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Atmega328p8/10/2023 ![]() To configure the timer 1 in normal modes, all the wave generation bits(WGM13,WGM12,WGM11,WGM10) are set to LOW. The input capture mode works on using the Normal mode. The next statements are used to configure the Timer 1 input capture mode as well as pre-scalar. Then we also enable the internal pullup of the input capture pin PB0. In the main function we have setup the LED pin as output and the input capture pin PB0 as input(which is optional). Next we have the define statement where we give alias to the LED connected port pin. If you want to create your own delay function using either timer 0, timer 1 or timer 2 then see the tutorials Time delay using timer 0 without inbuild functions in Arduino, Time Delay with Arduino Timer 1 or Time Delay with Arduino Timer 2. The delay.h header file is used because we use the delay function _delay_ms() function to create delay of one second down later in the program. In the code above, we have to include interrupt.h header file because we are using the interrupt subroutine which is defined in that header file. TIMSK1 |= (1<<ICIE1) //enable input capture interrupt Timer 1 config: no noise canceller, rising edge, normal mode, no prescalar PORTB |= (1<<PB0) //activate input capture pin internal pullup The following is the C program code for this input capture with interrupt example.ĭDRB |= LED //configure LED pin as outputĭDRB &= ~(1<<PB0) //configure input capture pin as input The following circuit diagram shows how this input capture application works. Due to this interrupt the LED is turned on for one second. When the switch is pressed, the input capture hardware detects this and an interrupt is generated. A LED is connected to some pin like pin 15(PB1 pin) here. This is continuation of that tutorial which explains how to use and program ATmega328P with input capture using interrupt.įor input capture demonstration purpose we connect a switch to the input capture pin 14(PB0) of ATmega328P. The operation of polling method was explained in details with code example in the previous tutorial Programming ATmega328p Input Capture. The input capture feature of ATmega328P can be operated in polling method and in interrupt method. Example of such events includes capturing the time period of an incoming signal, duty cycle and frequency of the incoming signal. That is the time stamp of occurrence of such events can be captured. I have ordered some more chips and I am going to have a another go.AVR microcontroller such as ATmega328P can be used to capture external events using the input capture feature. ![]() I have included the schematic just in case I have done somthing stupid, this which works fine with the ATMEGA328P-PU all I have done is substituted the micro controller for the SMD version ATMEGA328P-AU. PU and AU markings refer to package type only right? Thats what I make from the datasheet. Is there any difference between these two chips apart from the package? I have treated them the same but I must be doing something wrong. Is there anything thay I must consider when using the SMD version? I have looked at the Arduino UNO smd schematic and I think that my schematic is right. I have fried two chips already (not fun as they are SMD) and Google’d quite a lot but not had much luck. I am using a Olimex AVR-ISP500 programmer. It’s like the chip accepts a write to the flash but it does not actually write the flash or anything! I have tried AVR studio 4 and AVR dude and get the same results. It seems to let me write to the flash but then fails on a verify. All fuses read 0x00 and so does the chip signature! (I must have damaged it) My problem is that when I change the micro controller to an ATMEGA328P-AU (SMD version) I am unable program the chip! It lets me read the fuses initially (I get extended 0xFF, high 0xD9 and low 0圆2 (default) no problem but as soon as I try to change them I get an error.Īfter this error I am not able to do much with the chip. I am not using a boot loader as I am programming via the ISP. I have been programming the HEX files generated by Arduino software version 22 directly to the chip. I have made a project on a breadboard using ATMEGA328P-PU (standard Arduino Uno chip) which all works fine.
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