spi_w25q_sample.c

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-08-15     misonyo      first implementation.
 */
/*
 * 程序清单：这是一个 SPI 设备使用例程
 * 例程导出了 spi_w25q_sample 命令到控制终端
 * 命令调用格式：spi_w25q_sample spi10
 * 命令解释：命令第二个参数是要使用的SPI设备名称，为空则使用默认的SPI设备
 * 程序功能：通过SPI设备读取 w25q 的 ID 数据
*/

#include <rtthread.h>
#include <rtdevice.h>

#define W25Q_SPI_DEVICE_NAME     "qspi10"

static void spi_w25q_sample(int argc, char *argv[])
{
    struct rt_spi_device *spi_dev_w25q;
    char name[RT_NAME_MAX];
    rt_uint8_t w25x_read_id = 0x90;
    rt_uint8_t id[5] = {0};

    if (argc == 2)
    {
        rt_strncpy(name, argv[1], RT_NAME_MAX);
    }
    else
    {
        rt_strncpy(name, W25Q_SPI_DEVICE_NAME, RT_NAME_MAX);
    }

    /* 查找 spi 设备获取设备句柄 */
    spi_dev_w25q = (struct rt_spi_device *)rt_device_find(name);
    if (!spi_dev_w25q)
    {
        rt_kprintf("spi sample run failed! can't find %s device!\n", name);
    }
    else
    {
        /* 方式1：使用 rt_spi_send_then_recv()发送命令读取ID */
        rt_spi_send_then_recv(spi_dev_w25q, &w25x_read_id, 1, id, 5);
        rt_kprintf("use rt_spi_send_then_recv() read w25q ID is:%x%x\n", id[3], id[4]);

        /* 方式2：使用 rt_spi_transfer_message()发送命令读取ID */
        struct rt_spi_message msg1, msg2;

        msg1.send_buf   = &w25x_read_id;
        msg1.recv_buf   = RT_NULL;
        msg1.length     = 1;
        msg1.cs_take    = 1;
        msg1.cs_release = 0;
        msg1.next       = &msg2;

        msg2.send_buf   = RT_NULL;
        msg2.recv_buf   = id;
        msg2.length     = 5;
        msg2.cs_take    = 0;
        msg2.cs_release = 1;
        msg2.next       = RT_NULL;

        rt_spi_transfer_message(spi_dev_w25q, &msg1);
        rt_kprintf("use rt_spi_transfer_message() read w25q ID is:%x%x\n", id[3], id[4]);

    }
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(spi_w25q_sample, spi w25q sample);