diff --git a/TinyFrame/TF_Config.h b/TinyFrame/TF_Config.h
index 992e9b8..42dd408 100644
--- a/TinyFrame/TF_Config.h
+++ b/TinyFrame/TF_Config.h
@@ -48,26 +48,6 @@ typedef uint8_t TF_COUNT;
 
 //----------------------------- PARAMETERS ----------------------------------
 
-// Maximum received payload size (static buffer)
-// Larger payloads will be rejected.
-#define TF_MAX_PAYLOAD_RX 640
-// Size of the sending buffer. Larger payloads will be split to pieces and sent
-// in multiple calls to the write function. This can be lowered to reduce RAM usage.
-#define TF_SENDBUF_LEN 64
-
-// --- Listener counts - determine sizes of the static slot tables ---
-
-// Frame ID listeners (wait for response / multi-part message)
-#define TF_MAX_ID_LST   4
-// Frame Type listeners (wait for frame with a specific first payload byte)
-#define TF_MAX_TYPE_LST 6
-// Generic listeners (fallback if no other listener catches it)
-#define TF_MAX_GEN_LST  1
-
-// Timeout for receiving & parsing a frame
-// ticks = number of calls to TF_Tick()
-#define TF_PARSER_TIMEOUT_TICKS 250
-
-//------------------------- End of user config ------------------------------
+// buffers, counts and timeout are defined in plat_compat.h
 
 #endif //TF_CONFIG_H
diff --git a/USB/usbd_conf.h b/USB/usbd_conf.h
index e66b34b..c029a71 100644
--- a/USB/usbd_conf.h
+++ b/USB/usbd_conf.h
@@ -76,7 +76,7 @@
 /*---------- -----------*/
 #define USBD_MAX_NUM_CONFIGURATION     1
 /*---------- -----------*/
-#define USBD_MAX_STR_DESC_SIZ     128
+//#define USBD_MAX_STR_DESC_SIZ     128 /* Moved to plat_compat.h */
 /*---------- -----------*/
 #define USBD_SUPPORT_USER_STRING     1
 /*---------- -----------*/
@@ -84,7 +84,7 @@
 /*---------- -----------*/
 #define USBD_SELF_POWERED     1
 /*---------- -----------*/
-#define MSC_MEDIA_PACKET     512
+//#define MSC_MEDIA_PACKET     512 /* Moved to plat_compat.h */
 /****************************************/
 /* #define for FS and HS identification */
 #define DEVICE_FS 		0
diff --git a/comm/messages.h b/comm/messages.h
index 8d113c2..8e0dcdf 100644
--- a/comm/messages.h
+++ b/comm/messages.h
@@ -5,13 +5,11 @@
 #ifndef GEX_MESSAGES_H
 #define GEX_MESSAGES_H
 
+#include "platform.h"
 #include "sched_queue.h"
 #include "task_sched.h"
 #include "TinyFrame.h"
 
-#define BULK_LST_TIMEOUT_MS 200
-#define BULKREAD_MAX_CHUNK  512 // this is a static buffer
-
 /**
  * Supported message types (TF_TYPE)
  */
diff --git a/comm/msg_responses.c b/comm/msg_responses.c
index 3562b02..6b5b6a4 100644
--- a/comm/msg_responses.c
+++ b/comm/msg_responses.c
@@ -2,17 +2,16 @@
 // Created by MightyPork on 2017/12/22.
 //
 
+#include "platform.h"
 #include "messages.h"
 #include "msg_responses.h"
 
 void com_respond_snprintf(TF_ID frame_id, TF_TYPE type, const char *format, ...)
 {
-#define ERR_STR_LEN 64
-
-    char buf[ERR_STR_LEN];
+    char buf[ERR_MSG_STR_LEN];
     va_list args;
     va_start(args, format);
-    uint32_t len = (uint32_t) fixup_vsnprintf(&buf[0], ERR_STR_LEN, format, args);
+    uint32_t len = (uint32_t) fixup_vsnprintf(&buf[0], ERR_MSG_STR_LEN, format, args);
     va_end(args);
 
     com_respond_buf(frame_id, type, (const uint8_t *) buf, len);
diff --git a/debug.c b/debug.c
index 7075fcb..7ef2342 100644
--- a/debug.c
+++ b/debug.c
@@ -7,8 +7,6 @@
 
 #if USE_DEBUG_UART
 
-#define DBG_BUF_LEN 80
-
 // debug printf
 int PRINTF(const char *format, ...)
 {
diff --git a/framework/settings.c b/framework/settings.c
index 62a276d..d15d4c3 100644
--- a/framework/settings.c
+++ b/framework/settings.c
@@ -2,8 +2,8 @@
 // Created by MightyPork on 2017/11/26.
 //
 
