11bit ADC data from SAMD51 (M4) boards
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評価
- 難易度
- 4/5
- 見積もり時間
- 3〜5日
- 初心者へのやさしさ
- 42/100
- issue の種類
- バグ
- 明瞭さ
- おおむね明確
- 活発さ
- 活発
- 技術スタック
- c
- 領域
- embedded-iot
調査の方向性
Start by tracing how AnalogIn reads the ADC on SAMD51 boards and how that reading is scaled to CircuitPython’s 0–65535 range; compare this with a board where the reported values are not all even. The issue names no source files or tests, so locate the SAMD51 ADC implementation and relevant tests first. Done means explaining or fixing the even-valued 12-bit readings and verifying the behavior on the Feather M4 Express.
索引モデルが issue の本文から書いたものです。
説明
CircuitPython version and board name
`10.2.1` on Adafruit Feather M4 Express
Code/REPL
My code is too complex but the essence is `value` from `AnalogIn` (on `A5`) shifted by 4 bits.
Behavior
The values when converted from CircuitPython's 0-65535 using >> 4 to 0-4095 (12bit) values are all even.
Description
From my recent ADC testing which I was reviewing I am only seeing even values from an M4 board's ADC in CircuitPython when it's shifted to a 12 bit value. This suggests it's either set to 11 bits or something is zeroing the lsb??
Additional information
This is some of my raw data.
1311612915047,"triangle","B",0,"C","max",0,"[-1]",-0.0001875,"[8,8,6,8,6,4,8,8,6,6,6,6,6,6,6,6,6,6,8,6,6,6,6,6,6,8,8,6,8,6,6,8,8,6,6,6,6,6,6,6]"
1311659362795,"triangle","B",0,"C","max",0,"[-1]",-0.0001875,"[6,6,6,6,6,6,6,4,6,6,6,6,6,8,6,6,6,6,6,6,6,8,6,6,10,6,8,6,8,6,8,6,6,6,8,6,6,6,6,6]"
1311688812260,"triangle","B",0,"C","max",0,"[-1]",-0.0001875,"[8,8,8,6,6,6,6,6,6,8,6,6,12,6,6,6,6,6,6,6,6,6,6,6,6,6,6,8,6,6,8,6,6,6,6,8,6,8,6,6]"
1311718200689,"triangle","B",0,"C","max",0,"[-1]",-0.0001875,"[8,6,6,6,6,8,6,8,6,6,6,6,6,6,6,6,6,8,6,6,6,6,6,6,8,6,6,8,8,6,8,8,6,6,8,6,6,6,6,6]"
1311747283938,"triangle","B",0,"C","max",0,"[-1]",-0.0001875,"[8,8,6,6,6,6,6,6,6,8,6,6,8,6,6,6,6,6,4,6,6,6,6,6,8,6,6,6,6,6,14,6,6,8,6,6,6,6,4,6]"
1311785400394,"triangle","B",0,"C","max",0,"[0]",0.001125,"[6,8,8,6,8,6,6,6,6,6,6,8,6,6,6,6,6,8,6,8,6,6,6,6,6,6,6,8,6,8,6,6,6,6,8,8,6,6,6,8]"
1311832366948,"triangle","B",0,"C","max",0,"[1]",0.0024375,"[10,8,8,8,10,8,10,8,8,10,8,8,8,8,6,6,8,8,8,8,8,8,10,10,8,8,10,12,10,6,8,8,8,8,0,8,8,10,6,8]"
1311864807136,"triangle","B",0,"C","max",0,"[2]",0.00375,"[10,10,10,10,8,10,10,10,10,10,8,10,10,10,10,12,10,10,10,10,10,10,10,10,12,8,8,10,10,10,10,10,10,10,10,10,10,10,10,10]"
1311904510501,"triangle","B",0,"C","max",0,"[3]",0.004875,"[12,12,12,12,12,12,10,12,12,12,12,12,12,12,10,12,14,12,10,12,12,12,12,10,12,12,12,12,12,12,12,12,10,12,10,12,12,12,12,10]"
1311944824225,"triangle","B",0,"C","max",0,"[4]",0.006374998,"[14,12,14,12,14,12,12,12,12,14,12,12,12,12,14,14,12,14,12,14,12,12,12,14,14,12,14,14,12,14,14,16,14,14,14,14,14,12,14,12]"
1311985290540,"triangle","B",0,"C","max",0,"[5]",0.0075,"[16,14,14,16,16,16,14,14,14,20,14,14,14,14,16,16,14,10,14,14,14,14,14,16,16,14,14,16,14,14,14,16,16,16,14,14,16,14,14,14]"
1312028137218,"triangle","B",0,"C","max",0,"[6]",0.0088125,"[18,16,16,16,16,18,16,16,16,16,16,16,16,16,16,16,16,16,16,18,16,16,16,16,16,16,16,18,20,18,16,16,14,16,16,16,16,22,16,16]"
1312068511965,"triangle","B",0,"C","max",0,"[7]",0.0103125,"[18,18,18,18,18,18,18,20,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,20,18,18,18,16,18,18,14,18]"
1312108795171,"triangle","B",0,"C","max",0,"[8]",0.011625,"[24,20,20,20,18,22,20,20,18,20,20,20,20,20,20,20,20,20,20,18,20,20,20,20,20,20,20,18,20,20,20,20,20,20,20,20,20,22,20,20]"
Note the values in the last field are all even. I have same code running on many other boards and have witnessed no other problems. I am still reviewing my results so there's a small possibility this is an application bug authored by me...
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