Grove-Lora Radio的使用詳見：http://wiki.seeedstudio.com/cn/Grove_LoRa_Radio/

但是網(wǎng)站中提供的Grove_LoRa_433MHz_and_915MHz_RF-master中的示例代碼只能修改RF的頻率，不能修改LoRa擴頻因子、帶寬等參數(shù)。研究了一下午，終于搞明白怎么修改庫函數(shù)，特在此記錄。

注意！必須找到與Grove_LoRa_433MHz_and_915MHz_RF-master庫對應(yīng)的?RH_RF95.h和?RH_RF95.cpp文件！

1. 修改擴頻因子，添加如下代碼段

①?RH_RF95.cpp，添加

template <typename T> void RH_RF95<T>::setSpreadingFactor(int8_t sf) {if (sf < 6) {sf = 6;} else if (sf > 12) {sf = 12;}if (sf == 6) {this->write(RH_RF95_REG_31_DETECTION_OPTIMIZE, 0xc5);this->write(RH_RF95_REG_37_DETECTION_THRESHOLD, 0x0c);} else {this->write(RH_RF95_REG_31_DETECTION_OPTIMIZE, 0xc3);this->write(RH_RF95_REG_37_DETECTION_THRESHOLD, 0x0a);}this->write(RH_RF95_REG_1E_MODEM_CONFIG2, (this->read(RH_RF95_REG_1E_MODEM_CONFIG2) & 0x0f) | ((sf << 4) & 0xf0)); }

②?RH_RF95.h，添加

#define RH_RF95_REG_31_DETECTION_OPTIMIZE 0x31 #define RH_RF95_REG_37_DETECTION_THRESHOLD 0x37 void setSpreadingFactor(int8_t sf);

2. 修改帶寬

①?RH_RF95.cpp，添加

template <typename T> void RH_RF95<T>::setSignalBandwidth(long sbw) {int bw;if (sbw <= 7.8E3) {bw = 0;} else if (sbw <= 10.4E3) {bw = 1;} else if (sbw <= 15.6E3) {bw = 2;} else if (sbw <= 20.8E3) {bw = 3;} else if (sbw <= 31.25E3) {bw = 4;} else if (sbw <= 41.7E3) {bw = 5;} else if (sbw <= 62.5E3) {bw = 6;} else if (sbw <= 125E3) {bw = 7;} else if (sbw <= 250E3) {bw = 8;} else /*if (sbw <= 250E3)*/ {bw = 9;}this->write(RH_RF95_REG_1D_MODEM_CONFIG1, (this->read(RH_RF95_REG_1D_MODEM_CONFIG1) & 0x0f) | (bw << 4)); }

②?RH_RF95.h，添加

void setSignalBandwidth(long sbw);

3. 修改碼率

①?RH_RF95.cpp，添加

template <typename T> void RH_RF95<T>::setCodingRate4(int8_t denominator) {if (denominator < 5) {denominator = 5;} else if (denominator > 8) {denominator = 8;}int cr = denominator - 4;this->write(RH_RF95_REG_1D_MODEM_CONFIG1, (this->read(RH_RF95_REG_1D_MODEM_CONFIG1) & 0xf1) | (cr << 1)); }

②?RH_RF95.h，添加

void setCodingRate4(int8_t denominator);

?

總結(jié)

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