mini6ch: add the secondary TunerStudio channel for Bluetooth

The board had no secondary channel at all. Every line of it sits behind
#ifdef TS_SECONDARY_UxART_PORT and no Mazduino board defined that, so the
binarySerial pins in TunerStudio were inert and the ECU never wrote a byte
towards a Bluetooth module - the module still paired and still looked
connected, because that is between the module and the phone.

Uses the ChibiOS Serial driver on USART3 (SD3), the way the reference
f407-discovery board does it. The UART driver would have needed
HAL_USE_UART, and halconf.h only turns that on when TS_PRIMARY_UxART_PORT
is defined - upstream rusEFI has the same condition, which is why upstream
never hit it: no board there drives a secondary channel off the UART driver.

Pin defaults are PB10/PB11 (TXD3/RXD3 on this board). rusEFI's own defaults
are PC10/PC11, which every Mazduino board uses for the SD card on SPI3.
PB10/PB11 are free on mini6ch; on mazduino-lite and -core they carry the
LPS25 baro, so this is not portable to those boards as-is.

Baud follows tunerStudioSerialSpeed, 38400 by default, and the channel is
started once at boot - changing that value needs an ECU restart, not just a
burn. 38400 is also where HC-05 and JDY modules stop keeping up: 115200 was
tried on hardware and broke config page reads outright, because the limit is
SPP forwarding rather than the UART.

Costs 3.4KB of flash and no RAM. mazduino-mini6ch-bigfuel picks it up too,
sharing the same board.mk.

Author: amrikarisma

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to Mazduino firmware are documented here.
 - LTFT trim map now has its own axes (`ltftLoadBins` / `ltftRpmBins`) instead of borrowing the VE table axes. Every board gains these two fields, so all boards need a matching firmware and INI; table dimensions are unchanged on existing boards, so tune values still carry over
 
 ### Added
+- mazduino-mini6ch: secondary TunerStudio channel on USART3 (PB10 = TXD3, PB11 = RXD3), for a Bluetooth module such as an HC-05. The firmware previously had no secondary channel at all — the whole thing is behind `#ifdef TS_SECONDARY_UxART_PORT` and no Mazduino board defined it, so the `binarySerial` pins in TunerStudio did nothing and the ECU never sent a byte to the module. Uses the ChibiOS Serial driver (SD3), the same way the reference f407-discovery board does; the UART driver would need `HAL_USE_UART`, which halconf.h only enables when `TS_PRIMARY_UxART_PORT` is defined. Pin defaults are PB10/PB11 because rusEFI's own defaults, PC10/PC11, are the SD card's SPI3 pins on every Mazduino board. Baud follows `tunerStudioSerialSpeed` (38400 by default), and the channel is started once at boot, so changing that value needs an ECU restart, not just a burn. Applies to mazduino-mini6ch-bigfuel too
 - BIGFUEL board variants: `mazduino-compact-bigfuel`, `mazduino-core-bigfuel`, `mazduino-lite-bigfuel` and `mazduino-mini6ch-bigfuel`. Identical hardware and pinout to the board they are named after, with a 32x32 VE table and 32x32 ignition table (stock boards stay 16x16) for finer resolution on high-output builds. Tunes are not interchangeable between a board and its BIGFUEL variant
 - BIGFUEL variants trade the engine sniffer for the bigger tables: the persistent config lives in the 64KB CCM RAM and its leftovers feed the Lua heap, so 32x32 tables overflowed CCM by ~1.4KB. Disabling the engine sniffer frees its 5000-byte `WAVE_LOGGING_BUFFER` from CCM. All other features are unchanged from the base board — the real-time trigger oscilloscope in TunerStudio is the only thing missing
 - Separate `LTFT_LOAD_COUNT` / `LTFT_RPM_COUNT` sizing for the long-term fuel trim map, independent of the VE table. The learned trim map stays 16x16 even on BIGFUEL boards, saving 6KB of RAM versus following a 32x32 VE table, with no loss of tuning resolution. LTFT trims are now interpolated onto the VE table when applied, so the two grids no longer have to match

boards/mazduino-mini6ch/board.mk

@@ -16,6 +16,17 @@ endif
 # the flash-size register, and both parts are 1MB, so they match. Both chips
 # run at 168MHz, keeping USB 48MHz exact (PLLN=336, PLLQ=7).
 
+# Secondary TunerStudio channel on USART3 (PB10 = TXD3, PB11 = RXD3), for a
+# Bluetooth module such as an HC-05. Without TS_SECONDARY_UxART_PORT the whole
+# secondary channel is compiled out (tunerstudio_io_serial_ports.cpp) and the
+# binarySerial pins in TunerStudio do nothing at all.
+#
+# Uses the ChibiOS Serial driver (SD3), matching how the reference f407-discovery
+# board wires up its secondary channel. The UART driver would need HAL_USE_UART,
+# which halconf.h only turns on when TS_PRIMARY_UxART_PORT is defined.
+DDEFS += -DSTM32_SERIAL_USE_USART3=TRUE -DSTM32_SERIAL_USART3_PRIORITY=6
+DDEFS += -DTS_SECONDARY_UxART_PORT=SD3 -DEFI_TS_SECONDARY_IS_SERIAL=TRUE
+
 DDEFS += -DEFI_WIDEBAND_FIRMWARE_UPDATE=FALSE
 DDEFS += -DRAM_UNUSED_SIZE=100
 DDEFS += -DSTM32_ADC_USE_ADC3=TRUE

boards/mazduino-mini6ch/board_configuration.cpp

@@ -78,6 +78,14 @@ static void customBoardDefaultConfiguration() {
     engineConfiguration->canTxPin = Gpio::D1;
     engineConfiguration->canRxPin = Gpio::D0;
 
