TCD0.CMPASET = 2536 /* Compare A Set: 2536 */TCD0.CMPACLR = 2760 /* Compare A Clear: 2760 */TCD0.CMPBSET = 3277 /* Compare B Set: 3277 */TCD0.CMPBCLR = 4092 /* Compare B Clear: 4092 */Īfter the second pulse ends (Compare B clear) the timer will start over again which will result in the following two pulses:
I will explain a little later why we cannot use 4095 to end the second pulse. The first pulse starts at 2536 and ends at 2760 while the second starts at 3277 and ends at 4092. The TCD0 timer is 12 bits, so we create two pulses between 0 to 4095. TCD0.CTRLB = 0x00 /* Disable Dual slope mode */įor the two pulses we have to define a duration. Changing the TCD0 back to One Ramp Mode is done as follows: The ATtiny Arduino core is using Dual Slope Mode to control the PWM output pins PC0 and PC1. Compare value A can be used to create an output on WOA, while value B is used for WOB. See page#273 of the ATtiny1616 datasheet for more information. TCD0 in One Ramp Mode is excellent to create these two pulses since it allows two different compare values on a single cycle. The first timer is used to create the two pulses for the heartbeat where the second pulse is slightly stronger and longer, just like a real heartbeat. In this case we are going to use CCL1 and that output is on PA7 (see diagram above). The “Realistic Heartbeat” example uses two timers to create a pulsing output on the CCL output pin which can be shown with an LED.
#Attiny usi uart code#
Using the same code in Arduino will not work since some of the timers are configured differently.
#Attiny usi uart download#
You can download the code and use Atmel Studio to execute the code. Tabs on the left will give you the options to get a flow-chart of the timers and CCL used. Just search for “Realistic Heartbeat tiny817” and open the selected example. The original code can be found on Atmel Start: This log will describe the “Realistic Heartbeat tiny817” example from Atmel Start and how this can be used on the ATtiny1616 which is compiled with Arduino. Unfortunately, I had a hard time understanding the code and the code would not work out of the box within the Arduino ATtiny core. See a complete overview on page#452 of the ATtiny1616 datasheet.Ītmel Start has a great example of using timers with CCL to control an LED on the output pin.
#Attiny usi uart serial#
Serial communication like USART and SPI.Input pins is not the only input source for the CCL, but the following options are available as well: Above you can see PA0, PA1 and PA2 can be used as inputs for CCL0 to control the output on PA4. Up to 3 different inputs can be combined to trigger an output. See below diagram of the ATtiny1616 with the CCL pins in yellow: Dedicated inputs can be combined to trigger predefined output pins. The simplest examples of using CCL is by using the I/O pins. Using this option can eliminate the need of flip-flops to control some basic operations. CCL allows you to combine some inputs to create an output that runs totally independent of the MCU.
#Attiny usi uart series#
Throughout different logs different challenges will be explained and resolved.Ī regular Arduino UNO can be used to program the ATtiny1616:Ī new feature, not seen on the ATtiny series before, is Configurable Custom Logic (CCL). This project will document the development of the Arduino Core for the tinyAVR 1-series and a breakout board for the ATtiny1616. There is no Arduino support (yet) and there is no DIP version to plug into a breadboard. Looks like it has all the benefits from the ATtiny84a, same foot print, same power specifications, and some great additional features as well as you can see in the table below:Īble to run this from the 20 MHz internal oscillator, twice as much flash and four times more SRAM (compared to the ATtiny84) and support of most common peripherals excites me! There are just some minor problems.
Out of this new offering the ATtiny1616 draw my attention. The Arduino Core is ready! Find the core on:ĪTMEL was acquired by Microchip Technology in 2016 and last year they came out with a new microcontroller family sharing their technology, the tinyAVR and megaAVR.
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