Changed the sampling rate to 1kHz

EXAMPLE.md

@@ -4,7 +4,7 @@
 |-----------------|-------------------------------------------------------------------------|
 | [hello](examples/hello)  | Hello filesystem world.                                                 |
 | [fs\_inits](examples/fs_inits) | Examples of file system layout combinations.                      |
-| [multicore\_logger](examples/multicore_logger) | Multi-core 500 Hz sampling rate sensor data stored on SD card |
+| [multicore\_logger](examples/multicore_logger) | Multi-core 1kHz sampling rate sensor data stored on SD card |
 | [elastic\_mqtt\_client](examples/elastic_mqtt_client) |Implements an MQTT client with a local queue to handle network disconnections seamlessly. |
 | [usb\_logger](examples/usb_logger) | Data logger that mounts littlefs and FAT on flash memory and shares it with a PC via USB mass storage class.|
 | [benchmark](examples/benchmark)| Data transfer tests with different block devices and different file system combinations.|

examples/multicore_logger/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_executable(multicore_logger main.c fs_init.c)
+target_compile_options(multicore_logger PRIVATE -O2)
 target_link_libraries(multicore_logger PRIVATE
   pico_stdlib
   pico_util

examples/multicore_logger/main.c

@@ -15,7 +15,7 @@
 #include "filesystem/vfs.h"
 
 #if !defined(SAMPLING_RATE_HZ)
-#define SAMPLING_RATE_HZ  500
+#define SAMPLING_RATE_HZ  1000
 #endif
 
 typedef struct {
@@ -32,6 +32,8 @@ typedef struct {
 } sensor_data_t;
 
 queue_t sensor_queue;
+static char write_buffer[1024 * 64];
+
 
 static float normal_random(float mean, float stddev) {
     static bool has_spare = false;
@@ -89,6 +91,8 @@ int main(void) {
     if (fp == NULL) {
         printf("fopen failed: %s\n", strerror(errno));
     }
+    setvbuf(fp, write_buffer, _IOFBF, sizeof(write_buffer));
+
     fprintf(fp, "Time,AccelX,AccelY,AccelZ,GyroX,GyroY,GyroZ,MagX,MagY,Magz\n");
 
     multicore_reset_core1();