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141 lines
4.2 KiB
141 lines
4.2 KiB
/******************************************************************************
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* Copyright 2013-2014 Espressif Systems (Wuxi)
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*
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* FileName: hw_timer.c
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*
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* Description: hw_timer driver
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*
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* Modification history:
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* 2014/5/1, v1.0 create this file.
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*******************************************************************************/
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#include "ets_sys.h"
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#include "os_type.h"
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#include "osapi.h"
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#define US_TO_RTC_TIMER_TICKS(t) \
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((t) ? \
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(((t) > 0x35A) ? \
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(((t)>>2) * ((APB_CLK_FREQ>>4)/250000) + ((t)&0x3) * ((APB_CLK_FREQ>>4)/1000000)) : \
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(((t) *(APB_CLK_FREQ>>4)) / 1000000)) : \
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0)
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#define FRC1_ENABLE_TIMER BIT7
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#define FRC1_AUTO_LOAD BIT6
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//TIMER PREDIVED MODE
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typedef enum {
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DIVDED_BY_1 = 0, //timer clock
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DIVDED_BY_16 = 4, //divided by 16
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DIVDED_BY_256 = 8, //divided by 256
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} TIMER_PREDIVED_MODE;
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typedef enum { //timer interrupt mode
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TM_LEVEL_INT = 1, // level interrupt
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TM_EDGE_INT = 0, //edge interrupt
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} TIMER_INT_MODE;
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typedef enum {
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FRC1_SOURCE = 0,
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NMI_SOURCE = 1,
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} FRC1_TIMER_SOURCE_TYPE;
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/******************************************************************************
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* FunctionName : hw_timer_arm
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* Description : set a trigger timer delay for this timer.
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* Parameters : uint32 val :
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in autoload mode
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50 ~ 0x7fffff; for FRC1 source.
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100 ~ 0x7fffff; for NMI source.
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in non autoload mode:
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10 ~ 0x7fffff;
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* Returns : NONE
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*******************************************************************************/
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void hw_timer_arm(u32 val)
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{
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RTC_REG_WRITE(FRC1_LOAD_ADDRESS, US_TO_RTC_TIMER_TICKS(val));
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}
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static void (* user_hw_timer_cb)(void) = NULL;
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/******************************************************************************
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* FunctionName : hw_timer_set_func
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* Description : set the func, when trigger timer is up.
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* Parameters : void (* user_hw_timer_cb_set)(void):
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timer callback function,
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* Returns : NONE
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*******************************************************************************/
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void hw_timer_set_func(void (* user_hw_timer_cb_set)(void))
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{
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user_hw_timer_cb = user_hw_timer_cb_set;
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}
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static void hw_timer_isr_cb(void)
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{
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if (user_hw_timer_cb != NULL) {
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(*(user_hw_timer_cb))();
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}
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}
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/******************************************************************************
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* FunctionName : hw_timer_init
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* Description : initilize the hardware isr timer
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* Parameters :
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FRC1_TIMER_SOURCE_TYPE source_type:
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FRC1_SOURCE, timer use frc1 isr as isr source.
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NMI_SOURCE, timer use nmi isr as isr source.
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u8 req:
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0, not autoload,
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1, autoload mode,
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* Returns : NONE
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*******************************************************************************/
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void ICACHE_FLASH_ATTR hw_timer_init(FRC1_TIMER_SOURCE_TYPE source_type, u8 req)
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{
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if (req == 1) {
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RTC_REG_WRITE(FRC1_CTRL_ADDRESS,
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FRC1_AUTO_LOAD | DIVDED_BY_16 | FRC1_ENABLE_TIMER | TM_EDGE_INT);
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} else {
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RTC_REG_WRITE(FRC1_CTRL_ADDRESS,
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DIVDED_BY_16 | FRC1_ENABLE_TIMER | TM_EDGE_INT);
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}
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if (source_type == NMI_SOURCE) {
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ETS_FRC_TIMER1_NMI_INTR_ATTACH(hw_timer_isr_cb);
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} else {
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ETS_FRC_TIMER1_INTR_ATTACH(hw_timer_isr_cb, NULL);
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}
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TM1_EDGE_INT_ENABLE();
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ETS_FRC1_INTR_ENABLE();
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}
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//-------------------------------Test Code Below--------------------------------------
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#if 0
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void hw_test_timer_cb(void)
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{
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static uint16 j = 0;
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j++;
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if ((WDEV_NOW() - tick_now2) >= 1000000) {
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static u32 idx = 1;
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tick_now2 = WDEV_NOW();
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os_printf("b%u:%d\n", idx++, j);
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j = 0;
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}
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//hw_timer_arm(50);
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}
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void ICACHE_FLASH_ATTR user_init(void)
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{
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hw_timer_init(FRC1_SOURCE, 1);
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hw_timer_set_func(hw_test_timer_cb);
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hw_timer_arm(100);
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}
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#endif
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/*
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NOTE:
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1 if use nmi source, for autoload timer , the timer setting val can't be less than 100.
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2 if use nmi source, this timer has highest priority, can interrupt other isr.
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3 if use frc1 source, this timer can't interrupt other isr.
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*/
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