[bsp][wch][risc-v] add drv_flash for ch32v307.

Author: Maihuanyi

bsp/wch/risc-v/Libraries/ch32_drivers/SConscript

@@ -51,6 +51,9 @@ if  GetDepend('SOC_RISCV_FAMILY_CH32'):
     if GetDepend('BSP_USING_HWTIMER'):
         src += ['drv_hwtimer.c']
 
+    if GetDepend(['BSP_USING_ON_CHIP_FLASH']):
+        src += ['drv_flash.c']
+
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)
 
 Return('group')

bsp/wch/risc-v/Libraries/ch32_drivers/drv_flash.c

@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-05-20     Chasel       first version
+ *
+ */
+
+#include <rtconfig.h>
+#include <rtdef.h>
+
+#ifdef BSP_USING_ON_CHIP_FLASH
+#include "drv_flash.h"
+#include <board.h>
+
+#if defined(RT_USING_FAL)
+#include "fal.h"
+#endif
+
+//#define DRV_DEBUG
+#define LOG_TAG                "drv.flash"
+#include <drv_log.h>
+
+#define FLASH_PAGE_SIZE        4096
+
+/**
+  * @brief  Gets the page of a given address
+  * @param  Addr: Address of the FLASH Memory
+  * @retval The page of a given address
+  */
+static uint32_t GetPage(uint32_t addr)
+{
+    uint32_t page = 0;
+    page = RT_ALIGN_DOWN(addr, FLASH_PAGE_SIZE);
+    return page;
+}
+
+/**
+ * Read data from flash.
+ * @note This operation's units is word.
+ *
+ * @param addr flash address
+ * @param buf buffer to store read data
+ * @param size read bytes size
+ *
+ * @return result
+ */
+int ch32_flash_read(rt_uint32_t addr, rt_uint8_t *buf, size_t size)
+{
+    size_t i;
+
+    if ((addr + size) > CH32_FLASH_END_ADDRESS)
+    {
+        LOG_E("read outrange flash size! addr is (0x%p)", (void *)(addr + size));
+        return -RT_EINVAL;
+    }
+
+    for (i = 0; i < size; i++, buf++, addr++)
+    {
+        *buf = *(rt_uint8_t *) addr;
+    }
+
+    return size;
+}
+
+/**
+ * Write data to flash.
+ * @note This operation's units is word.
+ * @note This operation must after erase. @see flash_erase.
+ *
+ * @param addr flash address
+ * @param buf the write data buffer
+ * @param size write bytes size
+ *
+ * @return result
+ */
+int ch32_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size)
+{
+    rt_err_t result        = RT_EOK;
+    FLASH_Status status    = 0;
+    rt_uint32_t end_addr   = addr + size;
+
+    if (addr % 4 != 0)
+    {
+        LOG_E("write addr must be 4-byte alignment");
+        return -RT_EINVAL;
+    }
+
+    if ((end_addr) > CH32_FLASH_END_ADDRESS)
+    {
+        LOG_E("write outrange flash size! addr is (0x%p)", (void *)(addr + size));
+        return -RT_EINVAL;
+    }
+
+    FLASH_Unlock();
+    FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_WRPRTERR);
+
+    while (addr < end_addr)
+    {
+        status = FLASH_ProgramWord(addr, *((rt_uint32_t *)buf));
+        if (status == FLASH_COMPLETE)
+        {
+            if (*(rt_uint32_t *)addr != *(rt_uint32_t *)buf)
+            {
+                result = -RT_ERROR;
+                break;
+            }
+            addr += 4;
+            buf  += 4;
+        }
+        else
+        {
+            result = -RT_ERROR;
+            break;
+        }
+    }
+
+    FLASH_Lock();
+
+    if (result != RT_EOK)
+    {
+        return result;
+    }
+
+    return size;
+}
+
+/**
+ * Erase data on flash .
+ * @note This operation is irreversible.
+ * @note This operation's units is different which on many chips.
+ *
+ * @param addr flash address
+ * @param size erase bytes size
+ *
+ * @return result
+ */
+int ch32_flash_erase(rt_uint32_t addr, size_t size)
+{
+    rt_err_t result = RT_EOK;
+    FLASH_Status status = 0;
+    uint32_t num_page = 0;
+    uint32_t i = 0;
+
+    if ((addr + size) > CH32_FLASH_END_ADDRESS)
+    {
+        LOG_E("ERROR: erase outrange flash size! addr is (0x%p)\n", (void *)(addr + size));
+        return -RT_EINVAL;
+    }
+
+    FLASH_Unlock();
+
+    num_page = (size + FLASH_PAGE_SIZE - 1) / FLASH_PAGE_SIZE;
+
+    FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_WRPRTERR);
+
+    for(i = 0; (i < num_page) && (status == FLASH_COMPLETE); i++)
+    {
+        status = FLASH_ErasePage(GetPage(addr + i * FLASH_PAGE_SIZE)); //Erase 4KB
+
+        if(status != FLASH_COMPLETE)
+        {
+            LOG_E("FLASH Erase Fail\r\n");
+            result = -RT_ERROR;
+            goto __exit;
+        }
+    }
+
+__exit:
+    FLASH_Lock();
+
+    if (result != RT_EOK)
+    {
+        return result;
+    }
+
+    return size;
+}
+
+
+#if defined(RT_USING_FAL)
+
+static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size);
+static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size);
+static int fal_flash_erase(long offset, size_t size);
+
+const struct fal_flash_dev ch32_onchip_flash = { "onchip_flash", CH32_FLASH_START_ADRESS, CH32_FLASH_SIZE, FLASH_PAGE_SIZE, {NULL, fal_flash_read, fal_flash_write, fal_flash_erase}, 8, {} ,};
+
+static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size)
+{
+    return ch32_flash_read(ch32_onchip_flash.addr + offset, buf, size);
+}
+
+static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size)
+{
+    return ch32_flash_write(ch32_onchip_flash.addr + offset, buf, size);
+}
+
+static int fal_flash_erase(long offset, size_t size)
+{
+    return ch32_flash_erase(ch32_onchip_flash.addr + offset, size);
+}
+
+#endif
+#endif /* BSP_USING_ON_CHIP_FLASH */

bsp/wch/risc-v/Libraries/ch32_drivers/drv_flash.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-05-20     Chasel       first version
+ */
+
+#ifndef __DRV_FLASH_H__
+#define __DRV_FLASH_H__
+
+#include <rtthread.h>
+#include "rtdevice.h"
+#include <rthw.h>
+#include <drv_common.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int ch32_flash_read(rt_uint32_t addr, rt_uint8_t *buf, size_t size);
+int ch32_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size);
+int ch32_flash_erase(rt_uint32_t addr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __DRV_FLASH_H__ */