Eval » Historie » Version 35
Maximilian Seesslen, 31.08.2023 14:55
| 1 | 1 | Maximilian Seesslen | h1. Eval |
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| 3 | CANDis is quite silent. |
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| 4 | |||
| 5 | CANBuz probably will have same issues. Need to test capacitors. |
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| 6 | 6 | Maximilian Seesslen | F=As/V |
| 7 | qalc 0,000022*3 = 0,000066 = 0,066mAs |
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| 8 | Ich hab doch noch grosse |
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| 9 | 12 | Maximilian Seesslen | Is it the power regulator/LDO? What did i solder? |
| 10 | 1 | Maximilian Seesslen | |
| 11 | h2. Parts |
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| 12 | |||
| 13 | 3 | Maximilian Seesslen | * LM386; "DS":https://www.ti.com/lit/ds/symlink/lm386.pdf ; page 10 |
| 14 | 13 | Maximilian Seesslen | * LM4861 M; 1,39€ |
| 15 | ** can be driven @5V; not sure if V+ has to be 3v/2 or 5v/2 ? |
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| 16 | ** Shutdown: power output off on logic high |
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| 17 | |||
| 18 | 14 | Maximilian Seesslen | h2. Amp |
| 19 | 2 | Maximilian Seesslen | |
| 20 | 14 | Maximilian Seesslen | "lm4871":https://www.ti.com/lit/ds/symlink/lm4871.pdf |
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| 22 | 2 | Maximilian Seesslen | h2. MCU |
| 23 | |||
| 24 | 4 | Maximilian Seesslen | * STM32F042G4U6; UFQFPN28; 16KB; hab ich noch 17 |
| 25 | 9 | Maximilian Seesslen | * Get rid of an STM32F072 in order to have DAC? |
| 26 | * STM32G431KBU6 |
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| 27 | 14 | Maximilian Seesslen | ** SAI; FPU |
| 28 | ** 5,87€ |
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| 29 | 15 | Maximilian Seesslen | * STM32F072CBT6 |
| 30 | ** LQFP-48 |
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| 31 | ** 2,40 € |
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| 32 | * STM32F103CBT6 |
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| 33 | ** 2,12 € |
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| 34 | 33 | Maximilian Seesslen | * STM32F303K8 -C6U6A- |
| 35 | 32 | Maximilian Seesslen | ** FPU; Cortex M4; 72MHz |
| 36 | 1 | Maximilian Seesslen | ** When name is really correct, its a LQFP48 with 32KB flash |
| 37 | 33 | Maximilian Seesslen | ** No, it's LQFP32 with 64KB flash |
| 38 | 31 | Maximilian Seesslen | |
| 39 | 14 | Maximilian Seesslen | |
| 40 | 5 | Maximilian Seesslen | h2. DAC |
| 41 | |||
| 42 | 11 | Maximilian Seesslen | * Maybe later; SAI would be more interesting. DAC for testing DMA. |
| 43 | 7 | Maximilian Seesslen | * 44,100 Hz |
| 44 | * Would require SPI flash for recorded sound |
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| 45 | 8 | Maximilian Seesslen | * Adjustable volume |
| 46 | 1 | Maximilian Seesslen | * Solderbridge for fallback |
| 47 | 24 | Maximilian Seesslen | |
| 48 | h2. Replay |
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| 49 | |||
| 50 | Would need 20KHz; |
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| 51 | have 12 Kbytes RAM; |
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| 52 | 2KB plays 1/20secs |
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| 53 | |||
| 54 | 29 | Maximilian Seesslen | Stereo gets tricky. There is only 1 SPI. Would need to couple DAC outputs. Maybe test this later. |
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| 57 | 26 | Maximilian Seesslen | |
| 58 | 17 | Maximilian Seesslen | h2. Flash |
| 59 | |||
| 60 | DAC-DMA already works for sinewave (copied due to speed). So FLash might be cool for sound samples. |
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| 61 | 18 | Maximilian Seesslen | CD: 44100 samples / sec; |
| 62 | 22 | Maximilian Seesslen | 44100*2*2 = 176'400 Bytes / s; Flash readout has to be a little bit faster for the overhead. |
| 63 | 18 | Maximilian Seesslen | |
| 64 | 19 | Maximilian Seesslen | 1MB would play around 6 seconds. 2MB / 16Mbit would be ok. |
| 65 | 1 | Maximilian Seesslen | 32Mb/4MB available for 1,94€; 100Mhz |
| 66 | 28 | Maximilian Seesslen | STM32F303 has max SPI rate 18Mbits/s or 2,25MB/s wide range voltage; 24Mb/s or 3MBytes/s normal range |
| 67 | 25 | Maximilian Seesslen | |
| 68 | MX25L3233FM1I-08G is 83 cents; supports QIO |
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| 69 | |||
| 70 | Irgendwas muesstte ich eh noch haben, hab mal groesser eingekauft. |
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| 71 | |||
| 72 | 21 | Maximilian Seesslen | h2. USB |
| 73 | |||
| 74 | 1 | Maximilian Seesslen | USB would be nice for writing sound samples to flash. But this might be a nice candidate for writing flash images over CAN. |
| 75 | 35 | Maximilian Seesslen | Although it might take very long time. |
| 76 | |||
| 77 | h2. Flash via CAN |
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| 78 | |||
| 79 | A CAN frame has 108 bits. 500khz/108 = 4629 Msg/sec = 18KB/s |
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| 80 | 1 | Maximilian Seesslen | 32MB needs 1820 seconds, 30 minutes. Flashing sector by sector with retrys is needed. |
| 81 | 35 | Maximilian Seesslen | |
| 82 | A sektor has 4K |