Am 05.08.2018 um 02:11 schrieb Andreas Färber: > Am 03.07.2018 um 17:11 schrieb Jian-Hong Pan: >> 2018-07-01 19:07 GMT+08:00 Andreas Färber <afaerber@xxxxxxx>: >>> 5) Many of the modules support multiple modes, such as LoRa, LoRaWAN and FSK. >>> Lacking a LoRaWAN implementation, I am currently switching them into LoRa >>> mode at probe time wherever possible. How do we deal with that properly? [...] > Independently of what LoRaWAN does, the > user needs to be able to send on the physical layer from a selection of > LoRa, GFSK, FSK, OOK, GMSK and MSK. > Supposedly Wireless M-Bus and IEEE 802.15.4 can be implemented via those > according to the SX1276 datasheet. > > This opens a can of worms... > > SX127x has a single channel, so I don't think there should be six > network interfaces lora0, gfsk0, fsk0, ook0, gmsk0 and msk0 exposed to > the user. > Having a lora0 interface speak non-LoRa modulations may be confusing, > but since the chip is sold as LoRa transceiver it might be acceptable. > > SX130x has 8+2 channels, with IF9 dedicated to GFSK/FSK. It appears to > use one FIFO for receiving (up to 16 packets) and can only transmit one > packet at a time. So I think this should be one lora0 interface, too. > > With a view to supporting non-LoRa RF chipsets such as Si4xxx (GFSK, > FSK, OOK) or nRF905 and nRF24L01+ (both GFSK) at a later date, I don't > think those modulations should be some netlink option on a PF_LORA > interface but cleanly distinguished as ETH_P_GFSK or something. > For example, the Chistera Pi HAT has both an RFM95W and an RFM22 module. Answering myself here: MSK is a special case of FSK, and GMSK a special case of GFSK. SX1276 allows to switch between LoRa and FSK/OOK modes, and in FSK/OOK mode between FSK and OOK modulation types and for FSK modulation allows to set Gaussian filter values. I assume (G)MSK is selected indirectly through BitRate and Fdev settings or something. So we would just need ETH_P_FSK and ETH_P_OOK plus some skb fields for ETH_P_FSK. Regards, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
