15b4baba28
- minimize RAM usage of all components - use both IRAM and DRAM in player component so we can buffer up to 1s on modules without SPI RAM - support fragemented pcm chunks so we can use all available RAM if there isn't a big enough block available but still enough HEAP - reinclude all components from jorgen's master branch - add custom i2s driver to get a precise timing of initial sync - change wrong usage of esp_timer for latency measurement of snapcast protocol - add player component
55 lines
2.2 KiB
Ruby
55 lines
2.2 KiB
Ruby
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/* Web socket object for Merus Audio EVK interface platform
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Handles communication between Web browser, interface board and amplifer */
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Interface Protocol
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Protocol : <function> <length> [<subfunction>,<parameter>,...]
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<function> := IF Function (0), // Get IF type and version (RPI|ESP32)
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// Scan I2C bus (return list of connected
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// devices with hardware IDs, protocol)
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Device communication (1), // I2C device communication read/write - byte/block
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GPIO (2), // Get/set 16 gpio's
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Audio generator (3), // Control local audio generator, input selector/routing
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Audio processor (4), // Control signal processor
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Production test (5) // Control test system
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For each function a set of subfunction are defined :
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// <subfunction> :=
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// IF functions (0),
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// 0 : Return IF type and version <RPIZ, RPI2, RPI3, ESP32, ESP32W>, <x.z>
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// 1 : Scan I2C bus Address 0x20, 0x21, 0x22 and 0x23 and turn connected devices HWID + <gen1|gen2>
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// 2 : Config Station mode: Access point, password
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// 3 : Boot to Station Mode
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// 4 : Boot to AP mode
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// Device communication (1),<subfunction><i2c_addr><prot><addr high><addr low>[<value>|<numberOfByteRead>]
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// 0 : byte write,
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// 1 : byte read,
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// 2 : block write, data
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// 3 : block read, number of bytes
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// 16 : Return modulation, powermode and system monitors
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// GPIO (2),
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// 0 : read bit number <0-15>
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// 1 : write bit number <0-15>
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// 2 : read bank 0, 8 bits
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// 3 : read bank 1, 8 bits
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// 4 : write bank 0, 8 bits
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// 5 : write bank 1, 8 bits
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// Audio generator (3),
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// 0 : Mute/unmute ch0,ch1,ch2,ch3
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// 1 : set freq, channel, freq
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// 2 : set level channel, level
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// 3 : set source, channel , <sine, noise, player>
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// 4 : set offset trim : <ch0|ch1, value>
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// Audio processor (4),
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// tbd
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// Production test (5),
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// 0 : All off
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// 1 : start test retrun pid or 0
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// 2 : set test parameters <strlen 2 bytes>
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