- Posts: 2631
EAchine E012
13 Jun 2017 19:30 #62979
by SeByDocKy
Replied by SeByDocKy on topic EAchine E012
Hummm it's working very sporadically 
..... with a lot delay... sometimes it's loosing the bind
..... with a lot delay... sometimes it's loosing the bind Please Log in or Create an account to join the conversation.
14 Jun 2017 10:33 #62988
by goebish
Replied by goebish on topic EAchine E012
I had a look at the signals, perhaps that explains the issue.
During bind, expected center frequency is 2460 MHz.
With the nrf24l01, there's a +33 kHz drift:
While with the hs6200 there's a -44 kHz drift (also, the signal is pretty dirty
):
Those drifts in opposite direction (77 kHz) could explain the problem, maybe a RF expert can confirm that ?
During bind, expected center frequency is 2460 MHz.
With the nrf24l01, there's a +33 kHz drift:
While with the hs6200 there's a -44 kHz drift (also, the signal is pretty dirty
):
Those drifts in opposite direction (77 kHz) could explain the problem, maybe a RF expert can confirm that ?
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14 Jun 2017 11:09 #62990
by goebish
Replied by goebish on topic EAchine E012
What do you mean ?
The only way to fine-tune the drift on the nrf24l01 would be to replace the load capacitors that are around its crystal, but that's not a proper solution, except if the only model you want to control with the nrf24 is the E012
I'll also trim the antenna on the Rx, I noticed it's almost 40mm long ...
The only way to fine-tune the drift on the nrf24l01 would be to replace the load capacitors that are around its crystal, but that's not a proper solution, except if the only model you want to control with the nrf24 is the E012
I'll also trim the antenna on the Rx, I noticed it's almost 40mm long ...
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15 Jun 2017 16:19 #63005
by SeByDocKy
Replied by SeByDocKy on topic EAchine E012
For me ... whatever the power, ID, and Fc the behaviour is close to be random
the behaviour is close to be random Please Log in or Create an account to join the conversation.
15 Jun 2017 16:50 - 16 Jun 2017 13:48 #63007
by goebish
Replied by goebish on topic EAchine E012
Ah, looks like the cyrf6936 could be a good candidate:
In GFSK mode, data is transmitted at 1 Mbps, without any DSSS: cool, that's exactly what we need, no DSSS and no Pseudo Noise !
Registers 0x1b & 0x1c: TX_OFFSET
Synthesizer offset value. This is a 12 bit 2’s complement signed number, which may be used to offset the transmit frequency of the device by up to ±1.5 MHz. A positive value increases the transmit frequency, and a negative value reduces the transmit frequency. A value of +1 increases the transmit frequency by 732.6 Hz; a value of –1 decreases the transmit frequency by 732.6 Hz
I've never worked with the cyrf6936 yet, that's a good opportunity, but it might take some time
If only the nrf24l01 had this feature as well ...
In GFSK mode, data is transmitted at 1 Mbps, without any DSSS: cool, that's exactly what we need, no DSSS and no Pseudo Noise !
Registers 0x1b & 0x1c: TX_OFFSET
Synthesizer offset value. This is a 12 bit 2’s complement signed number, which may be used to offset the transmit frequency of the device by up to ±1.5 MHz. A positive value increases the transmit frequency, and a negative value reduces the transmit frequency. A value of +1 increases the transmit frequency by 732.6 Hz; a value of –1 decreases the transmit frequency by 732.6 Hz
I've never worked with the cyrf6936 yet, that's a good opportunity, but it might take some time
If only the nrf24l01 had this feature as well ...
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16 Jun 2017 04:16 #63018
by SeByDocKy
Replied by SeByDocKy on topic EAchine E012
Whaooohhhh can be a super workaround 
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16 Jun 2017 12:06 - 16 Jun 2017 15:28 #63021
by goebish
Replied by goebish on topic EAchine E012
Hack in progress, I still can't promise I'll be able to make it work, I've to circumvent some issues, but first results seem promising
cyrf in gfsk mode, SOP & CRC disabled, transmitting 0x55aa preamble (customable) + 00 ff 00 ff 00 ... 16 byte payload
... now I've to be able to send a payload longer than 16 bytes (27 bytes are needed in total for the E012 protocol, including HS6200 preamble), with the cyrf that's possible to send a payload up to 255 bytes (or 40, that's not clear ...) but it has to be done in 16 byte bursts, the fifo has to be refilled while the radio is transmitting ... Fortunately interrupts are triggered to find out when half or all bytes-1 of the fifo have been sent. I've to experiment and get the timing right.
cyrf in gfsk mode, SOP & CRC disabled, transmitting 0x55aa preamble (customable) + 00 ff 00 ff 00 ... 16 byte payload
... now I've to be able to send a payload longer than 16 bytes (27 bytes are needed in total for the E012 protocol, including HS6200 preamble), with the cyrf that's possible to send a payload up to 255 bytes (or 40, that's not clear ...) but it has to be done in 16 byte bursts, the fifo has to be refilled while the radio is transmitting ... Fortunately interrupts are triggered to find out when half or all bytes-1 of the fifo have been sent. I've to experiment and get the timing right.
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16 Jun 2017 19:48 - 17 Jun 2017 15:17 #63026
by goebish
Replied by goebish on topic EAchine E012
I think I've hit a wall
I'm somewhat able to receive packets sent by the cyrf with a nrf24l01, but they're corrupt and I think I understand why, nrf24l01 (and hs6200) has ±160 kHz gfsk deviation while the cyrf has ~±300 kHz... and it's not customable.
So, in the end I can't do anything better than with the nrf24l01, they're the 2 only radio we're supporting that can do gfsk @ 1 Mbps.
Oh well, at least I've learned how to use the cyrf, I did not waste my time ...
I'm somewhat able to receive packets sent by the cyrf with a nrf24l01, but they're corrupt and I think I understand why, nrf24l01 (and hs6200) has ±160 kHz gfsk deviation while the cyrf has ~±300 kHz... and it's not customable.
So, in the end I can't do anything better than with the nrf24l01, they're the 2 only radio we're supporting that can do gfsk @ 1 Mbps.
Oh well, at least I've learned how to use the cyrf, I did not waste my time ...
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20 Jun 2017 12:55 #63053
by goebish
Replied by goebish on topic EAchine E012
So:
- it kinda works with the nrf24l01
- no way to make it work with the cyrf6936
- now let's try with gnuradio / HackRF
Seems to work but there's a 1 second latency, probably because hackrf/osmocom buffer is too large. I think I've found someone that should be able to help me with that...
- it kinda works with the nrf24l01
- no way to make it work with the cyrf6936
- now let's try with gnuradio / HackRF
Seems to work but there's a 1 second latency, probably because hackrf/osmocom buffer is too large. I think I've found someone that should be able to help me with that...
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