schematic and build instructions

[alejoseb]

Hi,
Nice project and thanks for sharing. Can you provide schematics?

[Guitarman9119]

Hello Alejandro, Which schematics are you looking for? I have most of them uploaded on indestructibles: https://www.instructables.com/id/Nucleo-Guitar-Effects-Pedal/ Regards Vernon

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On Mon, Apr 1, 2019 at 11:03 PM Alejandro Mera ***@***.***> wrote: Hi, Nice project and thanks for sharing. Can you provide schematics? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ANo3dYTjwdwILBDSEu9YKwttwA_wsjX6ks5vch_SgaJpZM4cV86y> .

[alejoseb]

Hey thanks for your answer, I found your repository directly on GitHub, so I was not aware of your instructable post. You may add that link to the readme file. That might help everybody to find the whole information of your project.

[alejoseb]

Hi,
I was checking your code and seems it is not a working version. It includes a DMA configuration for ADC but you are actually not using it. In addition there is no code for the output and DAC section. Can you upload a working version of your code. Thanks in advance

[Guitarman9119]

I don't have the original pedal with me, plan to rebuild it again soon but according to the DAC section: while(1) { button_control(); adc_sample = HAL_ADC_GetValue(&hadc1) / 4096.0f ; adc_sample += 0.0126953f; if(adc_sample< 0.501 && adc_sample > 0.499) adc_sample = 0.5; // List of Effects if(effect_state == 0) modified_sample = clean(adc_sample); else if (effect_state == 1) modified_sample = tremolo(adc_sample); else if (effect_state == 2) modified_sample = tremolo2(adc_sample); else if (effect_state == 3) modified_sample = ez_distort(adc_sample); else if (effect_state == 4) modified_sample = ez_distort2(adc_sample); else if (effect_state == 5) modified_sample = flanger(adc_sample); else if (effect_state == 6) modified_sample = delay(adc_sample); modified_sample -= 0.0126953f; analog_out = modified_sample; } } analog_out is the DAC pin PA_4, if you do not use DMA, and just use analog in, it does not make any change in terms of audio quality (frequency range of guitar) so if you should un-comment //AnalogIn analog_in(PA_0); and change adc_sample = analog_in / 4096.0f ; in the while(1), this will also work. I have a folder with code at home, not sure is it the same version will check and send it to you. If there is anything else let me know and I will try to assist. Regards Vernon

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On Thu, Oct 10, 2019 at 12:45 AM Alejandro Mera ***@***.***> wrote: Hi, I was checking your code and seems it is not a working version. It includes a DMA configuration for ADC but you are actually using it. In addition there is no code for the output and DAC section. Can you upload a working version of your code. Thanks in advance — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1?email_source=notifications&email_token=ADNDO5LRPXTYSHYQ7ATLXTTQNYDC5A5CNFSM4HCXZ2ZKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEAYRCUI#issuecomment-540086609>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADNDO5L3APL5SN3O5MH7CTDQNYDC5ANCNFSM4HCXZ2ZA> .

[alejoseb]

Thanks, for your answer I double checked and yes the analog output is correct. However, the DMA implementation is not clear, I believe something is wrong there, because there is no configuration of a buffer where you should store the samples coming from ADC. In addition I checked the source code of HAL_ADC_GetValue(&hadc1). That function access directly DR register of ADC, so technically is not using DMA. I am curious about that, because I am reviewing multiple examples with DMA and this particular example is not as expected. There are some missing parts in the configuration (for example source, destination and length of DMA transfer). I will try some modifications with a complete configuration and see if the code works as expected.

[Guitarman9119]

The DMA part was a nightmare for me, my programming skills and knowledge that time was not up to par. I wanted to make some delay effect and ended up just doing basic effects due to time constraints and finals in other subjects.

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On Thu, Oct 10, 2019 at 9:06 AM Alejandro Mera ***@***.***> wrote: Thanks, for your answer I double checked and yes the analog output is correct. However, the DMA implementation is not clear, I believe something is wrong there, because there is no configuration of a buffer where you should store the samples coming from ADC. In addition I checked the source code of HAL_ADC_GetValue(&hadc1). That function access directly DR register of ADC, so technically is not using DMA. I am curious about that, because I am reviewing multiple examples with DMA and this particular example is not as expected. There are some missing parts in the configuration (for example source, destination and length of DMA transfer). I will try some modifications with a complete configuration and see if the code works as expected. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1?email_source=notifications&email_token=ADNDO5NVCCE7JIT5OUK7UBTQNZ52HA5CNFSM4HCXZ2ZKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEAZ7JUA#issuecomment-540275920>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADNDO5PCVF4NAP3ZCZSEXTLQNZ52HANCNFSM4HCXZ2ZA> .