问题描述
你好
我有一个通过蓝牙进行通讯的脉搏血氧饱和度测定仪
我的c ++程序可以通过COM3将其连接，并尝试检索其数据(脉冲率和饱和氧气).
但是设备的数据格式混乱.这是数据格式的说明:
9560包含6个字节的标题信息，最少14个字节的抽查数据和2个字节的页脚信息.
为了确定可扩展Spot-check数据的总长度，主机必须从标头的字节5和6中捕获数据长度.
在最小数据长度为14的情况下，字节5和6中定义的数据长度将为
(0x00)(0x0E)(十进制14字节).
抽查数据由??组成.抽查时间，SpO2，脉搏频率和状态.
Hello
I have a pulse oximetry device which communicate via bluetooth
my c++ program can connect it via COM3, and tries to retrieve its data(pulse rate and oxygen sat.)
but the data format of device is confused. here is the remark of data format:
The 9560 includes 6 bytes of header information, a minimum of 14 bytes of spot-check data, and 2 bytes of footer information.
To determine the total length for the expandable Spot-check data, the host must capture the data length from bytes 5 and 6 of the header.
With the minimum data length of 14, the data length defined in bytes 5 and 6 will be
(0x00) (0x0E) (14 bytes decimal).
The Spot-check data consists of time of spot-check, SpO2, Pulse Rate, and status.
Byte# Data Information Format
1 00 NULL start Hex
2 02 STX start of pocket Hex
Header 3 00 Packet type MSB Hex
4 0D Packet type LSB Hex
5 00 *Data Length MSB (variable) Hex
6 0E *Data Length LSB (variable) Hex
7 20 Hundredths place of Year BCD
8 Year of Measurement Year of Measurement BCD
9 Month of Measurement Month of Measurement BCD
10 Day of Measurement Day of Measurement BCD
11 Hour of Measurement Hour of Measurement (00-23) BCD
expandable 12 Minute of Measurement Minute of Measurement (00-59) BCD
Spot-check 13 Second of Measurement Second of Measurement (00-59) BCD
data 14 00 Fraction of second BCD
15 STATUS MSB See STATUS specification below Hex
16 STATUS LSB See STATUS specification below Hex
17 Pulse Rate MSB See HR format below Hex
18 Pulse Rate LSB See HR format below Hex
19 00 to FF Reserved for future use Hex
20 SpO2 See SpO2 format below Hex
footer 21 Checksum LSB LSB of sum Footer of Spot-check Data Hex
22 03 ETX end of transmission Hex
我的代码的一部分:
part of my code:
char buf[22];
DWORD read = 0;
if (ReadFile(comport,&buf,22,&read,NULL)){
DWORD i;
for(i=0;i<read;i++){
printf(" %d\n", (unsigned char)buf[i]);
}
printf("\n");
}else {printf("cannot read...");}
我得到这样的输出:
1 128 112 0 241 1 128 112 98 83 1 128 111 147 131 1 128 111 0 240 1 128
您能帮我如何以正确的格式读取和打印数据吗?
谢谢
我用以下命令打开端口:
I get output like this:
1 128 112 0 241 1 128 112 98 83 1 128 111 147 131 1 128 111 0 240 1 128
Could you please help me how to read and print data in correct format
thanks
i open the port with:
if ((comport = CreateFile("\\\\.\\COM3", // open com3:
GENERIC_READ | GENERIC_WRITE, // for reading and writing
0, // exclusive access
NULL, // no security attributes
OPEN_EXISTING,
0,
0)) == INVALID_HANDLE_VALUE)
{
printf("cannot open the port\n");
}
推荐答案
unsigned char buf[22];
DWORD read = 0;
if (ReadFile(comport, buf, 22, &read, NULL))
{
DWORD i;
for(i=0; i < read; i++)
{
printf(" %X", buf[i]);
}
printf("\n");
}
else
{
DWORD dwError = GetLastError();
printf("Error %d\n", dwError);
}
如果您的阅读失败，您应该能够看到原因.
If your read fails you should be able to see the reason why.
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