From 9d92def44dc84a0fd125850c81ec99aecee2b899 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Tue, 07 Oct 2025 01:25:58 +0800
Subject: [PATCH] 楼道声光控灯项目程序

---
 Core/Src/board/miscdev.c |   62 +++++++++++++++++++++++++++++++
 1 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/Core/Src/board/miscdev.c b/Core/Src/board/miscdev.c
index b89d071..bcb51f8 100644
--- a/Core/Src/board/miscdev.c
+++ b/Core/Src/board/miscdev.c
@@ -153,3 +153,65 @@
     }
 }
 
+/*
+ *+----------------------+
+ *|      printf API      |
+ *+----------------------+
+ */
+#include "usart.h"  /* 全局变量huart1定义在 usart.c中,并在sart.h头文件中声明 */
+
+/* gcc 编译器中的 printf 函数将会调用 __io_putchar() 函数,实现最终的字符打印
+ * keil编译器中的 printf 函数将会调用 fputc() 函数,实现最终的字符打印
+ * 这里我们定义一个宏 PUTCHAR_PROTOTYPE 来兼容这两个编译器所需要的函数原型;
+ */
+#ifdef __GNUC__
+#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
+#else
+#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
+#endif
+
+/*
+ * STM32CubeIDE使用的是 gcc 编译器,它会内建 __GNUC__ 宏定义,所以下面PUTCHAR_PROTOTYPE将会扩展为:
+ *  int __io_putchar(int ch)
+ */
+PUTCHAR_PROTOTYPE
+{
+    /* 调用STM32 HAL库的串口发送函数,将printf要打印的这个字符通过串口发送出去 */
+    HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
+    return ch;
+}
+
+/*
+ *+----------------------------+
+ *| ADC noisy & lux sensor API |
+ *+----------------------------+
+ */
+
+#include "adc.h"
+int adc_sample_lux_noisy(uint32_t *lux, uint32_t *noisy)
+{
+    uint8_t            i;
+    uint32_t           timeout = 0xffffff;
+
+    for(i=0; i<ADCCHN_MAX; i++)
+    {
+            HAL_ADC_Start(&hadc1);
+
+            HAL_ADC_PollForConversion(&hadc1, timeout);
+
+            if( ADCCHN_NOISY == i )
+            {
+                *noisy = HAL_ADC_GetValue(&hadc1);
+            }
+            else if( ADCCHN_LUX == i )
+            {
+                *lux = HAL_ADC_GetValue(&hadc1);
+            }
+
+            HAL_Delay(10);
+    }
+
+    HAL_ADC_Stop(&hadc1);
+
+    return 0;
+}

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