mirror of
https://github.com/markqvist/RNode_Firmware.git
synced 2026-04-27 22:35:36 +00:00
09d1f6409f
Board definition (BOARD_TWATCH_ULT = 0x45) for LilyGo T-Watch Ultra with verified pin mapping from LilyGoLib hardware docs. Working subsystems: - SX1262 LoRa radio: online at 868 MHz, tested with rnsd/Reticulum - AXP2101 PMU: all power rails configured, battery monitoring, charging - MIA-M10Q GPS: UART at 38400 baud, TinyGPSPlus NMEA parsing - PCF85063A RTC: time read/write, GPS sync infrastructure - XL9555 GPIO expander: I2C driver, LoRa antenna switch - BLE: initialized, KISS protocol responsive - Deep sleep: button wake (PMU IRQ GPIO 7), timer wake for beacon - Beacon sleep cycle: periodic wake for GPS beacon TX in standalone mode New files: - VISION.md: R-Watch product vision document - XL9555.h: minimal I2C GPIO expander driver - CO5300.h: QSPI AMOLED display driver (not yet functional) Display driver (CO5300.h) is written but disabled (HAS_DISPLAY=false). QSPI init succeeds but pixel writes don't reach the display controller. Suspected XL9555/BHI260AP GPIO expander pin mapping issue under investigation.
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
// XL9555 I2C GPIO Expander - Minimal driver for T-Watch Ultra
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// Two 8-bit ports (0-7 = port 0, 8-15 = port 1)
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// Registers: 0x00/0x01 input, 0x02/0x03 output, 0x06/0x07 direction (1=input, 0=output)
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#ifndef XL9555_H
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#define XL9555_H
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#include <Wire.h>
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#define XL9555_ADDR 0x20
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#define XL9555_REG_IN0 0x00
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#define XL9555_REG_IN1 0x01
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#define XL9555_REG_OUT0 0x02
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#define XL9555_REG_OUT1 0x03
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#define XL9555_REG_DIR0 0x06
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#define XL9555_REG_DIR1 0x07
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// T-Watch Ultra expander pin assignments (matching LilyGoLib numbering)
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#define EXPANDS_DRV_EN 6 // Port 0, bit 6 — haptic driver enable
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#define EXPANDS_DISP_EN 14 // Port 1, bit 6 — display power gate
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#define EXPANDS_DISP_RST 15 // Port 1, bit 7 — display reset
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#define EXPANDS_TOUCH_RST 16 // Extended pin — touch panel reset
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#define EXPANDS_SD_DET 12 // Port 1, bit 4 — SD card detect (input)
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#define EXPANDS_LORA_RF_SW 11 // Port 1, bit 3 — LoRa RF switch
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static bool xl9555_ready = false;
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static uint8_t xl9555_out[2] = {0xFF, 0xFF}; // output register cache
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static uint8_t xl9555_read_reg(uint8_t reg) {
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Wire.beginTransmission(XL9555_ADDR);
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Wire.write(reg);
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Wire.endTransmission(false);
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Wire.requestFrom((uint8_t)XL9555_ADDR, (uint8_t)1);
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return Wire.available() ? Wire.read() : 0xFF;
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}
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static void xl9555_write_reg(uint8_t reg, uint8_t val) {
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Wire.beginTransmission(XL9555_ADDR);
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Wire.write(reg);
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Wire.write(val);
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Wire.endTransmission();
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}
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bool xl9555_init() {
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Wire.beginTransmission(XL9555_ADDR);
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if (Wire.endTransmission() != 0) return false;
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// Set output pin directions (0 = output, 1 = input)
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// Port 0: pin 6 (DRV_EN) as output, rest input
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uint8_t dir0 = 0xFF & ~(1 << 6);
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// Port 1: pins 3 (LORA_RF_SW), 6 (DISP_EN), 7 (DISP_RST) as output
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uint8_t dir1 = 0xFF & ~((1 << 3) | (1 << 6) | (1 << 7));
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xl9555_write_reg(XL9555_REG_DIR0, dir0);
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xl9555_write_reg(XL9555_REG_DIR1, dir1);
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// Read current output state
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xl9555_out[0] = xl9555_read_reg(XL9555_REG_OUT0);
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xl9555_out[1] = xl9555_read_reg(XL9555_REG_OUT1);
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xl9555_ready = true;
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return true;
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}
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void xl9555_set(uint8_t pin, bool value) {
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if (!xl9555_ready) return;
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uint8_t port = (pin >= 8) ? 1 : 0;
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uint8_t bit = pin % 8;
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if (value) {
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xl9555_out[port] |= (1 << bit);
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} else {
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xl9555_out[port] &= ~(1 << bit);
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}
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xl9555_write_reg(port == 0 ? XL9555_REG_OUT0 : XL9555_REG_OUT1, xl9555_out[port]);
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}
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bool xl9555_get(uint8_t pin) {
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if (!xl9555_ready) return false;
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uint8_t port = (pin >= 8) ? 1 : 0;
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uint8_t bit = pin % 8;
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uint8_t val = xl9555_read_reg(port == 0 ? XL9555_REG_IN0 : XL9555_REG_IN1);
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return (val >> bit) & 1;
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}
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// Convenience functions for sleep entry
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void xl9555_sleep_prepare() {
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if (!xl9555_ready) return;
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xl9555_set(EXPANDS_DISP_RST, false); // hold display in reset
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xl9555_set(EXPANDS_DRV_EN, false); // disable haptic
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xl9555_set(EXPANDS_DISP_EN, false); // gate display power
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}
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void xl9555_wake_display() {
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if (!xl9555_ready) return;
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xl9555_set(EXPANDS_DISP_EN, true); // enable display power
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xl9555_set(EXPANDS_DISP_RST, false); // reset pulse
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delay(50);
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xl9555_set(EXPANDS_DISP_RST, true);
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}
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void xl9555_enable_lora_antenna() {
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xl9555_set(EXPANDS_LORA_RF_SW, true); // select built-in antenna
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}
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#endif
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