-#include "utils/hexdump.h"
 #include "platform.h"
+#include "utils/hexdump.h"
 #include "settings.h"
 #include "unit_registry.h"
 #include "system_settings.h"
@@ -47,8 +47,7 @@ void settings_load(void)
 }
 
 
-#define SAVE_BUF_SIZE 256
-static uint8_t save_buffer[SAVE_BUF_SIZE];
+static uint8_t save_buffer[FLASH_SAVE_BUF_LEN];
 static uint32_t save_addr;
 
 #if DEBUG_FLASH_WRITE
@@ -126,7 +125,7 @@ static void savebuf_flush(PayloadBuilder *pb, bool final)
  */
 static bool savebuf_ovhandler(PayloadBuilder *pb, uint32_t more)
 {
-    if (more > SAVE_BUF_SIZE) return false;
+    if (more > FLASH_SAVE_BUF_LEN) return false;
     savebuf_flush(pb, false);
     return true;
 }
@@ -135,7 +134,7 @@ static bool savebuf_ovhandler(PayloadBuilder *pb, uint32_t more)
 void settings_save(void)
 {
     HAL_StatusTypeDef hst;
-    PayloadBuilder pb = pb_start(save_buffer, SAVE_BUF_SIZE, savebuf_ovhandler);
+    PayloadBuilder pb = pb_start(save_buffer, FLASH_SAVE_BUF_LEN, savebuf_ovhandler);
 
     save_addr = SETTINGS_FLASH_ADDR;
 
diff --git a/freertos.c b/freertos.c
index eff4d89..af2b0a9 100644
--- a/freertos.c
+++ b/freertos.c
@@ -48,30 +48,26 @@
 
 /* Includes ------------------------------------------------------------------*/
 #include "FreeRTOS.h"
-#include "task.h"
 #include "cmsis_os.h"
 
-/* USER CODE BEGIN Includes */     
+/* USER CODE BEGIN Includes */
+#include "platform.h"
 #include "tasks/sched_queue.h"
 #include "stacksmon.h"
 /* USER CODE END Includes */
 
 /* Variables -----------------------------------------------------------------*/
 
-#define STACK_MAIN 160
-#define STACK_MSG 200
-#define STACK_JOBRUNNER 128
-
 osThreadId tskMainHandle;
-uint32_t mainTaskBuffer[ STACK_MAIN ];
+uint32_t mainTaskBuffer[ TSK_STACK_MAIN ];
 osStaticThreadDef_t mainTaskControlBlock;
 
 osThreadId tskMsgHandle;
-uint32_t msgTaskBuffer[ STACK_MSG ];
+uint32_t msgTaskBuffer[ TSK_STACK_MSG ];
 osStaticThreadDef_t msgTaskControlBlock;
 
 osThreadId tskJobRunnerHandle;
-uint32_t jobRunnerBuffer[ STACK_JOBRUNNER ];
+uint32_t jobRunnerBuffer[ TSK_STACK_JOBRUNNER ];
 osStaticThreadDef_t jobRunnerControlBlock;
 
 osMessageQId queSchedHandle;
@@ -166,15 +162,15 @@ void MX_FREERTOS_Init(void) {
 
   /* Create the thread(s) */
   /* definition and creation of tskMain */
-  osThreadStaticDef(tskMain, TaskMain, osPriorityHigh, 0, STACK_MAIN, mainTaskBuffer, &mainTaskControlBlock);
+  osThreadStaticDef(tskMain, TaskMain, osPriorityHigh, 0, TSK_STACK_MAIN, mainTaskBuffer, &mainTaskControlBlock);
   tskMainHandle = osThreadCreate(osThread(tskMain), NULL);
 
   /* definition and creation of tskJobRunner */
-  osThreadStaticDef(tskJobRunner, TaskJobQueue, osPriorityAboveNormal, 0, STACK_JOBRUNNER, jobRunnerBuffer, &jobRunnerControlBlock);
+  osThreadStaticDef(tskJobRunner, TaskJobQueue, osPriorityAboveNormal, 0, TSK_STACK_JOBRUNNER, jobRunnerBuffer, &jobRunnerControlBlock);
   tskJobRunnerHandle = osThreadCreate(osThread(tskJobRunner), NULL);
 
   /* definition and creation of TaskMessaging */
-  osThreadStaticDef(tskMsg, TaskMessaging, osPriorityNormal, 0, STACK_MSG, msgTaskBuffer, &msgTaskControlBlock);
+  osThreadStaticDef(tskMsg, TaskMessaging, osPriorityNormal, 0, TSK_STACK_MSG, msgTaskBuffer, &msgTaskControlBlock);
   tskMsgHandle = osThreadCreate(osThread(tskMsg), NULL);
 
