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Showing Pictures on Oscilloscopes

misaz
Showing Pictures on Oscilloscopes

Hello element14 community.

In this blog I would like to share and describe how to show pictures on oscilloscopes. I used this technique for testing new oscilloscopes. At element14 community I shown it first time when received my first MP720644 tablet oscilloscope: MP720644 Multicomp Pro Tablet Oscilloscope and recently I slightly upgraded it after I received my latest bench oscilloscope which I received as part of contest reward: Received Experimenting with Supercapacitors Runner Up Prize. When probes attached to signal generator, it looks on the scope as follows:

image

For making such pictures on scope you need two things:

  • Waveform data, or more precisely software which converts picture to such data
  • Signal generator hardware, or more precisely arbitrary waveform generator

Rendering filled areas

The idea on filling areas is that if you generate oscillation pattern and zoom it out enough, it looks like filled area on the scope. Look at following signal. It is basic clock signal.

image

If you zoom it out slightly it looks as follows:

image

If you zoom out it furthermore, it will look as follows:

image

The vertical position is defined by voltage. In previous case signal oscillates between 0 and 3.3V, but with proper generator you can make it oscillate between different voltages. If your generator has multiple channels, you can generate multiple “filled” patters at the same time.

This is exactly how my element14 logo generator works. It oscillates and change oscillation voltage boundaries dynamically. If there are multiple vertical filled elements, channels splits and each channel generates some part of logo. For example, zoomed e letter looks like this:

image

Generator

As a generator you can use arbitrary waveform generator. But I do not have any, so I implemented myself DIY one. Analog signal can be generated using several approaches, but most convenient is using DAC (Digital-to-Analog converter). Some methods like using PWM + low pass filter may not be fast enough at transitions when oscillating, but when properly tuned they may work also. I just did not try them and went with convenient DAC way.

When I was generating waveforms for a first time, I used DAC integrated in STM32L5 microcontroller. But It was limited to only two channels. For my latest experiments with 4-ch scope, I changed setup and used external 4-ch SPI MAX5715 DAC chip and also changed microcontroller by Cypress/Infineon PSoC 62 microcontroller (on CY8CKIT-062S4 board) because it has more advanced DMA for transferring waveform data and commands to external DAC chip.

Converting picture to waveform data

The first step is converting picture to waveform data. In my case because I process them by MCUs, I generated outputs in form of C file.

The program I wrote in my favourite programming language Visual Basic .NET and it is very simple. Code quality is not very good, but I considered only single-purpose never expanded program. It loads picture from file and iterates over columns of the input image. In each column (yellow line of following picture) it checks horizontal regions filled by non-white color (with some threshold for filtering light colors). In case of example below, in column highlighted by yellow line, it finds 3 horizontal regions.

image

After searching regions, it maps them to channel. If there are not enough channels (for example, 2-ch generator can’t render 3 regions), it collapses some regions. It maps found regions to channels while optimizing crossing and transitions of channels from previous step. It generates signal in way that oscillates between boundaries of current and previous region mapped to the same channel.

At the end it generates waveform data as uint16_t array which it prints. It recomputes signal height from pixels to 12-bit range used by 12-bit DACs (values in range between 0 to 4095).

Later I added support for adding delay between repeating transmissions for make gaps between transmission of image.

Element14 2-ch logo

image

Waveform data are following:

