diff --git a/sdk/examples/spi_master2/.gitignore b/sdk/examples/spi_master2/.gitignore
deleted file mode 100644
index 80a4578..0000000
--- a/sdk/examples/spi_master2/.gitignore
+++ /dev/null
@@ -1,8 +0,0 @@
-# Object files
-*.o
-*.ko
-*.obj
-*.bin
-*.dump
-*.mem
-spi_master
diff --git a/sdk/examples/spi_master2/Makefile b/sdk/examples/spi_master2/Makefile
deleted file mode 100644
index e5f03e7..0000000
--- a/sdk/examples/spi_master2/Makefile
+++ /dev/null
@@ -1,21 +0,0 @@
-RISCV_ARCH := rv32im
-RISCV_ABI := ilp32
-RISCV_MCMODEL := medlow
-
-
-TARGET = spi_master
-
-
-#CFLAGS += -DSIMULATION
-#CFLAGS += -O2
-#ASM_SRCS +=
-#LDFLAGS +=
-#INCLUDES += -I.
-
-C_SRCS := \
-	main.c \
-	flash_w25q.c
-
-
-BSP_DIR = ../../bsp
-include ../../bsp/bsp.mk
diff --git a/sdk/examples/spi_master2/README.md b/sdk/examples/spi_master2/README.md
deleted file mode 100644
index 9f12e40..0000000
--- a/sdk/examples/spi_master2/README.md
+++ /dev/null
@@ -1 +0,0 @@
-spi_master例程。
\ No newline at end of file
diff --git a/sdk/examples/spi_master2/flash_w25q.c b/sdk/examples/spi_master2/flash_w25q.c
deleted file mode 100644
index 89a0358..0000000
--- a/sdk/examples/spi_master2/flash_w25q.c
+++ /dev/null
@@ -1,116 +0,0 @@
-#include <stdint.h>
-
-#include "../../bsp/include/spi.h"
-#include "../../bsp/include/rvic.h"
-#include "../../bsp/include/utils.h"
-#include "flash_w25q.h"
-
-
-void flash_w25q_init(uint16_t clk_div)
-{
-    spi0_set_clk_div(clk_div);
-    spi0_set_role_mode(SPI_ROLE_MODE_MASTER);
-    spi0_set_spi_mode(SPI_MODE_STANDARD);
-    spi0_set_cp_mode(SPI_CPOL_0_CPHA_0);
-    spi0_set_msb_first();
-    spi0_master_set_ss_delay(1);
-    spi0_set_ss_level(1);
-    spi0_set_ss_ctrl_by_sw(1);
-    spi0_set_enable(1);
-}
-
-uint8_t flash_w25q_read_reg(uint8_t cmd)
-{
-    uint8_t data;
-
-    spi0_set_ss_level(0);
-    spi0_master_write_bytes(&cmd, 1);
-    spi0_master_read_bytes(&data, 1);
-    spi0_set_ss_level(1);
-
-    return data;
-}
-
-uint8_t flash_w25q_write_reg(uint8_t cmd, uint8_t data)
-{
-    spi0_set_ss_level(0);
-    spi0_master_write_bytes(&cmd, 1);
-    spi0_master_write_bytes(&data, 1);
-    spi0_set_ss_level(1);
-}
-
-uint8_t flash_w25q_send_cmd(uint8_t cmd)
-{
-    spi0_set_ss_level(0);
-    spi0_master_write_bytes(&cmd, 1);
-    spi0_set_ss_level(1);
-}
-
-void flash_w25q_volatile_status_reg_write_enable()
-{
-    flash_w25q_send_cmd(CMD_WRITE_ENABLE_FOR_VOL_STATUS_REG);
-}
-
-// 读flash ID
-w25q_id_t flash_w25q_read_id()
-{
-    w25q_id_t id;
-    uint8_t cmd;
-    uint8_t data[2];
-    uint8_t addr[3];
-
-    cmd = CMD_READ_ID;
-    addr[0] = 0x0;
-    addr[1] = 0x0;
-    addr[2] = 0x0;
-
-    spi0_set_ss_level(0);
-    spi0_master_write_bytes(&cmd, 1);
-    spi0_master_write_bytes(addr, 3);
-    spi0_master_read_bytes(data, 2);
-    spi0_set_ss_level(1);
-
-    id.manf_id = data[0];
-    id.device_id = data[1];
-
-    return id;
-}
-
-void flash_w25q_enable_qspi(uint8_t en)
-{
-    uint8_t data;
