avm1234567 · Oct 2, 2026
diff --git a/bsp/stm32/stm32f103-blue-pill/Kconfig b/bsp/stm32/stm32f103-blue-pill/Kconfig
@@ -5,13 +5,25 @@ BSP_DIR := .
 RTT_DIR := ../../..
 
 PKGS_DIR := packages
+choice
+    prompt "Select SOC"
+    default SOC_STM32F103C8
+    config SOC_STM32F103C8
+        bool "STM32F103C8"
+        select SOC_SERIES_STM32F1
+        select RT_USING_COMPONENTS_INIT
+        select RT_USING_USER_MAIN
 
-config SOC_STM32F103C8
-    bool
-    select SOC_SERIES_STM32F1
-    select RT_USING_COMPONENTS_INIT
-    select RT_USING_USER_MAIN
-    default y
+
+    config SOC_STM32F103C6
+        bool "STM32F103C6"
+        select SOC_SERIES_STM32F1
+        select RT_USING_COMPONENTS_INIT
+        select RT_USING_USER_MAIN
+        select RT_USING_SMALL_MEM              
+        select RT_USING_SMALL_MEM_AS_HEAP      
+        select RT_KLIBC_USING_LIBC_VSSCANF 
+endchoice
 
 source "$(RTT_DIR)/Kconfig"
 osource "$PKGS_DIR/Kconfig"

diff --git a/bsp/stm32/stm32f103-blue-pill/README.md b/bsp/stm32/stm32f103-blue-pill/README.md
@@ -76,7 +76,7 @@ KEY FEATURES
 
 ## 2 Onboard Resources
 
-- MCU：STM32F103C8T6 @72MHz, 64KB FLASH (can be extended to 128KB) , 20KB RAM
+- MCU：STM32F103C8T6 @72MHz, 64KB FLASH (can be extended to 128KB) , 20KB RAM (STM32F103C6T6 with 32KB FLASH, 10KB RAM is also supported)
 
 - Peripherals
 
@@ -308,6 +308,35 @@ According to ST official datasheet, STM32F103C8 has 64KB of Flash. However, STM3
 
 
 
+### 4.3 How to use STM32F103C6 variant
+
+This BSP also supports Blue Pill boards equipped with the **STM32F103C6** (32KB Flash, 10KB RAM).
+
+To configure for STM32F103C6:
+1. Run `scons --menuconfig`
+2. Under **Select SOC**, select `STM32F103C6` (this automatically selects the Small Memory Algorithm heap and lightweight libc vsscanf).
+3. Due to the 32KB Flash and 10KB RAM limits, optimize the following in `menuconfig`:
+   - **RT-Thread Kernel → Memory Management**:
+     - Set **System Heap Memory Management** to `Small Memory Algorithm` (`RT_USING_SMALL_MEM_AS_HEAP`)
+     - Uncheck `Using memheap Memory Algorithm` (`RT_USING_MEMHEAP`)
+   - **RT-Thread Kernel**:
+     - Uncheck `Enable debugging features` (`RT_USING_DEBUG`)
+   - **RT-Thread Kernel → Inter-Thread communication**:
+     - Uncheck `Enable event flag` (`RT_USING_EVENT`)
+     - Uncheck `Enable mailbox` (`RT_USING_MAILBOX`)
+     - Uncheck `Enable message queue` (`RT_USING_MESSAGEQUEUE`)
+   - **RT-Thread Components → Device Drivers**:
+     - Uncheck `Enable serial DMA mode` (`RT_SERIAL_USING_DMA`)
+   - **RT-Thread Components → MSH: command shell**:
+     - Uncheck `Keeping description in symbol table` (`FINSH_USING_DESCRIPTION`)
+     - Uncheck `command option completion enable` (`FINSH_USING_OPTION_COMPLETION`)
+     - Set `The shell thread stack size` to `2048` (`FINSH_THREAD_STACK_SIZE`)
+4. Save and exit menuconfig.
+5. Clean and build the firmware:
+   ```bash
+   scons -c && scons
+   ```
+
 ## 5 Read more
 
