在arduino中将字符串传递给uint8_t数组
Passing string to uint8_t array in arduino
我必须通过 Arduino 的 XBee(在 API 模式下)发送一个整数计数器作为 'num'。为此,我必须将此整数转换为字符串,然后转换为 uint8_t 数组,因为它在 API 帧中需要传输。
除了其他细节外,我已将我的整数转换为字符串,如
String str;
int num = 0;
char cstr[16];
void loop() {
num++;
str = String(num);
str.toCharArray(cstr,16);
Serial.println(cstr); // this shows the correct result, means int is converted to String correctly
uint8_t data[] = {cstr}; // passing String to uint8_t array
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, sizeof(data));
xbee.send(zbTx);
int count = sizeof(data);
for (int i = 0; i < count; i++) {
if (i == (count-1)) {
Serial.print(data[i]); // here it prints "104" of ASCII which is equal to "h"
}
}
}
它也像串行打印一样传输它,即('104')。
请指出我是否犯了任何错误,如果我没有按要求做,请指导我。
首先去掉那些cstr和String:
int num = 0;
//char cstr[16];
char data[16] = {'[=10=]'}; // Initialize data array
void setup() {
}
void loop() {
num++;
//str = String(num);
//str.toCharArray(cstr,16);
itoa (num, data, 10);
Serial.println(data);
// To get the number of elements in the array use
uint8_t datalen = strlen(data);
// Black box see lib for details
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, datalen);
xbee.send(zbTx);
// Print test
Serial.println("Content of data: ");
Serial.print(data);
Serial.print(" datalen: ");
Serial.print(datalen);
}
这应该会如您所愿。
要复制一个数组,您可以使用 strcpy(或带有 malloc 和 free 的 memcopy),使用 strlen 获取元素的数量。
编辑:
这是经过测试的代码(只需复制并粘贴并首先仅替换包含到您的 xbee 库中的代码:
#include "Xbee.h" //-> Change to your xbee lib
uint16_t num = 0;
char xdata[16] = {'[=11=]'};// Initialize data array
char numbuf[16] = {'[=11=]'}; // initialize number buffer
long currentMillis = 0;
void setup() {
Serial.begin(115200);
currentMillis = millis();
}
void loop() {
if (millis() - currentMillis > 1000) { // 1 sec timer to prevent overflow due to hammering xbee with data -> tune to your stable transmission
num++;
itoa (num, numbuf, 10); // Num buffer
strcpy(xdata, numbuf); // Copy content of num buffer to data array
Serial.println(xdata);
// To get the number of elements in the array use
uint16_t datalen = strlen(xdata);
// Black box see lib for details
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, datalen);
xbee.send(zbTx);
// Print test
Serial.print("Content of xdata: ");
Serial.print(xdata);
Serial.print(" datalen: ");
Serial.println(datalen);
currentMillis = millis(); // reset timer
}
}
串行监视器的结果是:
1
Content of xdata: 1 datalen: 1
2
Content of xdata: 2 datalen: 1
3
Content of xdata: 3 datalen: 1
4
Content of xdata: 4 datalen: 1
....
864
Content of xdata: 864 datalen: 3
865
Content of xdata: 865 datalen: 3
866
Content of xdata: 866 datalen: 3
所以一切都按预期工作,没有 104 或类似的。请先复制粘贴 - 测试它 - 然后你添加
我必须通过 Arduino 的 XBee(在 API 模式下)发送一个整数计数器作为 'num'。为此,我必须将此整数转换为字符串,然后转换为 uint8_t 数组,因为它在 API 帧中需要传输。
除了其他细节外,我已将我的整数转换为字符串,如
String str;
int num = 0;
char cstr[16];
void loop() {
num++;
str = String(num);
str.toCharArray(cstr,16);
Serial.println(cstr); // this shows the correct result, means int is converted to String correctly
uint8_t data[] = {cstr}; // passing String to uint8_t array
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, sizeof(data));
xbee.send(zbTx);
int count = sizeof(data);
for (int i = 0; i < count; i++) {
if (i == (count-1)) {
Serial.print(data[i]); // here it prints "104" of ASCII which is equal to "h"
}
}
}
它也像串行打印一样传输它,即('104')。 请指出我是否犯了任何错误,如果我没有按要求做,请指导我。
首先去掉那些cstr和String:
int num = 0;
//char cstr[16];
char data[16] = {'[=10=]'}; // Initialize data array
void setup() {
}
void loop() {
num++;
//str = String(num);
//str.toCharArray(cstr,16);
itoa (num, data, 10);
Serial.println(data);
// To get the number of elements in the array use
uint8_t datalen = strlen(data);
// Black box see lib for details
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, datalen);
xbee.send(zbTx);
// Print test
Serial.println("Content of data: ");
Serial.print(data);
Serial.print(" datalen: ");
Serial.print(datalen);
}
这应该会如您所愿。
要复制一个数组,您可以使用 strcpy(或带有 malloc 和 free 的 memcopy),使用 strlen 获取元素的数量。
编辑: 这是经过测试的代码(只需复制并粘贴并首先仅替换包含到您的 xbee 库中的代码:
#include "Xbee.h" //-> Change to your xbee lib
uint16_t num = 0;
char xdata[16] = {'[=11=]'};// Initialize data array
char numbuf[16] = {'[=11=]'}; // initialize number buffer
long currentMillis = 0;
void setup() {
Serial.begin(115200);
currentMillis = millis();
}
void loop() {
if (millis() - currentMillis > 1000) { // 1 sec timer to prevent overflow due to hammering xbee with data -> tune to your stable transmission
num++;
itoa (num, numbuf, 10); // Num buffer
strcpy(xdata, numbuf); // Copy content of num buffer to data array
Serial.println(xdata);
// To get the number of elements in the array use
uint16_t datalen = strlen(xdata);
// Black box see lib for details
XBeeAddress64 addr64 = XBeeAddress64();
addr64.setMsb(0x00000000);
addr64.setLsb(0x00000000);
ZBTxRequest zbTx = ZBTxRequest(addr64, data, datalen);
xbee.send(zbTx);
// Print test
Serial.print("Content of xdata: ");
Serial.print(xdata);
Serial.print(" datalen: ");
Serial.println(datalen);
currentMillis = millis(); // reset timer
}
}
串行监视器的结果是:
1
Content of xdata: 1 datalen: 1
2
Content of xdata: 2 datalen: 1
3
Content of xdata: 3 datalen: 1
4
Content of xdata: 4 datalen: 1
....
864
Content of xdata: 864 datalen: 3
865
Content of xdata: 865 datalen: 3
866
Content of xdata: 866 datalen: 3
所以一切都按预期工作,没有 104 或类似的。请先复制粘贴 - 测试它 - 然后你添加