GPIO16 and setting RST line

[geo.espressif]

Could anyone help me with some code to set GPIO16 low, it appears to be interfering with our ability to reset the device (it's causing a fight over reset line being low/high). There don't seem to be any register definitions for it in eagle_soc.h

James

[dkinzer]

Could anyone help me with some code to set GPIO16 low

For future reference, the Arduino-ESP8266 code is a good place to begin researching how to accomplish something on the ESP8266.

To use GPIO16, you must map it to be an I/O pin somewhere in your initialization:

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uint32_t val;

// map GPIO16 as an I/O pin
val = READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc;
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, val | 0x00000001);
val = READ_PERI_REG(RTC_GPIO_CONF) & 0xfffffffe;
WRITE_PERI_REG(RTC_GPIO_CONF, val | 0x00000000);

Then, to set GPIO16 high or low:

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// set the pin state first, then enable output
val = READ_PERI_REG(RTC_GPIO_OUT);
WRITE_PERI_REG(RTC_GPIO_OUT, pinHigh ? (val | 1) : (val & ~1));
val = READ_PERI_REG(RTC_GPIO_ENABLE);
WRITE_PERI_REG(RTC_GPIO_ENABLE, val | 1);

For completeness, this is how you read GPIO16 as an input:

Code: Select all

// set as an input
val = READ_PERI_REG(RTC_GPIO_ENABLE);
WRITE_PERI_REG(RTC_GPIO_ENABLE, val & ~1);

// read the input state
val = READ_PERI_REG(RTC_GPIO_IN_DATA) & 1);

[geo.espressif]

Awesome, thanks!

[fengwanjun]

I use your code .
But like the old ones. When gpio16_output_set(0),it goes like a system reset.
Why????