CC1101: RSSI LQI讀取為定值，但是CC1101可以正常通訊

WEITING KUO

Part Number: CC1101

讀取暫存器資料RSSI 與LQI一直為定值，只有在特定無法收訊的時候會產生值得變化

讀取方式有使用過直接讀取對應暫存器 0x33 [0xF3] 0x34[0xF4]
也有採取開啟暫存器設定 0x07：PKTCTRL1為0x05後讀取與BUFFER後的兩位

讀取暫存器資料RSSI 與LQI一直為定值，沒辦法獲得RSSI 與LQI 的數值從而沒辦法知道天線的好壞

我是否需要在特定的時間點讀取RSSI和LQI的值，例如在接收到一個包之後？
我是否需要配置任何特定的寄存器或設置才能正確讀取RSSI和LQI？
我的硬體和天線配置是否可能影響RSSI和LQI的讀取？
是否有任何特定的信號條件或環境因素可能影響RSSI和LQI的讀取？
下列是我的設定

typedef struct

{

uint8_t iocfg0; // GDO0 Output Pin Configuration

uint8_t fifothr; // RX FIFO and TX FIFO Thresholds

uint8_t sync1; // Sync Word, High Byte

uint8_t sync0; // Sync Word, Low Byte

uint8_t pktlen; // Packet Length

uint8_t pktctrl0; // Packet Automation Control

uint8_t fsctrl1; // Frequency Synthesizer Control

uint8_t freq2; // Frequency Control Word, High Byte

uint8_t freq1; // Frequency Control Word, Middle Byte

uint8_t freq0; // Frequency Control Word, Low Byte

uint8_t mdmcfg4; // Modem Configuration

uint8_t mdmcfg3; // Modem Configuration

uint8_t mdmcfg2; // Modem Configuration

uint8_t mdmcfg1; // Modem Configuration

uint8_t deviatn; // Modem Deviation Setting

uint8_t mcsm0; // Main Radio Control State Machine Configuration

uint8_t foccfg; // Frequency Offset Compensation Configuration

uint8_t agcctrl2; // AGC Control

uint8_t agcctrl1; // AGC Control

uint8_t worctrl; // Wake On Radio Control

uint8_t fscal3; // Frequency Synthesizer Calibration

uint8_t fscal2; // Frequency Synthesizer Calibration

uint8_t fscal1; // Frequency Synthesizer Calibration

uint8_t fscal0; // Frequency Synthesizer Calibration

uint8_t test2; // Various Test Settings

uint8_t test1; // Various Test Settings

uint8_t test0; // Various Test Settings

} RF_SETTINGS;

static RF_SETTINGS E07x_InitSetting = {

0x06, // IOCFG0 GDO0 Output Pin Configuration

0x47, // FIFOTHR RX FIFO and TX FIFO Thresholds

0x7A, // SYNC1 Sync Word, High Byte

0x0E, // SYNC0 Sync Word, Low Byte

0x14, // PKTLEN Packet Length

0x05, // PKTCTRL0 Packet Automation Control

0x06, // FSCTRL1 Frequency Synthesizer Control

0x10, // FREQ2 Frequency Control Word, High Byte

0xB1, // FREQ1 Frequency Control Word, Middle Byte

0x3B, // FREQ0 Frequency Control Word, Low Byte

0xF5, // MDMCFG4 Modem Configuration

0x83, // MDMCFG3 Modem Configuration

0x13, // MDMCFG2 Modem Configuration

0x02, // MDMCFG1 Modem Configuration

0x31, // DEVIATN Modem Deviation Setting

0x18, // MCSM0 Main Radio Control State Machine Configuration

0x16, // FOCCFG Frequency Offset Compensation Configuration

0x43, // AGCCTRL2 AGC Control

0x49, // AGCCTRL1 AGC Control

0xFB, // WORCTRL Wake On Radio Control

0xE9, // FSCAL3 Frequency Synthesizer Calibration

0x2A, // FSCAL2 Frequency Synthesizer Calibration

0x00, // FSCAL1 Frequency Synthesizer Calibration

0x1F, // FSCAL0 Frequency Synthesizer Calibration

0x81, // TEST2 Various Test Settings

0x35, // TEST1 Various Test Settings

0x09, // TEST0 Various Test Settings

};

static uint8_t E07x_Config(uint32_t frequency, uint32_t data_rate, uint32_t frequency_dev, uint32_t bandwidth,

int8_t output_power, uint16_t preamble_size, uint16_t sync_word, uint8_t crc)

{

uint8_t result;

uint8_t reg_value;

/* 計算:載波頻率

* 寄存器起始位址 0x0D */

result = E07x_SetFrequency(frequency);

if (result != 0)

return 1;

