initial WIP

lots of code copied over, things filled in to hopefully get the LED matrix lighting up. untested.

firmware/periph/inc/ch32x035_wwdg.h

@@ -0,0 +1,41 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32x035_wwdg.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2023/04/06
+ * Description        : This file contains all the functions prototypes for the WWDG
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32X035_WWDG_H
+#define __CH32X035_WWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32x035.h"
+
+/* WWDG_Prescaler */
+#define WWDG_Prescaler_1    ((uint32_t)0x00000000)
+#define WWDG_Prescaler_2    ((uint32_t)0x00000080)
+#define WWDG_Prescaler_4    ((uint32_t)0x00000100)
+#define WWDG_Prescaler_8    ((uint32_t)0x00000180)
+
+void       WWDG_DeInit(void);
+void       WWDG_SetPrescaler(uint32_t WWDG_Prescaler);
+void       WWDG_SetWindowValue(uint8_t WindowValue);
+void       WWDG_EnableIT(void);
+void       WWDG_SetCounter(uint8_t Counter);
+void       WWDG_Enable(uint8_t Counter);
+FlagStatus WWDG_GetFlagStatus(void);
+void       WWDG_ClearFlag(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif