如何在CC254x上获取BLE 37个通信信道的RSSI？

如何在CC254x上获取BLE 37个通信信道的RSSI？

BLE是有3个广告信道、37个通信信道么？CC254x

使用协议栈可能实现么？

如果不能获取分离的，不使用协议栈，CC254x相关的寄存器是啥？

Liber Liu：

能否给点参考代码？

某文档里面：

25.5 Frequency and Channel ProgrammingFor normal transmit and receive tasks, the carrier frequency is set by using the PRF_CHAN.FREQ register.The carrier frequency is 2379 + n MHz, where n is the value of this register, and n can be from 0 to 116.This gives a frequency range from 2379 MHz to 2495 MHz. Note that this frequency range extendsbeyond the ISM band.If PRF_CHAN.FREQ is set to 127, and for the RX and TX test commands, the frequency must beprogrammed directly in hardware registers. In this case, the synthesizer frequency is set by programmingthe 7-bit frequency word located in FREQCTRL.FREQ[6:0]. The synthesizer frequency is given by2379 + n MHz, where n is the value of FREQCTRL.FREQ[6:0], and is programmable in 1-MHz steps.The device supports synthesizer frequencies in the range from 2379 MHz to 2495 MHz. The usablesettings for FREQ[6:0] is consequently 0 to 116.In RX, the system operates on a low intermediate frequency (IF) of 1 MHz for data rates up to 1 Mbps,and on a zero IF for 2 Mbps. In TX, the system supports operating on low IF or zero IF. The IF to be usedfor TX can be programmed in the register MDMTEST1.TX_TONE. The receiver may operate on a positiveor negative IF when the data rate is 1 Mbps and lower; this is controlled with MDMTEST1.RX_IF.When the symbol rate is 1 Mbps or lower and the LLE programs the frequency, it uses a ±1 MHz IF onTX. For both RX and TX, a negative IF is used when PRF_CHAN.FREQ < 62, and a positive IF is usedwhen PRF_CHAN.FREQ ≥ 62When the symbol rate is 2 Mbps and the LLE programs the frequency, it uses an IF on TX as specified inPRF_RADIO_CONF.TXIF. This IF may be zero, or ±1 MHz, ±2 MHz, or ±3 MHz. The recommendedsetting is ±1 MHz. A negative IF is used when PRF_CHAN.FREQ < 62, and a positive IF is used whenPRF_CHAN.FREQ ≥ 62.For all data rates, the setting of MDMCTRL1.PHASE_INVERT is taken into account by the LLE when findingthe setting for MDMTEST1.TX_TONE. The FREQCTRL register is programmed corresponding to theprogrammed IF in order to operate on the channel specified by PRF_CHAN.FREQ.

Yan：

liber,

广播和通信的时候，都是能获得RSSI 的值的。

广播的时候，主设备在搜索到从设备的时候，返回的设备信息里面就带着实时的RSSI 值。

连接通信的时候，通过 HCI_ReadRssiCmd（）就能实现。

Liber Liu：

回复 Yan:

您好。

BLE协议里面说BLE有30多个信道，每个信道的RSSI的值会存在一定的差别。

请问这个独立信道的rssi如何获取?

谢谢