Back to the old firmware based on OpenWrt CC. So only file related is /lib/netifd/wireless/ralink.sh

#!/bin/sh
. /lib/netifd/netifd-wireless.sh

init_wireless_driver "$@"
maclist=""
force_channel=""

drv_ralink_init_device_config() {
	config_add_string country variant log_level short_preamble
	config_add_boolean noscan
	config_add_int channel
}

drv_ralink_init_iface_config() {
	config_add_string 'auth_server:host'
	config_add_string auth_secret
	config_add_int 'auth_port:port'

	config_add_string ifname apname mode ssid encryption key key1 key2 key3 key4 wps_pushbutton macfilter led
        config_add_boolean hidden isolate
        config_add_array 'maclist:list(macaddr)'
}

drv_ralink_cleanup() {
	logger drv_ralink_cleanup
}

ralink_setup_ap(){
	local name="$1"
	local eap=0

	json_select config
	json_get_vars mode ifname ssid encryption key key1 key2 key3 key4 wps_pushbutton server port hidden isolate macfilter
	json_get_values maclist maclist

	ifconfig $ifname up

	[ -z "$force_channel" ] || iwpriv $ifname set Channel=$force_channel
	[ "$isolate" = 1 ] || isolate=0
	iwpriv $ifname set NoForwarding=$isolate
	iwpriv $ifname set NoForwardingBTNBSSID=$isolate
	iwpriv $ifname set NoForwardingMBCast=$isolate
	
	[ "$hidden" = 1 ] || hidden=0
	iwpriv $ifname set HideSSID=$hidden

	wsc_methods=0
	wsc_mode=0
	case "$encryption" in
	psk*|mixed*)
		local enc="WPA2PSK"
		case "$encryption" in
			psk | psk+*) enc=WPAPSK;;
			psk2 | psk2*) enc=WPA2PSK;;
			mixed*) enc=WPAPSKWPA2PSK;;
			wpa | wpa+*) eap=1; enc=WPA;;
			wpa2*) eap=1; enc=WPA2;;
		esac
		local crypto="AES"
		case "$encryption" in
			*tkip+aes*) crypto=TKIPAES;;
			*tkip*) crypto=TKIP;;
		esac
		[ "$eap" = "1" ] && {
			iwpriv $ifname set RADIUS_Server=$server
			iwpriv $ifname set RADIUS_Port=$port
			iwpriv $ifname set RADIUS_Key=$key
			iwpriv $ifname set own_ip_addr=192.168.1.1
			iwpriv $ifname set IEEE8021X=0
			iwpriv $ifname set EAPifname=eth0.2
			iwpriv $ifname set PreAuthIfname=br-lan
		}
		iwpriv $ifname set AuthMode=$enc
		iwpriv $ifname set EncrypType=$crypto
		iwpriv $ifname set IEEE8021X=0
		iwpriv $ifname set "SSID=${ssid}"
		[ "$eap" = "1" ] || iwpriv $ifname set "WPAPSK=${key}"
		iwpriv $ifname set DefaultKeyID=2
		iwpriv $ifname set "SSID=${ssid}"
		if [ "$wps_pushbutton" == "1" ]; then
			wsc_methods=128
			wsc_mode=7
		fi
		;;
	wep)
		iwpriv $ifname set AuthMode=WEPAUTO
		iwpriv $ifname set EncrypType=WEP
		iwpriv $ifname set IEEE8021X=0
		for idx in 1 2 3 4; do
			json_get_var keyn key${idx}
			[ -n "$keyn" ] && iwpriv $ifname set "Key${idx}=${keyn}"
		done
		iwpriv $ifname set DefaultKeyID=${key}
		iwpriv $ifname set "SSID=${ssid}"
		;;
	none)
		iwpriv $ifname set "SSID=${ssid}"
		;;
	esac

	iwpriv $ifname set WscConfMode=$wsc_mode
	iwpriv $ifname set WscConfStatus=2
	iwpriv $ifname set WscMode=2
	iwpriv $ifname set ACLClearAll=1
	[ -n "$maclist" ] && {
		for m in ${maclist}; do
			logger iwpriv $ifname set ACLAddEntry="$m"
			iwpriv $ifname set ACLAddEntry="$m"
		done
	}
	case "$macfilter" in
	allow)
		iwpriv $ifname set AccessPolicy=1
		;;
	deny)
		iwpriv $ifname set AccessPolicy=2
		;;
	*)
		iwpriv $ifname set AccessPolicy=0
		;;
	esac
	json_select ..


	wireless_add_vif "$name" "$ifname"
}

ralink_setup_sta(){
	local name="$1"

	json_select config
	json_get_vars mode apname ifname ssid encryption key key1 key2 key3 key4 wps_pushbutton disabled led

	[ "$disabled" = "1" ] && return

	key=
	case "$encryption" in
		psk*|mixed*) json_get_vars key;;
		wep) json_get_var key key1;;
	esac
	json_select ..

