diff --git a/examples/deep_sleep/main/main.cpp b/examples/deep_sleep/main/main.cpp
index 19330a9..59c79a8 100644
--- a/examples/deep_sleep/main/main.cpp
+++ b/examples/deep_sleep/main/main.cpp
@@ -74,12 +74,10 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);
 
diff --git a/examples/hello_world/main/main.cpp b/examples/hello_world/main/main.cpp
index 5e151e7..1747ab1 100644
--- a/examples/hello_world/main/main.cpp
+++ b/examples/hello_world/main/main.cpp
@@ -14,6 +14,7 @@
 #include "esp_event.h"
 #include "driver/gpio.h"
 #include "nvs_flash.h"
+#include <string.h>
 
 #include "TheThingsNetwork.h"
 
@@ -81,12 +82,10 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);
 
diff --git a/examples/mac_address/main/main.cpp b/examples/mac_address/main/main.cpp
index f4ab45e..8821536 100644
--- a/examples/mac_address/main/main.cpp
+++ b/examples/mac_address/main/main.cpp
@@ -14,6 +14,7 @@
 #include "driver/gpio.h"
 #include "esp_event.h"
 #include "nvs_flash.h"
+#include <string.h>
 
 #include "TheThingsNetwork.h"
 
@@ -74,12 +75,10 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);
 
diff --git a/examples/monitoring/main/main.cpp b/examples/monitoring/main/main.cpp
index 099eb9e..a931b0e 100644
--- a/examples/monitoring/main/main.cpp
+++ b/examples/monitoring/main/main.cpp
@@ -14,6 +14,7 @@
 #include "esp_event.h"
 #include "driver/gpio.h"
 #include "nvs_flash.h"
+#include <string.h>
 
 #include "TheThingsNetwork.h"
 
@@ -62,12 +63,12 @@ void printRFSettings(const char* window, const TTNRFSettings& settings)
     }
     else if (settings.spreadingFactor == kTTNFSK)
     {
-        printf("%s: FSK, BW %dkHz, %d.%d MHz\n",
+        printf("%s: FSK, BW %dkHz, %ld.%ld MHz\n",
                 window, bw, settings.frequency / 1000000, (settings.frequency % 1000000 + 50000) / 100000);
     }
     else
     {
-        printf("%s: SF%d, BW %dkHz, %d.%d MHz\n",
+        printf("%s: SF%d, BW %dkHz, %ld.%ld MHz\n",
                 window, sf, bw, settings.frequency / 1000000, (settings.frequency % 1000000 + 50000) / 100000);
     }
 }
@@ -113,12 +114,10 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);
 
diff --git a/examples/power_off/main/main.cpp b/examples/power_off/main/main.cpp
index 3c75acd..435231c 100644
--- a/examples/power_off/main/main.cpp
+++ b/examples/power_off/main/main.cpp
@@ -15,6 +15,7 @@
 #include "esp_sleep.h"
 #include "freertos/FreeRTOS.h"
 #include "nvs_flash.h"
+#include <string.h>
 
 #include "TheThingsNetwork.h"
 
@@ -70,12 +71,10 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);
 
diff --git a/examples/provisioning/main/main.cpp b/examples/provisioning/main/main.cpp
index 462a13a..eab8eb4 100644
--- a/examples/provisioning/main/main.cpp
+++ b/examples/provisioning/main/main.cpp
@@ -14,6 +14,7 @@
 #include "driver/gpio.h"
 #include "esp_event.h"
 #include "nvs_flash.h"
+#include <string.h>
 
 #include "TheThingsNetwork.h"
 
@@ -65,12 +66,11 @@ extern "C" void app_main(void)
 
     // Initialize SPI bus
     spi_bus_config_t spi_bus_config;
+    memset(&spi_bus_config, 0, sizeof(spi_bus_config));
     spi_bus_config.miso_io_num = TTN_PIN_SPI_MISO;
     spi_bus_config.mosi_io_num = TTN_PIN_SPI_MOSI;
     spi_bus_config.sclk_io_num = TTN_PIN_SPI_SCLK;
-    spi_bus_config.quadwp_io_num = -1;
-    spi_bus_config.quadhd_io_num = -1;
-    spi_bus_config.max_transfer_sz = 0;
+
     err = spi_bus_initialize(TTN_SPI_HOST, &spi_bus_config, TTN_SPI_DMA_CHAN);
     ESP_ERROR_CHECK(err);