WY7688

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WY7688

  • Suppor 3.3V or 5V power supply

Reference Schematic

WY Board

Specification

Pin Definition

Mt7688an 07.jpg

Wy board pin definition 01.png

  • 调试串口 = debug serial port, 编程电压 =programe voltage, 时钟输出 = clock output
  • Pin Function 1 Function 2 Function 3 Function 4
  • 1 UART_TXD0 GPIO # 12
  • 2 3.3V 3.3V power supply
  • 3 UART_RXD0 GPIO # 13
  • 4 I2S_WS I2C_SCLK GPIO # 2 PCMCLK
  • 5 I2S_SDO I2C_SD GPIO # 1 PCMDTX
  • 6 I2S_CLK I2C_SD GPIO # 3 PCMFS
  • 7 GPIO0 GPIO # 11 REF_CLKO PERST_N
  • 8 I2S_SDI I2C_SCLK GPIO # 0 PCMDRX
  • 9 I2C_SD GPIO # 5
  • 10 I2C_SCLK GPIO # 4
  • 11 SPI_CS1 GPIO # 6 REF_CLKO
  • 12 SPI_CLK GPO # 7
  • 13 SPI_MISO GPIO # 9
  • 14 SPI_CS0 GPIO # 10
  • 15 SPI_MOSI GPIO # 8
  • 16 MDI_RP_P0
  • 17 MDI_RN_P0
  • 18 MDI_TP_P0
  • 19 MDI_TN_P0
  • 20 MDI_TP_P1 SPIS_CS GPIO # 14 PWM_CH0
  • 21 MDI_TN_P1 SPIS_CLK GPIO # 15 PWM_CH1
  • 22 MDI_RP_P1 SPIS_MISO GPIO # 16 UART_TXD2
  • 23 MDI_RN_P1 SPIS_MOSI GPIO # 17 UART_RXD2
  • 24 VDD_FLASH Flash programming voltage
  • 25 5.0V 5.0V power supply
  • 26 GND power ground
  • 27 UART_TXD1 GPIO # 45
  • 28 PERST_N GPIO # 36
  • 29 UART_RXD1 GPIO # 46
  • 30 WDT_RST_N GPO # 37
  • 31 REF_CLKO GPIO # 38
  • 32 EPH_LED1_N GPIO # 33
  • 33 WLED_N GPIO # 35
  • 34 EPH_LED0_N GPIO # 34
  • 35 SD_D0 MDI_RN_P3 GPIO # 25
  • 36 SD_CLK MDI_RP_P4 GPIO # 26
  • 37 SD_D1 MDI_RP_P3 GPIO # 24
  • 38 SD_CD MDI_TN_P3 GPIO # 23
  • 39 SD_WP MDI_TP_P3 GPIO # 22
  • 40 SD_D3 MDI_TP_P4 GPIO # 29
  • 41 SD_D2 MDI_TN_P4 GPIO # 27
  • 42 SD_CMD MDI_RN_P4 GPIO # 28
  • 43 PWM_CH1 MDI_RN_P2 GPIO # 19
  • 44 PWM_CH0 MDI_RP_P2 GPIO # 18
  • 45 USB_DP
  • 46 UART_TXD2 MDI_TP_P2 GPIO # 20 PWM_CH2
  • 47 USB_DM
  • 48 UART_RXD2 MDI_TN_P2 GPIO # 21 PWM_CH3

Stack Installation

Mt7688an 09.jpg

Hardware Design Guide (Development Board)

  • UART0 recommended for system debug only
  • main board should not draw over 100mA from pin 3.3V
  • SPI, IIS, UART1, UART2, PWM, USB, IIC can be added if need
  • More information please read schematic of test board PDF in documents
  • Play wav from TF card comman aplay -f cd -M ctl.wav
  • IO test, press WPS button for more than two seconds, this will be detect by Uboot and run GPIO test demo code.
  • Middle net port is WLAN, side is ethernet

Pin Confliction

  • If use SD card, ethernet 3 and 4 can not be used.
  • If use PWM, ethernet 2 can not be used.

Software

  • Support MTK official linux 2.6.36SDK,OpenWrt 3.10SDK,eCos SDK
  • Support OpenWrt official latest OpenWrt
  • U-boot - system lead, like windows bios
  • openwrt - system
  • art - wifi tune-up file

File download

Type Original Link Local Download Note
Firmware - PandoraBox MT7628AN_EVB
Firmware - WY Testing Firmware - File:Wy-openwrt-mt7688an.zip Support to test all on testing board resources.
Firmware - WY OpenWrt Firmware SDK file (google drive link), 5PortEPHY.bin + dl.bin Based on linux 3.18.45 core
UBoot + source (RaLink UBoot 4.3 version) - .bin+source UBoot
Uboot/sdk tool - cross-complier - cross-compiler
MTK Official SDK MediaTek_ApSoC_SDK? SDK file (google drive link), File:MTK APSoC SDK User Manual.pdf
MTK Official OpenWrt ? SDK file (google drive link), File:MTK-OpenWrt-3.10.14-SDK-Release-Notes.docx.zip
Script - AP-Client - File:Ap-client script.zip

