tangnano20k.h

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#pragma once
 
// Sipeed Tang Nano 20K (RISC-V softcore, zephyr-sdk toolchain):
// int32_t is defined as long, so we need a dedicated int constructor
#define USE_INT24_FROM_INT
 
// I2S: onboard MAX98357A; pins are defined by the gateware
#define USE_I2S
// ring buffer of 512 stereo 16 bit frames: this fits into the fast SRAM
#undef I2S_BUFFER_SIZE
#define I2S_BUFFER_SIZE 512
#undef I2S_BUFFER_COUNT
#define I2S_BUFFER_COUNT 4
 
#define USE_TIMER
 
// PWM: with Tools > PWM Audio: Enabled we use the PWMAudio hardware on
// GPIO16/GPIO17, otherwise analogWrite() on up to 6 pins starting at GPIO0
#define USE_PWM
#define PIN_PWM_START 14
#define PIN_PWM_COUNT 6
#undef PWM_AUDIO_FREQUENCY
#define PWM_AUDIO_FREQUENCY 50000
 
// There is not FPU
#define PREFER_FIXEDPOINT true
 
// SD: the core bundles the standard Arduino SD library (no fs namespace);
// the onboard microSD card uses SS as chip select (Tools > SD Card: Enabled)
#define USE_SD_NO_NS
#define PIN_CS SS