uint16_t waveform_ch1[990] = {0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0527, 0x08FA, 0x0400, 0x09C7, 0x0361, 0x0A38, 0x0305, 0x0A7D, 0x02C1, 0x0AAA, 0x0294, 0x0AD7, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x056C, 0x0222, 0x0444, 0x020B, 0x03BB, 0x020B, 0x0377, 0x01F5, 0x0361, 0x01F5, 0x0333, 0x01DE, 0x0333, 0x01DE, 0x031C, 0x01DE, 0x031C, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x0222, 0x0A93, 0x0666, 0x0A38, 0x0666, 0x09C7, 0x0666, 0x08FA, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0816, 0x049F, 0x093E, 0x03D2, 0x09C7, 0x034A, 0x0A38, 0x02EF, 0x0A93, 0x02C1, 0x0AC1, 0x0294, 0x0AEE, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x04E3, 0x0222, 0x0400, 0x020B, 0x03A5, 0x01F5, 0x0377, 0x01F5, 0x034A, 0x01F5, 0x0333, 0x01DE, 0x031C, 0x01DE, 0x031C, 0x01DE, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x020B, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x0222, 0x0305, 0x0222, 0x0A7D, 0x0666, 0x0A21, 0x0666, 0x0999, 0x0666, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0A38, 0x0816, 0x0A66, 0x08CC, 0x0A93, 0x093E, 0x0AC1, 0x0982, 0x0AEE, 0x09B0, 0x0B05, 0x09DD, 0x0B33, 0x09F4, 0x0B49, 0x0A21, 0x0B60, 0x0A21, 0x0B77, 0x0A38, 0x0B77, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A38, 0x0B8D, 0x0A21, 0x0B8D, 0x0A0B, 0x0B8D, 0x09DD, 0x0B77, 0x09B0, 0x0B60, 0x0927, 0x01F5, 0x0B49, 0x01DE, 0x0B33, 0x01DE, 0x0B05, 0x01DE, 0x0AEE, 0x01DE, 0x0AAA, 0x01DE, 0x0A66, 0x01DE, 0x0A21, 0x01DE, 0x0A4F, 0x01DE, 0x0A93, 0x08CC, 0x0AC1, 0x096B, 0x0AEE, 0x09B0, 0x0B05, 0x09DD, 0x0B1C, 0x0A0B, 0x0B33, 0x0A21, 0x0B49, 0x0A38, 0x0B60, 0x0A38, 0x0B77, 0x0A4F, 0x0B77, 0x0A4F, 0x0B8D, 0x0A66, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0B8D, 0x0A38, 0x0B8D, 0x0A38, 0x0B77, 0x0A0B, 0x0B77, 0x09F4, 0x0B60, 0x0999, 0x0B49, 0x08E3, 0x01DE, 0x0B1C, 0x01DE, 0x0B05, 0x01DE, 0x0AEE, 0x01DE, 0x0AC1, 0x01DE, 0x0A7D, 0x01DE, 0x0A38, 0x01DE, 0x09C7, 0x01DE, 0x093E, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x07BB, 0x04CD, 0x0927, 0x03E9, 0x09C7, 0x0361, 0x0A38, 0x0305, 0x0A7D, 0x02C1, 0x0AC1, 0x0294, 0x0AEE, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x0511, 0x0222, 0x0417, 0x020B, 0x03A5, 0x020B, 0x0377, 0x01F5, 0x034A, 0x01F5, 0x0333, 0x01DE, 0x0333, 0x01DE, 0x031C, 0x01DE, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x0222, 0x0A7D, 0x0666, 0x0A38, 0x0666, 0x09B0, 0x0666, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B33, 0x01DE, 0x0A4F, 0x085B, 0x0A93, 0x08FA, 0x0AD7, 0x0955, 0x0AEE, 0x0999, 0x0B1C, 0x09C7, 0x0B33, 0x09F4, 0x0B49, 0x0A0B, 0x0B60, 0x0A21, 0x0B77, 0x0A38, 0x0B77, 0x0A38, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0B8D, 0x0A38, 0x0B8D, 0x0A21, 0x0B8D, 0x0A0B, 0x0B77, 0x09DD, 0x0B77, 0x0982, 0x0B60, 0x020B, 0x0B49, 0x01DE, 0x0B33, 0x01DE, 0x0B1C, 0x01DE, 