found and tested a library for communication with the bme280

mein_projekt/CMakeLists.txt

@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.13)
+set(PICO_BOARD pico_w)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(PICO_SDK_PATH ${CMAKE_SOURCE_DIR}/../pico-sdk)
@@ -6,7 +7,6 @@ set(PICO_SDK_PATH ${CMAKE_SOURCE_DIR}/../pico-sdk)
 # Pico SDK einbinden – MUSS vor project() stehen
 include(${PICO_SDK_PATH}/external/pico_sdk_import.cmake)
 
-set(PICO_BOARD pico_w)
 
 project(mein_projekt C CXX ASM)
 set(CMAKE_C_STANDARD 11)
@@ -14,6 +14,8 @@ set(CMAKE_CXX_STANDARD 17)
 
 pico_sdk_init()
 
+add_subdirectory(../lib/bme280 bme280_build)
+
 add_executable(mein_projekt
     main.cpp
 )
@@ -26,7 +28,7 @@ pico_enable_stdio_uart(mein_projekt 0)
 target_link_libraries(mein_projekt
     pico_stdlib
     pico_cyw43_arch_none
-    hardware_i2c
+    bme280
 )
 
 # Erzeugt .uf2 Datei zum Flashen

mein_projekt/main.cpp

@@ -1,25 +1,32 @@
+#include "bme280.h"
 #include "hardware/i2c.h"
+#include "pico/cyw43_arch.h"
 #include "pico/stdlib.h"
 #include <cstdio>
 
-void check_i2c() {
-  uint8_t buffer;
-  for (int addr{0x08}; addr < 0x78; addr++) {
-    if (i2c_read_blocking(i2c0, addr, &buffer, 1, false) > 0) {
-      printf("Adresse: %02X\n", addr);
-    }
-  }
-}
+constexpr int i2cAddress{0x76};
 
 int main() {
-  sleep_ms(3000);
   stdio_init_all();
-  i2c_init(i2c0, 400 * 1000);
-  gpio_set_function(0, GPIO_FUNC_I2C); // SDA
-  gpio_set_function(1, GPIO_FUNC_I2C); // SCL
-  gpio_pull_up(0);
-  gpio_pull_up(1);
+  sleep_ms(3000);
+  cyw43_arch_init();
+
+  bme280_handle_t handle;
+  int result{bme280_init(&handle, i2cAddress, INTERVAL_1000MS)};
+  printf("I2C scan...\n");
+  for (uint8_t addr = 0x08; addr < 0x78; addr++) {
+    uint8_t dummy;
+    int ret = i2c_read_blocking(i2c1, addr, &dummy, 1, false);
+    if (ret >= 0) {
+      printf("Gefunden: 0x%02X\n", addr);
+    }
+  }
+
   while (true) {
-    check_i2c();
+    int result{bme280_init(&handle, i2cAddress, INTERVAL_1000MS)};
+    printf("Init result: %d\n", result);
+    bme280_read_data(handle);
+    printf("%s\n", bme280_get_json(handle));
+    sleep_ms(3000);
   }
 }