/* 計算:空速

* MDMCFG4 MDMCFG3寄存器位址:0x10 0x11 */

E07x_SetDataRate(data_rate);

/* 計算:頻偏

* DEVIATN寄存器位址:0x15 */

E07x_SetFrequencyDeviation(frequency_dev);

/* 計算:接收頻寬

* MDMCFG4寄存器位址:0x10 */

E07x_SetChannelBandwidth(bandwidth);

/* 計算:輸出功率

* 寄存器位址:0x3E */

E07x_SetOutputPower(output_power);

/* 調製模式

* MDMCFG2 寄存器位址:0x12 */

E07x_SetModulation(1); // GFSK

/* 前導碼長度

* MDMCFG1 寄存器位址:0x13 */

if (preamble_size > 7)

return 1; // 參數檢查

E07x_InitSetting.mdmcfg1 &= 0x8F; // 清零

E07x_InitSetting.mdmcfg1 |= (preamble_size << 4); // 置位

/* 同步字

* SYNC1 SYNC0 寄存器位址:0x04 0x05 */

E07x_InitSetting.sync1 = (uint8_t)((sync_word >> 8) & 0xFF); // 高Byte

E07x_InitSetting.sync0 = (uint8_t)(sync_word & 0xFF); // 低Byte

/* CRC開關

* PKTCTRL0寄存器位址:0x08 bit2 */

if (crc > 1)

return 1; // 參數檢查只能為0或1

if (crc)

{

E07x_InitSetting.pktctrl0 |= 0x04; // 開啟

}

else

{

E07x_InitSetting.pktctrl0 &= 0xFB;

}

/* 資料包長度預設為可變長模式且長度放在資料第一位元組

* PKTCTRL0寄存器位址:0x08 bit[1:0] */

E07x_InitSetting.pktctrl0 &= 0xFC; // 清零

E07x_InitSetting.pktctrl0 |= 0x01; // 0x01模式 (可變長)

/* 注意事項:如果希望完全使用官方SmartRF Studio的配置參數，那麼直接注釋掉上方的修改函數即可 */

/* 向模組寫入計算後的 E07x_InitSetting 參數表 */

E07x_SetRegister(0x02, E07x_InitSetting.iocfg0);

E07x_SetRegister(0x03, E07x_InitSetting.fifothr);

E07x_SetRegister(0x04, E07x_InitSetting.sync1);

E07x_SetRegister(0x05, E07x_InitSetting.sync0);

E07x_SetRegister(0x07, 0x05);

E07x_SetRegister(0x08, E07x_InitSetting.pktctrl0);

E07x_SetRegister(0x0B, E07x_InitSetting.fsctrl1);

E07x_SetRegister(0x0D, E07x_InitSetting.freq2);

E07x_SetRegister(0x0E, E07x_InitSetting.freq1);

E07x_SetRegister(0x0F, E07x_InitSetting.freq0);

E07x_SetRegister(0x10, E07x_InitSetting.mdmcfg4);

E07x_SetRegister(0x11, E07x_InitSetting.mdmcfg3);

E07x_SetRegister(0x12, E07x_InitSetting.mdmcfg2);

E07x_SetRegister(0x13, E07x_InitSetting.mdmcfg1);

E07x_SetRegister(0x15, E07x_InitSetting.deviatn);

E07x_SetRegister(0x18, E07x_InitSetting.mcsm0);

E07x_SetRegister(0x19, E07x_InitSetting.foccfg);

E07x_SetRegister(0x1B, E07x_InitSetting.agcctrl2);

E07x_SetRegister(0x1C, E07x_InitSetting.agcctrl1);

E07x_SetRegister(0x20, E07x_InitSetting.worctrl);

E07x_SetRegister(0x23, E07x_InitSetting.fscal3);

E07x_SetRegister(0x24, E07x_InitSetting.fscal2);

E07x_SetRegister(0x25, E07x_InitSetting.fscal1);

E07x_SetRegister(0x26, E07x_InitSetting.fscal0);

E07x_SetRegister(0x2C, E07x_InitSetting.test2);

E07x_SetRegister(0x2D, E07x_InitSetting.test1);

// E07x_SetRegister( 0x2E, E07x_InitSetting.test0); //發現: 設置TEST0導致自訂計算頻率偏移

// 現象: 當頻點設置為小於411MHz時，頻點鎖死在了411MHz。當頻點設置為大於411MHz時，頻點切換正常

// 建議: 當完全啟用官方SmartRF Studio參數時，解除TEST0的注釋。當使用自由參數計算時，保持注釋

/* 補充：通道編碼(可用於跳頻) 寄存器位址: 0x0A */

E07x_SetRegister(0x0A, 0);