0x0B05, 0x01DE, 0x0AD7, 0x01DE, 0x0A93, 0x01DE, 0x0A38, 0x01DE, 0x0982, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0B77, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x03D2, 0x0E65, 0x0305, 0x0E65, 0x02C1, 0x0E65, 0x027D, 0x0E65, 0x024F, 0x0E65, 0x0239, 0x0E65, 0x020B, 0x0E65, 0x020B, 0x0E65, 0x01F5, 0x0417, 0x01DE, 0x038E, 0x01DE, 0x034A, 0x01C7, 0x031C, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01DE, 0x02EF, 0x01DE, 0x0305, 0x01DE, 0x02D8, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x0BA4, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0BA4, 0x060B, 0x0BBB, 0x056C, 0x0BBB, 0x0511, 0x0BBB, 0x04CD, 0x0BBB, 0x0488, 0x0BBB, 0x045B, 0x0BBB, 0x0444, 0x0BBB, 0x0417, 0x0BA4, 0x0400, 0x0639, 0x0400, 0x05B0, 0x03E9, 0x056C, 0x03D2, 0x053E, 0x03D2, 0x0527, 0x03BB, 0x0511, 0x03BB, 0x0511, 0x03BB, 0x04FA, 0x03A5, 0x04FA, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x038E, 0x04E3, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x03A5, 0x04CD, 0x038E, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x03A5, 0x04E3, 0x03BB, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03E9, 0x0511, 0x03E9, 0x0511, 0x03E9, 0x0511, 0x0400, 0x0511, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400};
uint16_t waveform_ch2[990] = {0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0FFF, 0x0527, 0x08FA, 0x0400, 0x09C7, 0x0361, 0x0A38, 0x0305, 0x0A7D, 0x02C1, 0x0AAA, 0x0294, 0x0AD7, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x0B33, 0x0666, 0x0B49, 0x0666, 0x0B60, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B60, 0x0666, 0x0B49, 0x0666, 0x0B33, 0x0666, 0x0B33, 0x0666, 0x0B05, 0x0666, 0x0AEE, 0x0666, 0x0AC1, 0x0666, 0x0A93, 0x0666, 0x0A38, 0x0666, 0x09C7, 0x0666, 0x08FA, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0816, 0x049F, 0x093E, 0x03D2, 0x09C7, 0x034A, 0x0A38, 0x02EF, 0x0A93, 0x02C1, 0x0AC1, 0x0294, 0x0AEE, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x0B33, 0x0666, 0x0B49, 0x0666, 0x0B60, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B60, 0x0666, 0x0B60, 0x0666, 0x0B49, 0x0666, 0x0B33, 0x0666, 0x0B1C, 0x0666, 0x0B05, 0x0666, 0x0AEE, 0x0666, 0x0AC1, 0x0666, 0x0A7D, 0x0666, 0x0A21, 0x0666, 0x0999, 0x0666, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x089F, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0A38, 0x0816, 0x0A66, 0x08CC, 0x0A93, 0x093E, 0x0AC1, 0x0982, 0x0AEE, 0x09B0, 0x0B05, 0x09DD, 0x0B33, 0x09F4, 0x0B49, 0x0A21, 0x0B60, 0x0A21, 0x0B77, 0x0A38, 0x0B77, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A38, 0x0B8D, 0x0A21, 0x0B8D, 0x0A0B, 0x0B8D, 0x09DD, 0x0B77, 0x09B0, 0x0B60, 0x0927, 0x01F5, 0x0B49, 0x01DE, 0x0B33, 0x01DE, 0x0B05, 0x01DE, 0x0AEE, 0x01DE, 0x0AAA, 0x01DE, 0x0A66, 0x01DE, 0x0A21, 0x01DE, 0x0A4F, 0x01DE, 0x0A93, 0x08CC, 0x0AC1, 0x096B, 