[英]How do I send a payload to an XBee
I have implemented the following code on an embedded platform that attempts to communicate with an XBee . 我已经在尝试与XBee通信的嵌入式平台上实现了以下代码。 The embedded platform that executes the code below is not an xbee:
执行以下代码的嵌入式平台不是 xbee:
int main()
{
char payload[12] = {0x61,0x88,0x00,0x64,0x00,0x00,0x00,0x00,0x00,0xEC,0x00,0x00}
payload[2] = 0x10;
payload[9] = 0x01;
char data = 'H'; // Send simple ASCII character to XBee
payload[11]= data;
while (1)
sendByteofData(payload,12);
}
void sendByteOfData(char * payload, int len)
{
int x;
for (x=0;x<4;x++)
// This function sends IEEE 802.15.4 frames, and I know it
// works because they are detected in the [sniffer][3].
send_IEEE_802_15_4_frame(payload,len);
}
payload[2] = payload[2] % 256 + 1;
payload[9] = payload[9] % 256 + 1;
if (payload[9] % 256 == 0 )
payload[9] = 0x01;
else
payload[9] %= 256;
}
To my surprise the above code actually sent one byte from the embedded platform to the XBee successfully. 令我惊讶的是,以上代码实际上从嵌入式平台成功地向XBee发送了一个字节。 however, the infinite loop at the end of main() should have produced a stream of bytes.
但是,main()末尾的无限循环应该已经产生了字节流。
My suspicion is I need to set payload[2]
and payload[9]
correctly, and there is probably a flaw in the incremental modulo 256 algorithm shown above. 我的怀疑是我需要正确设置
payload[2]
和payload[9]
,并且上面显示的增量模256算法可能存在缺陷。
How do I get a continuous stream of bytes? 如何获得连续的字节流?
A few thoughts... 一些想法...
unsigned char
or, even better, uint8_t
. unsigned char
数组,或者甚至更好的是uint8_t
数组。 To update payload[2] and payload[9], simplify your code: 要更新有效负载[2]和有效负载[9],请简化您的代码:
++payload[2]; ++payload[9]; if (payload[9] == 0) payload[9] = 1;
Add a delay between sends. 在发送之间添加延迟。 You might even need to wait for a response before sending the next character.
您甚至可能需要等待响应才能发送下一个字符。
Since it's a payload of unsigned 8-bit values, they'll automatically roll from 255 to 0. I assume your special case code for payload[9] is trying to roll from 255 to 1 (instead of 0). 由于它是无符号8位值的有效负载,因此它们会自动从255滚动到0。我假设您的有效负载[9]的特殊情况代码正在尝试从255滚动到1(而不是0)。
Make sure your payload doesn't need to include a checksum of some sort. 确保您的有效载荷不需要包含某种校验和。 Updating those two bytes would have an affect on a checksum byte.
更新这两个字节将对校验和字节产生影响。
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