CC1101为什么无缘无故自动进入空闲模式？
用CC1101做一对一通讯，从机定时发送不接收，主机只接收数据；主机长期处在RX状态，在接收到数据后进入IDLE状态并进行校准。现在发现的问题是，在一个不确定的时间（有时是非常长的时间，几小时）后，主机模块会莫名其妙的进入IDLE模式而不是RX模式，这个现象好像和信号强度有关，在信号较弱时容易出现，这是怎么回事？/*****************************************************************************************///CC1100清洗RXFIFO函数/*****************************************************************************************/void CC1100_Clear_RXFIFO(void){CC1100_Strobe(CC1100_SIDLE);//进入空闲状态CC1100_Strobe(CC1100_SCAL); //进行校准Delay(CAL_tiME); //等待校正完成,等待809usCC1100_Strobe(CC1100_SFRX); //清除RXFIFOCC1100_Strobe(CC1100_SFTX); //清除TXFIFOCC1100_Strobe(CC1100_SRX); //进入接收状态//注：必须进入空闲状态才可以清洗RXFIFO，否则出错。}/*****************************************************************************************///CC1100接收数据包函数/*****************************************************************************************///描述://接收一个长度可变的数据包 (数据包的第一个字节必须是数据包长度)//数据包的长度不能超过 RXFIFO 的长度.//要使用这个函数,PKTCTRL1寄存器中的附加状态字节(APPEND_STATUS)必须被使能.//一定要在确定有数据包已经被接收到(设定相应的GDO引脚指示接收完成)以后使用此函数。//首先读取 RXBYTES 寄存器值，确定在 RXFIFO 中的数据长度.//变量:// unsigned char *rxBuffer 指向接收数据储存区// unsigned char length 预期接收数据的长度//返回值://0x80: CRC OK//0x00: CRC NOT OK (在 RXFIFO 中没有要接收的数据)unsigned char RFReceivePacket(unsigned char *rxBuffer,unsigned char length){unsigned char status[2];unsigned char rxfifo_len;unsigned char rssi_dec;//rxfifo_len = CC1100_ReadStatus(CC1100_RXBYTES) & CC1100_NUM_RXBYTES;rxfifo_len = CC1100_ReadStatus(CC1100_RXBYTES);//读出RXFIFO中数据长度包括溢出位if(rxfifo_len == (length+2)) { CC1100_ReadBurstReg(CC1100_RXFIFO, rxBuffer, length);//读取接受到的数据并保存 CC1100_ReadBurstReg(CC1100_RXFIFO, status, 2);//读取附加的2个状态字节 rssi_dec = CC1100_ReadStatus(CC1100_RSSI); if(rssi_dec >= 128) RSSI_DBM = (int)((int)( rssi_dec - 256) / 2) - RSSI_OFFSET; else RSSI_DBM = (rssi_dec / 2) - RSSI_OFFSET; CC1100_Clear_RXFIFO();//清除RXFIFO return (unsigned char)(status[CC1100_LQI_RX]&CC1100_CRC_OK); } else { CC1100_ReadBurstReg(CC1100_RXFIFO, rxBuffer, 1); CC1100_RXBUF[0] = 0; CC1100_Clear_RXFIFO();//清除RXFIFO return 0; //返回错误 }}另外，寄存器中AGC_LNA_PRIORITY位该如何设置，对无线新能有何影响？下面是我的主机设置：/*****************************************************************************************///CC1101初始化/*****************************************************************************************/// Chipcon// Product = CC1101// Chip version = A (VERSION = 0x04)// Crystal accuracy = 10 ppm// X-tal frequency = 26 MHz// RF output power = 10 dBm// RX filterbandwidth = 541.666667 kHz// Deviation = 127 kHz// Datarate = 249.938965 kBaud// Modulation = (1) GFSK// Manchester enable = (0) Manchester disabled// RF Frequency = 407.399719 MHz// Channel spacing = 199.951172 kHz// Channel number = 0// Optimization = Sensitivity// Sync mode = (3) 30/32 sync word bits detected// Format of RX/TX data = (0) Normal mode, use FIFOs for RX and TX// CRC operation = (1) CRC calculation in TX and CRC check in RX enabled// Forward Error Correction = (0) FEC disabled// Length configuration = (1) Variable length packets, packet length configured by the first received byte after sync word.