Note that all capacitors in the schema are nF. First I set the SS line to low, then send the command 0x9Fthen read 3 bytes by sending 0xff dummy data and finally pulling the SS line to high again.
I suspect something is wrong with my SPI connection. Also my code correctly decodes the pattern on the MISO line as 0x7c 0x20 0x6f. You can find the Oscilloscope readings below.
Furthermore I tried to read the status and configuration with the 0x05 respectively 0x35 commands. However, both of them return just 0x According to the datasheet at least the configuration register should contain a 1 in factory settings at the 3rd bit. SCK and SS. I'm now at a point where I can't think of anything else to do to try and debug this issue.
I would be very helpful to any help you can provide! This is the first time I'm using SPI and it is very hard for me to debug hardware as I have a software background. I double checked everything today and everything looks correct to me. As mentioned in the comments below, it is a repeating byte sequence:. As I had the same chip in the 16 pin housing I quickly soldered a breakout board together and replaced the chip.
Surprisingly I get exactly the same behavior. I definitely think there's something wrong the way I do it, but I don't yet see how As I already mentioned in the comments, I managed to get the Memory chip working in with an Arduino.
So I investigated further. And guess what: It worked out of the box. So there must be something wrong with the ATMega I'm using. And this works as well. I'll try to get my hands on another ATMega and try with that one. My guess is that I broke something in the ATMega When I touch these cables, the communication works. When I don't touch them it does not work. I suspect there's something floating. I don't have the tools at hand at the moment. The underlying problem had nothing to do with software or the chips not working properly.
I was using 20cm ribbon cables to connect the ATMega to the external board containing the memory chip. Separating the cables and spreading them a little bit solved the issues. I probably had crosstalk between the signals.I have recently been playing with the ATMegaP currently on breadboard with all the usual support circuity and a regulated 5v and 3v power supply. I am about to play with raw AVR programming but that is another story.
My problem I hope is simple. However, if I change the crystal to 20MHz then the delay function is no longer accurate. What should be a second delay is actually a little shorter, not sure how much shorter but it is noticeable. They of course go out of sync quickly. I further tested by placing a 16MHz crystal on my ATMegap and they blinked perfectly in sequence. Is there a parameter somewhere that I can use to make sure that the delay function works correctly?
I hope somebody is able to shed some light on this problem because my application is fairly time sensitive. Is it OK for them to share the same reset button? Is the delay function the only thing I need to consider? Make sure you set the oscillator for full-swing unless you have a very good reason not to.
The P has an issue with the low power mode if your PCB layout isn't tip-top. Read AVR Skip to main content. Log in or register to post comments.
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ATMega1284P Guitar and Music Effects Pedal
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It also has the advantage that it's available in a DIP package, so it fits on a prototyping board and is easy to wire up, and is nearly half the price of the ATmega Surprisingly there isn't currently an official Arduino board based on it. This will add two new options to the Boards menu, for an ATmega with the default 1 MHz internal oscillator, or with an 8 MHz internal oscillator.
Alternatively you can use another suitable ISP programmer, such as an Arduino Uno as described in Installing a bootloader below. Then upload the program again and the Blink program should flash eight times faster. Install the mightyp folder in the hardware folder in your Arduino folder and restart the Arduino IDE.
This should add a Mightyp Boards section at the bottom of your Boards submenu with several alternative board definitions. If you want to program the ATmegaP via the serial port, and use the Serial Monitor for debugging, you will need a bootloader.
You can either buy an ATmegaP chip with a bootloader already installed, or install a bootloader yourself using ISP as described in the next section. Previous: Digital Clock Using Lisp. Technoblogy Arduino and AVR projects. Portable Lab Power Supply.
Illuminated Button Matrix. New ATtiny Low Power. Mega Tiny Time Watch. Minimal ATmega on a Breadboard. Using an ATmega core. Using a bootloader. Add the following sections to the boards.
Using a bootloader If you want to program the ATmegaP via the serial port, and use the Serial Monitor for debugging, you will need a bootloader. Now proceed as follows: Install the Mighty P core.
