added Ch32v30x PVD test.

ch32fun/ch32v30xhw.h

@@ -8601,7 +8601,7 @@ typedef struct
 #define PWR_FLAG_WU               ((uint32_t)0x00000001)
 #define PWR_FLAG_SB               ((uint32_t)0x00000002)
 #define PWR_FLAG_PVDO             ((uint32_t)0x00000004)
-
+#define PVD_MAX_THRESHOLD_LVL     7
 
 
 /* ch32v00x_rcc.h ------------------------------------------------------------*/

ch32fun/ch32x00xhw.h

@@ -1877,6 +1877,7 @@ typedef struct
 
 /*******************  Bit definition for PWR_CSR register  ********************/
 #define PWR_CSR_PVDO                            ((uint16_t)0x0004) /* PVD Output */
+#define PVD_MAX_THRESHOLD_LVL                   3
 
 /******************************************************************************/
 /*                         Reset and Clock Control                            */

examples_v30x/pvd_voltageDetect_test/Makefile

@@ -0,0 +1,12 @@
+all : flash
+
+TARGET:=pvd_voltageDetect_test
+TARGET_MCU:=CH32V303
+TARGET_MCU_PACKAGE:=CH32V303
+
+include ../../ch32fun/ch32fun.mk
+
+flash : cv_flash
+clean : cv_clean
+
+

examples_v30x/pvd_voltageDetect_test/funconfig.h

@@ -0,0 +1,13 @@
+#ifndef _FUNCONFIG_H
+#define _FUNCONFIG_H
+
+#define FUNCONF_SYSTICK_USE_HCLK 1
+#define FUNCONF_USE_HSI 1
+#define FUNCONF_USE_PLL 0
+#define FUNCONF_PLL_MULTIPLIER 2
+
+#define FUNCONF_USE_DEBUGPRINTF 1
+#define FUNCONF_SYSTEM_CORE_CLOCK 8 * 1000 * 1000 
+
+#endif
+

examples_v30x/pvd_voltageDetect_test/pvd_voltageDetect_test.c

@@ -0,0 +1,43 @@
+// Simple example that shows how to use the PVD voltage detector functions
+// the datasheet shows 2 different PVD levels selection options one for VLEVEL 0 and one for VLEVEL 1
+// It's not mentioned anywhere (that I can find) what chip uses what PVD level, if you find it let me know
+// When the input supply voltage drop bellow the threshold the PVD will trigger an alert
+
+// Testing Methods:
+// Method 1: Using a Potentiometer
+// 		Connect a potentiometer across the power supply input and ground
+// 		Adjust the potentiometer to vary the input voltage
+// 		Observe the PVD status output as the voltage crosses the threshold
+
+// Method 2: Using a Voltage Divider
+//		Add a series resistor to the power input to create a voltage drop
+//		Monitor the PVD output to detect when voltage falls below the set threshold
+
+#define VLEVEL 1
+// #define VLEVEL 0
+
+#include "ch32fun.h"
+#include <stdio.h>
+#include "lib_pvd.h"
+
+void PVD_statusPrint() {
+	const char *v1[] = { "2.29", "2.46", "2.55", "2.67", "2.78", "2.93", "3.06", "3.19" };
+	const char *v0[] = { "2.13", "2.25", "2.32", "2.42", "2.51", "2.61", "2.69", "2.79" };
+	const char *threshold_str = (VLEVEL == 0) ? v0[PVD_getThreshold()] : v1[PVD_getThreshold()];
+
+	printf("\nThreshold: %sV", threshold_str);
+	printf("\nStatus: %s\n", PVD_getAlert() ? "BELOW THRESHOLD!" : "Normal");
+}
+
+int main() {
+	SystemInit();
+	Delay_Ms(100);
+
+	printf("\n~ PVD Voltage Detector Test ~\n");
+	PVD_init(7); 			// select threshold 0-7
+
+	while(1) {
+		PVD_statusPrint();
+		Delay_Ms(1000);
+	}
+}

examples_x00x/pvd_voltage_detector/pvd_voltage_detector.c

@@ -19,53 +19,25 @@
 
 #include "ch32fun.h"
 #include <stdio.h>
-#include "register_debug_utilities.h"
+#include "lib_pvd.h"
 
