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Fix battery level code in adafruit_ble.cpp (#6648)

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* Fix battery level code in adafruit_ble.cpp

The code in tsk_core/protocol/lufa/adafluit_ble.cpp that polls the
battery level for the Adafruit feather BLE controller reads the
regulated voltage, not the raw voltage coming from the battery. To do
that, the Adafruit Feather docs say you should read from pin A9:
https://learn.adafruit.com/adafruit-feather-32u4-basic-proto/power-management#measuring-battery-4-9.
(See also
https://learn.adafruit.com/adafruit-feather-32u4-bluefruit-le/pinouts#logic-pins-2-9.)

I'm not sure why, but analogRead(9); doesn't read the correct pin.
Checking all available analog pins experimentally, it turns out that
analogRead(7); returns the correct value. So the code above should read:

    state.vbat = analogRead(7);

* Update tmk_core/protocol/lufa/adafruit_ble.cpp

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Remove old comment

* Fix linking error

* Remove `#ifdef` around `#include analog.h`.

* Really fix linking error
This commit is contained in:
bwhelm 2019-09-03 14:29:23 -04:00 committed by fauxpark
parent e6a6b1f122
commit fa71c4c91e
3 changed files with 16 additions and 6 deletions
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6
drivers/avr/analog.h
View file

@ -19,9 +19,15 @@
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
void analogReference(uint8_t mode);
int16_t analogRead(uint8_t pin);
int16_t adc_read(uint8_t mux);
#ifdef __cplusplus
}
#endif
#define ADC_REF_POWER (1 << REFS0)
#define ADC_REF_INTERNAL ((1 << REFS1) | (1 << REFS0))

2
tmk_core/protocol/lufa.mk
View file

@ -29,6 +29,7 @@ ifeq ($(strip $(BLUETOOTH_ENABLE)), yes)
endif
ifeq ($(strip $(BLUETOOTH)), AdafruitBLE)
LUFA_SRC += analog.c
LUFA_SRC += $(LUFA_DIR)/adafruit_ble.cpp
endif
@ -51,6 +52,7 @@ SRC += $(LUFA_SRC)
# Search Path
VPATH += $(TMK_PATH)/$(LUFA_DIR)
VPATH += $(LUFA_PATH)
VPATH += $(DRIVER_PATH)/avr
# Option modules
#ifdef $(or MOUSEKEY_ENABLE, PS2_MOUSE_ENABLE)

14
tmk_core/protocol/lufa/adafruit_ble.cpp
View file

@ -10,6 +10,7 @@
#include "action_util.h"
#include "ringbuffer.hpp"
#include <string.h>
#include "analog.h"
// These are the pin assignments for the 32u4 boards.
// You may define them to something else in your config.h
@ -29,6 +30,12 @@
#define SAMPLE_BATTERY
#define ConnectionUpdateInterval 1000 /* milliseconds */
#ifdef SAMPLE_BATTERY
#ifndef BATTERY_LEVEL_PIN
# define BATTERY_LEVEL_PIN 7
#endif
#endif
static struct {
bool is_connected;
bool initialized;
@ -631,15 +638,10 @@ void adafruit_ble_task(void) {
}
#ifdef SAMPLE_BATTERY
// I don't know if this really does anything useful yet; the reported
// voltage level always seems to be around 3200mV. We may want to just rip
// this code out.
if (timer_elapsed(state.last_battery_update) > BatteryUpdateInterval && resp_buf.empty()) {
state.last_battery_update = timer_read();
if (at_command_P(PSTR("AT+HWVBAT"), resbuf, sizeof(resbuf))) {
state.vbat = atoi(resbuf);
}
state.vbat = analogRead(BATTERY_LEVEL_PIN);
}
#endif
}