Update 3rd October Added the Reset connection, which I'd missed from the circuit diagram of programming an ATmega using an Arduino.An additional unexpected benefit is that the Mega build has a much lower noise component - to the extent that when I compare the Uno and the Mega using the same support circuitry it is not unreasonable to describe the Uno as "noisy" and the Mega as "quiet".
The larger RAM means that a much longer delay effect can be obtained - and that is demonstrated by the Arduino sketch example that I have included. The background breathing noise when using the Tremelo effect is also almost absent with the ATMega As a result I ended up with a circuit which I considered to give acceptable results.
The details of this Uno version are given in appendix 2. I later discovered the excellent modifications to the electrosmash circuit by Paul Gallagher and after testing, this is the circuit I will present here - but then also with modifications: substitution of the Uno with the Mega, using a Texas Instruments TLC as the OpAmp, and because of the excellent noise performance of the Mega, I could also raise the low-pass filter frequency level.
Details and links for this process are given in appendix 1. Schematic 1 gives the circuit used and Breadboard 1 is its physical representation Fritzing 1 with Photo 1 the actual bread-boarded circuit in operation. It may be advantageous to have a potentiometer as a mixer for the dry equal to the input and the wet after processing by the MCU signal, and Schematic 2, Breadboard 2 and Photo 2 listed in Appendix 2gives the circuit details of a previously constructed circuit which incorporates such an input to output mixer.
The parts list contains a number of alternative OpAmp types. The k potentiometer is used to adjust the input gain to a level just below any distortion, and it can also be used to adjust the input sensitivity for an input source other than a guitar such as a music player. The two PWM outputs on PD4 and PD5 are set as the high and low bytes of the audio output and mixed with the two resistors 4k7 and 1M2 in a ratio low byte and high byte - which generates the audio output.
It may be worthwhile experimenting with other resistor pairs such as the 3k9 1M ohm pair used by Open Music Labs in their StompBox. The software is based on the electrosmash sketches, and the example included pedalshielddelay. Other examples such as the octaver or tremolo from the electrosmash website for the pedalSHIELD Uno can be adapted for use by the Mega by changing three sections in the code:.
The pushbuttons 1 and 2 are used in some of the sketches to increase or decrease an effect. In the delay example it increases or decreases the delay time. When the sketch is first loaded it starts with the maximum delay effect. Listen how the sweep effect of holding in the button changes the effect to that of a phaser, chorus and flanging, as well as the delay when the button is released.
The footswitch should be a three pole two way switch and must be connected as described on the electrosmash website. Schematic3, Breadboard3, and Photo3 gives details of the Uno-based circuit that preceded the AtMega build.
It may be advantageous to have a potentiometer as a mixer for the dry equal to the input and the wet after processing by the MCU signal, and Schematic 2, Breadboard 2 and Photo 2 gives the circuit details of a previously constructed circuit which incorporates such an input to output mixer.
How come you don't use potentiometers to control delay settings? Would the time it takes to ADC read each pot bring the audio sampling rate down too low? Trying to figure out if this would be a good long-term platform for guitar effects. Very cool project, thanks for sharing!
Reply 11 months ago. Hi - I adapted the Pedalshield as developed by Electrosmash code and they used switches instead of a potentiometer. It will be possible to add a pot to change the delay but I am currently not doing any work on this project.
Question 11 months ago on Step 3. Hi, thanks for the good explanation. Gretings from Mexico. Answer 11 months ago. By Tobiasv6 Instructables Follow. More by the author:. Attachments Breadboard1. Attachments pedalshielddelayv2. Did you make this project?
Share it with us! I Made It!Pages:  2 For the few last months I've been maintaining the MightyCore. I'm able to squash a few bugs here and there, but I sure need your help in order to make this a bug free core. Reference HERE! It got all the bells and whistles a hobbyist needs, including: A voltage select jumper to run the microcontroller at 5V or 3.
It adds support for ATmega64 and ATmega! Please let me know if you have any feedback! Where can I download one of those?
