Stefan Kratochwil
5f9bdb2517
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66 lines
1.5 KiB
Python
66 lines
1.5 KiB
Python
# SPDX-License-Identifier: MIT
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# Copyright (c) 2025 Matthias Blankertz <matthias@blankertz.org>
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import machine
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from machine import Pin
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# SD Card SPI
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SD_DI = Pin.board.GP3
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SD_DO = Pin.board.GP4
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SD_SCK = Pin.board.GP2
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SD_CS = Pin.board.GP5
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SD_CLOCKRATE = 16000000
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# MAX98357
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I2S_LRCLK = Pin.board.GP6
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I2S_DCLK = Pin.board.GP7
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I2S_DIN = Pin.board.GP8
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I2S_SD = Pin.board.GP9
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# RC522
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RC522_SPIID = 1
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RC522_RST = Pin.board.GP14
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RC522_IRQ = Pin.board.GP15
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RC522_MOSI = Pin.board.GP11
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RC522_MISO = Pin.board.GP12
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RC522_SCK = Pin.board.GP10
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RC522_SS = Pin.board.GP13
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# WS2812
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LED_DIN = Pin.board.GP16
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LED_COUNT = 1
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# Buttons
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BUTTON_VOLUP = Pin.board.GP17
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BUTTON_VOLDOWN = Pin.board.GP19
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BUTTON_NEXT = Pin.board.GP18
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BUTTON_POWER = Pin.board.GP21
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# Power
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POWER_EN = Pin.board.GP22
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VBAT_ADC = Pin.board.GP26
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def board_init():
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# Keep power turned on
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# TODO: Implement soft power off
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POWER_EN.init(mode=Pin.OUT)
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POWER_EN.value(1)
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# SD_DO / MISO input doesn't need any special configuration
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# Set 8 mA drive strength for SCK and MOSI
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machine.mem32[0x4001c004 + 2*4] = 0x71 # SCK
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machine.mem32[0x4001c004 + 3*4] = 0x71 # MOSI
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# SD_CS doesn't need any special configuration
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# Permanently enable amplifier
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# TODO: Implement amplifier power management
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I2S_SD.init(mode=Pin.OPEN_DRAIN)
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I2S_SD.value(1)
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def get_battery_voltage():
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adc = machine.ADC(VBAT_ADC) # create ADC object on ADC pin
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battv = adc.read_u16()/65535.0*3.3*2
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return battv
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