<div style="color:black;font: 10pt Arial, Helvetica, sans-serif;">RP2040 has a single 500kS/sec 12-bit ADC with a zero-settling-delay* input mux and dedicated FIFO. That's something that the cheap alternatives haven't had. Or at least I thought I had searched for that option in 2019 and had not found anything. I didn't keep my notes.
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<div>I care about this stuff because I'd like the audio localizer to be smaller, cheaper, etc. <span style="background-color: transparent; font-size: 10pt;">12 bits is nowhere near enough for what I want to do, but it's great to see it built into the processor chip at $4 on a board. TI had similar offerings but with significantly greater features at considerably higher prices like $9 to $30.</span></div>
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<div>If the highest measured frequency is low enough and the latency is acceptable, then the hardware FIFO can assist with oversampling. With CPU overhead, more oversampling can be done. But, unfortunately, to get to 16 bits of resolution, the highest measured frequency would only be about 1kHz (half of 500kS/s / (2^4)^2).</div>
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<div>Impressed that the little CPU has a 600 page datasheet. Makes sense considering all the stuff in it.<br>
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*I think they can say this because all conversions take the same amount of time and some conversions fail due to lack of time, so I think there actually is settling delay, but it's built into the latency.<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Murray Altheim via DPRGlist <dprglist@lists.dprg.org><br>
To: dprglist@lists.dprg.org<br>
Sent: Thu, Jan 21, 2021 9:33 pm<br>
Subject: Re: [Dprglist] New Raspberry Pi RP2040 boards<br>
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<div dir="ltr">On 22/01/21 2:36 pm, Rud Merriam via DPRGlist wrote:<br>
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<div dir="ltr">> I now see there is an Arduino board using that chip and possibly<br>
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<div dir="ltr">> support for the original using Arduino IDE.<br>
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<div dir="ltr">FYI, the new board will be called the "Arduino Nano RP2040 Connect", a Nano<br>
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<div dir="ltr">form factor, 16MB of flash memory, a 9-axis IMU and some sensors, with an<br>
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<div dir="ltr">announcement by Massimo Banzi of Arduino at:<br>
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<div dir="ltr"><br>
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<div dir="ltr"> <a href="https://blog.arduino.cc/2021/01/20/welcome-raspberry-pi-to-the-world-of-microcontrollers/" target="_blank">https://blog.arduino.cc/2021/01/20/welcome-raspberry-pi-to-the-world-of-microcontrollers/</a><br>
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<div dir="ltr"><br>
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<div dir="ltr">As regards using the Arduino IDE, quoting Mr. Banzi:<br>
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<div dir="ltr"><br>
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<div dir="ltr"> "We are going to port the Arduino core to this new architecture in<br>
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<div dir="ltr"> order to enable everyone to use the RP2040 chip with the Arduino<br>
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<div dir="ltr"> ecosystem (IDE, command line tool, and thousands of libraries)."<br>
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<div dir="ltr"><br>
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<div dir="ltr">Cheers,<br>
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<div dir="ltr">Murray<br>
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<div dir="ltr"><br>
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<div dir="ltr">...........................................................................<br>
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<div dir="ltr">Murray Altheim <murray18 at altheim dot com> = = ===<br>
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<div dir="ltr"><a href="http://www.altheim.com/murray/" target="_blank">http://www.altheim.com/murray/ </a> === ===<br>
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<div dir="ltr"> = = ===<br>
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<div dir="ltr"> In the evening<br>
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