SPI

通过SPI设备读取 w25q 的 ID 数据

通过SPI设备读取 w25q 的 ID 数据

源码

/* * 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);