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Add GPIO config, interrupt registers, GPIO interrupt support, 'button' example

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This commit is contained in:
Angus Gratton 2015-06-08 18:09:06 +10:00
parent 822533fd92
commit 0078252df3
7 changed files with 377 additions and 16 deletions
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54
core/include/esp/gpio.h
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@ -10,11 +10,14 @@
#include <stdbool.h>
#include "esp/registers.h"
#include "esp/iomux.h"
#include "esp/cpu.h"
#include "xtensa_interrupts.h"
typedef enum {
GPIO_INPUT = 0,
GPIO_OUTPUT = IOMUX_OE,
GPIO_INPUT_PULLUP = IOMUX_PU,
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
@ -22,7 +25,28 @@ typedef enum {
*/
INLINED void gpio_enable(const uint8_t gpio_num, const gpio_direction_t direction)
{
iomux_set_gpio_function(gpio_num, (uint8_t)direction);
uint32_t iomux_flags;
uint32_t ctrl_val;
switch(direction) {
case GPIO_INPUT:
iomux_flags = 0;
ctrl_val = GPIO_SOURCE_GPIO;
break;
case GPIO_OUTPUT:
iomux_flags = IOMUX_OE;
ctrl_val = GPIO_DRIVE_PUSH_PULL|GPIO_SOURCE_GPIO;
break;
case GPIO_OUT_OPEN_DRAIN:
iomux_flags = IOMUX_OE;
ctrl_val = GPIO_DRIVE_OPEN_DRAIN|GPIO_SOURCE_GPIO;
break;
case GPIO_INPUT_PULLUP:
iomux_flags = IOMUX_PU;
ctrl_val = GPIO_SOURCE_GPIO;
}
iomux_set_gpio_function(gpio_num, iomux_flags);
GPIO_CTRL_REG(gpio_num) = (GPIO_CTRL_REG(gpio_num)&GPIO_INT_MASK) | ctrl_val;
if(direction == GPIO_OUTPUT)
GPIO_DIR_SET = BIT(gpio_num);
else
@ -80,5 +104,27 @@ INLINED bool gpio_read(const uint8_t gpio_num)
return GPIO_IN_REG & BIT(gpio_num);
}
typedef enum {
INT_NONE = 0,
INT_RISING = GPIO_INT_RISING,
INT_FALLING = GPIO_INT_FALLING,
INT_CHANGE = GPIO_INT_CHANGE,
INT_LOW = GPIO_INT_LOW,
INT_HIGH = GPIO_INT_HIGH,
} gpio_interrupt_t;
extern void gpio_interrupt_handler(void);
/* Set the interrupt type for a given pin
*/
INLINED void gpio_set_interrupt(const uint8_t gpio_num, const gpio_interrupt_t int_type)
{
GPIO_CTRL_REG(gpio_num) = (GPIO_CTRL_REG(gpio_num)&~GPIO_INT_MASK)
| (int_type & GPIO_INT_MASK);
if(int_type != INT_NONE) {
_xt_isr_attach(INUM_GPIO, gpio_interrupt_handler);
_xt_isr_unmask(1<<INUM_GPIO);
}
}
#endif