Andrew YongandGitHub
026213aab7
Integrate STM32 battery monitoring into AnalogBatteryLevel, supporting external GPIO ADC pins as well as internal VBAT channel. Features: - ADC reading using STM32 LL (Lower Layer) macros supporting external ADC channels and internal VBAT channel (AVBAT) - ADC compensation using STM32 LL macros with factory-calibrated VREFINT (AVREF) for accurate voltage measurement - LFP battery OCV curve for STM32WL using AVBAT (STM32 VDD absolute maximum supply voltage 3.9V, direct connection of Li-Po batteries is not supported) Internal VBAT channel implemented in: - Russell - RAK3172 In these variants, ADC_MULTIPLIER = (1.01f * 3) = 3.30 as there is a 3:1 internal divider (DS13105 Rev 12 §5.3.21), and a bit of tolerance as the actual 10% spec leads to readings much too high. Assisted-by: Claude:sonnet-4-5 Signed-off-by: Andrew Yong <me@ndoo.sg>
28 lines
600 B
C
28 lines
600 B
C
/*
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STM32WLE5 Core Module for LoRaWAN® RAK3372
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https://store.rakwireless.com/products/wisblock-core-module-rak3372
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*/
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/*
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This variant is a work in progress.
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Do not expect a working Meshtastic device with this target.
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*/
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#ifndef _VARIANT_RAK3172_
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#define _VARIANT_RAK3172_
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#define USE_STM32WLx
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#define LED_POWER PA0 // Green LED
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#define LED_STATE_ON 1
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#define BATTERY_PIN AVBAT
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// ADC_MULTIPLIER: 3.0 = internal 1:3 bridge divider (DS13105§3.18.3)
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// Margin: 1.10 = AVBAT divider tolerance ±10% (Table 82)
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#define ADC_MULTIPLIER (1.01f * 3)
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#define RAK3172
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#define SERIAL_PRINT_PORT 1
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#endif
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