u8?length;
u8?i;

#define?AUTO

#ifndef????AUTO
????//自動(dòng)獲取
????xWriteCH376Cmd(CMD1H_GET_DESCR);?//0x46
????xWriteCH376Data(1);
????xEndCH376Cmd();
#else
????//?手動(dòng)傳輸
????xWriteCH376Cmd(CMD10_WR_USB_DATA7);?//0x2B
????xWriteCH376Data(0x08);?//寫(xiě)入數(shù)據(jù)長(zhǎng)度

????xWriteCH376Data(0x80);?//?bmRequestType?主機(jī)向設(shè)備發(fā)送
????xWriteCH376Data(0x06);?//?bRequest?GET_DESCRIPTOR
????xWriteCH376Data(0x00);?//?wValueL?
????xWriteCH376Data(0x01);?//?wValueH
????xWriteCH376Data(0x00);?//?wIndexL
????xWriteCH376Data(0x00);?//?wIndexH
????xWriteCH376Data(0x12);?//?wLengthL
????xWriteCH376Data(0x00);?//?wLengthH

????xWriteCH376Cmd(CMD2H_ISSUE_TKN_X);?//0x4E
????xWriteCH376Data(0x00);?//?同步標(biāo)志
????xWriteCH376Data(0x0D);?//?發(fā)起控制傳輸
#endif


if(Wait376Interrupt()?==?USB_INT_SUCCESS)
{
????xWriteCH376Cmd(CMD01_RD_USB_DATA);?//0x28
????length?=?xReadCH376Data();
????printf("length?=?%.2x\n",?length);
????for(i=0;?i?<?length;?++i)
????{
????????printf("%.2x?",?xReadCH376Data());
????}
????printf("\n");
????xEndCH376Cmd();
}

使用CMD1H_GET_DESCR指令獲取設(shè)備描述符正確獲取了設(shè)備描述符。

但嘗試使用控制傳輸手動(dòng)獲取時(shí)，出現(xiàn)了異常，返回的數(shù)據(jù)長(zhǎng)度為0x7E（十進(jìn)制126）,并且可以讀出長(zhǎng)度為0x7E的垃圾數(shù)據(jù)。

根據(jù)手冊(cè)，RD_USB_DATA返回的數(shù)據(jù)塊長(zhǎng)度的有效值是0～64。

USART與SPI連接模式都有此問(wèn)題。

什么原因?qū)е马憫?yīng)數(shù)據(jù)異常？請(qǐng)各位大佬解惑。

您好，看您的這個(gè)代碼，不知道您是否為1字節(jié)1字節(jié)的發(fā)送的？（主要不清楚您xWrite376Data函數(shù)）。您可以發(fā)送郵件至mj@wch.cn。這邊可以給您提供376手動(dòng)拼包的例程。