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

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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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core/esp_gpio_interrupts.c Normal file
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/* ESP GPIO interrupts.
Use with gpio_set_interrupt(), defined in esp/gpio.h
These interrupt vectors are default implementations with weak
linkage. Override your own GPIO interrupt vectors in your program
and they will replace these.
Look in examples/button/ for a simple GPIO interrupt example.
You can implement your own interrupts in two ways:
- Implement gpXX_interrupt_handler() for the GPIO pin numbers that you want to attach interrupts to. This is simple but it may not be enough sometimes
- Implement a single gpio_interrupt_handler() and manually check GPIO_STATUS_REG
and clear any status bits after handling interrupts. This gives
you full control.
*/
#include "esp8266.h"
void gpio_interrupt_handler(void);
void gpio_noop_interrupt_handler(void) { }
void gpio00_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio01_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio02_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio03_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio04_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio05_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio06_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio07_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio08_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio09_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio10_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio11_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio12_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio13_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio14_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
void gpio15_interrupt_handler(void) __attribute__((weak, alias("gpio_noop_interrupt_handler")));
typedef void (* gpio_interrupt_handler_t)(void);
const gpio_interrupt_handler_t gpio_interrupt_handlers[16] = {
gpio00_interrupt_handler, gpio01_interrupt_handler, gpio02_interrupt_handler,
gpio03_interrupt_handler, gpio04_interrupt_handler, gpio05_interrupt_handler,
gpio06_interrupt_handler, gpio07_interrupt_handler, gpio08_interrupt_handler,
gpio09_interrupt_handler, gpio10_interrupt_handler, gpio11_interrupt_handler,
gpio12_interrupt_handler, gpio13_interrupt_handler, gpio14_interrupt_handler,
gpio15_interrupt_handler };
void __attribute__((weak)) IRAM gpio_interrupt_handler(void)
{
uint32_t status_reg = GPIO_STATUS_REG;
GPIO_STATUS_CLEAR = status_reg;
uint8_t gpio_idx;
while((gpio_idx = __builtin_ffs(status_reg)))
{
gpio_idx--;
status_reg &= ~BIT(gpio_idx);
if(GPIO_CTRL_REG(gpio_idx) & GPIO_INT_MASK)
gpio_interrupt_handlers[gpio_idx]();
}
}