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xtensa/esp32: Enable configuration of GPIO pad's drive strength

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Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
This commit is contained in:
Gustavo Henrique Nihei 2021-07-23 09:18:53 -03:00 committed by Xiang Xiao
parent e98220c81a
commit 2d676f5e46
2 changed files with 51 additions and 8 deletions
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39
arch/xtensa/src/esp32/esp32_gpio.c
View File

@ -163,6 +163,18 @@ static int gpio_interrupt(int irq, FAR void *context, FAR void *arg)
* Description:
* Configure a GPIO pin based on encoded pin attributes.
*
* Input Parameters:
* pin - GPIO pin to be configured
* attr - Attributes to be configured for the selected GPIO pin.
* The following attributes are accepted:
* - Direction (OUTPUT or INPUT)
* - Pull (PULLUP, PULLDOWN or OPENDRAIN)
* - Function (if not provided, assume function GPIO by default)
* - Drive strength (if not provided, assume DRIVE_2 by default)
*
* Returned Value:
* Zero (OK) on success, or -1 (ERROR) in case of failure.
*
****************************************************************************/
int esp32_configgpio(int pin, gpio_pinattr_t attr)
@ -281,23 +293,34 @@ int esp32_configgpio(int pin, gpio_pinattr_t attr)
}
}
/* Add drivers */
func |= (uint32_t)(2ul << FUN_DRV_S);
/* Select the pad's function. If no function was given, consider it a
* normal input or output (i.e. function3).
*/
/* Configure the pad's function */
if ((attr & FUNCTION_MASK) != 0)
{
func |= (uint32_t)(((attr >> FUNCTION_SHIFT) - 1) << MCU_SEL_S);
uint32_t val = ((attr & FUNCTION_MASK) >> FUNCTION_SHIFT) - 1;
func |= val << MCU_SEL_S;
}
else
{
/* Function not provided, assuming function GPIO by default */
func |= (uint32_t)(PIN_FUNC_GPIO << MCU_SEL_S);
}
/* Configure the pad's drive strength */
if ((attr & DRIVE_MASK) != 0)
{
uint32_t val = ((attr & DRIVE_MASK) >> DRIVE_SHIFT) - 1;
func |= val << FUN_DRV_S;
}
else
{
/* Drive strength not provided, assuming strength 2 by default */
func |= UINT32_C(2) << FUN_DRV_S;
}
if ((attr & OPEN_DRAIN) != 0)
{
cntrl |= (1 << GPIO_PIN_PAD_DRIVER_S);

20
arch/xtensa/src/esp32/esp32_gpio.h
View File

@ -56,6 +56,7 @@
#define PULLUP (1 << 3)
#define PULLDOWN (1 << 4)
#define OPEN_DRAIN (1 << 5)
#define FUNCTION_SHIFT 6
#define FUNCTION_MASK (7 << FUNCTION_SHIFT)
# define FUNCTION_1 (1 << FUNCTION_SHIFT)
@ -65,6 +66,13 @@
# define FUNCTION_5 (5 << FUNCTION_SHIFT)
# define FUNCTION_6 (6 << FUNCTION_SHIFT)
#define DRIVE_SHIFT 9
#define DRIVE_MASK (7 << DRIVE_SHIFT)
# define DRIVE_0 (1 << DRIVE_SHIFT)
# define DRIVE_1 (2 << DRIVE_SHIFT)
# define DRIVE_2 (3 << DRIVE_SHIFT)
# define DRIVE_3 (4 << DRIVE_SHIFT)
#define INPUT_PULLUP (INPUT | PULLUP)
#define INPUT_PULLDOWN (INPUT | PULLDOWN)
#define OUTPUT_OPEN_DRAIN (OUTPUT | OPEN_DRAIN)
@ -147,6 +155,18 @@ void esp32_gpioirqinitialize(void);
* Description:
* Configure a GPIO pin based on encoded pin attributes.
*
* Input Parameters:
* pin - GPIO pin to be configured
* attr - Attributes to be configured for the selected GPIO pin.
* The following attributes are accepted:
* - Direction (OUTPUT or INPUT)
* - Pull (PULLUP, PULLDOWN or OPENDRAIN)
* - Function (if not provided, assume function GPIO by default)
* - Drive strength (if not provided, assume DRIVE_2 by default)
*
* Returned Value:
* Zero (OK) on success, or -1 (ERROR) in case of failure.
*
****************************************************************************/
int esp32_configgpio(int pin, gpio_pinattr_t attr);