-void configure_PVD(u8 threshold) {
-	// Enable PWR clock
-	RCC->APB1PCENR |= RCC_APB1Periph_PWR;
-
-	// Enable PVD
-	PWR->CTLR |= PWR_CTLR_PVDE;
-
-	if (threshold > 3) threshold = 3;
-	printf("\n");
-	printf("Before write:\n");
-	UTIL_PRINT_REG16(PWR->CTLR, "PWR_CTLR");
-
-	// set the PLS[1:0] bits
-	PWR->CTLR &= ~(0b011 << 5);		// clear bits
-	PWR->CTLR |= (threshold << 5);
-	printf("After setting:\n");
-	UTIL_PRINT_REG16(PWR->CTLR, "PWR_CTLR");
-	printf("\n");
-}
-
-// threshold1 = 2.1V, theshold2 = 2.3V, threshold3 = 3.0V, threshold4 = 4.0V
-void check_PVD_status(void) {	
-	// Get threshold setting: the PLS[1:0] bits
-	uint8_t threshold_setting = (PWR->CTLR >> 5) & 0x03;
-
-	// get the PVD0 status bit: it's set when the voltage drops below the threshold
-	uint8_t pvd_alert = (PWR->CSR >> 2) & 0x01;
-
+void PVD_statusPrint() {
 	const char *thresholds[] = { "2.1V", "2.3V", "3.0V", "4.0V" };
-	printf("\nThreshold: %s ", thresholds[threshold_setting]);
-	printf("Status: %s\n", pvd_alert ? "BELOW THRESHOLD!" : "Normal");
+	const char *threshold_str = thresholds[PVD_getThreshold()];
+
+	printf("\nThreshold: %sV", threshold_str);
+	printf("\nStatus: %s\n", PVD_getAlert() ? "BELOW THRESHOLD!" : "Normal");
 }
 
 int main() {
 	SystemInit();
-	funGpioInitAll(); // Enable GPIOs
+	Delay_Ms(100);
 
 	printf("\n~PVD Voltage Detector Example~\n");
-	// printf("Chip ID: %08lX\r\n", ESIG->UID0);
-	// printf("Chip Capacity: %d KB\r\n", ESIG->CAP);
-	configure_PVD(1);
+	PVD_init(1);
 
 	while(1) {
-		check_PVD_status();
+		PVD_statusPrint();
 		Delay_Ms(1000);
-		// printf("IM HERE\n");
 	}
 }

extralibs/lib_pvd.h

@@ -0,0 +1,26 @@
+// Tested with CH32V002, CH32V006, and CH32V303
+
+#include "ch32fun.h"
+
+void PVD_init(u8 threshold) {
+	if (threshold > PVD_MAX_THRESHOLD_LVL) threshold = PVD_MAX_THRESHOLD_LVL;
+
+	// Enable PWR clock
+	RCC->APB1PCENR |= RCC_APB1Periph_PWR;
+
+	// Enable PVD
+	PWR->CTLR |= PWR_CTLR_PVDE;
+
+	// Clear the existing PLS bits and set new threshold
+	PWR->CTLR = (PWR->CTLR & ~PWR_CTLR_PLS) | (threshold << 5);
+}
+
+// Get threshold setting: the PLS[1:0] bits
+u8 PVD_getThreshold() {
+	return (PWR->CTLR & PWR_CTLR_PLS) >> 5;
+}	
+
+// return PVD flag: 1 if VDD below threshold
+u8 PVD_getAlert() {
+	return PWR->CSR & PWR_CSR_PVDO;
+}