我在以ISR(中断模式)执行深度睡眠和i2c通信时遇到问题。
我正在使用此库在Arduino IDE中对其进行编码:
https://github.com/espressif/arduino-esp32
https://techtutorialsx.com/2017/09/30/esp32-arduino-external-interrupts/
当我在void loop()函数中运行i2c时,它对i2c正常工作(例如打开LED),但是当我移植它以中断它时,则不起作用。
与深度睡眠相同,我无法在中断模式下执行它。解决方法是在中断模式下设置一个标志,以表明我想进入深度睡眠状态,然后在void loop()函数中执行该标志。
有人如何解决这项工作吗? (代码仅适用于i2c和esp32)
#include <Wire.h>
#if defined(ARDUINO_ARCH_SAMD)
// for Zero, output on USB Serial console, remove line below if using programming port to program the Zero!
#define Serial SerialUSB
#endif
// Interrupt Setup - TIMER
hw_timer_t * timer = NULL; //configure the timer, need pointer to a variable type of hw_timer_t
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED; // used to sync main loop and ISR
RTC_DATA_ATTR bool should_sleep = false;
// Setting ADC Properties - BATTERY
int voltage_amplifier = 0;
int battery_percentage = 0;
// Set i2c Address - I/O EXPANDER
const int address = 0x20;
uint16_t led_status = word(B11111111,B11111111);
// INTERRUPT MODE - INSERT INBETWEEN portENTER and portEXIT
void IRAM_ATTR onTimer() {
portENTER_CRITICAL_ISR(&timerMux);
// led_battery(); led doesn't update if used here
portEXIT_CRITICAL_ISR(&timerMux);
}
void led_battery(){
voltage_amplifier = analogRead(34);
Serial.println(voltage_amplifier);
int bit_max = 4096;
int battery_percentage = voltage_amplifier*100/bit_max;
// If battery is below 20%
if (battery_percentage <= 20){
led_status &= word(B00111111,B11111111); // clearing the bits that we want to change whilst preserving the other unchanged bits
led_status |= ~word(B11000000,B00000000); // setting up the bits that we want to change
pf575_write(led_status);
}
else if (battery_percentage <= 40){
led_status &= word(B00011111,B11111111); // clearing the bits that we want to change whilst preserving the other unchanged bits
led_status |= ~word(B11100000,B00000000); // setting up the bits that we want to change
pf575_write(led_status);
}
else if (battery_percentage <= 60){
led_status &= word(B00001111,B11111111); // clearing the bits that we want to change whilst preserving the other unchanged bits
led_status |= ~word(B11110000,B00000000); // setting up the bits that we want to change
pf575_write(led_status);
}
else if (battery_percentage <= 80){
led_status &= word(B00000111,B11111111); // clearing the bits that we want to change whilst preserving the other unchanged bits
led_status |= ~word(B11111000,B00000000); // setting up the bits that we want to change
pf575_write(led_status);
}
else if (battery_percentage <= 100){
led_status &= word(B00000011,B11111111); // clearing the bits that we want to change whilst preserving the other unchanged bits
led_status |= ~word(B11111100,B00000000); // setting up the bits that we want to change
pf575_write(led_status);
}
}
void ioexpander_setup(){
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\n Blinker Ready");
Wire.begin();
}
void pf575_write(uint16_t data) {
Wire.beginTransmission(address);
Wire.write(lowByte(data));
Wire.write(highByte(data));
Wire.endTransmission();
}
void timer_setup(){
// Base Clock Frequency = 80MHz ; Timer Frequency = 1MHz | Clock Cycle = 1us [in this case]
timer = timerBegin(0,80,true); // return a pointer to a structure of type hw_timer_t
// Timer binded to a handling function
timerAttachInterrupt(timer, &onTimer, true); // Parameter : (timer_initialization, address_interrupt,flag_to_activate - true(edge)/false(level))
// Specify the counter value in which the timer interrupt will be generated (set every 10 ms)
timerAlarmWrite(timer, 10000, true); // Parameter : (timer_initialization, when_to_interrupt (us), flag_to_reload)
// Enable the timer
timerAlarmEnable(timer);
}
void setup() {
Serial.begin(115200);
// IO Expander
ioexpander_setup();
// Timer
timer_setup();
}
void loop() {
led_battery(); //led update if used here
}
答案 0 :(得分:0)
当您从中断处理程序中调用led_battery()
时,您在这里做了很多工作。
该中断可以中断所有没有锁定的中断。
假设您的代码正在使用Serial输出某些内容,并且发生了计时器中断。现在您的代码正在Serial内的某个地方运行代码,并且您再次调用Serial ...而软硬件可能处于不一致状态。
从中断处理程序执行的每个子例程和硬件访问都是这种情况。防止这种情况的唯一方法是,只要您的代码可能正在访问硬件或可能已经修改了数据结构,就禁用中断。
不幸的是,禁用中断很容易出错-如果您忘记这样做,将会遇到神秘的崩溃。如果您忘记重新启用它们,则会遇到大麻烦-网络,计时器和串行端口都将停止工作。这也增加了代码的开销。而且它会降低整体系统性能-会延迟或导致您错过网络和计时器事件。您可以从串行端口删除字符。您可以确定Arduino Core中没有代码为您这样做。
因此,长话短说,锁定中断以使您可以在中断处理程序中做很多事情只是不切实际。
您还希望尽量减少在中断处理程序上花费的时间,因为这会抢占网络堆栈,计时器,串行和其他硬件处理,并且可能会阻塞其他
您在原始帖子中指出了我们的处理方式:在中断处理程序中设置一个标志(确保它为volatile
)并在任务中处理它。除非您真的非常了解自己在做什么以及系统中所有软件的工作方式,否则这是处理此问题的唯一实用方法。如果您尝试执行大量工作并从中断处理程序中调用要调用的内容,则程序将发生故障并崩溃。