/* 補充：關閉位址過濾寄存器位址: 0x07 */

reg_value = E07x_GetRegister(0x07);

reg_value &= 0xFC; // 清零

E07x_SetRegister(0x07, reg_value);

/* 補充: 配置輸出功率寄存器位址: 0x3E */

E07x_SetRegisters(0x3E, E07x_PaTabel, 8);

return 0;

}

#define E07_FREQUENCY_START 433000000 // 433 MHz

#define E07_DATA_RATE 1200

#define E07_FREQUENCY_DEVIATION 14300

#define E07_BANDWIDTH 58000

#define E07_OUTPUT_POWER 10

#define E07_PREAMBLE_SIZE 4

#define E07_SYNC_WORD 0x2DD4

#define E07_IS_CRC 1

result = E07x_Config(E07_FREQUENCY_START,

E07_DATA_RATE,

E07_FREQUENCY_DEVIATION,

E07_BANDWIDTH,

E07_OUTPUT_POWER,

E07_PREAMBLE_SIZE,

E07_SYNC_WORD,

E07_IS_CRC);

1 年多前

0 Cherry Zhou 1 年多前

TI__Guru* 81380 points

您好，您的问题我们需要升级到英文论坛寻求帮助，有答复尽快给到您。

0 Cherry Zhou 1 年多前回复 Cherry Zhou

TI__Guru* 81380 points

您好，请看如下答复：

不确定是否已完全理解上述代码以及您实际上是如何读取 RSSI 的。作为首次测试，您应执行以下操作：

void main(void) {

    // initialize MCU and peripherals
    initMCU();

    // Write radio registers
    registerConfig();

    trxSpiCmdStrobe(CC1101_SRX);
    
    do{
      cc1101SpiReadReg(CC1101_MARCSTATE,&marcstate,1);
    } while ((marcstate & 0x1F) != 0x0D);
            
    while(1)
    {
      cc1101SpiReadReg(CC1101_RSSI,&rssi,1);
      // cc1101SpiReadReg(CC1101_LQI,&lqi,1); // No point in reading LQI here as no packets are received
    }
}

对于寄存器设置，请使用 SmartRF Studio 给出的一些默认设置，例如：

// Address Config = No address check 
// Base Frequency = 432.999817 
// CRC Autoflush = false 
// CRC Enable = true 
// Carrier Frequency = 432.999817 
// Channel Number = 0 
// Channel Spacing = 199.951172 
// Data Format = Normal mode 
// Data Rate = 38.3835 
// Deviation = 20.629883 
// Device Address = 0 
// Manchester Enable = false 
// Modulated = true 
// Modulation Format = GFSK 
// PA Ramping = false 
// Packet Length = 255 
// Packet Length Mode = Variable packet length mode. Packet length configured by the first byte after sync word 
// Preamble Count = 4 
// RX Filter BW = 101.562500 
// Sync Word Qualifier Mode = 30/32 sync word bits detected 
// TX Power = 0 
// Whitening = false 
// PA table 
#define PA_TABLE {0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00}

static const registerSetting_t preferredSettings[]= 
{
  {CC1101_IOCFG0,      0x06},
  {CC1101_FIFOTHR,     0x47},
  {CC1101_PKTCTRL0,    0x05},
  {CC1101_FSCTRL1,     0x06},
  {CC1101_FREQ2,       0x10},
  {CC1101_FREQ1,       0xA7},
  {CC1101_FREQ0,       0x62},
  {CC1101_MDMCFG4,     0xCA},
  {CC1101_MDMCFG3,     0x83},
  {CC1101_MDMCFG2,     0x13},
  {CC1101_DEVIATN,     0x35},
  {CC1101_MCSM0,       0x18},
  {CC1101_FOCCFG,      0x16},
  {CC1101_AGCCTRL2,    0x43},
  {CC1101_WORCTRL,     0xFB},
  {CC1101_FSCAL3,      0xE9},
  {CC1101_FSCAL2,      0x2A},
  {CC1101_FSCAL1,      0x00},
  {CC1101_FSCAL0,      0x1F},
  {CC1101_TEST2,       0x81},
  {CC1101_TEST1,       0x35},
  {CC1101_TEST0,       0x09},
};

当运行上面的代码时，您会看到 RSSI 正在读数之间变化。

在这种情况下，LQI 将为0x00，因为该寄存器仅在发现同步字后更新。对于该初始测试，我们并不会发送任何内容，只是读取本底噪声的 RSSI。

低于 1GHz

低于 1GHz 论坛

CC1101: RSSI LQI讀取為定值，但是CC1101可以正常通訊