   /* USER CODE BEGIN RTOS_THREADS */
diff --git a/platform/plat_compat.h b/platform/plat_compat.h
index 7462094..aa4437c 100644
--- a/platform/plat_compat.h
+++ b/platform/plat_compat.h
@@ -5,6 +5,74 @@
 #ifndef GEX_PLAT_COMPAT_H
 #define GEX_PLAT_COMPAT_H
 
+// -------- Buffers and stack sizes ---------
+
+// FreeRTOS thread stacks (in 4-byte words)
+#define TSK_STACK_MAIN      160
+#define TSK_STACK_MSG       200
+#define TSK_STACK_JOBRUNNER 128
+
+// Size of the snprintf buffer for debug messages
+// (this is on stack to avoid races)
+#define DBG_BUF_LEN 80
+
+// Bulk read/write
+#define BULK_LST_TIMEOUT_MS 200 // timeout for the bulk transaction to expire
+#define BULKREAD_MAX_CHUNK  512 // this is a static buffer
+
+// Error message buffer size (on stack)
+#define ERR_MSG_STR_LEN 32
+
+// Static buffer for saving to flash
+#define FLASH_SAVE_BUF_LEN 256
+
+// Number of job runner slots
+#define HP_SCHED_CAPACITY 5
+
+// Number of message queue slots (64 bytes each)
+#define RX_QUE_CAPACITY 10
+
+
+// ------ TinyFrame config ------
+
+// Maximum received payload size (static buffer)
+// Larger payloads will be rejected.
+#define TF_MAX_PAYLOAD_RX 640
+
+// Size of the sending buffer. Larger payloads will be split to pieces and sent
+// in multiple calls to the write function. This can be lowered to reduce RAM usage.
+#define TF_SENDBUF_LEN 64
+
+// --- Listener counts - determine sizes of the static slot tables ---
+
+// Frame ID listeners (wait for response / multi-part message)
+#define TF_MAX_ID_LST   4
+// Frame Type listeners (wait for frame with a specific first payload byte)
+#define TF_MAX_TYPE_LST 6
+// Generic listeners (fallback if no other listener catches it)
+#define TF_MAX_GEN_LST  1
+
+// Timeout for receiving & parsing a frame
+// ticks = number of calls to TF_Tick()
+#define TF_PARSER_TIMEOUT_TICKS 250
+
+
+// --- Mass Storage / USB config ---
+
+#define USBD_MAX_STR_DESC_SIZ  128
+#define MSC_MEDIA_PACKET       512
+
+
+// INI buffer sizes
+#define INI_KEY_MAX 20
+#define INI_VALUE_MAX 30
+// ini writer
+#define IWBUFFER_LEN 128
+
+
+
+// -------- Platform specific includes and defines ---------
+
 #if defined(GEX_PLAT_F103_BLUEPILL)
 
     // platform name for the version string
diff --git a/tasks/sched_queue.h b/tasks/sched_queue.h
index f9a80d8..3dab5d9 100644
--- a/tasks/sched_queue.h
+++ b/tasks/sched_queue.h
@@ -35,7 +35,4 @@ struct rx_que_item {
     uint8_t data[64];
 };
 
-#define HP_SCHED_CAPACITY 5
-#define RX_QUE_CAPACITY 10
-
 #endif //GEX_SCHED_QUEUE_H
diff --git a/utils/ini_parser.h b/utils/ini_parser.h
index 7b2d2bc..4265965 100644
--- a/utils/ini_parser.h
+++ b/utils/ini_parser.h
@@ -10,8 +10,8 @@
 #endif
 
 // buffer sizes
-#define INI_KEY_MAX 20
-#define INI_VALUE_MAX 30
+//#define INI_KEY_MAX 20
+//#define INI_VALUE_MAX 30 // moved to plat_compat.h
 
 /**
  * INI parser callback, called for each found key-value pair.
diff --git a/utils/ini_writer.c b/utils/ini_writer.c
index d97d6bb..05261e3 100644
--- a/utils/ini_writer.c
+++ b/utils/ini_writer.c
@@ -13,7 +13,7 @@
 #define MAX(a,b) ((a)>(b)?(a):(b))
 #endif
 
-#define IWBUFFER_LEN 128
+//#define IWBUFFER_LEN 128 // moved to plat_compat.h
 
 // sprintf from varargs, allocating buffer on stack. Uses 'format' argument
 #define IW_VPRINTF() do { \