From e3cc31978fdc0ef66dc3fa4220b94f134d2a5b76 Mon Sep 17 00:00:00 2001 From: KevinMidboe Date: Tue, 13 Aug 2019 01:25:36 +0200 Subject: [PATCH] Filled in some info about my chip and started summarizing its larger components/SoC/ICs. Started with the chip doing most of the computations, ble and audio converting csr8670 from qualcomm --- README.md | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/README.md b/README.md index fbe41bd..dd6ffa0 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,54 @@ # hackable-ble-audio Project to research, find and create a hackable platform for smart audio connectivity and seamless transmission between receiving and transmitting devices on same channel + + +## Idea +Keypoints: +looked at what my ble trans/receiver had in its guts in [this video](./resources/pinout.m4v). +The main chips I see are: + - csr8670 - Bluetooth Audio SoC [more info](#csr8670) + - sgm3717 - 4Ω, 400MHz Bandwidth, Dual, SPDT Negative Signal Handling Analog Switch [more info](#sgm3717) + - p8908 - 25mW TRUE CAP FREE STEREO HEADPHONE AMPLIFIER [more info](#p8908) + + + +# csr8670 + +The csr8670 is a SoC with BLE, embedded flash for receiving and outputing audio signals. + + +Important note is that the csr8670 in my device has a newer version, the 8675. +In a product newsletter from Shenzhen Feasycom has a overviewed comparison between the old and new models [0]. + +csr8670 | csr8675 | notes +-- | -- | -- +BT4.0 | BT4.1 | OS upgrade to BT 5.0 +80 Mhz RISC MCU and 80 MIPS Kalimba DSP +16-bit audio | 24-bit audio | +8-96kHz | 8-192kHz | Supported sample rates +16Mb Flash | 16Mb Flash | External 64Mb SPI Flash +Stereo codec and 2 path MIC | Stereo codec and 2 path MIC | +1 x I²S/PCM | 2 x I²S/PCM | Meet the needs of multiple digital audio interfaces +SPDIF (blocks I²S/PCM's) | SPDIF (non-blocking I²S/PCM) +UART, USB2.0 full-speed, I²C | UART, USB2.0 full-speed, I²C & SPI | Serial interfaces + | Master and slave bit-serialiser (I²C and SPI) | +6 capacitive touch sensor inputs +Battery charger +3 LED and LCD segment driver +29 PIO ports | 32 PIO ports | Up to w/ BGA package + + +## Documetation & references + - Product Page [qualcomm.com](https://www.qualcomm.com/products/csr8670) [pdf](./resources/csr8670/CSR8670%20%7C%20Qualcomm%20Productbrief.pdf) + - Product Brief [qualcomm.com](https://www.qualcomm.com/media/documents/files/csr8670-product-brief.pdf) [pdf](./resources/csr8670/CSR8670%20%7C%20Qualcomm%20Productpage.pdf) + - 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) + - [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) + + +## Sources + +TODO: +Chip maker, info and important takeaways. +Pros and cons. + +