ESP8266 Community Forum

- Mon Sep 15, 2014 11:52 am #589 From where do you have this info about what's in the next chip revision?

- Mon Sep 15, 2014 11:55 am #590 I am in contact with Espressif

Where I get my modules

- Tue Sep 16, 2014 3:27 am #615 seems like the built in adc samples with 8 bit resolution.

some over sampling magic is applied to get 10 bit resolution.


my guess: ADC samples with 4MSamples/s. not certain about that.

Code: Select all    read_sar_dout(sardata);

    for (i = 0; i < 8; i++) {
        sar_dout += sardata[i];
        ADC_DBG("%d, ", sardata[i]);
    }

    tout = (sar_dout + 8) >> 4;   //tout is 10 bits fraction

what do you think is all this glue code for? disabling adc after sampling?

Code: Select all    i2c_writeReg_Mask_def(i2c_saradc, i2c_saradc_en_test, 1); //select test mux

    while (GET_PERI_REG_BITS(0x60000D50, 26, 24) > 0); //wait r_state == 0

    CLEAR_PERI_REG_MASK(0x60000D5C, 0x200000);
    SET_PERI_REG_MASK(0x60000D60, 0x1);    //force_en=1
    CLEAR_PERI_REG_MASK(0x60000D60, 0x1);    //force_en=1


we have seen a software I2C master in the examples, but the ADC Module uses other routines to talk to the i2c ADC.
Is this simply On-Chip: native i2c, off Chip: bitbang i2c?

- Tue Sep 16, 2014 9:03 am #640

from the current specs "ESP8266EX integrates a generic purpose 10-bit analog ADC.

Where is the "current specs" ? I don't see it in the documentation links.