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Separate pullup config out of gpio_enable()

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Created `gpio_set_pullup` to configure pullups independently of direction.
Removed GPIO_INPUT_PULLUP direction type.
Added misc other helper functions in iomux.h
This commit is contained in:
Alex Stewart 2016-02-21 18:34:11 -08:00
parent 7c1d7fb43e
commit c36feab845
4 changed files with 73 additions and 34 deletions
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26
core/include/esp/gpio.h
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@ -17,14 +17,21 @@ typedef enum {
GPIO_INPUT,
GPIO_OUTPUT, /* "Standard" push-pull output */
GPIO_OUT_OPEN_DRAIN, /* Open drain output */
GPIO_INPUT_PULLUP,
} gpio_direction_t;
/* Enable GPIO on the specified pin, and set it to input/output/ with
* pullup as needed
/* Enable GPIO on the specified pin, and set it to input or output mode
*/
void gpio_enable(const uint8_t gpio_num, const gpio_direction_t direction);
/* Enable/disable internal pullup resistor for a particular GPIO
*
* Note: According to Espressif, pullup resistor values are between 30K and
* 100K ohms (see http://bbs.espressif.com/viewtopic.php?t=1079#p4097)
* However, measured values suggest that the actual value is likely to be close
* to 47K in reality.
*/
void gpio_set_pullup(uint8_t gpio_num, bool enabled, bool enabled_during_sleep);
/* Disable GPIO on the specified pin, and set it Hi-Z.
*
* If later muxing this pin to a different function, make sure to set
@ -36,6 +43,19 @@ static inline void gpio_disable(const uint8_t gpio_num)
*gpio_iomux_reg(gpio_num) &= ~IOMUX_PIN_OUTPUT_ENABLE;
}
/* Set whether the specified pin continues to drive its output when the ESP8266
* goes into sleep mode. Note that this setting is reset to off whenever
* gpio_enable is called, so this must be called after calling that function.
*/
static inline void gpio_set_output_on_sleep(const uint8_t gpio_num, bool enabled)
{
if (enabled) {
IOMUX.PIN[gpio_to_iomux(gpio_num)] |= IOMUX_PIN_OUTPUT_ENABLE_SLEEP;
} else {
IOMUX.PIN[gpio_to_iomux(gpio_num)] &= ~IOMUX_PIN_OUTPUT_ENABLE_SLEEP;
}
}
/* Set output of a pin high or low.
*
* Only works if pin has been set to GPIO_OUTPUT via gpio_enable()