-
-    flash_w25q_volatile_status_reg_write_enable();
-    data = flash_w25q_read_reg(CMD_READ_STATUS_REG2);
-    if (en)
-        data |= 1 << 1;
-    else
-        data &= ~(1 << 1);
-    flash_w25q_write_reg(CMD_WRITE_STATUS_REG2, data);
-}
-
-w25q_id_t flash_w25q_read_id_quad()
-{
-    w25q_id_t id;
-    uint8_t cmd;
-    uint8_t data[2];
-    uint8_t addr[3];
-
-    cmd = CMD_READ_ID_QUAD;
-    addr[0] = 0x0;
-    addr[1] = 0x0;
-    addr[2] = 0x0;
-
-    spi0_set_ss_level(0);
-    spi0_master_write_bytes(&cmd, 1);
-    spi0_set_spi_mode(SPI_MODE_QUAD);
-    spi0_master_write_bytes(addr, 3);
-    spi0_master_read_bytes(data, 2);
-    spi0_master_read_bytes(data, 2);
-    spi0_set_ss_level(1);
-
-    id.manf_id = data[0];
-    id.device_id = data[1];
-
-    return id;
-}
diff --git a/sdk/examples/spi_master2/flash_w25q.h b/sdk/examples/spi_master2/flash_w25q.h
deleted file mode 100644
index 219811e..0000000
--- a/sdk/examples/spi_master2/flash_w25q.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#ifndef _FLASH_W25Q_H_
-#define _FLASH_W25Q_H_
-
-
-
-#define CMD_READ_ID                             (0x90)
-#define CMD_READ_ID_QUAD                        (0x94)
-#define CMD_READ_STATUS_REG2                    (0x35)
-#define CMD_WRITE_STATUS_REG2                   (0x31)
-#define CMD_WRITE_ENABLE_FOR_VOL_STATUS_REG     (0x50)
-
-
-typedef struct {
-    uint8_t manf_id;
-    uint8_t device_id;
-} w25q_id_t;
-
-void flash_w25q_init(uint16_t clk_div);
-w25q_id_t flash_w25q_read_id();
-void flash_w25q_enable_qspi(uint8_t en);
-w25q_id_t flash_w25q_read_id_quad();
-
-
-#endif
diff --git a/sdk/examples/spi_master2/main.c b/sdk/examples/spi_master2/main.c
deleted file mode 100644
index 9087f3c..0000000
--- a/sdk/examples/spi_master2/main.c
+++ /dev/null
@@ -1,44 +0,0 @@
-#include <stdint.h>
-
-#include "../../bsp/include/uart.h"
-#include "../../bsp/include/spi.h"
-#include "../../bsp/include/xprintf.h"
-#include "../../bsp/include/utils.h"
-#include "../../bsp/include/rvic.h"
-#include "../../bsp/include/pinmux.h"
-#include "../../bsp/include/sim_ctrl.h"
-#include "flash_w25q.h"
-
-
-
-int main()
-{
-    w25q_id_t id;
-
-    pinmux_set_io0_func(IO0_UART0_TX);
-    pinmux_set_io3_func(IO3_UART0_RX);
-
-    pinmux_set_io6_func(IO6_SPI_CLK);
-    pinmux_set_io8_func(IO8_SPI_SS);
-    pinmux_set_io1_func(IO1_SPI_DQ0);
-    pinmux_set_io2_func(IO2_SPI_DQ1);
-    pinmux_set_io4_func(IO4_SPI_DQ2);
-    pinmux_set_io5_func(IO5_SPI_DQ3);
-
-    uart0_init(uart0_putc);
-    flash_w25q_init(5);
-
-    xprintf("read id:\n");
-    id = flash_w25q_read_id();
-    xprintf("manf id = 0x%2x\n", id.manf_id);
-    xprintf("device id = 0x%2x\n", id.device_id);
-
-    flash_w25q_enable_qspi(1);
-    xprintf("quad read id:\n");
-    id = flash_w25q_read_id_quad();
-    xprintf("manf id = 0x%2x\n", id.manf_id);
-    xprintf("device id = 0x%2x\n", id.device_id);
-    flash_w25q_enable_qspi(0);
-
-    while (1);
-}