	/sbin/ap_client "ra0" "$ifname" "${ssid}" "${key}" "${led}"
	sleep 1
	wireless_add_process "$(cat /tmp/apcli-${ifname}.pid)" /sbin/ap_client ra0 "$ifname" "${ssid}" "${key}" "${led}"

	wireless_add_vif "$name" "$ifname"
}

drv_ralink_setup() {
	local ifname="$1"
	local bcn_active=0
	wmode=9
	VHT=0
	VHT_SGI=0
	HT=0
	EXTCHA=0

	sta_disabled="$(uci get wireless.sta.disabled)"

	[ "${sta_disabled}" = "1" ] && bcn_active=1

	json_select config
	json_get_vars variant country channel htmode log_level short_preamble noscan:0
	json_select ..

	[ "$short_preamble" = 1 ] || short_preamble=0 

	case ${htmode:-none} in
	HT20)
		wmode=10
		HT=0
		;;
	HT40)
		wmode=10
		HT=1
		EXTCHA=1
		;;
	VHT20)
		wmode=15
		HT=0
		VHT=0
		VHT_SGI=1
		;;
	VHT40)
		wmode=15
		HT=1
		VHT=0
		VHT_SGI=1
		EXTCHA=1
		;;
	VHT80)
		wmode=15
		HT=1
		VHT=1
		VHT_SGI=1
		EXTCHA=1
		;;
	*)
		case $hwmode in
		a) wmode=2;;
		g) wmode=3;;
		esac
		;;
	esac

	if [ "$auto_channel" -gt 0 ]; then
		force_channel=""
		channel=0
		auto_channel=3
	else
		force_channel=$channel
		auto_channel=0
	fi

	coex=1
	[ "$noscan" -gt 0 ] && coex=0

	cat /etc/Wireless/${variant}_tpl.dat > /tmp/${variant}.dat
	cat >> /tmp/${variant}.dat << EOF
Beacon=${bcn_active}
BssidNum=4
HT_BW=${HT:-0}
HT_EXTCHA=${EXTCHA:-0}
CountryCode=${country}
WirelessMode=${wmode:-9}
Channel=${channel:-8}
AutoChannelSelect=$auto_channel
Debug=${log_level:-3}
SSID1=${ssid:-OpenWrt}
HT_BSSCoexistence=$coex
WscConfMethods=680
EOF
	for_each_interface "ap" ralink_setup_ap
	for_each_interface "sta" ralink_setup_sta
	wireless_set_up
	LED="$(uci get wireless.sta.led)"
	sta_disabled="$(uci get wireless.sta.disabled)"
	[ "${sta_disabled}" = "1" -a -n "${LED}" -a -f /sys/class/leds/${LED}/trigger ] && ap_client ${LED} set
}

ralink_teardown() {
	json_select config
	json_get_vars ifname
	json_select ..

	ifconfig $ifname down

	LED="$(uci get wireless.sta.led)"
	[ -n "${LED}" -a -f /sys/class/leds/${LED}/trigger ] && ap_client ${LED} clear
}

drv_ralink_teardown() {
	wireless_process_kill_all
	for_each_interface "ap sta" ralink_teardown
}

add_driver ralink

This code is using iwpriv setting up the driver, so it should be directly working.
drv_ralink_setup get country, channel, htmode, and setting this in driver.
then enable every ap interface and sta interface by ralink_setup_ap/ralink_setup_sta.

ralink_setup_ap get "mode ifname ssid encryption key key1 key2 key3 key4 wps_pushbutton server port hidden isolate macfilter" and setting up those value in mt7628.ko by iwpriv directly.

ralink_setup_sta is the ap+sta mode, it will call /sbin/ap_client to setup the ap+sta mode.

Everything is clear, I can make my own ralink.sh based on this beautiful script 🙂

I have updated the screen SDK and ADD RASPBERRY PI support, it is in SDK named lib/raspi/libvodisp.so

Like all other linux system, raspberry pi must use root to send data through USB…my raspberryPi is very slow(maybe it is because its index is zero, power consume is pretty high…1 watt+ 🙂

Currently SDK already has base function to show something on the screen, but still left a lot to do…

1. More Color Mode Support: 8bit colors, 16bit colors

enable this to support more games with less CPU, such as NEOGEO/FC, etc…

2. Linux Kernel Driver(fbcon)

enable this to enable console data directly output to screen and a real frame buffer function.

3. Rotated/Mirror Support

hardware support for fast convert speed.

4. RGB/BGR Pixel Order

5. Backlight PWM Control

6. Touch Screen

…

Hopefully once I finish step 1 and 2 in a few weeks, I can open source the kernel code. Currently this core firmware code is write by C and ASM and it is very ugly(or tricky) anyway I do not plan to open source it. But I will provide blob(vodisp.ko) with detailed documentation and interfaces later.

Actually the interface of vodisp.ko is pretty simple, just two, one is used to setting up the chip — I call it “connect” or “open”, another is used to send RGB or BGR pixel data from USB to screen, I call it “write”.

Emm, I guess we can use standard C interface for driver: open/close/write/ioctl, ioctl is good enough do the setting up job 🙂