0x0AEE, 0x09B0, 0x0B05, 0x09DD, 0x0B1C, 0x0A0B, 0x0B33, 0x0A21, 0x0B49, 0x0A38, 0x0B60, 0x0A38, 0x0B77, 0x0A4F, 0x0B77, 0x0A4F, 0x0B8D, 0x0A66, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0B8D, 0x0A38, 0x0B8D, 0x0A38, 0x0B77, 0x0A0B, 0x0B77, 0x09F4, 0x0B60, 0x0999, 0x0B49, 0x08E3, 0x01DE, 0x0B1C, 0x01DE, 0x0B05, 0x01DE, 0x0AEE, 0x01DE, 0x0AC1, 0x01DE, 0x0A7D, 0x01DE, 0x0A38, 0x01DE, 0x09C7, 0x01DE, 0x093E, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x07BB, 0x04CD, 0x0927, 0x03E9, 0x09C7, 0x0361, 0x0A38, 0x0305, 0x0A7D, 0x02C1, 0x0AC1, 0x0294, 0x0AEE, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x0B33, 0x0666, 0x0B49, 0x0666, 0x0B60, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0BA4, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B8D, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B77, 0x0666, 0x0B60, 0x0666, 0x0B49, 0x0666, 0x0B33, 0x0666, 0x0B1C, 0x0666, 0x0B05, 0x0666, 0x0AEE, 0x0666, 0x0AC1, 0x0666, 0x0A7D, 0x0666, 0x0A38, 0x0666, 0x09B0, 0x0666, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B33, 0x01DE, 0x0A4F, 0x085B, 0x0A93, 0x08FA, 0x0AD7, 0x0955, 0x0AEE, 0x0999, 0x0B1C, 0x09C7, 0x0B33, 0x09F4, 0x0B49, 0x0A0B, 0x0B60, 0x0A21, 0x0B77, 0x0A38, 0x0B77, 0x0A38, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A4F, 0x0B8D, 0x0A38, 0x0B8D, 0x0A21, 0x0B8D, 0x0A0B, 0x0B77, 0x09DD, 0x0B77, 0x0982, 0x0B60, 0x020B, 0x0B49, 0x01DE, 0x0B33, 0x01DE, 0x0B1C, 0x01DE, 0x0B05, 0x01DE, 0x0AD7, 0x01DE, 0x0A93, 0x01DE, 0x0A38, 0x01DE, 0x0982, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0B77, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x03D2, 0x0E65, 0x0305, 0x0E65, 0x02C1, 0x0E65, 0x027D, 0x0E65, 0x024F, 0x0E65, 0x0239, 0x0E65, 0x020B, 0x0E65, 0x020B, 0x0E65, 0x01F5, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A93, 0x0B60, 0x01C7, 0x02EF, 0x01DE, 0x02EF, 0x01DE, 0x0305, 0x01DE, 0x02D8, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x01F5, 0x0BA4, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x0BBB, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0BA4, 0x060B, 0x0BBB, 0x056C, 0x0BBB, 0x0511, 0x0BBB, 0x04CD, 0x0BBB, 0x0488, 0x0BBB, 0x045B, 0x0BBB, 0x0444, 0x0BBB, 0x0417, 0x0BA4, 0x0400, 0x0639, 0x0400, 0x05B0, 0x03E9, 0x056C, 0x03D2, 0x053E, 0x03D2, 0x0527, 0x03BB, 0x0511, 0x03BB, 0x0511, 0x03BB, 0x04FA, 0x03A5, 0x04FA, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x03A5, 0x04E3, 0x038E, 0x04E3, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x038E, 0x04CD, 0x03A5, 0x04CD, 0x038E, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x01DE, 0x096B, 0x03A5, 0x04E3, 0x03BB, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03D2, 0x04FA, 0x03E9, 0x0511, 0x03E9, 0x0511, 0x03E9, 0x0511, 0x0400, 0x0511, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400, 0x0400};

