core_esp8266_timer.c

/*
  timer.c - Timer1 library for esp8266
*/
#include "wiring_private.h"
#include "pins_arduino.h"

#include "c_types.h"
#include "ets_sys.h"

// ------------------------------------------------------------------ -
// timer 1

static volatile timercallback timer1_user_cb = NULL;

void ICACHE_RAM_ATTR timer1_isr_handler(void *para) {
  (void) para;
  if ((T1C & ((1 << TCAR) | (1 << TCIT))) == 0) TEIE &= ~TEIE1;//edge int disable
  T1I = 0;
  if (timer1_user_cb) {
    // to make ISR compatible to Arduino AVR model where interrupts are disabled
    // we disable them before we call the client ISR
    uint32_t savedPS = xt_rsil(15); // stop other interrupts
    timer1_user_cb();
    xt_wsr_ps(savedPS);
  }
}

void ICACHE_RAM_ATTR timer1_isr_init() {
  ETS_FRC_TIMER1_INTR_ATTACH(timer1_isr_handler, NULL);
}

void timer1_attachInterrupt(timercallback userFunc) {
  timer1_user_cb = userFunc;
  ETS_FRC1_INTR_ENABLE();
}

void ICACHE_RAM_ATTR timer1_detachInterrupt() {
  timer1_user_cb = 0;
  TEIE &= ~TEIE1;//edge int disable
  ETS_FRC1_INTR_DISABLE();
}

void timer1_enable(uint8_t divider, uint8_t int_type, uint8_t reload) {
  T1C = (1 << TCTE) | ((divider & 3) << TCPD) | ((int_type & 1) << TCIT) | ((reload & 1) << TCAR);
  T1I = 0;
}

void ICACHE_RAM_ATTR timer1_write(uint32_t ticks) {
  T1L = ((ticks) & 0x7FFFFF);
  if ((T1C & (1 << TCIT)) == 0) TEIE |= TEIE1;//edge int enable
}

void ICACHE_RAM_ATTR timer1_disable() {
  T1C = 0;
  T1I = 0;
}

//-------------------------------------------------------------------
// timer 0

static volatile timercallback timer0_user_cb = NULL;

void ICACHE_RAM_ATTR timer0_isr_handler(void* para) {
  (void) para;
  if (timer0_user_cb) {
    // to make ISR compatible to Arduino AVR model where interrupts are disabled
    // we disable them before we call the client ISR
    uint32_t savedPS = xt_rsil(15); // stop other interrupts
    timer0_user_cb();
    xt_wsr_ps(savedPS);
  }
}

void timer0_isr_init() {
  ETS_CCOMPARE0_INTR_ATTACH(timer0_isr_handler, NULL);
}

void timer0_attachInterrupt(timercallback userFunc) {
  timer0_user_cb = userFunc;
  ETS_CCOMPARE0_ENABLE();
}

void ICACHE_RAM_ATTR timer0_detachInterrupt() {
  timer0_user_cb = NULL;
  ETS_CCOMPARE0_DISABLE();
}