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Add BHI260AP sensor hub integration for display GPIO expansion

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Added SensorLib dependency (v0.3.1) with BHI260AP GPIO firmware
for controlling display power gate, haptic driver, and touch reset
via the sensor's auxiliary GPIO pins.

Fixed beacon wake cycle triggering on cold boot — disabled pending
proper deep sleep vs cold boot discrimination.

Display status: BHI260AP begin() returns false (firmware upload
failing). CO5300 QSPI driver still cannot reach display controller.
Both issues under investigation.
This commit is contained in:
GlassOnTin 2026-03-27 13:01:20 +00:00
commit ae02c5c4af
2 changed files with 44 additions and 9 deletions
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2
Boards.h
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@ -742,7 +742,7 @@
#define HAS_BUSY true
#define HAS_TCXO true
#define HAS_DISPLAY false // CO5300 QSPI driver written but not yet functional
#define HAS_DISPLAY true
#define HAS_CONSOLE true
#define HAS_WIFI true
#define HAS_BLUETOOTH false

51
RNode_Firmware.ino
View file

@ -20,6 +20,16 @@
#if BOARD_MODEL == BOARD_TWATCH_ULT
#include "XL9555.h"
#include "CO5300.h"
// BHI260AP sensor hub — provides GPIO expansion for display/haptic/touch power
#include <SensorBHI260AP.hpp>
// Select BHI260AP GPIO firmware, then include the firmware selector
#define BOSCH_BHI260_GPIO
#include <BoschFirmware.h>
SensorBHI260AP *bhi260 = NULL;
bool bhi260_ready = false;
uint8_t bhi260_product_id = 0;
uint8_t bhi260_i2c_err = 0xFF;
#endif
#define CHANNEL_FIFO_SIZE (CONFIG_UART_BUFFER_SIZE / NUM_CHANNELS)
@ -274,15 +284,40 @@ void setup() {
xl9555_init();
xl9555_enable_lora_antenna();
// Check if this is a beacon timer wakeup — take fast path if so
if (esp_sleep_get_wakeup_cause() == ESP_SLEEP_WAKEUP_TIMER) {
beacon_wake_cycle(); // Does not return — transmits and sleeps again
}
// Beacon timer wakeup — disabled pending proper cold boot detection
// TODO: Re-enable with reliable deep sleep vs cold boot discrimination
// if (esp_sleep_get_wakeup_cause() == ESP_SLEEP_WAKEUP_TIMER) {
// beacon_wake_cycle();
// }
// Normal boot: enable display and haptics
xl9555_set(EXPANDS_DRV_EN, true);
xl9555_set(EXPANDS_DISP_EN, true);
xl9555_set(EXPANDS_TOUCH_RST, true);
// Initialize BHI260AP sensor hub with GPIO firmware
// This provides GPIO expansion for display power, haptic, and touch reset
delay(500); // Allow BHI260AP to boot after ALDO4 power-on
// Probe BHI260AP at 0x28
Wire.beginTransmission(0x28);
bhi260_i2c_err = Wire.endTransmission();
// Initialize BHI260AP with GPIO firmware
bhi260 = new SensorBHI260AP();
Wire.setClock(1000000UL); // 1MHz for firmware upload
bhi260->setPins(-1);
bhi260->setFirmware(bosch_firmware_image, bosch_firmware_size, false);
bhi260->setBootFromFlash(false);
if (bhi260->begin(Wire)) {
bhi260_ready = true;
bhi260->digitalWrite(SensorBHI260AP::M2SCX, HIGH); // DISP_EN
delay(20);
bhi260->digitalWrite(SensorBHI260AP::M2SDX, HIGH); // DISP_RST release
delay(200);
bhi260->digitalWrite(SensorBHI260AP::M2SDX, LOW); // DISP_RST pulse
delay(300);
bhi260->digitalWrite(SensorBHI260AP::M2SDX, HIGH); // DISP_RST release
delay(200);
bhi260->digitalWrite(SensorBHI260AP::M2SDI, HIGH); // TOUCH_RST
bhi260->digitalWrite(SensorBHI260AP::MCSB4, HIGH); // DRV_EN (haptic)
}
Wire.setClock(400000UL); // Restore normal I2C speed
#endif
#if HAS_BLUETOOTH || HAS_BLE == true