Raspi 4B with Heltec HT-HC01P (with debug board)

General
1

I am using the attached openwrt version in this directory from the Heltec Website
But the files doesn’t specify any RPI connection from HT-HC01P for the overlay used by Heltec
I extracted the flashable file and tried reading the DTBO file but its garbled
Already reached out to Heltec but still have not received any reply

2

Hi @lenka

The dtb file is binary, so you will need to use dtc to decompile it. See attached decompiled mm610x-spi.dts

/dts-v1/;

/ {
        compatible = "brcm,bcm2835\0brcm,bcm2836\0brcm,bcm2708\0brcm,bcm2709\0brcm,bcm2711";

        fragment@0 {
                target = <0xffffffff>;

                __overlay__ {
                        pinctrl-0 = <0x01 0x02>;
                        cs-gpios = <0xffffffff 0x08 0x01>;
                        #address-cells = <0x01>;
                        #size-cells = <0x00>;
                        status = "okay";
                        phandle = <0x03>;

                        mm6108@0 {
                                compatible = "morse,mm610x-spi";
                                reg = <0x00>;
                                reset-gpios = <0xffffffff 0x05 0x00>;
                                power-gpios = <0xffffffff 0x03 0x00 0xffffffff 0x07 0x00>;
                                spi-irq-gpios = <0xffffffff 0x19 0x00>;
                                spi-max-frequency = <0x2faf080>;
                                status = "okay";
                                phandle = <0x04>;
                        };

                        spidev@0 {
                                reg = <0x00>;
                                status = "disabled";
                                phandle = <0x05>;
                        };

                        spidev@1 {
                                reg = <0x01>;
                                status = "disabled";
                                phandle = <0x06>;
                        };
                };
        };

        fragment@1 {
                target = <0xffffffff>;

                __overlay__ {

                        spi0_cs_pins {
                                brcm,pins = <0x08>;
                                brcm,function = <0x01>;
                                brcm,pull = <0x02>;
                                phandle = <0x02>;
                        };

                        spi0_pins {
                                brcm,pull = <0x02 0x02 0x02>;
                                phandle = <0x01>;
                        };
                };
        };

        __symbols__ {
                frag0 = "/fragment@0/__overlay__";
                mm6108 = "/fragment@0/__overlay__/mm6108@0";
                spidev0 = "/fragment@0/__overlay__/spidev@0";
                spidev1 = "/fragment@0/__overlay__/spidev@1";
                spi0_cs_pins = "/fragment@1/__overlay__/spi0_cs_pins";
                spi0_pins = "/fragment@1/__overlay__/spi0_pins";
        };

        __fixups__ {
                spi0 = "/fragment@0:target:0";
                gpio = "/fragment@0/__overlay__:cs-gpios:0\0/fragment@0/__overlay__/mm6108@0:reset-gpios:0\0/fragment@0/__overlay__/mm6108@0:power-gpios:0\0/fragment@0/__overlay__/mm6108@0:power-gpios:12\0/fragment@0/__overlay__/mm6108@0:spi-irq-gpios:0\0/fragment@1:target:0";
        };

        __local_fixups__ {

                fragment@0 {

                        __overlay__ {
                                pinctrl-0 = <0x00 0x04>;
                        };
                };
        };
};

Note that this is the same pinout used for the Raspberry Pi hat used in our EKH01 evaluation kit, with resistors populated for SPI. Schematics available here

3

I am trying get HT-HC01P +debug EVB working with RPi4. Table below shows connections between EVB pins and RPi GPIOs

image
image473×558 16.6 KB

I tried openwrt-23.05.5-2.8.5-20251107-rpi4-HT-HC01P-sysupgrade.img and openwrt-morse-2.8.5-morsemicro-mm6108-ekh01-squashfs-sysupgrade.img
I also tried RPi+WM1302+WM6108 configuration but with the same result - system doesn’t see the Halow board. It gives me this error message => “Error: No HaLow radio found”
It looks like I am missing something very basic here. Can you please, guide me how to get it working?

4

Hi @evgyank2025

Thanks for sharing the pinout table. Please try connecting WAKE and BUSY to pins 3 and 7 respectively and see if that helps your interface become detected. Also, make sure to keep leads short, as the SPI bus will operate with quite fast rise times, and poor signal integrity can prevent the host from communicating with the board.

If you can share the output of dmesg when using the Heltec image, we can help explain why it might not be detected.