diff --git a/bsp/hc32f4a0/board/board.h b/bsp/hc32f4a0/board/board.h
index 927f7d78f29555b5068910f342030e08fe33171e..a35747f13ccce02047364fe6d717b2c282da857a 100644
--- a/bsp/hc32f4a0/board/board.h
+++ b/bsp/hc32f4a0/board/board.h
@@ -6,8 +6,8 @@
  * Change Logs:
  * Date           Author       Notes
  * 2020-10-30     CDT          first version
+ * 2021-01-18     CDT          MOdify SRAM_SIZE
  */
- 
 
 #ifndef __BOARD_H__
 #define __BOARD_H__
@@ -18,7 +18,7 @@
 
 /* board configuration */
 #define SRAM_BASE 0x1FFE0000
-#define SRAM_SIZE 0x20000
+#define SRAM_SIZE 0x80000
 #define SRAM_END (SRAM_BASE + SRAM_SIZE)
 
 /* High speed sram. */
diff --git a/bsp/hc32f4a0/drivers/drv_soft_i2c.c b/bsp/hc32f4a0/drivers/drv_soft_i2c.c
index 38258ba7eebb7b31f1796c02674feb68ca10c4ff..4ee69b8de278cde491cb9b3b0429f006438a6cf0 100644
--- a/bsp/hc32f4a0/drivers/drv_soft_i2c.c
+++ b/bsp/hc32f4a0/drivers/drv_soft_i2c.c
@@ -6,9 +6,9 @@
  * Change Logs:
  * Date           Author       Notes
  * 2020-10-30     CDT          first version
+ * 2021-01-18     CDT          modify i2c gpio init
  */
 
-
 /*******************************************************************************
  * Include files
  ******************************************************************************/
@@ -65,10 +65,8 @@ static const struct hc32_soft_i2c_config soft_i2c_config[] =
 #endif
 };
 
-
 static struct hc32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
 
-
 /*******************************************************************************
  * Function implementation - global ('extern') and local ('static')
  ******************************************************************************/
@@ -81,8 +79,8 @@ static void hc32_i2c_gpio_init(struct hc32_i2c *i2c)
 {
     struct hc32_soft_i2c_config* cfg = (struct hc32_soft_i2c_config*)i2c->ops.data;
 
-    rt_pin_mode(cfg->scl_pin, PIN_MODE_OUTPUT);
-    rt_pin_mode(cfg->sda_pin, PIN_MODE_OUTPUT);
+    rt_pin_mode(cfg->scl_pin, PIN_MODE_OUTPUT_OD);
+    rt_pin_mode(cfg->sda_pin, PIN_MODE_OUTPUT_OD);
 
     rt_pin_write(cfg->scl_pin, PIN_HIGH);
     rt_pin_write(cfg->sda_pin, PIN_HIGH);
@@ -98,8 +96,6 @@ static void hc32_set_sda(void *data, rt_int32_t state)
 {
     struct hc32_soft_i2c_config* cfg = (struct hc32_soft_i2c_config*)data;
 
-    rt_pin_mode(cfg->sda_pin, PIN_MODE_OUTPUT);
-
     if (state)
         rt_pin_write(cfg->sda_pin, PIN_HIGH);
     else
@@ -116,8 +112,6 @@ static void hc32_set_scl(void *data, rt_int32_t state)
 {
     struct hc32_soft_i2c_config* cfg = (struct hc32_soft_i2c_config*)data;
 
-    rt_pin_mode(cfg->scl_pin, PIN_MODE_OUTPUT);
-
     if (state)
         rt_pin_write(cfg->scl_pin, PIN_HIGH);
     else
@@ -133,8 +127,6 @@ static rt_int32_t hc32_get_sda(void *data)
 {
     struct hc32_soft_i2c_config* cfg = (struct hc32_soft_i2c_config*)data;
 
-    rt_pin_mode(cfg->sda_pin, PIN_MODE_INPUT);
-
     return rt_pin_read(cfg->sda_pin);
 }
 
@@ -147,8 +139,6 @@ static rt_int32_t hc32_get_scl(void *data)
 {
     struct hc32_soft_i2c_config* cfg = (struct hc32_soft_i2c_config*)data;
 
-    rt_pin_mode(cfg->scl_pin, PIN_MODE_INPUT);
-
     return rt_pin_read(cfg->scl_pin);
 }
 
@@ -210,7 +200,6 @@ int hc32_hw_i2c_init(void)
 }
 INIT_BOARD_EXPORT(hc32_hw_i2c_init);
 
-
 #endif /* RT_USING_I2C */
 
 /*******************************************************************************