protodma.c

USB固件开发源程序,以单片机为核心,转贴的

#include "reg52.h"
#include "stdio.h"
#include "string.h"
#include "usb.h"

//extern xdata CONTROL_XFER ControlData;
//extern xdata IO_REQUEST ioRequest;
//extern xdata EPPFLAGS bEPPflags;

//extern void single_transmit(uchar * buf, uchar len);
//extern void stall_ep0(void);

void get_firmware_version()
{
	uchar i;

	i = 0x30; // 固件版本号,这个东西随便写，不过不能是0XFF，PC上可读取
	single_transmit((uchar *)&i, 1);

}

void get_buffer_size()
{
	uchar i[4];

#ifdef NoRam
		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;
#endif
	single_transmit(i, 4);

}
/*
void setup_dma_request()
{
	memcpy((uchar *)&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(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)
{
//	uchar i;
	//
	if(ControlData.DeviceRequest.bmRequestType & (uchar)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);
		//以下是获取版本号的厂商请求
		if(ControlData.DeviceRequest.wIndex == GET_FIRMWARE_VERSION &&
			ControlData.DeviceRequest.wValue == 0 &&
			ControlData.DeviceRequest.wLength == 1)
			get_firmware_version();
		else
		//获取缓冲，这个缓冲是直单片机中自定义的缓冲。USB驱动程序根据这个缓冲分包发数据,只在第一次插设备的时候有效，就是安装驱动的时候被调用到
		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");
		}
		//SETUP_DMA_REQUEST在非力谱官方程序上用于其DEMO程序的批量传输，这里已经没有实际作用
		//保留作参考，用户可以自己加上对应的处理函数
		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
}