diff --git a/debug_registers/README.md b/debug_registers/README.md
index 6296a69..ee674c4 100644
--- a/debug_registers/README.md
+++ b/debug_registers/README.md
@@ -22,7 +22,7 @@ for (int i = 0; i < sizeof(registers); i++) {
   if (i != 0) {
     printf(",");
   }
-  printf("%d", registers[i]);
+  printf("0x%02x", registers[i]);
 }
 printf("\n");
 ```
diff --git a/examples/receive_fsk/main/main.c b/examples/receive_fsk/main/main.c
index 4afcffc..4c05904 100644
--- a/examples/receive_fsk/main/main.c
+++ b/examples/receive_fsk/main/main.c
@@ -72,9 +72,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -82,7 +82,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;   
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
@@ -120,5 +120,5 @@ void app_main() {
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_RX_CONT, SX127x_MODULATION_FSK, device));
   while (1) {
     vTaskDelay(10000 / portTICK_PERIOD_MS);
-  }
+    }
 }
diff --git a/examples/receive_fsk_beacon/main/main.c b/examples/receive_fsk_beacon/main/main.c
index be154c2..b3e2cc2 100644
--- a/examples/receive_fsk_beacon/main/main.c
+++ b/examples/receive_fsk_beacon/main/main.c
@@ -72,9 +72,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -82,7 +82,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/receive_fsk_filtered/main/main.c b/examples/receive_fsk_filtered/main/main.c
index 7ad071f..a3d1974 100644
--- a/examples/receive_fsk_filtered/main/main.c
+++ b/examples/receive_fsk_filtered/main/main.c
@@ -72,9 +72,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -82,7 +82,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/receive_fsk_fixed/main/main.c b/examples/receive_fsk_fixed/main/main.c
index 57366fc..fd2402a 100644
--- a/examples/receive_fsk_fixed/main/main.c
+++ b/examples/receive_fsk_fixed/main/main.c
@@ -72,9 +72,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -82,7 +82,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/receive_fsk_raspberrypi/main.c b/examples/receive_fsk_raspberrypi/main.c
index d52d2aa..c6d03d2 100644
--- a/examples/receive_fsk_raspberrypi/main.c
+++ b/examples/receive_fsk_raspberrypi/main.c
@@ -20,7 +20,7 @@
 #define GPIO_DIO3_PIN 26
 #define GPIO_DIO0_PIN 27
 #define GPIO_RESET_PIN 6
-#define GPIO_POLL_TIMEOUT -1
+#define GPIO_POLL_TIMEOUT (-1)
 
 #define LINUX_ERROR_CHECK(x)                                                       \
   do {                                                                             \
@@ -177,7 +177,7 @@ int main() {
     LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_BITS_PER_WORD, &bits_per_word));
     int lsb_setting = 0;  // MSB
     LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_LSB_FIRST, &lsb_setting));
-    int max_speed = 500000;
+    int max_speed = 4000000;
     LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_MAX_SPEED_HZ, &max_speed));
 
     sx127x *device = NULL;
diff --git a/examples/receive_lora/main/main.c b/examples/receive_lora/main/main.c
index 5887cf9..c1c13fc 100644
--- a/examples/receive_lora/main/main.c
+++ b/examples/receive_lora/main/main.c
@@ -79,9 +79,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 8E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -89,7 +89,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_LORA, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/receive_lora_deepsleep/main/main.c b/examples/receive_lora_deepsleep/main/main.c
index e72d57f..f6471f0 100644
--- a/examples/receive_lora_deepsleep/main/main.c
+++ b/examples/receive_lora_deepsleep/main/main.c
@@ -49,9 +49,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 8E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -59,7 +59,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
 
   esp_sleep_wakeup_cause_t cpu0WakeupReason = esp_sleep_get_wakeup_cause();
diff --git a/examples/receive_lora_implicit_header/main/main.c b/examples/receive_lora_implicit_header/main/main.c
index 939578e..7a10f0e 100644
--- a/examples/receive_lora_implicit_header/main/main.c
+++ b/examples/receive_lora_implicit_header/main/main.c
@@ -68,9 +68,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 8E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -78,7 +78,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_LORA, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/receive_lora_raspberrypi/main.c b/examples/receive_lora_raspberrypi/main.c
index b91c692..0dbde66 100644
--- a/examples/receive_lora_raspberrypi/main.c
+++ b/examples/receive_lora_raspberrypi/main.c
@@ -179,7 +179,7 @@ int main() {
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_BITS_PER_WORD, &bits_per_word));
   int lsb_setting = 0;  // MSB
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_LSB_FIRST, &lsb_setting));
-  int max_speed = 500000;
+  int max_speed = 8000000;
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_MAX_SPEED_HZ, &max_speed));
 
   sx127x *device = NULL;
diff --git a/examples/receive_ook/main/main.c b/examples/receive_ook/main/main.c