+    // Secondary TS channel (Bluetooth) on USART3. rusEFI defaults these to
+    // PC10/PC11, which this board uses for the SD card on SPI3, so the default
+    // would collide. PB10/PB11 are free on mini6ch (mazduino-lite and -core use
+    // them for the LPS25 baro; mini6ch has no baro fitted).
+    // Wiring: PB10 -> HC-05 RXD, PB11 <- HC-05 TXD.
+    engineConfiguration->binarySerialTxPin = Gpio::B10;
+    engineConfiguration->binarySerialRxPin = Gpio::B11;
+
     // SD card - SPI3
     engineConfiguration->is_enabled_spi_3  = true;
     engineConfiguration->spi3mosiPin        = Gpio::C12;

generated/controllers/generated/page_4_generated.h

@@ -12,92 +12,92 @@ struct page4_s {
 	scaled_channel<uint16_t, 10, 1> secondVeTable[VE_LOAD_COUNT][VE_RPM_COUNT] = {};
 	/**
 	 * units: {bitStringValue(veLoadUnitLabels, veLoadUnitIdxPcv)}
-	 * offset 2048
+	 * offset 512
 	 */
 	uint16_t secondVeLoadBins[VE_LOAD_COUNT] = {};
 	/**
 	 * units: RPM
-	 * offset 2112
+	 * offset 544
 	 */
 	uint16_t secondVeRpmBins[VE_RPM_COUNT] = {};
 	/**
 	 * Pin that activates the second VE table (hard switch, overrides blend)
-	 * offset 2176
+	 * offset 576
 	 */
 	switch_input_pin_e secondVeTableInput;
 	/**
-	 * offset 2178
+	 * offset 578
 	 */
 	pin_input_mode_e secondVeTableInputMode;
 	/**
 	 * Input that controls the blend ratio between primary and second VE table
-	 * offset 2179
+	 * offset 579
 	 */
 	gppwm_channel_e secondVeBlendParameter;
 	/**
-	 * offset 2180
+	 * offset 580
 	 */
 	scaled_channel<int16_t, 10, 1> secondVeBlendBins[BLEND_FACTOR_SIZE] = {};
 	/**
 	 * units: %
-	 * offset 2196
+	 * offset 596
 	 */
 	scaled_channel<uint8_t, 2, 1> secondVeBlendValues[BLEND_FACTOR_SIZE] = {};
 	/**
 	 * units: deg
-	 * offset 2204
+	 * offset 604
 	 */
 	scaled_channel<int16_t, 10, 1> secondIgnitionTable[IGN_LOAD_COUNT][IGN_RPM_COUNT] = {};
 	/**
 	 * units: {bitStringValue(ignLoadUnitLabels, ignLoadUnitIdxPcv)}
-	 * offset 4252
+	 * offset 1116
 	 */
 	uint16_t secondIgnitionLoadBins[IGN_LOAD_COUNT] = {};
 	/**
 	 * units: RPM
-	 * offset 4316
+	 * offset 1148
 	 */
 	uint16_t secondIgnitionRpmBins[IGN_RPM_COUNT] = {};
 	/**
 	 * Pin that activates the second ignition table (hard switch, overrides blend)
-	 * offset 4380
+	 * offset 1180
 	 */
 	switch_input_pin_e secondIgnitionTableInput;
 	/**
-	 * offset 4382
+	 * offset 1182
 	 */
 	pin_input_mode_e secondIgnitionTableInputMode;
 	/**
 	 * Input that controls the blend ratio between primary and second ignition table
-	 * offset 4383
+	 * offset 1183
 	 */
 	gppwm_channel_e secondIgnitionBlendParameter;
 	/**
-	 * offset 4384
+	 * offset 1184
 	 */
 	scaled_channel<int16_t, 10, 1> secondIgnitionBlendBins[BLEND_FACTOR_SIZE] = {};
 	/**
 	 * units: %
-	 * offset 4400
+	 * offset 1200
 	 */
 	scaled_channel<uint8_t, 2, 1> secondIgnitionBlendValues[BLEND_FACTOR_SIZE] = {};
 	/**
 	 * units: Nm
-	 * offset 4408
+	 * offset 1208
 	 */
 	scaled_channel<uint8_t, 1, 10> torqueTable[TORQUE_CURVE_SIZE][TORQUE_CURVE_RPM_SIZE] = {};
 	/**
 	 * units: RPM
-	 * offset 4444
+	 * offset 1244
 	 */
 	uint16_t torqueRpmBins[TORQUE_CURVE_RPM_SIZE] = {};
 	/**
 	 * units: Load
-	 * offset 4456
+	 * offset 1256
 	 */
 	uint16_t torqueLoadBins[TORQUE_CURVE_SIZE] = {};
 };
-static_assert(sizeof(page4_s) == 4468);
+static_assert(sizeof(page4_s) == 1268);
 
 // end
 // this section was generated automatically by rusEFI tool config_definition-all.jar based on gen_config.sh integration/config_page_4.txt