT_8_BITS;
fmt.Parity = XUN_FORMAT_NO_PARITY;
fmt.StopBits = XUN_FORMAT_1_STOP_BIT;
stat = XUartNs550_SetDataFormat(&chan->dev, &fmt);
if (stat != XST_SUCCESS) {
return; // What else can be done?
}
opt = XUN_OPTION_FIFOS_ENABLE | XUN_OPTION_RESET_TX_FIFO | XUN_OPTION_RESET_RX_FIFO;
opt = 0;
stat = XUartNs550_SetOptions(&chan->dev, opt);
if (stat != XST_SUCCESS) {
return; // What else can be done?
}
XUartNs550_SetHandler(&chan->dev, cyg_hal_plf_serial_isr_handler, chan);
XUartNs550_SetFifoThreshold(&chan->dev, XUN_FIFO_TRIGGER_01);
chan->qlen = 0; // No characters buffered
chan->dev_ok = true;
}
/**
*
* This function does a minimal test on the UartNs550 device and driver as a
* design example. The purpose of this function is to illustrate how to use the
* XUartNs550 component.
*
* This function transmits data and expects to receive the same data through the
* UART using the local loopback of the hardware.
*
* This function uses interrupt driver mode of the UART.
*
* @param IntcInstancePtr is a pointer to the instance of the
* Interrupt Controller.
* @param UartInstancePtr is a pointer to the instance of the UART .
* @param UartDeviceId is the device Id and is typically
* XPAR_<UARTNS550_instance>_DEVICE_ID value from xparameters.h.
* @param UartIntrId is the interrupt Id and is typically
* XPAR_<INTC_instance>_<UARTNS550_instance>_IP2INTC_IRPT_INTR
* value from xparameters.h.
*
* @return XST_SUCCESS if successful, otherwise XST_FAILURE.
*
* @note
*
* This function contains an infinite loop such that if interrupts are not
* working it may never return.
*
*******************************************************************************/
int UartNs550IntrExample(XIntc *IntcInstancePtr,
XUartNs550 *UartInstancePtr,
u16 UartDeviceId,
u16 UartIntrId)
{
int Status;
u32 Index;
u16 Options;
u32 BadByteCount = 0;
/*
* Initialize the UART driver so that it's ready to use.
*/
Status = XUartNs550_Initialize(UartInstancePtr, UartDeviceId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Perform a self-test to ensure that the hardware was built correctly.
*/
Status = XUartNs550_SelfTest(UartInstancePtr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Connect the UART to the interrupt subsystem such that interrupts can
* occur. This function is application specific.
*/
Status = UartNs550SetupIntrSystem(IntcInstancePtr,
UartInstancePtr,
UartIntrId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup the handlers for the UART that will be called from the
* interrupt context when data has been sent and received, specify a
* pointer to the UART driver instance as the callback reference so
* the handlers are able to access the instance data.
*/
XUartNs550_SetHandler(UartInstancePtr, UartNs550IntrHandler,
UartInstancePtr);
/*
* Enable the interrupt of the UART so interrupts will occur, setup
* a local loopback so data that is sent will be received, and keep the
* FIFOs enabled.
*/
Options = XUN_OPTION_DATA_INTR | XUN_OPTION_LOOPBACK |
XUN_OPTION_FIFOS_ENABLE;
XUartNs550_SetOptions(UartInstancePtr, Options);
/*
* Initialize the send buffer bytes with a pattern to send and the
* the receive buffer bytes to zero to allow the receive data to be
* verified.
*/
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
SendBuffer[Index] = Index + 'A';
RecvBuffer[Index] = 0;
}
/*
* Start receiving data before sending it since there is a loopback,
* ignoring the number of bytes received as the return value since we
* know it will be zero and we are using interrupt mode.
*/
XUartNs550_Recv(UartInstancePtr, RecvBuffer, TEST_BUFFER_SIZE);
/*
* Send the buffer using the UART and ignore the number of bytes sent
* as the return value since we are using it in interrupt mode.
*/
XUartNs550_Send(UartInstancePtr, SendBuffer, TEST_BUFFER_SIZE);
/*
* Wait for the entire buffer to be received, letting the interrupt
* processing work in the background, this function may get locked
* up in this loop if the interrupts are not working correctly.
*/
while ((TotalReceivedCount != TEST_BUFFER_SIZE) ||
(TotalSentCount != TEST_BUFFER_SIZE)) {
}
/*
* Verify the entire receive buffer was successfully received.
*/
for (Index = 0; Index < TEST_BUFFER_SIZE; Index++) {
if (RecvBuffer[Index] != SendBuffer[Index]) {
BadByteCount++;
}
}
/*
* Disable the UartNs550 interrupt.
*/
UartNs550DisableIntrSystem(IntcInstancePtr, UartIntrId);
/*
* If any bytes were not correct, return an error.
*/
if (BadByteCount != 0) {
return XST_FAILURE;
}
return XST_SUCCESS;
}
