clean cached, add hal uart printf

Author: ch-binh

.gitignore

@@ -1 +1 @@
-**/.vscode
+**/build/**

.vscode/c_cpp_properties.json

@@ -0,0 +1,24 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "forcedInclude": [
+                "${workspaceFolder}/example/stm32/uart_data_output/Drivers/CMSIS/Device/ST/STM32F1xx/Include/stm32f103x6.h"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.22621.0",
+            "compilerPath": "cl.exe",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-msvc-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "DEBUG",
+            "cwd": "${workspaceFolder}",
+            "executable": "${workspaceFolder}\\example\\stm32\\uart_data_output\\build\\mpu6050.elf",
+            "loadFiles": [
+                "${workspaceFolder}\\example\\stm32\\uart_data_output\\build\\mpu6050.elf",
+            ],
+            "request": "launch",
+            "servertype": "jlink",
+            "type": "cortex-debug",
+            "runToEntryPoint": "main",
+            "device": "STM32F103C8",
+            "interface": "swd",
+            "v1": false,
+            "showDevDebugOutput": "parsed",
+        },
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,13 @@
+{
+    "files.associations": {
+        "main.h": "c",
+        "hal_usart.h": "c",
+        "hal_gpio.h": "c",
+        "stdint.h": "c",
+        "stm32f1xx_hal.h": "c",
+        "hal_tim.h": "c",
+        "hal_uart.h": "c",
+        "board_config.h": "c"
+    },
+    "cortex-debug.variableUseNaturalFormat": true
+}

documents/MPU-6000.PDF renamed to docs/MPU-6000.PDF

@@ -39,7 +39,7 @@ C_SOURCES =  \
 src/main.c \
 src/hal_gpio.c \
 src/hal_i2c.c \
-src/hal_uart.c \
+src/hal_usart.c \
 src/stm32f1xx_it.c \
 src/stm32f1xx_hal_msp.c \
 src/syscfg.c	\