diff --git a/project/cmake/toolchain-arm-none-eabi.cmake b/project/cmake/toolchain-arm-none-eabi.cmake
index 67e0a9d..a3e7a62 100644
--- a/project/cmake/toolchain-arm-none-eabi.cmake
+++ b/project/cmake/toolchain-arm-none-eabi.cmake
@@ -38,7 +38,9 @@ set(CMAKE_C_FLAGS_DEBUG "-O0 -gdwarf-2 -g")
 set(CMAKE_C_FLAGS_RELEASE "-O3")
 
 set(LINKER_SCRIPT STM32F407ZGTX_FLASH.ld)
-set(CMAKE_EXE_LINKER_FLAGS "${MCU_FLAGS} -Wl,--gc-sections,-Map=${PROJECT_NAME}.map,--cref,-u,Reset_Handler -T${LINKER_SCRIPT}")
+set(CMAKE_EXE_LINKER_FLAGS "${MCU_FLAGS} --specs=nano.specs -specs=nosys.specs -Wl,--gc-sections,-Map=${PROJECT_NAME}.map,--cref,-u,Reset_Handler -T${LINKER_SCRIPT}")
+# LDFLAGS += -lc -lrdimon -u _printf_float
+
 #set(CMAKE_EXE_LINKER_FLAGS "--specs=nano.specs -specs=nosys.specs -nostartfiles -T${LINKER_SCRIPT} -Wl,-Map=${PROJECT_BINARY_DIR}/${PROJECT_NAME}.map,--cref -Wl,--gc-sections")
 
 
diff --git a/src/App/main.c b/src/App/main.c
index 66af4d8..3c8aff6 100644
--- a/src/App/main.c
+++ b/src/App/main.c
@@ -9,7 +9,6 @@
  */
 
 /* Includes ------------------------------------------------------------------*/
-#include <stdio.h>
 
 #include "main.h"
 
@@ -56,13 +55,11 @@ int main(void)
     // alphabeta_t Valphabeta = math_rev_park(foc_handle.Vqd, hall_handle.control_elec_angle);
     // // 计算SVPWM输出
     // // svmpw()
+    
     while (1)
     {
         // 测试PWM输出
-        // __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_1, 42 * 1000000 / 16000);
-
-        // printf("direction is %d", hall_handle.direction);
-
+        printf("direction is %d\n", hall_handle.direction);
         led_ctrl(1);
         HAL_Delay(500);
         led_ctrl(0);
@@ -70,20 +67,37 @@ int main(void)
     }
 }
 
-/// 重定向c库函数printf到串口DEBUG_USART，重定向后可使用printf函数
-int fputc(int ch, FILE *f)
+#ifdef __GNUC__
+// #pragma import(__use_no_semihosting)
+
+// void _sys_exit(int x)
+// {
+//     x = x;
+// }
+
+int _write(int fd, char *ptr, int len)
 {
-    /* 发送一个字节数据到串口DEBUG_USART */
-    HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
-    return (ch);
+    HAL_UART_Transmit(&huart1, (uint8_t *)ptr, len, 0xFFFF);
+    fflush(stdout);
+    return len;
 }
 
-/// 重定向c库函数scanf到串口DEBUG_USART，重写向后可使用scanf、getchar等函数
-int fgetc(FILE *f)
-{
-    int ch;
-    HAL_UART_Receive(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
-    return (ch);
-}
+#endif
+
+// /// 重定向c库函数printf到串口DEBUG_USART，重定向后可使用printf函数
+// int fputc(int ch, FILE *f)
+// {
+//     /* 发送一个字节数据到串口DEBUG_USART */
+//     HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
+//     return (ch);
+// }
+
+// /// 重定向c库函数scanf到串口DEBUG_USART，重写向后可使用scanf、getchar等函数
+// int fgetc(FILE *f)
+// {
+//     int ch;
+//     HAL_UART_Receive(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
+//     return (ch);
+// }
 
 /* END OF FILE ---------------------------------------------------------------*/
diff --git a/src/App/main.h b/src/App/main.h
index c5134b1..b22c2f8 100644
--- a/src/App/main.h
+++ b/src/App/main.h
@@ -17,14 +17,14 @@ extern "C"
 #endif
 
     /* Includes ------------------------------------------------------------------*/
-
+#include <stdio.h>
 #include "board.h"
 
     /* Functions  ----------------------------------------------------------------*/
 
     extern hall_handle_t hall_handle;
     extern foc_handle_t foc_handle;
-
+    extern int _write(int fd, char *ptr, int len);
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/Foc/hall.c b/src/Foc/hall.c
index 88a0080..01227e1 100644
--- a/src/Foc/hall.c
+++ b/src/Foc/hall.c
@@ -113,4 +113,5 @@ void calc_hall_angle(hall_handle_t *handle, uint8_t new_state)
 
         break;
     }
+    handle->state = new_state;
 }
\ No newline at end of file