Cypress EX-USB FX3 - Page 91

FX3 Programmers Manual, Doc. # 001-64707 Rev. *C 91
FX3 Application Structure
❐ The verbosity of the debug. This is set to level 8, so all debug prints which are below this level
(0 to 7) will be printed.
/* Initialize the Debug application */
apiRetStatus = CyU3PDebugInit
(CY_U3P_LPP_SOCKET_UART_CONS, 8);
8.1.2.3 Application initialization
The application initialization consists of the following steps:
■ GPIF-II Initialization
■ USB Initialization
GPIF-II Initialization
The GPIF-II block is first initialized.
/* Initialize the P-port Block */
pibClock.clkDiv = 2;
pibClock.clkSrc = CY_U3P_SYS_CLK;
pibClock.isHalfDiv = CyFalse;
pibClock.isDllEnable = CyFalse;
apiRetStatus = CyU3PPibInit(CyTrue,&pibClock);
The slave FIFO descriptors are loaded into the GPIF-II registers and the state machine is started.
/* Load the GPIF configuration for Slave FIFO sync mode. */
apiRetStatus = CyU3PGpifLoad (&Sync_Slave_Fifo_2Bit_CyFxGpifConfig);
if (apiRetStatus != CY_U3P_SUCCESS)
{
CyU3PDebugPrint (4, "CyU3PGpifLoad failed, Error Code = %d\n",apiR-
etStatus);
CyFxAppErrorHandler(apiRetStatus);
}
/* Start the state machine. */
apiRetStatus = CyU3PGpifSMStart (SYNC_SLAVE_FIFO_2BIT_RESET,
SYNC_SLAVE_FIFO_2BIT_ALPHA_RESET);
if (apiRetStatus != CY_U3P_SUCCESS)
{
CyU3PDebugPrint (4, "CyU3PGpifSMStart failed, Error Code =
%d\n",apiRetStatus);
CyFxAppErrorHandler(apiRetStatus);
}
USB Initialization
■ The USB stack in the FX3 library is first initialized. This is done by invoking the USB Start
function.
/* Start the USB functionality */
apiRetStatus = CyU3PUsbStart();