Add RAM tester example

examples_v30x/check_memory_split/Makefile

@@ -0,0 +1,12 @@
+all : flash
+
+TARGET:=check_memory_split
+TARGET_MCU:=CH32V307
+TARGET_MCU_PACKAGE:=CH32V307VCT6
+TARGET_MCU_MEMORY_SPLIT:=3
+
+include ../../ch32v003fun/ch32v003fun.mk
+
+flash : cv_flash
+clean : cv_clean
+

examples_v30x/check_memory_split/check_memory_split.c

@@ -0,0 +1,59 @@
+// Example testing memory option bytes on ch32v307
+/* 
+   WARNING Portions of this code are under the following copyright.
+*/
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v00x_flash.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2022/08/08
+ * Description        : This file provides all the FLASH firmware functions.
+ *********************************************************************************
+ * 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.
+ *******************************************************************************/
+
+#include "ch32v003fun.h"
+#include <stdio.h>
+
+uint32_t count;
+
+#ifdef TARGET_MCU_MEMORY_SPLIT
+#define BUILD_MEMORY_SPLIT TARGET_MCU_MEMORY_SPLIT
+#else
+#define BUILD_MEMORY_SPLIT -1
+#endif
+
+int main()
+{
+	SystemInit();
+
+	Delay_Ms( 100 );
+
+	printf("Chip ID: %08x\n", INFO->CHIPID );
+	printf("Device ID: %04x\n", INFO->DEVID );
+	printf("Revision ID: %04x\n", INFO->REVID );
+
+	printf("Option bytes in flash are: %04x\n", OB->USER );
+
+	printf("Current RAM split %d\n", (uint8_t)((FLASH->OBR >> 8) & 0x3));
+	printf("Flash RAM split %d\n", (uint8_t)((OB->USER >> 6) & 0x3));
+	printf("Build RAM split %d\n", BUILD_MEMORY_SPLIT);
+
+	// Now check the RAM capacity by sweeping a read and write back operation
+	// in 4k steps until we trigger a fault
+	printf("Testing RAM capacity:\n");
+
+	// volatile to prevent the no-op from being optimized out
+	volatile uint8_t *poke_addr = (void *) SRAM_BASE;
+
+	for (int i = 0; i <= 32; i++) {
+		uint32_t offset = 0x1000 * i;
+		printf("%3dk test: Poking SRAM+0x%05lx... ", i, offset);
+		poke_addr[offset] = poke_addr[offset];
+		printf("success!\n");
+	}
+
+	while(1);
+}

examples_v30x/check_memory_split/funconfig.h

@@ -0,0 +1,6 @@
+#ifndef _FUNCONFIG_H
+#define _FUNCONFIG_H
+
+
+#endif
+