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Dobrica Pavlinušić's random unstructured stuff
esp8089: Revision 18
use [esp8266] module over sdio on [cubieboard] as wifi card
{toc: } ^ links https://hackaday.io/project/8678-rpi-wifi-hat https://github.com/al177/esp8089 ^ setup ^^ cubieboard pinout .pre root@cubieboard:/home/dpavlin# cat mmc3-sdio.txt 22 PI4 2 1 2 [mmc mmc3] SCD3_CMD 24 PI5 2 1 2 [mmc mmc3] SCD3_CLK 26 PI6 2 1 2 [mmc mmc3] SCD3_D0 28 PI7 2 1 2 [mmc mmc3] SCD3_D1 30 PI8 2 1 2 [mmc mmc3] SCD3_D2 32 PI9 2 1 2 [mmc mmc3] SCD4_D3 .pre ^^ ESP-201 pinout from top .pre 15 IO0 13 IO15 14 IO2 12 IO13 18 D2 GPIO9 10 IO12 21 CLK GPIO6 9 IO14 20 CMD GPIO11 8 XPD GPIO16 22 D0 GPIO7 7 CHIP_EN 23 D1 GPIO8 32 RST 19 D3 GPIO10 6 TOUT ADC 16 IO4 24 IO5 3.3V GND 3.3V GND .pre ^^ CH_EN mapping to GPIO pin .pre PE4 "132" => "PE4", -> CHIP_EN root@cubieboard:/home/dpavlin/linux-gpio-pinout# modprobe esp8089 esp_reset_gpio=132 # PE4 [Sun Jun 30 19:19:24 2019] ***** EAGLE DRIVER VER:bdf5087c3deb***** [Sun Jun 30 19:19:24 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:35 2019] esp_sdio_init ------ RETRY ------ [Sun Jun 30 19:19:35 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:35 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:46 2019] esp_sdio_init ------ RETRY ------ [Sun Jun 30 19:19:46 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:47 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:58 2019] esp_sdio_init ------ RETRY ------ [Sun Jun 30 19:19:58 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:19:58 2019] ESP8089 reset via GPIO 132 [Sun Jun 30 19:20:09 2019] esp_sdio_init ------ RETRY ------ [Sun Jun 30 19:20:09 2019] ESP8089 reset via GPIO 132 modprobe: ERROR: could not insert 'esp8089': No such device [Sun Jun 30 19:20:10 2019] eagle sdio can not power up! .pre ^ additional components https://hackaday.io/project/8678-rpi-wifi/details missing 200 ohm resistors on sdio lines 4.7k pullup on CH_PD https://github.com/al177/esp8089/issues/4 rpi needs dtoverlay=sdio,poll_once=false it's still not clear to me do I have to remove spi flash or not newer project with simpler overview * https://hackaday.io/project/12980-pi2wifi * https://sites.google.com/site/mincepi/pi2wifi it suggests 33 ohm resistors on sdio, includes dts overlay) https://hackaday.io/project/8678/instructions also suggest 33 ohm resistors... ^ clear the QE (quad enable) bit in the sreg2 of a W25Q40BV or similar https://github.com/jacksonliam/rpi-bitbang-spiflash ^ bootloader ^^ setup boudrate to 74880 {file: anyboud.c} https://gist.githubusercontent.com/sentinelt/3f1a984533556cf890d9/raw/8a35958138b1167fce5c2301a73e2fe06aeb08d8/gistfile1.c You have to first open terminal in some valid baud rate .pre root@cubieboard:~# microcom -p /dev/ttyS1 .pre and then in another terminal force new speed for port with: .pre dpavlin@cubieboard:~/anybaud$ ./anyboud /dev/ttyS1 74880 Changed successfully. .pre ^^ boot modes https://github.com/esp8266/esp8266-wiki/wiki/Boot-Process#esp-boot-modes The Espressif code can boot in different modes, selected on power-up based on GPIO pin levels. (MTDO is equivalent to GPIO15). | MTDO | GPIO0 | GPIO2 | Mode | Description | | L | L | H | UART | Download code from UART | | L | H | H | Flash | Boot from SPI Flash | | H | x | x | SDIO | Boot from SD-card | In the bootup message 'boot mode:(x,y)' three low bits of x are {MTDO, GPIO0, GPIO2}. ^^^ IO15 -> 3V3 My guess from espressif powerpoint this is sdio boot mode (and it doesn't work for me right now) .pre ets Jan 8 2013,rst cause:1, boot mode:(7,7) waiting for host .pre ^^^ IO15 -> GND According to hackaday thread, this is correct way to force SDIO mode, serial output is: .pre ets Jan 8 2013,rst cause:1, boot mode:(3,7) load 0x40100000, len 31020, room 16 ets Jan 8 2013,rst cause:1, boot mode:(3,7) .pre This seems like loading from spi flash to me. If I don't touch kernel module, but just toggle CH_EN pin .pre root@cubieboard:/home/dpavlin# cat esp-reset.sh #!/bin/sh -xe cd /sys/class/gpio/ echo 132 > export echo out > gpio132/direction echo 0 > gpio132/value echo 1 > gpio132/value echo 132 > unexport root@cubieboard:/home/dpavlin# .pre I get full bootloader output: .pre ets Jan 8 2013,rst cause:1, boot mode:(3,7) load 0x40100000, len 31020, room 16 tail 12 chksum 0x79 ho 0 tail 12 room 4 load 0x3ffe8000, len 2888, room 12 tail 12 chksum 0x6a ho 0 tail 12 room 4 load 0x3ffe8b50, len 14864, room 12 tail 4 chksum 0x45 csum 0x45 .pre It seems that esp tries to load first part, but fails and kernel module toggle CH_PD and resets it. Time to try soldering resistors between 200 and 33 ohms I guess... |