Matek F411 Wing full soft serial 2 port (RX/TX) on S2/S7

[SnappyFPV]

Current Behavior

The Matek F411 Wing with SFTSRL2 Firmare has 2x Softserial but just 2x TX no RX/TX

Desired Behavior

It would be better to have a third "full" serial with RX TX as Serial 2 and leave Serial 1 as TX only.

Suggested Solution

The most unused connections on a Matek F411 Wing are S2/S7 solder Pads (PB5/PA15). I don't know if a additional adjustment for the timer needed (S2/S7 are actual on different timer) ? - i just test this with defined S5/S6 (same timer) as Soft Serial 2 RX/TX and it worked great (tested with a GPS connected).

#if defined(MATEKF411_SFTSRL2) #define USE_SOFTSERIAL1 #define SOFTSERIAL_1_TX_PIN PA0 // ST1 pad #define SOFTSERIAL_1_RX_PIN PA0 #define USE_SOFTSERIAL2 #define SOFTSERIAL_2_TX_PIN PB5 // S2 #define SOFTSERIAL_2_RX_PIN PA15 // S7 #define SERIAL_PORT_COUNT 5

Who does this impact? Who is this for?

Additional CPU based serial port on Matek F411 for example to use ESP32 LORA INavRadar - when UART 1/2 is in use for CRSF/GPS.

[SnappyFPV]

DEF_TIM(TIM3, CH1, PB4,  TIM_USE_MC_MOTOR | TIM_USE_FW_MOTOR,  0, 0), // S1_OUT
DEF_TIM(TIM3, CH2, PB5,  TIM_USE_MC_MOTOR | TIM_USE_FW_MOTOR,  0, 0), // S2_OUT
DEF_TIM(TIM4, CH1, PB6,  TIM_USE_MC_MOTOR | TIM_USE_FW_SERVO,  0, 0), // S3_OUT
DEF_TIM(TIM4, CH2, PB7,  TIM_USE_MC_MOTOR | TIM_USE_FW_SERVO,  0, 0), // S4_OUT
DEF_TIM(TIM2, CH2, PB3,  TIM_USE_MC_SERVO | TIM_USE_FW_SERVO, 0, 0), // S5
DEF_TIM(TIM2, CH3, PB10, TIM_USE_MC_SERVO | TIM_USE_FW_SERVO, 0, 0), // S6
DEF_TIM(TIM2, CH1, PA15, TIM_USE_MC_SERVO | TIM_USE_FW_SERVO, 0, 0), // S7
DEF_TIM(TIM1, CH1, PA8,  TIM_USE_ANY,   0, 0), //softserial_tx2 - 2812LED TIM_USE_LED
DEF_TIM(TIM5, CH1, PA0,  TIM_USE_PPM,   0, 0), //use rssi pad for PPM/softserial_tx1

Any changes here needed when PB5 and PA15 are should used as RX/TX?

[joeclone]

Maybe this #4567

[Alejandro-pucci]

Hi Snappy,

I am also interested in an extra "full" softserial port. Are you saying you have built a working binary with softserial1 tx on ST1/RSSI pad and softserial2 rx/tx on S5/S6? If so, could you please share it? :) Thanks,

Alejandro

[konraddi]

Is it technically possible to get another RX/TX interface? I could need it for two F411-Wing builds (FX-61 and Twinstar) that I would like to upgrade with iNav radar but lacking one UART for the ESP32 board (UARTs used by GPS and CRSF).

Many thanks in advance,
Konrad

[KorayZ]

has this been made into a firmware build or anything? Kind of new to this but want to hook up CSRF for bluetooth connectivitely, only to find out today it needs another uart since i use both gps and csrf. If so, does anyone have the file?

[shellixyz]

You can try this build with a full-duplex softserial on ST1(TX)/LED(RX):
inav_2.1.0_MATEKF411_FD_SFTSRL.hex.zip

[shellixyz]

We could use S3/S4 for softserial but then we will need to change stuff in the firmware/configurator so that the displayed output mapping is correct.

[SnappyFPV]

i tried s2/led but it doesnt work only on s5/s6 (servo 3/4) i think there must be changes in timer also - for s5/s6 timer are the same in code

[shellixyz]

Using S2 is a bad idea because it uses the same timer as S1. We can't change the timers they are bound to pins and there is only one available per pin for the pins used by this board on this MCU.

[Dronek]

You can try this build with a full-duplex softserial on ST1(TX)/LED(RX):
inav_2.1.0_MATEKF411_FD_SFTSRL.hex.zip

Please add this as a default asset for future inav releases. Thanks.

[konraddi]

Is it available for 2.2.0 yet? I would like to use it with Inav radar. Uart 1 = crsf, uart 2= msp on ESP32 and softserial = GPS. This should work? Thanks, Konrad Dronek <notifications@github.com> schrieb am Mo., 27. Mai 2019, 06:48:

…

You can try this build with a full-duplex softserial on ST1(TX)/LED(RX): inav_2.1.0_MATEKF411_FD_SFTSRL.hex.zip <https://github.com/iNavFlight/inav/files/3124046/inav_2.1.0_MATEKF411_FD_SFTSRL.hex.zip> Please add this as a default asset for future inav releases. Thanks. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#4611?email_source=notifications&email_token=AHGHZ5VG2FVVHW56GBEDBRDPXNRYZA5CNFSM4HF2XECKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODWIYKAA#issuecomment-496076032>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AHGHZ5TIMXCV24DH3WU44STPXNRYZANCNFSM4HF2XECA> .

[shellixyz]

@konraddi @Dronek It is not available yet. I will make a PR for 2.2-RC2

[padcom]

Should it be possible to use the software serial for MSP over CRSF? I am using it at 57600 bauds (I also tried 19200 but absolutely nothing happens) and the communication stops after receiving the MultiWii API version 2.3.0. Then I get the 10s timeout and that's it.