我的硬件是C8051F020与CH375B,作为USB Device与电脑相连。 用CH372EVT中的测试程序，发现 BulkTest和Speed372测试结果令人满意，传输率最大可到400K/S左右，也没有数据错误。 但是同样的硬件用Test目录下的测试程序test.c就不行，其实CH375端口读写函数都是一样的，其它硬件相关的设置都一样。 后来增加了 读写延时（WR,RD宽度），勉强可出数据，但是从电脑上发送数据后，要等几秒钟(3~4秒)才有数据传回来， 而且比较容易出错。 请问这种现象正常吗？是什么原因造成的？哪里找问题啊？ 请高手指点，谢谢! ================== BULK传输测试很好 ===================== C:\temp>BULKTEST
CH372/CH375 Bulk Data Test Program V1.1 , Copyright (C) W.ch 2004.12 test data correctness and USB speed *** Load DLL: CH375DLL.DLL *** CH375OpenDevice: 0# *** Step-0: notice MCU start test start test now *** Step-1: test data correctness: 5000 times, random length and data *** passed *** Step-2: test speed of download data: 2048KB data *** download speed = 306586.8 Bytes/Sec, total=2048000 bytes, time=6680 mS *** Step-3: test speed of upload data: 2048KB data *** upload speed = 390318.3 Bytes/Sec, total=2048000 bytes, time=5247 mS *** Total error = 0 *** CH375CloseDevice: 0
Exit.
C:\temp>SPEED372
CH372/CH375 Bulk Data Test Program V1.2 , Copyright (C) W.ch 2004.12 test data correctness and USB speed, use buffer upload mode *** Load DLL: CH375DLL.DLL *** CH375OpenDevice: 0# *** Step-0: notice MCU start test start test now *** Step-1: test data correctness: 1000 times, random length and data *** passed *** Step-2: test speed of download data: 2048KB data *** download speed = 287196.7 Bytes/Sec, total=2048000 bytes, time=7131 mS *** Step-3: test speed of upload data: 2048KB data *** upload speed = 415578.7 Bytes/Sec, total=2051712 bytes, time=4937 mS, 935 *** Total error = 0 *** CH375CloseDevice: 0
Exit.
============= test就很差 ======================= C:\temp>test
CH372/CH375 Bulk Data Test Program V1.1 , Copyright (C) W.ch 2004.12 test data correctness *** Load DLL: CH375DLL.DLL *** CH375OpenDevice: 0# *** Step-1: test data correctness: 10000000 times, random length and data S1-T2-C2 return length error: 0 (40)6CH,D6H,AEH... S1-T2-C6 return length error: 0 (13)EFH,57H,49H... S1-T0-C8 return length error: 0 (64)00H,00H,00H... S1-T2-C10 return length error: 0 (64)3H,E5H,3CH... S1-T0-C12 return length error: 0 (64)0H,00H,00H... S1-T3-C15 return length error: 0 (64)0H,A7H,54H... S1-T1-C17 return length error: 0 (39)FH,FFH,FFH... S1-T3-C19 return length error: 0 (64)FH,7EH,CAH... S1-T1-C21 return length error: 0 (45)FH,FFH,FFH... S1-T0-C24 return length error: 0 (46)0H,00H,00H... S1-T3-C27 return length error: 0 (64)DH,5AH,EAH... Cnt= 29, Len=38, Data: 21H,FFH,FFH,FFH,FFH,FFH...