 - [[STM32 Blue Pill Board Schematic]](https://stm32duinoforum.com/forum/images/c/c1/wiki_subdomain/Vcc-gnd.com-STM32F103C8-schematic.pdf)

diff --git a/bsp/stm32/stm32f103-blue-pill/README_zh.md b/bsp/stm32/stm32f103-blue-pill/README_zh.md
@@ -26,7 +26,7 @@ STM32F103C8T6最小系统，采用SWD调试接口，可以用3个接口就能完
 
 该开发板常用 **板载资源** 如下：
 
-- MCU：STM32F103C8T6，主频 72MHz，64KB FLASH(实际可烧录128KB) ，20KB RAM
+- MCU：STM32F103C8T6，主频 72MHz，64KB FLASH(实际可烧录128KB) ，20KB RAM（同时支持 STM32F103C6T6，32KB FLASH，10KB RAM）
 - 外部 RAM：无
 - 外部 FLASH：无
 - 常用外设
@@ -113,6 +113,35 @@ msh >
 
 
 
+#### 使用 STM32F103C6 芯片变体
+
+本 BSP 同时支持搭载 **STM32F103C6**（32KB Flash，10KB RAM）的开发板。
+
+配置 STM32F103C6 步骤：
+1. 打开终端，执行 `scons --menuconfig`；
+2. 在 **Select SOC** 中选择 `STM32F103C6`（会自动配置小内存算法堆及轻量化 libc vsscanf）；
+3. 受限于 32KB Flash 和 10KB RAM，需做如下裁剪优化配置：
+   - **RT-Thread Kernel → Memory Management**：
+     - 将 **System Heap Memory Management** 设置为 `Small Memory Algorithm` (`RT_USING_SMALL_MEM_AS_HEAP`)
+     - 取消勾选 `Using memheap Memory Algorithm` (`RT_USING_MEMHEAP`)
+   - **RT-Thread Kernel**：
+     - 取消勾选 `Enable debugging features` (`RT_USING_DEBUG`)
+   - **RT-Thread Kernel → Inter-Thread communication**：
+     - 取消勾选 `Enable event flag` (`RT_USING_EVENT`)
+     - 取消勾选 `Enable mailbox` (`RT_USING_MAILBOX`)
+     - 取消勾选 `Enable message queue` (`RT_USING_MESSAGEQUEUE`)
+   - **RT-Thread Components → Device Drivers**：
+     - 取消勾选 `Enable serial DMA mode` (`RT_SERIAL_USING_DMA`)
+   - **RT-Thread Components → MSH: command shell**：
+     - 取消勾选 `Keeping description in symbol table` (`FINSH_USING_DESCRIPTION`)
+     - 取消勾选 `command option completion enable` (`FINSH_USING_OPTION_COMPLETION`)
+     - 将 `The shell thread stack size` 修改为 `2048` (`FINSH_THREAD_STACK_SIZE`)
+4. 保存并退出 menuconfig；
+5. 执行编译：
+   ```bash
+   scons -c && scons
+   ```
+
 ## 注意事项
 
 - 只能用USB转TTL连接PC机 ;

diff --git a/bsp/stm32/stm32f103-blue-pill/board/Kconfig b/bsp/stm32/stm32f103-blue-pill/board/Kconfig
@@ -10,6 +10,7 @@ menu "Onboard Peripheral Drivers"
 
     config BSP_USING_ARDUINO
         bool "Compatible with Arduino Ecosystem (RTduino)"
+        depends on !SOC_STM32F103C6
         select PKG_USING_RTDUINO
         select BSP_USING_STLINK_TO_USART
         select BSP_USING_UART2
@@ -138,6 +139,7 @@ menu "On-chip Peripheral Drivers"
 
             menuconfig BSP_USING_UART3
                 bool "Enable UART3"
+                depends on !SOC_STM32F103C6
                 default n
                 if BSP_USING_UART3
                     config BSP_UART3_RX_USING_DMA
@@ -251,8 +253,24 @@ menu "On-chip Peripheral Drivers"
         default n
         select RT_USING_SPI
         if BSP_USING_SPI
+            config BSP_USING_SPI1
+                bool "Enable SPI1 BUS"
+                default n
+
+            config BSP_SPI1_TX_USING_DMA
+                bool "Enable SPI1 TX DMA"
+                depends on BSP_USING_SPI1
+                default n
+
+            config BSP_SPI1_RX_USING_DMA
+                bool "Enable SPI1 RX DMA"
+                depends on BSP_USING_SPI1
+                select BSP_SPI1_TX_USING_DMA
+                default n
+
             config BSP_USING_SPI2
                 bool "Enable SPI2 BUS"
+                depends on !SOC_STM32F103C6
                 default n
 
             config BSP_SPI2_TX_USING_DMA

diff --git a/bsp/stm32/stm32f103-blue-pill/board/board.h b/bsp/stm32/stm32f103-blue-pill/board/board.h
@@ -17,13 +17,23 @@
 extern "C" {
 #endif
 
