- Fri Oct 24, 2014 4:25 pm
#1921
Squonk wrote:jonsmirl wrote:I don't think the ESP8089 is an older device. It is the same basic chip configured for slave mode. It is used in tablets as a wifi chip.
I found this:
https://github.com/linux-rockchip/kerne ... ss/esp8089
right, and there is esp_android.c which contains some interessting things:
Code: Select allstruct esp_init_table_elem esp_init_table[MAX_ATTR_NUM] = {
{"crystal_26M_en", 48, -1},
{"test_xtal", 49, -1},
{"sdio_configure", 50, -1},
{"bt_configure", 51, -1},
{"bt_protocol", 52, -1},
{"dual_ant_configure", 53, -1},
{"test_uart_configure", 54, -1},
{"share_xtal", 55, -1},
{"gpio_wake", 56, -1},
{"no_auto_sleep", 57, -1},
{"attr10", -1, -1},
{"attr11", -1, -1},
{"attr12", -1, -1},
{"attr13", -1, -1},
{"attr14", -1, -1},
{"attr15", -1, -1},
//attr that is not send to target
{"ext_rst", -1, -1},
{"attr17", -1, -1},
{"attr18", -1, -1},
{"attr19", -1, -1},
{"attr20", -1, -1},
{"attr21", -1, -1},
{"attr22", -1, -1},
{"attr23", -1, -1},
};
we know that to configure ESP8266EX to run with 40MHz crystal one have to change value 30h of the esp_init_data_default.bin (which then have to be burned to 7C000). 30h is 48, so same as in the init table above. Based on that, and the esp_android.c and its defualt config (init_data.conf), i would say when one set 1 on 32h then the chip is working in SPI slave, when 2 then SDIO mode and 0 sets it back to default. That my guess, it need to be checked anyway hardware wise. From a boot message i would say i does works:
when default: ets Jan 8 2013,rst cause:2, boot mode:(3,6)
when set to SPI: ets Jan 8 2013,rst cause:2, boot mode:(3,0)
when set to SDIO:ets Jan 8 2013,rst cause:1, boot mode:(3,1)
then if course due missing hardware the bootloader is still jumping to SPI boot, but as i said, one have to check this with properly hardware configuration.
No idea how and if the other values from the init table are working. EDIT: quick check, i did set 31h to 1, whcih should then change the test_xtal value, and indeed, any firmware is now having clock out set toGPIO0, exactly as escribed in the android / ESP8089 documenation. Nice.
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