m500 enabling RTK GPS
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Hi @Eric-Katzfey , please any thoughts on this question. Thanks.
@yu-zhang We did some experiments with RTK back in 2019 with one of these boards https://www.sparkfun.com/products/15136 and one of these Pixhawk units https://docs.px4.io/v1.9.0/en/flight_controller/pixhawk_mini.html.
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@yu-zhang We did some experiments with RTK back in 2019 with one of these boards https://www.sparkfun.com/products/15136 and one of these Pixhawk units https://docs.px4.io/v1.9.0/en/flight_controller/pixhawk_mini.html.
@Eric-Katzfey Thanks so much for double-checking! The used RTK is F9P (u-blox F9) based, so I think the Holybro one should also work for PX4 unit.
I will double-check with the team in Holybro if everything is good for the replacement then.
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Hi @Eric-Katzfey and @yu-zhang. I'm trying to use the same module you're talking about in this chat (https://www.sparkfun.com/products/15136) with VOXL2, but I haven't been able to get it to work. I would like to know if it is compatible with VOXL2 and what would be the steps to make it work. Thanks!
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Hi @Eric-Katzfey and @yu-zhang. I'm trying to use the same module you're talking about in this chat (https://www.sparkfun.com/products/15136) with VOXL2, but I haven't been able to get it to work. I would like to know if it is compatible with VOXL2 and what would be the steps to make it work. Thanks!
@xav04 We have not tried that GPS board with VOXL 2. The PX4 implementation on VOXL 2 is custom and many device drivers need modification to be able to run correctly. That is because the architecture is split between the applications processor (ARM multicore running Linux) and a DSP running an RTOS. Most device drivers run on the DSP and due the differences in the environment need customization. However, you could run the GPS driver on the applications processor instead. It's much more likely that you can use the standard PX4 GPS driver on the applications processor without customization. However, you would need to have access to a UART that is visible from the applications processor for IO. This add on board would provide that: https://www.modalai.com/collections/voxl-2-add-ons/products/usb-3-uart-expansion-adapter?variant=40740708876339. If you were to use that board, what would you be using for a compass (magnetometer)?
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@xav04 We have not tried that GPS board with VOXL 2. The PX4 implementation on VOXL 2 is custom and many device drivers need modification to be able to run correctly. That is because the architecture is split between the applications processor (ARM multicore running Linux) and a DSP running an RTOS. Most device drivers run on the DSP and due the differences in the environment need customization. However, you could run the GPS driver on the applications processor instead. It's much more likely that you can use the standard PX4 GPS driver on the applications processor without customization. However, you would need to have access to a UART that is visible from the applications processor for IO. This add on board would provide that: https://www.modalai.com/collections/voxl-2-add-ons/products/usb-3-uart-expansion-adapter?variant=40740708876339. If you were to use that board, what would you be using for a compass (magnetometer)?
@Eric-Katzfey Thanks for your reply! I'm not quite sure what compass I'm going to use, but if you know of any reliable module, I'd really appreciate it if you let me know. On the other hand, I may not be able to use that board since I'm using the 5G Modem Carrier Board which uses the same port (J3) as the VOXL 2 USB3.0 / UART Expansion Adapter. Is there any other way to connect this add on board or the gps?
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@Eric-Katzfey Thanks for your reply! I'm not quite sure what compass I'm going to use, but if you know of any reliable module, I'd really appreciate it if you let me know. On the other hand, I may not be able to use that board since I'm using the 5G Modem Carrier Board which uses the same port (J3) as the VOXL 2 USB3.0 / UART Expansion Adapter. Is there any other way to connect this add on board or the gps?
@xav04 I'll see if I can get any recommendations on compass, but usually these come integrated with the GPS. I think the best way to use the sparkfun GPS will be to try to get it going on the DSP. I'll take a look at it and see if there is an easy way to get it working.
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@xav04 I'll see if I can get any recommendations on compass, but usually these come integrated with the GPS. I think the best way to use the sparkfun GPS will be to try to get it going on the DSP. I'll take a look at it and see if there is an easy way to get it working.
@Eric-Katzfey Thank you very much! I will be waiting for your message
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Hi @yu-zhang, thank you for your reply! To give you more context, I'm using VOXL2 with the 5G Modem Carrier Board, so I'm not able to use the VOXL 2 USB3.0 / UART Expansion as @Eric-Katzfey suggested to access to that UART port. However, I found that the 5G Modem, in the J9 port has an i2c+Apps UART. Do you think I could use this port to connect the sparkfun via the standard PX4 GPS driver?
Also, do you know if the Holybro F9P comes with a PX4 compatible built-in compass?
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Hi @yu-zhang, thank you for your reply! To give you more context, I'm using VOXL2 with the 5G Modem Carrier Board, so I'm not able to use the VOXL 2 USB3.0 / UART Expansion as @Eric-Katzfey suggested to access to that UART port. However, I found that the 5G Modem, in the J9 port has an i2c+Apps UART. Do you think I could use this port to connect the sparkfun via the standard PX4 GPS driver?
Also, do you know if the Holybro F9P comes with a PX4 compatible built-in compass?
@xav04 According to their spec http://www.holybro.com/manual/Holybro_H-RTK_F9P_GNSS_Spec.pdf it does have an ist8310 magnetometer which is supported by VOXL 2.
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Hi @yu-zhang, thank you for your reply! To give you more context, I'm using VOXL2 with the 5G Modem Carrier Board, so I'm not able to use the VOXL 2 USB3.0 / UART Expansion as @Eric-Katzfey suggested to access to that UART port. However, I found that the 5G Modem, in the J9 port has an i2c+Apps UART. Do you think I could use this port to connect the sparkfun via the standard PX4 GPS driver?
Also, do you know if the Holybro F9P comes with a PX4 compatible built-in compass?
@xav04 Yes, the M0090 5G board does have a UART and I2C that you can use on J9.
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@Eric-Katzfey and @yu-zhang thank you very much! I'll get the module and test it.
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Hi @yu-zhang, thank you for your reply! To give you more context, I'm using VOXL2 with the 5G Modem Carrier Board, so I'm not able to use the VOXL 2 USB3.0 / UART Expansion as @Eric-Katzfey suggested to access to that UART port. However, I found that the 5G Modem, in the J9 port has an i2c+Apps UART. Do you think I could use this port to connect the sparkfun via the standard PX4 GPS driver?
Also, do you know if the Holybro F9P comes with a PX4 compatible built-in compass?
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