+#if defined(SOC_STM32F103C8)
 #define STM32_FLASH_START_ADRESS     ((uint32_t)0x08000000)
 #define STM32_FLASH_SIZE             (128 * 1024)
 #define STM32_FLASH_END_ADDRESS      ((uint32_t)(STM32_FLASH_START_ADRESS + STM32_FLASH_SIZE))
 
 /* Internal SRAM memory size[Kbytes] <8-64>, Default: 64*/
 #define STM32_SRAM_SIZE      20
 #define STM32_SRAM_END       (0x20000000 + STM32_SRAM_SIZE * 1024)
+#else
+#define STM32_FLASH_START_ADRESS     ((uint32_t)0x08000000)
+#define STM32_FLASH_SIZE             (32 * 1024)
+#define STM32_FLASH_END_ADDRESS      ((uint32_t)(STM32_FLASH_START_ADRESS + STM32_FLASH_SIZE))
+
+/* Internal SRAM memory size[Kbytes] <8-64>, Default: 64*/
+#define STM32_SRAM_SIZE      10
+#define STM32_SRAM_END       (0x20000000 + STM32_SRAM_SIZE * 1024)
+#endif
 
 #if defined(__ARMCC_VERSION)
 extern int Image$$RW_IRAM1$$ZI$$Limit;

diff --git a/bsp/stm32/stm32f103-blue-pill/board/linker_scripts/link.lds b/bsp/stm32/stm32f103-blue-pill/board/linker_scripts/link.lds
@@ -3,10 +3,13 @@
  */
 
 /* Program Entry, set to mark it as "used" and avoid gc */
+_ROM_SIZE = DEFINED(_ROM_SIZE) ? _ROM_SIZE : 128k;
+_RAM_SIZE = DEFINED(_RAM_SIZE) ? _RAM_SIZE : 20k;
+
 MEMORY
 {
-    ROM (rx) : ORIGIN = 0x08000000, LENGTH = 128k /* 128KB flash */
-    RAM (rw) : ORIGIN = 0x20000000, LENGTH =  20k /* 20K sram */
+    ROM (rx) : ORIGIN = 0x08000000, LENGTH = _ROM_SIZE
+    RAM (rw) : ORIGIN = 0x20000000, LENGTH = _RAM_SIZE
 }
 ENTRY(Reset_Handler)
 _system_stack_size = 0x400;

diff --git a/bsp/stm32/stm32f103-blue-pill/rtconfig.py b/bsp/stm32/stm32f103-blue-pill/rtconfig.py
@@ -46,16 +46,24 @@
     DEVICE = ' -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE + ' -Dgcc'
     AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb '
-    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rt-thread.map,-cref,-u,Reset_Handler -T board/linker_scripts/link.lds'
+    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rt-thread.map,-cref,-u,Reset_Handler -T board/linker_scripts/link.lds '
 
     CPATH = ''
     LPATH = ''
 
+    opt_level = ' -O2'
+    if os.path.exists('rtconfig.h'):
+        with open('rtconfig.h', 'r') as f:
+            content = f.read()
+            if 'SOC_STM32F103C6' in content:
+                opt_level = ' -Os'
+                LFLAGS += ' -Wl,--defsym=_ROM_SIZE=32k,--defsym=_RAM_SIZE=10k --specs=nano.specs'
+
     if BUILD == 'debug':
-        CFLAGS += ' -O2 -gdwarf-2 -g'
+        CFLAGS += opt_level + ' -gdwarf-2 -g'
         AFLAGS += ' -gdwarf-2'
     else:
-        CFLAGS += ' -O2'
+        CFLAGS += opt_level
 
     CXXFLAGS = CFLAGS