spi_w25q_sample.c

/*
 * Copyright (c) 2006-2018, 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);