Texas Instruments TMS320DM357 manual Example 2. Programming the USB Endpoints in Peripheral Mode

www.ti.com Introduction

User Case 2: An example of how to program the USB Endpoints in peripheral mode

Example 2. Programming the USB Endpoints in Peripheral 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

//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 = 0;

//The following code should be run after receiving a USB reset from the host.

//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;

usbRegs->TXFIFOSZ = fifosize ((double_buffer & 1)<<4); usbRegs->TXFIFOADDR = fifo_start_address + (1<<(fifosize+double_buffer)); usbRegs->RXMAXP = FIFO_MAXP;

usbRegs->TXMAXP = FIFO_MAXP;

//Force Data Toggle is optional for interrupt traffic. Uncomment if needed.

//CSL_FINS(usbRegs->PERI_TXCSR,USB_PERI_TXCSR_FRCDATATOG,1);

//Uncomment below to configure the endpoint for ISO and not respond with a

//handshake packet.

//CSL_FINS(usbRegs->PERI_RXCSR,USB_PERI_RXCSR_ISO,1);

//CSL_FINS(usbRegs->PERI_TXCSR,USB_PERI_TXCSR_ISO,1);

//After receiving a successful set-address command, set the following register

//to the specified address immediately following the status stage.

usbRegs->FADDR = device_address;

SPRUGH3–November 2008 Universal Serial Bus (USB) Controller 17

Submit Documentation Feedback