Arduino Atmega8 16位计数器的读取总是返回8位值
我试图读取Atmega8的16位计数器,但输出永远不会>255。Atmega8配置为Arduino。我知道它必须一次读8位,但它似乎不起作用。查看readconder()函数中的代码,以及Serial.println的输出Arduino Atmega8 16位计数器的读取总是返回8位值,arduino,avr,Arduino,Avr,我试图读取Atmega8的16位计数器,但输出永远不会>255。Atmega8配置为Arduino。我知道它必须一次读8位,但它似乎不起作用。查看readconder()函数中的代码,以及Serial.println的输出 #include <Arduino.h> #include <avr/io.h> #include <string.h> #define IN_BUF_LEN 65 #define OUT_BUF_LEN 128 // Pin 13 h
#include <Arduino.h>
#include <avr/io.h>
#include <string.h>
#define IN_BUF_LEN 65
#define OUT_BUF_LEN 128
// Pin 13 has an LED connected
int pinLed = 13;
char cmdBuf[IN_BUF_LEN];
char outBuf[128];
char *token;
void readCounter(){
uint8_t count1, count2;
uint16_t count;
/* Disable interrupts */
noInterrupts();
count = TCNT1;
count1 = TCNT1H;
count2 = TCNT1L;
// enable interrupts
interrupts();
snprintf(outBuf, OUT_BUF_LEN, "Count:%d, %d, %d", count,count1,count2);
Serial.println(outBuf);
}
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(pinLed, OUTPUT);
Serial.begin(19200);
// Turn on the counter, Clock on Rise
TCCR1B |= (1 << CS12) | (1 << CS11) | (1 << CS10);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(pinLed, HIGH);
delay(50);
digitalWrite(pinLed, LOW);
int bytesRead = Serial.readBytesUntil(10, cmdBuf, IN_BUF_LEN - 1);
cmdBuf[bytesRead] = 0;
if (bytesRead > 0){
token = strtok(cmdBuf, " ");
if(!strcasecmp(token, "readCounter")){
readCounter();
}
}
}
验证
TCCR1A
和TCCR1B
的值,以确保计时器1未处于8位模式,如8位PWM或CTC,其最大值小于256。TCCR1A和TCCR1B
包含什么?TCCR1B是十进制7,因为它是在setup()函数中设置的。但是TCCR1A我没有设置任何值,它是1。意味着计数器1被配置为8位PWM。将其设置为0解决了我的问题。谢谢@Ignacio
Count:30, 0, 30
Count:130, 0, 130
Count:250, 0, 250
Count:236, 0, 236
Count:72, 0, 72