index 5559ae5..7eaaae7 100644
--- a/examples/receive_ook/main/main.c
+++ b/examples/receive_ook/main/main.c
@@ -72,9 +72,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -82,7 +82,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_OOK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/transmit_fsk/main/main.c b/examples/transmit_fsk/main/main.c
index 032834b..576a570 100644
--- a/examples/transmit_fsk/main/main.c
+++ b/examples/transmit_fsk/main/main.c
@@ -87,6 +87,7 @@ void setup_gpio_interrupts(gpio_num_t gpio, sx127x *device, gpio_int_type_t type
 
 void app_main() {
   ESP_LOGI(TAG, "starting up");
+
   spi_bus_config_t config = {
       .mosi_io_num = MOSI,
       .miso_io_num = MISO,
@@ -95,9 +96,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -105,7 +106,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/transmit_fsk_beacon/main/main.c b/examples/transmit_fsk_beacon/main/main.c
index 4a9f945..d22ee81 100644
--- a/examples/transmit_fsk_beacon/main/main.c
+++ b/examples/transmit_fsk_beacon/main/main.c
@@ -35,9 +35,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -45,7 +45,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
@@ -61,7 +61,7 @@ void app_main() {
   ESP_ERROR_CHECK(sx127x_tx_set_pa_config(SX127x_PA_PIN_BOOST, 4, device));
   ESP_ERROR_CHECK(sx127x_fsk_ook_set_crc(SX127X_CRC_CCITT, device));
 
-  uint8_t payload = {0xCA, 0xFE, 0x01, 0x02, 0xBE, 0xEF};
+  uint8_t payload[] = {0xCA, 0xFE, 0x01, 0x02, 0xBE, 0xEF};
   ESP_ERROR_CHECK(sx127x_fsk_ook_set_packet_format(SX127X_FIXED, sizeof(payload), device));
   ESP_ERROR_CHECK(sx127x_fsk_ook_tx_start_beacon(payload, sizeof(payload), 1000, device));
   vTaskDelay(10000 / portTICK_PERIOD_MS);
diff --git a/examples/transmit_fsk_fixed/main/main.c b/examples/transmit_fsk_fixed/main/main.c
index 171b176..c22d7bc 100644
--- a/examples/transmit_fsk_fixed/main/main.c
+++ b/examples/transmit_fsk_fixed/main/main.c
@@ -76,9 +76,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -86,7 +86,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_FSK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/transmit_lora/main/main.c b/examples/transmit_lora/main/main.c
index 4245e1f..5f67332 100644
--- a/examples/transmit_lora/main/main.c
+++ b/examples/transmit_lora/main/main.c
@@ -12,6 +12,9 @@
 #define SS 18
 #define RST 23
 #define DIO0 26
+// older versions of TTGO require manual wiring of pins below
+//#define DIO1 33
+//#define DIO2 32
 
 static const char *TAG = "sx127x";
 
@@ -71,9 +74,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 8E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -81,7 +84,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_LORA, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/transmit_lora_implicit_header/main/main.c b/examples/transmit_lora_implicit_header/main/main.c
index f655e91..8271baa 100644
--- a/examples/transmit_lora_implicit_header/main/main.c
+++ b/examples/transmit_lora_implicit_header/main/main.c
@@ -44,9 +44,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 8E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -54,7 +54,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));     
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_LORA, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));
diff --git a/examples/transmit_lora_raspberrypi/main.c b/examples/transmit_lora_raspberrypi/main.c
index 3766c60..6dc4bc7 100644
--- a/examples/transmit_lora_raspberrypi/main.c
+++ b/examples/transmit_lora_raspberrypi/main.c
@@ -110,7 +110,7 @@ int main() {
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_BITS_PER_WORD, &bits_per_word));
   int lsb_setting = 0;  // MSB
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_LSB_FIRST, &lsb_setting));
-  int max_speed = 500000;
+  int max_speed = 8000000;
   LINUX_ERROR_CHECK(ioctl(spi_device_fd, SPI_IOC_WR_MAX_SPEED_HZ, &max_speed));
 
   sx127x *device = NULL;
diff --git a/examples/transmit_ook/main/main.c b/examples/transmit_ook/main/main.c
index c31b59c..53f7a33 100644
--- a/examples/transmit_ook/main/main.c
+++ b/examples/transmit_ook/main/main.c
@@ -95,9 +95,9 @@ void app_main() {
       .quadhd_io_num = -1,
       .max_transfer_sz = 0,
   };
-  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &config, 1));
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &config, 1));
   spi_device_interface_config_t dev_cfg = {
-      .clock_speed_hz = 3E6,
+      .clock_speed_hz = 4E6,
       .spics_io_num = SS,
       .queue_size = 16,
       .command_bits = 0,
@@ -105,7 +105,7 @@ void app_main() {
       .dummy_bits = 0,
       .mode = 0};
   spi_device_handle_t spi_device;
-  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_cfg, &spi_device));
+  ESP_ERROR_CHECK(spi_bus_add_device(SPI2_HOST, &dev_cfg, &spi_device));
   ESP_ERROR_CHECK(sx127x_create(spi_device, &device));
   ESP_ERROR_CHECK(sx127x_set_opmod(SX127x_MODE_SLEEP, SX127x_MODULATION_OOK, device));
   ESP_ERROR_CHECK(sx127x_set_frequency(437200012, device));