Texas Instruments TMS320DM357 manual Example 3. Programming the USB Endpoints in Host Mode

Introduction www.ti.com

User Case 3: An example of how to program the USB endpoints in host mode

Example 3. Programming the USB Endpoints in Host Mode

//DMA channel number. Valid values are 0, 1, 2, or 3. int CHAN_NUM = 0;

//Fifo sizes: uncomment the desired size.

//This example uses 64-byte fifo.

// int fifosize = 0;	// 8 bytes
// int fifosize = 1;	// 16	bytes
// int fifosize = 2;	// 32	bytes
int fifosize = 3;	// 64	bytes
// int fifosize = 4;	// 128 bytes
// int fifosize = 5;	// 256 bytes
// int fifosize = 6;	// 512 bytes
// int fifosize = 7;	// 1024		bytes
// int fifosize = 8;	// 2048		bytes
// int fifosize = 9;	// 4096		bytes

//FIFO address. Leave 64-bytes for endpoint 0. int fifo_start_address = 8;

//Uncomment the desired buffering. If double-buffer is selected, actual

//FIFO space will be twice the value listed above for fifosize.

//This example uses single buffer.

int double_buffer = 0; // Single-buffer

//int double_buffer = 1; // Double-buffer

//Set the following variable to the device endpoint type: CONTROL ISO BULK or IN int device_protocol = BULK;

//int device_protocol = ISO; //int device_protocol = INT;

//USB speeds #define LOW_SPEED 0 #define FULL_SPEED 1 #define HIGH_SPEED 2

//TXTYPE protocol #define CONTROL 0 #define ISO 1 #define BULK 2 #define INT 3

//For maximum packet size this formula will usually work, but it can also be

//set to another value if needed. If non power of 2 value is needed (such as

//1023) set it explicitly.

#define FIFO_MAXP 8*(1<<fifosize);

//Set the following variable to the device address. int device_address = 1;

//Set the following variable to the device endpoint number. int device_ep = 1;

//Variable used for endpoint configuration

Uint8 type = 0;

//Variable to keep track of errors int error = 0;

//The following code should be run after resetting the attached device

//Initialize the endpoint FIFO. RX and TX will be allocated the same sizes. usbRegs->INDEX = CHAN_NUM+1;

usbRegs->RXFIFOSZ = fifosize ((double_buffer & 1)<<4); usbRegs->RXFIFOADDR = fifo_start_address;

18	Universal Serial Bus (USB) Controller	SPRUGH3–November 2008
		Submit Documentation Feedback