Element14 4-ch logo

image

4-ch logo allows rendering e letter with empty gap. It requires at least 3-ch to render. With 2-ch waveform it was filled as visible on previous image. 4-ch is used as trigger signal.

Waveform data are following:

uint16_t waveform_ch1[1240] = {0x0527, 0x08FA, 0x0400, 0x09C7, 0x0361, 0x0A38, 0x0305, 0x0A7D, 0x02C1, 0x0AAA, 0x0294, 0x0AD7, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x056C, 0x0222, 0x0444, 0x020B, 0x03BB, 0x020B, 0x0377, 0x01F5, 0x0361, 0x01F5, 0x0333, 0x01DE, 0x0333, 0x01DE, 0x031C, 0x01DE, 0x031C, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x0222, 0x0A93, 0x0666, 0x0A38, 0x0666, 0x09C7, 0x0666, 0x08FA, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x067D, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x0E4F, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x01DE, 0x0816, 0x049F, 0x093E, 0x03D2, 0x09C7, 0x034A, 0x0A38, 0x02EF, 0x0A93, 0x02C1, 0x0AC1, 0x0294, 0x0AEE, 0x0266, 0x0B05, 0x024F, 0x0B1C, 0x0239, 0x04E3, 0x0222, 0x0400, 0x020B, 0x03A5, 0x01F5, 0x0377, 0x01F5, 0x034A, 0x01F5, 0x0333, 0x01DE, 0x031C, 0x01DE, 0x031C, 0x01DE, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x02EF, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01C7, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x0305, 0x01DE, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x01F5, 0x031C, 0x020B, 0x0333, 0x020B, 0x0333, 0x020B, 0x0333, 0x0222, 0x0305, 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0x0B8D, 0x0A4F, 0x0BA4, 0x0A4F, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A66, 0x0BA4, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A4F, 0x0B8D, 0x0A38, 0x0B77, 0x0A21, 0x0B77, 0x0A0B, 0x0B77, 0x09DD, 0x0B60, 0x0999, 0x0B49, 0x08FA, 0x0B33, 0x0B33, 0x0666, 0x0B1C, 0x0666, 0x0B05, 0x0666, 0x0AD7, 0x0666, 0x0AAA, 0x0A7D, 0x0666, 0x0A38, 0x0666, 0x09B0, 0x0666, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x08CC, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B8D, 0x01DE, 0x0B33, 0x01DE, 0x0A4F, 0x085B, 0x0A93, 0x08FA, 0x0AD7, 0x0955, 0x0AEE, 0x0999, 0x0B1C, 0x09C7, 0x0B33, 0x09F4, 0x0B49, 0x0A0B, 0x0B60, 0x0A21, 0x0B77, 0x0A38, 0x0B77, 0x0A38, 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uint16_t waveform_trig[1240] = {0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 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Firmware

Latest firmware is pretty simple (but debugging chained DMA transfers were quite hard). It defines two chained DMA descriptors. Each descriptor link as next descriptor the other one. Except waveform data, transmitted data contains command code and channel selector. It is 3-byte (24-bit) SPI transmission. After transmission completes, DMA wait for trigger signal which is driven by timer for precise timing and when happens it transmit next command. In meantime CPU in interrupt handler updates the previously completed DMA descriptor with new data for next transmission. The MAX5715 allows to update channels at the same time, so first 3 channels are transmitted to the DAC, but signal update is not triggered (only shadow register in MAX5715 is updated). Signal update of all channels is triggered after sending data for the last 4th channel. This cause that all 4-ch channels update to the new data at the same time.

Firmware basically initialize SPI hardware, timer hardware and DMA channels. Then it setup interrupts, fill first DMA descriptors and then ends up in empty infinite loop. In interrupts of DMA completions, it just load new data to DMA descriptors.

Conclusion

It is all from this blog. You have seen how I generated beautiful element14 logo on the oscilloscope screen. In the section below you can download my firmware for PSoC 62 microcontroller as well as software for converting images to signals. Thank you for you attention and have a nice day.

Resources

Image to Waveform Convert Tool VB.NET Source Codes (ZIP)

Waveform signal generator (4ch) for PSoC 62 and MAX5715 DAC Source Codes (ZIP)

Waveform signal generator (2ch) for STM32L5 Source Codes (ZIP)