Uboot Option

Uboot option.jpg
  • Enter when in 2-5 into update mode, enter when more than 7 seconds into GPIO test mode
  • Update mode also support serial port, or FTP mode


System backup

  • Update or backup via SPI Flash programmer see on this page Memory
  • Update U-Boot.bin file via programmer directly (address 00000000)

Update firmware via HTTP

  • Connect net cable to WLAN, power cable, serial debugging cable
  • Press WPS button between 2-5 seconds, serial debugging output info will show the board enter into update mode
  • Set your PC which is connected via net cable to board, IP address next to board, for example, if board is 10.10.10.2, then PC should be 10.10.10.3
  • Open 10.10.10.2 in browser and upload firmware, for example openwrt

Update firmware via TFTP

  • Set PCB ethernet IP address 10.10.10.3, use tool(3cdaemon) to setup PC as FTP server, put files in D:\bin\
  • Set U-boot to FTP upload mode, enter IP device/server address 10.10.10.3/10.10.10.2, and then enter file name

Compile U-Boot

  • request cross-compiler
  • copy compiler to /opt folder, tar xjvf
  • copy and use U-boot file, check makefile, it needs complier in opt folder
  • prepare to make -> make menuconfig, all configuration can keep default
  • make (if get java error, install default-jre)
  • finally will get uboot.bin file.
  • If any failure on updating U-boot, need to use SPI-flash programmer

Compile Source Openwrt

  • unzip openwrt, and unzip dl into openwrt folder
  • basic, use make menuconfig, in configuration choose:
Category Setup function
main target -> Ralink RT288x/RT3xxx chipset
main subtarget -> MT7688 based boards chipset
main target profile -> Linkit7688 chipset
network network->SSH->openssh-server SSH
network network->SSH->openssh-sftp-server SFTP
network network->Ser2net Serial2, set /etc/ser2net.conf, to listen on port 8002 and output on serial2 you can set like this: 8002:raw:0:/dev/ttyS0:115200
UVC see USB page
sound card WM8960 Kernel modules -> sound support -> *kmod-sound-core + *kmod-sound-mtk + *kmod-sound-soc-core
sound card WM8960 sound -> *madplay-alsa
sound card WM8960 Utilities -> *alsa-utils
I2C support Kernel modules -> I2S support -> *kmod-i2c-core + *kmod-i2c-ralink Note to check if I2C turn on: i2c@900 { status = "okay"; };
  • Compile other files into firmware: Make new folder in openwrt firmware folder -> mkdir files -> put files into files folder
  • make V=99
  • bin file in /bin/ramips/..

Command control GPIO

  • Dev. board link0 link1 (ephy) corresponding to GPIO43 and42
  • run command mt7688_pinmux get, information shows:
..
Groups ephy - [ephy] gpio
..
  • now run command to set ephy to gpio - > mt7688_pinmux set ephy gpio
  • export GPIO43, first
cd /sys/class/gpio
echo 43 > export
cd gpio43
  • now directoy will be /sys/devices/10000000.palmbus/100006000.gpio/gpio/gpio43/
  • ls will find
active_low device direction edge subsystem uevent value
  • now to check gpio direciton -> cat direction, output in
  • echo out, and check again, output out
  • echo 1 >, or echo 0 >, value will be set

Other functions/modules

  • To use USB camera, see on this page USB

Following I2S for WM8960 sound card

  • Turn on I2S, change to
i2s {
    ralink,group = "i2s";
    ralink,function = "i2s";   // change gpio to i2s
};
  • add ref_clk to provide clock for WM8960, in make file: build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7688/linux-3.18.45/sound/soc/mtk/Makefile
KBUILD_CFLAGS += -DCONFIG_SND_MT76XX_SOC
KBUILD_CFLAGS += -DCONFIG_I2S_WM8960
KBUILD_CFLAGS += -DCONFIG_I2S_IN_MCLK
#KBUILD_CFLAGS += -DCONFIG_I2S_MCLK_12P288MHZ
KBUILD_CFLAGS += -DCONFIG_I2S_MCLK_12MHZ
KBUILD_CFLAGS += -DCONFIG_GDMA_EVERYBODY
KBUILD_CFLAGS += -DSURFBOARDINT_DMA=15
  • Test with following command to play
madplay  xxx.mp3
aplay  xxx.wav

Serial Port Usage

Mt7688 serial.png
  • Use mt7688 serial programming, for the serial port 1,2 need to turn off the soft flow control, the default is open, close the reference picture;
  • Serial 2 can not use the problem: in the kernel directory arch / mips / ralink / mt7620.c inside the prom_soc_init function which add the following code:

u32 cfg; cfg = __raw_readl (sysc + 0x3c); cfg | = 0x0f; cfg | = 0x10; cfg | = 0x0f << 17; __raw_writel (cfg, sysc + 0x3c); Note: modify only use the network port 0, for the network port 1-4 can not be used.