【安信可BW16-Kit开发板】ble uart 发送测温数据
<div class='showpostmsg'><p><strong>一、板卡连接</strong></p><p><strong> </strong>使用的温度传感器是 D6T-44L-06H，板卡通过I2C总线读取传感器信息，再通过蓝牙传输数据</p>
<p> </p>
<p><strong>二、代码烧录</strong></p>
<pre>
<code class="language-cpp">* includes */
#include <Wire.h>
#include "BLEDevice.h"
#define UART_SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
#define STRING_BUF_SIZE 100
/* defines */
#define D6T_ADDR 0x0A// for I2C 7bit address
#define D6T_CMD 0x4C// for D6T-44L-06/06H, D6T-8L-09/09H, for D6T-1A-01/02
#define N_ROW 4
#define N_PIXEL (4 * 4)
#define N_READ ((N_PIXEL + 1) * 2 + 1)
BLEService UartService(UART_SERVICE_UUID);
BLECharacteristic Rx(CHARACTERISTIC_UUID_RX);
BLECharacteristic Tx(CHARACTERISTIC_UUID_TX);
BLEAdvertData advdata;
BLEAdvertData scndata;
bool notify = false;
void writeCB (BLECharacteristic* chr, uint8_t connID) {
//printf("Characteristic %s write by connection %d :\n", chr->getUUID().str(), connID);
Serial.print("Characteristic ");
Serial.print(chr->getUUID().str());
Serial.print(" write by connection ");
Serial.println(connID);
if (chr->getDataLen() > 0) {
Serial.print("Received string: ");
Serial.print(chr->readString());
Serial.println();
}
}
void notifCB(BLECharacteristic* chr, uint8_t connID, uint16_t cccd) {
if (cccd & GATT_CLIENT_CHAR_CONFIG_NOTIFY) {
//printf("Notifications enabled on Characteristic %s for connection %d \n", chr->getUUID().str(), connID);
Serial.print("Notifications enabled on Characteristic");
notify = true;
} else {
//printf("Notifications disabled on Characteristic %s for connection %d \n", chr->getUUID().str(), connID);
Serial.print("Notifications disabled on Characteristic");
notify = false;
}
Serial.print(chr->getUUID().str());
Serial.print(" for connection");
Serial.println(connID);
}
uint8_t rbuf;
double ptat;
double pix_data;
uint8_t calc_crc(uint8_t data) {
int index;
uint8_t temp;
for (index = 0; index < 8; index++) {
temp = data;
data <<= 1;
if (temp & 0x80) {data ^= 0x07;}
}
return data;
}
/** <!-- D6T_checkPEC {{{ 1--> D6T PEC(Packet Error Check) calculation.
* calculate the data sequence,
* from an I2C Read client address (8bit) to thermal data end.
*/
bool D6T_checkPEC(uint8_t buf[], int n) {
int i;
uint8_t crc = calc_crc((D6T_ADDR << 1) | 1);// I2C Read address (8bit)
for (i = 0; i < n; i++) {
crc = calc_crc(buf ^ crc);
}
bool ret = crc != buf;
if (ret) {
Serial.print("PEC check failed:");
Serial.print(crc, HEX);
Serial.print("(cal) vs ");
Serial.print(buf, HEX);
Serial.println("(get)");
}
return ret;
}
/** <!-- conv8us_s16_le {{{1 --> convert a 16bit data from the byte stream.
*/
int16_t conv8us_s16_le(uint8_t* buf, int n) {
uint16_t ret;
ret = (uint16_t)buf;
ret += ((uint16_t)buf) << 8;
return (int16_t)ret; // and convert negative.
}
/** <!-- setup {{{1 -->
* 1. Initialize
- initialize a Serial port for output.
- initialize I2C.
*/
void setup() {
Serial.begin(115200);// Serial baudrate = 115200bps
Wire.begin();// i2c master
advdata.addFlags();
advdata.addCompleteName("AMEBA_BLE_DEV");
scndata.addCompleteServices(BLEUUID(UART_SERVICE_UUID));
Rx.setWriteProperty(true);
Rx.setWritePermissions(GATT_PERM_WRITE);
Rx.setWriteCallback(writeCB);
Rx.setBufferLen(STRING_BUF_SIZE);
Tx.setReadProperty(true);
Tx.setReadPermissions(GATT_PERM_READ);
Tx.setNotifyProperty(true);
Tx.setCCCDCallback(notifCB);
Tx.setBufferLen(STRING_BUF_SIZE);
UartService.addCharacteristic(Rx);
UartService.addCharacteristic(Tx);
BLE.init();
BLE.configAdvert()->setAdvData(advdata);
BLE.configAdvert()->setScanRspData(scndata);
BLE.configServer(1);
BLE.addService(UartService);
BLE.beginPeripheral();
delay(620);
}
/** <!-- loop - Thermal sensor {{{1 -->
* 2. read data.
*/
void loop() {
int i = 0;
int16_t itemp = 0;
// Read data via I2C
// I2C buffer of "Arduino MKR" is 256 buffer. (It is enough)
memset(rbuf, 0, N_READ);
Wire.beginTransmission(D6T_ADDR);// I2C slave address
Wire.write(D6T_CMD); // D6T register
Wire.endTransmission();
delay(1);
Wire.requestFrom(D6T_ADDR, N_READ);
while (Wire.available()) {
rbuf = Wire.read();
}
D6T_checkPEC(rbuf, N_READ - 1);
//Convert to temperature data (degC)
ptat = (double)conv8us_s16_le(rbuf, 0) / 10.0;
for (i = 0; i < N_PIXEL; i++) {
itemp = conv8us_s16_le(rbuf, 2 + 2*i);
pix_data = (double)itemp / 10.0;
}
//Output results
double sum ;
for (i = 0; i < N_PIXEL; i++) {
sum += pix_data;
}
double average = sum / N_PIXEL;
String str = ("The average temporature: " + String(average) + "°C\n");
delay(300);
Tx.writeString(str);
if (BLE.connected(0) && notify) {
Tx.notify(0);
}
delay(5000);
}</code></pre>
<p><strong>三、实验结果</strong></p>
<p>使用手机上的 android 端蓝牙调试软件：<strong>serial bluetooth terminal</strong></p>
<p>在device里找到，开发板设置的蓝牙名称，连接</p>
<p> </p>
<p>连接后就进入到串口 terminal，传感器对着一台手机。</p>
<p>由于String buffer不是很大，我只对16个方位的温度值取平均值，做个功能展示</p>
<p> </p>
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