diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
index 4603c7d49c..8eade4e0c0 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
@@ -46,5 +46,6 @@ define HAL_STORAGE_SIZE 16384
 # Add CS pins to ensure they are high in bootloader
 PC15 IMU1_CS CS
 PB12 MAX7456_CS CS
-PD4 MS5611_CS CS
 PE11 IMU2_CS CS
+PD4 EXT_CS1 CS
+PE2 EXT_CS2 CS
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef.dat
index 62b57576e3..0209670a60 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef.dat
@@ -40,12 +40,15 @@ PB13 SPI2_SCK SPI2
 PB14 SPI2_MISO SPI2
 PB15 SPI2_MOSI SPI2
 
-# SPI3 for MS5611
-PD4 MS5611_CS CS
+# SPI3 - external
 PB3 SPI3_SCK SPI3
 PB4 SPI3_MISO SPI3
 PB5 SPI3_MOSI SPI3
 
+# external CS pins
+PD4 EXT_CS1 CS
+PE2 EXT_CS2 CS
+
 # SPI4 for IMU2 (ICM20602)
 PE11 IMU2_CS CS
 PE12 SPI4_SCK SPI4
@@ -53,7 +56,7 @@ PE13 SPI4_MISO SPI4
 PE14 SPI4_MOSI SPI4
 
 # two I2C bus
-I2C_ORDER I2C1 I2C2
+I2C_ORDER I2C2 I2C1
 
 # I2C1
 PB6 I2C1_SCL I2C1
@@ -175,17 +178,19 @@ define HAL_STORAGE_SIZE 16384
 define STORAGE_FLASH_PAGE 14
 
 # spi devices
-SPIDEV ms5611    SPI3 DEVID1 MS5611_CS    MODE3 20*MHZ 20*MHZ
-SPIDEV mpu6000  SPI1 DEVID1 IMU1_CS MODE3  1*MHZ  4*MHZ
+SPIDEV mpu6000   SPI1 DEVID1 IMU1_CS      MODE3  1*MHZ  4*MHZ
 SPIDEV icm20602  SPI4 DEVID1 IMU2_CS      MODE3  1*MHZ  4*MHZ
-SPIDEV osd      SPI2 DEVID4 MAX7456_CS  MODE0 10*MHZ 10*MHZ
+SPIDEV osd       SPI2 DEVID4 MAX7456_CS   MODE0 10*MHZ 10*MHZ
+
+# SPI3 external connections
+SPIDEV pixartflow   SPI3 DEVID1  EXT_CS1  MODE3   2*MHZ  2*MHZ
 
 # no built-in compass, but probe the i2c bus for all possible
 # external compass types
 define ALLOW_ARM_NO_COMPASS
 define HAL_COMPASS_DEFAULT HAL_COMPASS_NONE
 define HAL_PROBE_EXTERNAL_I2C_COMPASSES
-define HAL_I2C_INTERNAL_MASK 1
+define HAL_I2C_INTERNAL_MASK 0
 define HAL_COMPASS_AUTO_ROT_DEFAULT 2
 
 # two IMUs. We put icm20602 first as we can sample accel at 4kHz
@@ -193,8 +198,10 @@ IMU Invensense SPI:icm20602 ROTATION_ROLL_180_YAW_270
 IMU Invensense SPI:mpu6000 ROTATION_ROLL_180_YAW_270
 define HAL_DEFAULT_INS_FAST_SAMPLE 1
 
-# one BARO
-BARO MS56XX SPI:ms5611
+# MS5611 integrated on I2C2 bus, multiple possible choices for external barometer
+BARO MS56XX I2C:0:0x77
+BARO BMP280 I2C:0:0x76
+BARO BMP388 I2C:0:0x76
 
 define HAL_OS_FATFS_IO 1
 define HAL_BOARD_LOG_DIRECTORY "/APM/LOGS"