initial WIP

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

firmware/periph/inc/ch32x035_pwr.h

@@ -0,0 +1,55 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32x035_pwr.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/06/14
+ * Description        : This file contains all the functions prototypes for the PWR
+ *                      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_PWR_H
+#define __CH32X035_PWR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32x035.h"
+
+/* PVD_detection_level  */
+#define PWR_PVDLevel_0            ((uint32_t)0x00000000)
+#define PWR_PVDLevel_1            ((uint32_t)0x00000020)
+#define PWR_PVDLevel_2            ((uint32_t)0x00000040)
+#define PWR_PVDLevel_3            ((uint32_t)0x00000060)
+
+#define PWR_PVDLevel_2V1          PWR_PVDLevel_0
+#define PWR_PVDLevel_2V3          PWR_PVDLevel_1
+#define PWR_PVDLevel_3V0          PWR_PVDLevel_2
+#define PWR_PVDLevel_4V0          PWR_PVDLevel_3
+
+/* STOP_mode_entry */
+#define PWR_STOPEntry_WFI         ((uint8_t)0x01)
+#define PWR_STOPEntry_WFE         ((uint8_t)0x02)
+
+/* PWR_Flag */
+#define PWR_FLAG_PVDO             ((uint32_t)0x00000004)
+#define PWR_FLAG_FLASH            ((uint32_t)0x00000020)
+
+/* PWR_VDD_Supply_Voltage */
+typedef enum {PWR_VDD_5V = 0, PWR_VDD_3V3 = !PWR_VDD_5V} PWR_VDD;
+
+void       PWR_DeInit(void);
+void       PWR_PVDLevelConfig(uint32_t PWR_PVDLevel);
+void       PWR_EnterSTOPMode(uint8_t PWR_STOPEntry);
+void       PWR_EnterSTANDBYMode(void);
+FlagStatus PWR_GetFlagStatus(uint32_t PWR_FLAG);
+PWR_VDD    PWR_VDD_SupplyVoltage(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif