diff --git a/lib/CMT2300a/cmt_spi3.c b/lib/CMT2300a/cmt_spi3.cpp
similarity index 74%
rename from lib/CMT2300a/cmt_spi3.c
rename to lib/CMT2300a/cmt_spi3.cpp
index aeae3d4..aaf00fc 100644
--- a/lib/CMT2300a/cmt_spi3.c
+++ b/lib/CMT2300a/cmt_spi3.cpp
@@ -15,7 +15,7 @@ SemaphoreHandle_t paramLock = NULL;
 
 spi_device_handle_t spi_reg, spi_fifo;
 
-void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin_cs, const int8_t pin_fcs, const uint32_t spi_speed)
+void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin_cs, const int8_t pin_fcs, const int32_t spi_speed)
 {
     paramLock = xSemaphoreCreateMutex();
 
@@ -25,24 +25,32 @@ void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin
         .sclk_io_num = pin_clk,
         .quadwp_io_num = -1,
         .quadhd_io_num = -1,
+        .data4_io_num = -1,
+        .data5_io_num = -1,
+        .data6_io_num = -1,
+        .data7_io_num = -1,
         .max_transfer_sz = 32,
+        .flags = 0,
+        .intr_flags = 0,
     };
+    ESP_ERROR_CHECK(spi_bus_initialize(SPI_CMT, &buscfg, SPI_DMA_DISABLED));
+
     spi_device_interface_config_t devcfg = {
         .command_bits = 1,
         .address_bits = 7,
         .dummy_bits = 0,
         .mode = 0, // SPI mode 0
+        .duty_cycle_pos = 0,
         .cs_ena_pretrans = 1,
         .cs_ena_posttrans = 1,
         .clock_speed_hz = spi_speed,
+        .input_delay_ns = 0,
         .spics_io_num = pin_cs,
         .flags = SPI_DEVICE_HALFDUPLEX | SPI_DEVICE_3WIRE,
         .queue_size = 1,
-        .pre_cb = NULL,
-        .post_cb = NULL,
+        .pre_cb = nullptr,
+        .post_cb = nullptr,
     };
-
-    ESP_ERROR_CHECK(spi_bus_initialize(SPI_CMT, &buscfg, SPI_DMA_DISABLED));
     ESP_ERROR_CHECK(spi_bus_add_device(SPI_CMT, &devcfg, &spi_reg));
 
     // FiFo
@@ -51,14 +59,16 @@ void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin
         .address_bits = 0,
         .dummy_bits = 0,
         .mode = 0, // SPI mode 0
+        .duty_cycle_pos = 0,
         .cs_ena_pretrans = 2,
-        .cs_ena_posttrans = (uint8_t)(2 * spi_speed / 1000000), // >2 us
+        .cs_ena_posttrans = static_cast<uint8_t>(2 * spi_speed / 1000000), // >2 us
         .clock_speed_hz = spi_speed,
+        .input_delay_ns = 0,
         .spics_io_num = pin_fcs,
         .flags = SPI_DEVICE_HALFDUPLEX | SPI_DEVICE_3WIRE,
         .queue_size = 1,
-        .pre_cb = NULL,
-        .post_cb = NULL,
+        .pre_cb = nullptr,
+        .post_cb = nullptr,
     };
     ESP_ERROR_CHECK(spi_bus_add_device(SPI_CMT, &devcfg2, &spi_fifo));
 }
@@ -66,11 +76,14 @@ void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin
 void cmt_spi3_write(const uint8_t addr, const uint8_t data)
 {
     spi_transaction_t t = {
+        .flags = 0,
         .cmd = 0,
         .addr = addr,
         .length = 8,
+        .rxlength = 0,
+        .user = nullptr,
         .tx_buffer = &data,
-        .rx_buffer = NULL
+        .rx_buffer = nullptr,
     };
     SPI_PARAM_LOCK();
     ESP_ERROR_CHECK(spi_device_polling_transmit(spi_reg, &t));
@@ -81,11 +94,14 @@ uint8_t cmt_spi3_read(const uint8_t addr)
 {
     uint8_t data;
     spi_transaction_t t = {
+        .flags = 0,
         .cmd = 1,
         .addr = addr,
+        .length = 0,
         .rxlength = 8,
-        .tx_buffer = NULL,
-        .rx_buffer = &data
+        .user = nullptr,
+        .tx_buffer = nullptr,
+        .rx_buffer = &data,
     };
     SPI_PARAM_LOCK();
     ESP_ERROR_CHECK(spi_device_polling_transmit(spi_reg, &t));
@@ -96,8 +112,14 @@ uint8_t cmt_spi3_read(const uint8_t addr)
 void cmt_spi3_write_fifo(const uint8_t* buf, const uint16_t len)
 {
     spi_transaction_t t = {
+        .flags = 0,
+        .cmd = 0,
+        .addr = 0,
         .length = 8,
-        .rx_buffer = NULL
+        .rxlength = 0,
+        .user = nullptr,
+        .tx_buffer = nullptr,
+        .rx_buffer = nullptr,
     };
 
     SPI_PARAM_LOCK();
@@ -113,8 +135,14 @@ void cmt_spi3_write_fifo(const uint8_t* buf, const uint16_t len)
 void cmt_spi3_read_fifo(uint8_t* buf, const uint16_t len)
 {
     spi_transaction_t t = {
+        .flags = 0,
+        .cmd = 0,
+        .addr = 0,
+        .length = 0,
         .rxlength = 8,
-        .tx_buffer = NULL
+        .user = nullptr,
+        .tx_buffer = nullptr,
+        .rx_buffer = nullptr,
     };
 
     SPI_PARAM_LOCK();
diff --git a/lib/CMT2300a/cmt_spi3.h b/lib/CMT2300a/cmt_spi3.h
index 6d3a67b..16655db 100644
--- a/lib/CMT2300a/cmt_spi3.h
+++ b/lib/CMT2300a/cmt_spi3.h
@@ -3,7 +3,11 @@
 
 #include <stdint.h>
 
-void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin_cs, const int8_t pin_fcs, const uint32_t spi_speed);
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void cmt_spi3_init(const int8_t pin_sdio, const int8_t pin_clk, const int8_t pin_cs, const int8_t pin_fcs, const int32_t spi_speed);
 
 void cmt_spi3_write(const uint8_t addr, const uint8_t dat);
 uint8_t cmt_spi3_read(const uint8_t addr);
@@ -11,4 +15,8 @@ uint8_t cmt_spi3_read(const uint8_t addr);
 void cmt_spi3_write_fifo(const uint8_t* p_buf, const uint16_t len);
 void cmt_spi3_read_fifo(uint8_t* p_buf, const uint16_t len);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif