Texas Instruments TMS320DM357 사용자 설명서

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The USB supports the following user cases:

Detailed information about the architecture and operation of the USB controller follows in

.

Programming examples are also provided for each of the operational modes of the controller.

User Case 1: An example of how to initialize the USB controller

// Routine to initialize USB controller

void usb_init()
{

// local loop variable
int I;

// VBUS must be controlled externally. The following routine
// should perform whatever actions are required (if any) to
// turn off VBUS in the system.
vbus_off();

// Reset the USB controller
usbRegs->CTRLR = 0x00000001;

// Power on PHY and oscillator by clearing bits 2, 1, and 0 of USBPHY_CTL
sysRegs->USB_PHY_CTRL = 0x000000D0;

//Clear all pending interrupts
usbRegs->INTCLRR = usbRegs->INTSRCR;

// Initialize CPPI DMA
usbRegs->RCPPICR = 0;

//Disable the RX DMA

usbRegs->TCPPICR = 0;

//Disable the TX DMA

// Initialize CPPI DMA state
for(I = 0; i<4; I++) {

usbRegs->CHANNEL[i].TCPPIDMASTATEW0 = 0;
usbRegs->CHANNEL[i].TCPPIDMASTATEW1 = 0;
usbRegs->CHANNEL[i].TCPPIDMASTATEW2 = 0;
usbRegs->CHANNEL[i].TCPPIDMASTATEW3 = 0;
usbRegs->CHANNEL[i].TCPPIDMASTATEW4 = 0;
usbRegs->CHANNEL[i].TCPPIDMASTATEW5 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW0 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW1 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW2 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW3 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW4 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW5 = 0;
usbRegs->CHANNEL[i].RCPPIDMASTATEW6 = 0;

}

}

16

SPRUGH3 – November 2008