请问为何要将TXD置低?
请问版主,为什么要将TXD置低,我在那些监听的数据里并没有看出要置低的迹象。我看您给的那些数据以单片机一开机就要向串口发00 00,可是我今天用串口监听软件去看没有收到00 00 监听软件有没有问题? 根据监听软件得出来的结果,这个TXD置低是通过了BREAK_ON来实现的。
0 9:40:06 MegawinUartIsp. IRP_MJ_CREATE Serial0 SUCCESS Options: Open
1 9:40:06 MegawinUartIsp. IRP_MJ_QUERY_INFORMATION Serial0 INVALID PARAMETER -141117524
2 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_BAUD_RATE Serial0 SUCCESS
3 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_LINE_CONTROL Serial0 SUCCESS
4 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_CHARS Serial0 SUCCESS
5 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_HANDFLOW Serial0 SUCCESS
6 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_BAUD_RATE Serial0 SUCCESS Rate: 1200
7 9:40:06 MegawinUartIsp. IOCTL_SERIAL_CLR_RTS Serial0 SUCCESS
8 9:40:06 MegawinUartIsp. IOCTL_SERIAL_CLR_DTR Serial0 SUCCESS
9 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_LINE_CONTROL Serial0 SUCCESS StopBits: ERROR Parity: NONE WordLength: 8
10 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_CHAR Serial0 SUCCESS EOF:0 ERR:0 BRK:0 EVT:0 XON:0 XOFF:0
11 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_HANDFLOW Serial0 SUCCESS Shake:0 Replace:0 XonLimit:0 XoffLimit:0
12 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: TXCLEAR
13 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: RXCLEAR
14 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: TXCLEAR
15 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: RXCLEAR
16 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 4D
17 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 50
18 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 43
19 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 49
20 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 53
21 9:40:06 MegawinUartIsp. IRP_MJ_WRITE Serial0 SUCCESS Length 1: 50
22 9:40:06 MegawinUartIsp. IRP_MJ_CLEANUP Serial0 SUCCESS
23 9:40:06 MegawinUartIsp. IRP_MJ_CLOSE Serial0 SUCCESS
24 9:40:06 MegawinUartIsp. IRP_MJ_CREATE Serial0 SUCCESS Options: Open
25 9:40:06 MegawinUartIsp. IRP_MJ_QUERY_INFORMATION Serial0 INVALID PARAMETER -141117524
26 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_BAUD_RATE Serial0 SUCCESS
27 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_LINE_CONTROL Serial0 SUCCESS
28 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_CHARS Serial0 SUCCESS
29 9:40:06 MegawinUartIsp. IOCTL_SERIAL_GET_HANDFLOW Serial0 SUCCESS
30 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_BAUD_RATE Serial0 SUCCESS Rate: 115200
31 9:40:06 MegawinUartIsp. IOCTL_SERIAL_CLR_RTS Serial0 SUCCESS
32 9:40:06 MegawinUartIsp. IOCTL_SERIAL_CLR_DTR Serial0 SUCCESS
33 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_LINE_CONTROL Serial0 SUCCESS StopBits: ERROR Parity: NONE WordLength: 8
34 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_CHAR Serial0 SUCCESS EOF:0 ERR:0 BRK:0 EVT:0 XON:0 XOFF:0
35 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_HANDFLOW Serial0 SUCCESS Shake:0 Replace:0 XonLimit:0 XoffLimit:0
36 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: TXCLEAR
37 9:40:06 MegawinUartIsp. IOCTL_SERIAL_PURGE Serial0 SUCCESS Purge: RXCLEAR
38 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
39 9:40:06 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
40 9:40:06 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
41 9:40:07 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
42 9:40:07 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
43 9:40:07 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
44 9:40:08 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
45 9:40:08 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
46 9:40:08 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
47 9:40:09 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
48 9:40:09 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
49 9:40:09 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
50 9:40:10 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
51 9:40:10 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
52 9:40:10 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
53 9:40:11 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
54 9:40:11 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
55 9:40:11 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
56 9:40:12 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
57 9:40:12 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
58 9:40:12 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
59 9:40:13 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
60 9:40:13 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
61 9:40:13 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
62 9:40:14 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
63 9:40:14 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
64 9:40:14 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
65 9:40:15 MegawinUartIsp. IOCTL_SERIAL_SET_BREAK_ON Serial0 SUCCESS
66 9:40:15 MegawinUartIsp. IOCTL_SERIAL_SET_TIMEOUTS Serial0 SUCCESS RI:0 RM:0 RC:1000 WM:0 WC:10
67 9:40:15 MegawinUartIsp. IRP_MJ_READ Serial0 TIMEOUT Length 0:
68 9:40:16 MegawinUartIsp. IRP_MJ_CLEANUP Serial0 SUCCESS
69 9:40:16 MegawinUartIsp. IRP_MJ_CLOSE Serial0 SUCCESS
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