diff --git a/sdk/bsp/include/i2c.h b/sdk/bsp/include/i2c.h
index 07b9cd3..792dab4 100644
--- a/sdk/bsp/include/i2c.h
+++ b/sdk/bsp/include/i2c.h
@@ -43,8 +43,13 @@ void i2c0_stop();
 #define I2C_CTRL_INT_PENDING_BIT 2
 #define I2C_CTRL_MODE_BIT 3
 #define I2C_CTRL_WRITE_BIT 4
-#define I2C_CTRL_ACK_BIT 5
-#define I2C_CTRL_ERROR_BIT 6
+#define I2C_CTRL_ERROR_BIT 5
+#define I2C_CTRL_SLAVE_WR_BIT 6
+#define I2C_CTRL_SLAVE_RDY_BIT 7
+#define I2C_CTRL_SLAVE_ADDR_MASK 0xff
+#define I2C_CTRL_SLAVE_ADDR_OFFSET 8
+#define I2C_CTRL_SLAVE_ADDR_FIELD \
+  ((bitfield_field32_t) { .mask = I2C_CTRL_SLAVE_ADDR_MASK, .index = I2C_CTRL_SLAVE_ADDR_OFFSET })
 #define I2C_CTRL_CLK_DIV_MASK 0xffff
 #define I2C_CTRL_CLK_DIV_OFFSET 16
 #define I2C_CTRL_CLK_DIV_FIELD \
@@ -66,13 +71,17 @@ void i2c0_stop();
 #define I2C_MASTER_DATA_DATA_FIELD \
   ((bitfield_field32_t) { .mask = I2C_MASTER_DATA_DATA_MASK, .index = I2C_MASTER_DATA_DATA_OFFSET })
 
-// I2C slave received data register
-#define I2C_SLAVE_DATA_REG_OFFSET 0x8
-#define I2C_SLAVE_DATA_REG_RESVAL 0x0
-#define I2C_SLAVE_DATA_SLAVE_DATA_MASK 0xff
-#define I2C_SLAVE_DATA_SLAVE_DATA_OFFSET 0
-#define I2C_SLAVE_DATA_SLAVE_DATA_FIELD \
-  ((bitfield_field32_t) { .mask = I2C_SLAVE_DATA_SLAVE_DATA_MASK, .index = I2C_SLAVE_DATA_SLAVE_DATA_OFFSET })
+// I2C slave read or write address register
+#define I2C_SLAVE_ADDR_REG_OFFSET 0x8
+#define I2C_SLAVE_ADDR_REG_RESVAL 0x0
+
+// I2C slave write data register
+#define I2C_SLAVE_WDATA_REG_OFFSET 0xc
+#define I2C_SLAVE_WDATA_REG_RESVAL 0x0
+
+// I2C slave read data register
+#define I2C_SLAVE_RDATA_REG_OFFSET 0x10
+#define I2C_SLAVE_RDATA_REG_RESVAL 0x0
 
 #ifdef __cplusplus
 }  // extern "C"
diff --git a/sdk/examples/i2c_master/.gitignore b/sdk/examples/i2c_master/.gitignore
new file mode 100644
index 0000000..294f05e
--- /dev/null
+++ b/sdk/examples/i2c_master/.gitignore
@@ -0,0 +1,8 @@
+# Object files
+*.o
+*.ko
+*.obj
+*.bin
+*.dump
+*.mem
+i2c_master
diff --git a/sdk/examples/i2c_master/Makefile b/sdk/examples/i2c_master/Makefile
new file mode 100644
index 0000000..2ac36bb
--- /dev/null
+++ b/sdk/examples/i2c_master/Makefile
@@ -0,0 +1,20 @@
+RISCV_ARCH := rv32im
+RISCV_ABI := ilp32
+RISCV_MCMODEL := medlow
+
+
+TARGET = i2c_master
+
+
+#CFLAGS += -DSIMULATION
+#CFLAGS += -O2
+#ASM_SRCS +=
+#LDFLAGS +=
+#INCLUDES += -I.
+
+C_SRCS := \
+	main.c \
+
+
+BSP_DIR = ../../bsp
+include ../../bsp/bsp.mk
diff --git a/sdk/examples/i2c_master/README.md b/sdk/examples/i2c_master/README.md
new file mode 100644
index 0000000..0f0cc1a
--- /dev/null
+++ b/sdk/examples/i2c_master/README.md
@@ -0,0 +1 @@
+i2c_master例程。
\ No newline at end of file
diff --git a/sdk/examples/i2c_master/main.c b/sdk/examples/i2c_master/main.c
new file mode 100644
index 0000000..6f0725b
--- /dev/null
+++ b/sdk/examples/i2c_master/main.c
@@ -0,0 +1,72 @@
+#include <stdint.h>
+
+#include "../../bsp/include/uart.h"
+#include "../../bsp/include/i2c.h"
+#include "../../bsp/include/xprintf.h"
+#include "../../bsp/include/utils.h"
+#include "../../bsp/include/rvic.h"
+
+
+#define SLAVE_ADDR   (0xA0)
+
+static volatile uint8_t i2c_done;
+
+static void i2c_master_write(uint8_t addr, uint8_t data)
+{
+    i2c_done = 0;
+    i2c0_master_set_write(1);
+    i2c0_master_set_info(SLAVE_ADDR, addr, data);
+    i2c0_start();
+
+    while (!i2c_done);
+}
+
+static uint8_t i2c_master_read(uint8_t addr)
+{
+    i2c_done = 0;
+    i2c0_master_set_write(0);
+    i2c0_master_set_info(SLAVE_ADDR, addr, 0);
+    i2c0_start();
+
+    while (!i2c_done);
+
+    return (i2c0_master_get_data());
+}
+
+int main()
+{
+    uint8_t data, i;
+
+    uart0_init(uart0_putc);
+
+    i2c0_set_clk(0x7D);     // 200KHZ
+    i2c0_set_mode(I2C_MODE_MASTER);
+    i2c0_set_interrupt_enable(1);
+
+    rvic_set_irq_prio_level(RVIC_INT_ID_4, 1);
+    rvic_irq_enable(RVIC_INT_ID_4);
+    global_irq_enable();
+
+    // 写
+    for (i = 0; i < 10; i++) {
+        i2c_master_write(i, i);
+        xprintf("write[%d] = 0x%x\n", i, i);
+        busy_wait(100 * 1000);
+    }
+
+    // 读
+    for (i = 0; i < 10; i++) {
+        data = i2c_master_read(i);
+        xprintf("read[%d] = 0x%x\n", i, data);
+    }
+
+    while (1);
+}
+
+void i2c0_irq_handler()
+{
+    i2c_done = 1;
+
+    i2c0_clear_irq_pending();
+    rvic_clear_irq_pending(RVIC_INT_ID_4);
+}