I'll give it a go on my 's and 's! Nice, I was just thinking, now who was that person who was making the unified core for all the Atmega x4 boards Great timing :- Quote from: hansibull on Feb 15,pm. Quote from: DrAzzy on Feb 15,pm. Quote from: DrAzzy on Feb 16,am. Code: [Select]. You need it to pick the better layout by default. Or just use the menu, which I think is better, because otherwise, the define is an "incantation" - a define that you'd never think of using unless someone told you, which has spooky effects on the compile process.
People would see it and assume that the core didn't support the other pin mapping. Yep, you got a point! I guess I'll add the Bobuino layout later.
ATMega1284 Quad Opamp Effects Box
Personally, I think the 'standard' layout is the best when you're breadboarding or doing anything else except using shields.
It's just much more logical and straight forward Standard pinout. Thanks for the heads up. I just finished building a simple board around the Atmega non-Pwith a 20Mhz crystal. I have optiboot working perfectly compiled from source downloaded from githuband it talks to the IDE at bauds. Neverthless I'll give your core a try! I don't see how you could ever get a define in sketch to pick the variant. While it may allow the sketch to see the appropriate macro definitions, the sketch is not the only entity that needs to have the correct information.
There are libraries that need the pin information and pin macros and since those are compiled separately, neither the library nor the headers that a library includes will see the "magic" define that was in the sketch. Any type of unified pins file included by the library will not be selecting the macros based on the define in the sketch so the library will see the incorrect macros and pin mappings.
Thanks Hansibull. I'm using your's already with a p. Well, just started. Though having issues getting my serials working. Hopefully get it sorted out soon.
Did try uploading the Multiwii flight controller sketch to it but had compiling issues though I suspect it due to pin layout issues.
Quote from: westfw on Feb 18,am. Great news! A Bobuino pinout option is added! You'll find it in the Tools menu.Compared to the previous instructable using the ATMega effects unit, this box has the following advantages:. I started by bread-boarding the Uno-based Open Music Labs Stompbox Shield and I was so impressed with the performance of this four OpAmp signal processing circuit even when using an Arduino Unothat I transferred it to stripboard for more permanent use.
Details and links for this process are given in appendix 1 of the previous instructable. Circuit 1 shows the circuit used and Stripboard 1 is its physical representation Fritzing 1 with Photo 1 the actual bread-boarded circuit in operation. Three small circuit changes were made: The shared half-supply-level opamp bias is used for three OpAmp stages, the 3 x 75k and 2 x 75k ohms parallel resistors were replaced with single 24k and 36k resistors, and the feedback capacitors were increased to pF for these two OpAmp stages.
The rotary control was replaced with two pushbuttons which are used to increase or decrease effects parameters. The three push buttons are connected to pins 1, 36 and 35 and earthed at the other end.
An LED is connected via a resistor to pin 2. The parts list contains a number of alternative OpAmp types. The 50k potentiometer is used to adjust the input gain to a level just below any distortion, and it can also be used to adjust the input sensitivity for an input source other than a guitar such as a music player. The second OpAmp input stage and the first opamp output stage has a higher order RC filter to remove the digitally generated MCU noise from the audio stream.
The two PWM outputs on PD4 and PD5 are set as the high and low bytes of the audio output and mixed with the two resistors 3k9 and 1M in a ratio low byte and high byte - which generates the audio output. The delay buffer has been increased from words to words, and PortD has been set as the output for the two PWM signals.
For the two examples included here, the header file is included in the sketch - i. Pushbuttons 1 and 2 are used in some of the sketches to increase or decrease an effect. In the delay example it increases or decreases the delay time. When the sketch is first loaded it starts with the maximum delay effect. For the flanger phaser sketch try to increase the feedback control for an enhanced effect. Open Music labs Music.
ATMega Effect Pedal.
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By Tobiasv6 Instructables Follow. More by the author:. Compared to the previous instructable using the ATMega effects unit, this box has the following advantages: 1 It has a mixer which mixes the unprocessed signal with the MCU processed signal - that means that the quality of the signal at the output is much improved. Attachments Stompbox Veroboard. Did you make this project? Share it with us! I Made It! Half Square Triangles Kinetic Art by andrei.