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55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
# hackable-ble-audio
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Project to research, find and create a hackable platform for smart audio connectivity and seamless transmission between receiving and transmitting devices on same channel
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## Idea
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Keypoints:
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looked at what my ble trans/receiver I had in its guts in, [images here](./resources/aukey%20board%20images).
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The main chips I see are:
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- csr8670 - Bluetooth Audio SoC [more info](#csr8670)
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- sgm3717 - 4Ω, 400MHz Bandwidth, Dual, SPDT Negative Signal Handling Analog Switch [more info](#sgm3717)
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- p8908 - 25mW TRUE CAP FREE STEREO HEADPHONE AMPLIFIER [more info](#p8908)
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# csr8670
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The csr8670 is a SoC with BLE, embedded flash for receiving and outputing audio signals.
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Important note is that the csr8670 in my device has a newer version, the 8675.
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In a product newsletter from Shenzhen Feasycom has a overviewed comparison between the old and new models [0].
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csr8670 | csr8675 | notes
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-- | -- | --
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BT4.0 | BT4.1 | OS upgrade to BT 5.0
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80 Mhz RISC MCU and 80 MIPS Kalimba DSP
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16-bit audio | 24-bit audio |
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8-96kHz | 8-192kHz | Supported sample rates
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16Mb Flash | 16Mb Flash | External 64Mb SPI Flash
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Stereo codec and 2 path MIC | Stereo codec and 2 path MIC |
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1 x I²S/PCM | 2 x I²S/PCM | Meet the needs of multiple digital audio interfaces
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SPDIF (blocks I²S/PCM's) | SPDIF (non-blocking I²S/PCM)
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UART, USB2.0 full-speed, I²C | UART, USB2.0 full-speed, I²C & SPI | Serial interfaces
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| Master and slave bit-serialiser (I²C and SPI) |
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6 capacitive touch sensor inputs
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Battery charger
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3 LED and LCD segment driver
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29 PIO ports | 32 PIO ports | Up to w/ BGA package
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## Documetation & references
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- Product Page [qualcomm.com](https://www.qualcomm.com/products/csr8670) [pdf](./resources/csr8670/CSR8670%20%7C%20Qualcomm%20Productbrief.pdf)
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- Product Brief [qualcomm.com](https://www.qualcomm.com/media/documents/files/csr8670-product-brief.pdf) [pdf](./resources/csr8670/CSR8670%20%7C%20Qualcomm%20Productpage.pdf)
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- Digikey product page [digikey](https://www.digikey.com/catalog/en/partgroup/csr8670/28987) [pdf](./resources/csr8670/CSR8670%20-%20Qualcomm%20-%20Integrated%20Circuits%20%28ICs%29%20%7C%20Online%20Catalog%20%7C%20DigiKey%20Electronics.pdf)
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- [0] CSR8670 vs CSR8675 [feasy.com](http://www.feasycom.net/news/difference-between-csr8670-and-csr-15721421.html) [pdf](./resources/csr8670/CSR8670%20vs%20CSR8675%20-%20Product%20News%20-%20Shenzhen%20Feasycom%20Technology%20Co.%2CLtd%20%7C%20feasycom.net)
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## Sources
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TODO:
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Chip maker, info and important takeaways.
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Pros and cons.
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