protodma.c

固件源代码 C52驱动编程源码学习中

#include <stdio.h>
#include <string.h>

#include "mainloop.h"
#include "Epphal.h"
#include "usb100.h"

extern CONTROL_XFER ControlData;
extern IO_REQUEST idata ioRequest;
extern EPPFLAGS bEPPflags;
extern BOOL bNoRAM;

extern void single_transmit(unsigned char * buf, unsigned char len);
extern void stall_ep0(void);

void get_firmware_version()
{
	unsigned char i;

	i = 0x30; // firmware version number
	single_transmit((unsigned char *)&i, 1);

}

void get_buffer_size()
{
	unsigned char i[4];

	if(bNoRAM == TRUE) {
		i[0] = EP2_PACKET_SIZE;
		i[1] = 0;
		i[2] = 0;
		i[3] = 0;
	} else {
		i[0] = 0;
		i[1] = 1;
		i[2] = 0;
		i[3] = 0;
	}
	single_transmit(i, 4);

}

void setup_dma_request()
{
	memcpy((unsigned char *)&ioRequest + ControlData.DeviceRequest.wValue,
		ControlData.dataBuffer,
		ControlData.DeviceRequest.wLength);

	ioRequest.uSize = SWAP(ioRequest.uSize);
	ioRequest.uAddressL = SWAP(ioRequest.uAddressL);

	if(ioRequest.uSize > DMA_BUFFER_SIZE) { // Unaccepted request
		stall_ep0();
	}
	else if(bNoRAM == TRUE && ioRequest.uSize > EP2_PACKET_SIZE) {
		stall_ep0();
	}
	else {
		if(bEPPflags.bits.dma_state == DMA_IDLE) {
			DISABLE;
			bEPPflags.bits.setup_dma ++;
			ENABLE;
		}
		else {
			DISABLE;
			bEPPflags.bits.dma_state = DMA_PENDING;
			ENABLE;
		}

	} // else if accepted request
}

void read_write_register(void)
{
	unsigned char i;

	if(ControlData.DeviceRequest.bmRequestType & (unsigned char)USB_ENDPOINT_DIRECTION_MASK) {

		if(bEPPflags.bits.verbose)
			printf("Read Registers: Offset = 0x%x, Length = 0x%x, Index = 0x%x.\n",
				ControlData.DeviceRequest.wValue,
				ControlData.DeviceRequest.wLength,
				ControlData.DeviceRequest.wIndex);

		if(ControlData.DeviceRequest.wIndex == GET_FIRMWARE_VERSION &&
			ControlData.DeviceRequest.wValue == 0 &&
			ControlData.DeviceRequest.wLength == 1)
			get_firmware_version();
		else
		if(ControlData.DeviceRequest.wIndex == GET_BUFFER_SIZE &&
			ControlData.DeviceRequest.wValue == 0 &&
			ControlData.DeviceRequest.wLength == 4)
			get_buffer_size();
		else
			stall_ep0();

	}	// if read register
	else{
		if(bEPPflags.bits.verbose) {

			//printf("Write Registers: Offset = 0x%x, Length = 0x%x, Index = 0x%x.\n",
			//	ControlData.DeviceRequest.wValue,
			//	ControlData.DeviceRequest.wLength,
			//	ControlData.DeviceRequest.wIndex);

			//printf("Data: ");
			for(i = 0; i < ControlData.DeviceRequest.wLength; i ++)
				printf("0x%bx, ", *((ControlData.dataBuffer)+i));
			printf("\n");
		}

		if(ControlData.DeviceRequest.wIndex == SETUP_DMA_REQUEST &&
			ControlData.DeviceRequest.wValue == 0 &&
			ControlData.DeviceRequest.wLength == 6)
			setup_dma_request();
			//stall_ep0();
		else
			stall_ep0();
	}	// if write register
}