// Packetlength = 255// Preamble count = (2) 4 bytes// Append status = 1// Address check = (0) No address check// FIFO autoflush = 0// Device address = 0// GDO0 signal selection = ( 6) Asserts when sync word has been sent / received, and de-asserts at the end of the packet// GDO2 signal selection = (41) CHIP_RDYunsigned char PATABLE[8] = {0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0};void WriteRFSettings(void){// Write register settingsCC1100_WriteReg(CC1100_FSCTRL1, 0x0C);//Freq synthesizer control. //FREQ_IF[4:0] = 0x0C,设置中频频率为304.6875KHZCC1100_WriteReg(CC1100_FSCTRL0, 0x00);//Freq synthesizer control. //FREQOFF[7:0] = 0,设置频率偏移为0CC1100_WriteReg(CC1100_FREQ2, 0x0F);//Freq control word,high byte.CC1100_WriteReg(CC1100_FREQ1, 0xAB);//Freq control word,mid byte.CC1100_WriteReg(CC1100_FREQ0, 0x52);//Freq control word,low byte. //FREQ[23:0] = 0x0FAB52,设置基频载波频率为407.399719238MHZCC1100_WriteReg(CC1100_MDMCFG4, 0x2D);//Modem configuration. //CHANBW_E[1:0] = 0x00,CHANBW_M[1:0] = 0x02,设置接收器信道滤波带宽为541.666667KHZ //DRATE_E[3:0] = 0x0D,CC1100_WriteReg(CC1100_MDMCFG3, 0x3B);//Modem configuration. //DRATE_M[7:0] = 0x3B,设置通讯数据速率为249.93896484375KBaudCC1100_WriteReg(CC1100_MDMCFG2, 0x17);//Modem configuration. //DEM_DCFILT_OFF = 0,使能解调器前的直流阻断滤波器,以提高接收灵敏度 //MOD_FORMAT[2:0] = 001,使用GFSK调制模式 //MANCHESTER_EN = 0,关闭曼彻斯特编码 //SYNC_MODE[2:0] = 0x07,设置30/32同步词汇位被侦测，载波必须超门限CC1100_WriteReg(CC1100_MDMCFG1, 0xA2);//Modem configuration. //FEC_EN = 1,开启交错FEC前导向纠错,只支持固定长数据包 //NUM_PREAMBLE[2:0] = 2,设置前导数据为4字节 //CHANSPC_E[1:0] = 2CC1100_WriteReg(CC1100_MDMCFG0, 0xF8);//Modem configuration. //CHANSPC_M[7:0] = 0xf8,设置信道间隔为199.951172KHzCC1100_WriteReg(CC1100_CHANNR, 0x80);//Channel number.128频道是433MHZ频率中心点CC1100_WriteReg(CC1100_DEVIATN, 0x62);//Modem dev (when FSK mod en) //DEVIATION_E[2:0] = 6,DEVIATION_M[2:0] = 2,设置FSK调制的频移键控偏移频率为126.953125KHZCC1100_WriteReg(CC1100_FREND1, 0xB6);//Front end RX configuration.接收前端设置 //LNA_CURRENT[1:0] = 0x02 //LNA2MIX_CURRENT[1:0] = 0x03 //LODIV_BUF_CURRENT_RX[1:0] = 0x01 //MIX_CURRENT[1:0] = 0x02,这些数值由SMART RF STUDIO给出,资料上没有给出说明CC1100_WriteReg(CC1100_FREND0, 0x10);//Front end RX configuration.接收前端设置 //LODIV_BUF_CURRENT_TX[1:0] = 0x01 //PA_POWER[2:0] = 0,选择使用PATABLE索引0定义的输出功率值CC1100_WriteReg(CC1100_MCSM2 , 0x07);//MainRadio Cntrl State Machine //RX_TIME_RSSI = 0 //RX_TIME_QUAL = 0 //RX_TIME[2:0] = 0x07,直到接收完数据包后结束RX状态CC1100_WriteReg(CC1100_MCSM1 , 0x00);//MainRadio Cntrl State Machine //CCA_MODE[1:0] = 0x00,关闭CCA //RXOFF_MODE[1:0] = 0x00,接收完成后进入IDLE空闲状态 //TXOFF_MODE[1:0] = 0x00,发送完成后进入IDLE空闲状态CC1100_WriteReg(CC1100_MCSM0 , 0x08);//MainRadio Cntrl State Machine //FS_AUTOCAL[1:0] = 0x00,不进行自动校准，使用手动校准 //PO_TIMEOURT = 0x02 //PIN_CTRL_EN = 0,禁止可选的引脚方式控制无线电 //XOSC_FORCE_ON = 0,在SLEEP模式下关闭XOSC，禁止强制开启CC1100_WriteReg(CC1100_FOCCFG, 0x1D);//Freq Offset Compensation Config //0x3D //FOC_BS_CS_GATE = 1, 冻结解调器频率补偿,直到载波感应有效 //FOC_PRE_K[1:0] = 0x03,检测到同步字之前的频率补偿回路增益设置为4K //FOC_POT_K = 1, 检测到同步字之后的频率补偿回路增益设置为K/2 //FOC_LIMIT[1:0] = 0x01,设置频率补偿算法饱和点为 ±BW_CHAN/8（频道带宽的1/8）CC1100_WriteReg(CC1100_BSCFG, 0x1C);//Bit synchronization config. //BS_PRE_K[1:0] = 0x00,在检测到同步字之前使用的时钟恢复反馈回路积分增益为Ki //BS_PRE_KP[1:0] = 0x01,在检测到同步字之前使用的时钟恢复反馈回路比例增益为2Kp //BS_POST_KI = 1, 在检测到同步字之后使用的时钟恢复反馈回路积分增益为Ki/2 //BS_POST_KP = 1, 在检测到同步字之后使用的时钟恢复反馈回路比例增益为Kp //BS_LIMIT[1:0] = 0x00,不进行数据传输速率偏移补偿CC1100_WriteReg(CC1100_AGCCTRL2,0x47);//AGC control. //MAX_DVGA_GAIN[1:0] = 0x01,设置DVGA数字可变增益放大器的允许最大增益为The highest gain settings can not be used //MAX_LNA_GAIN[2:0] = 0x00,设置LNA+LNA2可以使用尽可能最大的增益 //MAGN_TARGET[2:0] = 0x07,设置数字信道滤波器平均振幅为42dBCC1100_WriteReg(CC1100_AGCCTRL1,0x00);//AGC control. //AGC_LNA_PRIORITY = 0,增益自动调整先减小LNA2的增益 //CARRIER_SENSE_REL_THR[1:0] = 0x00,禁止载波感应相对变化阀值 //CARRIER_SENSE_ABS_THR[3:0] = 0x00,设置载波感应绝对阀值和MAGN_TARGET值相同,RSSI 绝对阀值在-81db左右CC1100_WriteReg(CC1100_AGCCTRL0,0xB0);//AGC control. //HYST_LEVEL[1:0] = 0x02 //WAIT_TIME[1:0] = 0x03,信道滤波器采样32次 //AGC_FREEZE[1:0] = 0x00,时钟进行自动增益调节 //FILTER_LENGHT[1:0] = 0x02,设置从通道滤波器出来的幅度的平均长度为8CC1100_WriteReg(CC1100_FSCAL3, 0xEA);//Frequency synthesizer calibration.频率校准保存寄存器3CC1100_WriteReg(CC1100_FSCAL2, 0x2A);//Frequency synthesizer calibration.频率校准保存寄存器2CC1100_WriteReg(CC1100_FSCAL1, 0x00);//Frequency synthesizer calibration.频率校准保存寄存器1CC1100_WriteReg(CC1100_FSCAL0, 0x1F);//Frequency synthesizer calibration.频率校准保存寄存器0CC1100_WriteReg(CC1100_FSTEST, 0x59);//Frequency synthesizer calibration.CC1100_WriteReg(CC1100_TEST2, 0x88);//Various test settings.CC1100_WriteReg(CC1100_TEST1, 0x31);//Various test settings.CC1100_WriteReg(CC1100_TEST0, 0x0B);//Various test settings.CC1100_WriteReg(CC1100_FIFOTHR, 0x07);// FIFOTHR RXFIFO and TXFIFO thresholds.CC1100_WriteReg(CC1100_IOCFG2, 0x07);//GDO2 output pin config.当接收到一个数据包，且CRC校验正确时，高电平；当从RX FIFO总读取第一个字节后，低电平。CC1100_WriteReg(CC1100_IOCFG0, 0x07);//GDO0 output pin config.CC1100_WriteReg(CC1100_PKTCTRL1,0x0D);//Packet automation control. //PQT[2:0] = 0x00,前导码质量评估阀值为0 //CRC_AUTOFLUSH = 1,使能CRC错误自动清空RX FIFO //APPEND_STATUS = 1,自动附加2字节状态量 //ADR_CHK[1:0] = 0x01,地址检查（无广播）CC1100_WriteReg(CC1100_PKTCTRL0,0x44);//Packet automation control. //WHITE_DATA = 1,使能数据白化 //PKT_FORMAT[1:0] = 0x00,普通模式,使用RX FIFO和TX FIFO //CRC_EN = 1,使能TX自动计算CRC，RX自动校验CRC //LENGTH_CONFIG[1:0] = 0x00,固定长数据包格式CC1100_WriteReg(CC1100_ADDR, 0x01);//Device address.本机地址CC1100_WriteReg(CC1100_PKTLEN, 0x04);//Packet length.最大允许接收数据长度为4CC1100_WriteReg(CC1100_SYNC1, 0xD3);CC1100_WriteReg(CC1100_SYNC0, 0x82);CC1100_WriteBurstReg(CC1100_PATABLE, PATABLE, 8);//Write PATABLE,设置发射功率为+10dB//CC1100_Strobe(CC1100_SIDLE);//进入空闲状态CC1100_Strobe(CC1100_SCAL); //进行校准Delay(CAL_TIME); //等待校正完成,等待809usCC1100_Strobe(CC1100_SRX); //进入接收状态}
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满足低功耗要求：极低的接受电流8mA，业内领先的20dBm输出功率
成本低：比CC1101、SI4432无线芯片有价格优势
传输距离可达到2Km@10kbps
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