sforkowany z mirror/meshtastic-firmware
51 wiersze
2.4 KiB
Markdown
51 wiersze
2.4 KiB
Markdown
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# Notes on the pine64 lora board
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like before but sx1262 based?
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Since both DIO3 and DIO2 not apply to PINE64 LoRa situation, I will wire SX1262 INT [DIO1] pin, contact to CS341F pin 7 INT# and pin 5.
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FIX ch341 GPIO access from linux
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RF95 packet RX seems busted FIX FIRST
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USE ch341 devboard if needed
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SX1262 BUSY seems to come out on pin 15 of the RFM90 HOPE module. The 'footprint' seems rotated on the pine64 board schematic and that becomes pin 7 on U4 which is "DIO5" on that schematic. Which goes to pin 8 on the CH341F, which that datasheet calls "IN3"
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FIXME - see if possible to read BUSY from "IN3"?
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on a ch341a
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* - Pin 15 (D0/CS0 ) as input/output/CS (CH341_PIN_MODE_IN/CH341_PIN_MODE_OUT/CH341_PIN_MODE_CS) (confirm hooked to CS)
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* - Pin 16 (D1/CS1 ) as input/output/CS (CH341_PIN_MODE_IN/CH341_PIN_MODE_OUT/CH341_PIN_MODE_CS)
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* - Pin 17 (D2/CS2 ) as input/output/CS (CH341_PIN_MODE_IN/CH341_PIN_MODE_OUT/CH341_PIN_MODE_CS)
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* - Pin 19 (D4/DOUT2) as input/output (CH341_PIN_MODE_IN/CH341_PIN_MODE_OUT) / gpio4 in linux driver / (FIXME: confirm hooked to IRQ also?)
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* - Pin 21 (D6/DIN2 ) as input (CH341_PIN_MODE_IN) / called RTS when in UART mode
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## ch341-driver
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driver busted in 5.11 kernels (rf95 init fails). 5.8.0 is okay, 5.8.18 is okay. fails on 5.10.31, 5.9.16 is okay. Therefore breakage happened in 5.10 kernels! Possibly not really breakage, possibly just sloppy caching or something that is more easily caught with modern threading.
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cs_change is not being set on the way into the driver!
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## gpio
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the new GPIO interface https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/
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~/development/meshtastic/meshtastic-esp32$ gpiodetect
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gpiochip0 [INT34BB:00] (312 lines)
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gpiochip1 [ch341] (2 lines)
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~/development/meshtastic/meshtastic-esp32$ gpioinfo 1
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gpiochip1 - 2 lines:
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line 0: "gpio4" unused input active-high
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line 1: "gpio5" unused input active-high
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gpiofind gpio4
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gpiochip1 0
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DO NOT "apt install libgpiod-dev" It doesn't work with kernels newer than about 5.8. Instead build and install from source: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/
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## Send in patch
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Fix drivers/spi/spi.c transfer_once
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read about spi: https://elinux.org/images/2/20/Whats_going_on_with_SPI--mark_brown.pdf
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https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html
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git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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