153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*
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* Copyright (C) 2018 Shanghai Eastsoft Microelectronics Co., Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-12-15 liuhy first implementation.
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*/
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/*
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* 程序清单：这是一个 SPI 设备使用例程
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* 例程导出了 spi_io_sample 命令到控制终端
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* 命令调用格式：spi_io_sample
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* 程序功能：通过SPI设备先读取数据，然后每个字符加1后输出。
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#define SPI_DEVICE_NAME "spi00"
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#define BUF_LEN 16
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static void spi_io_sample(int argc, char *argv[])
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{
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struct rt_spi_device * spi_dev; /* spi设备的句柄 */
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struct rt_spi_configuration spi_config;
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rt_uint8_t i,buffer[BUF_LEN] = { 0U };
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rt_err_t s_stat;
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rt_err_t result;
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/* 查找 spi设备 获取spi设备句柄 */
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spi_dev = (struct rt_spi_device *)rt_device_find(SPI_DEVICE_NAME);
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if (spi_dev == RT_NULL)
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{
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rt_kprintf("spi sample run failed! can't find %s device!\n", SPI_DEVICE_NAME);
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return;
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}
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/* 清空配置结构体 */
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rt_memset(&spi_config,0,sizeof(struct rt_spi_configuration));
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spi_config.mode &= ~RT_SPI_SLAVE; /* 主机模式 */
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spi_config.mode &= ~RT_SPI_3WIRE; /* 4线，双向传输 */
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spi_config.mode |= RT_SPI_CPHA; /* 第二边沿采样 */
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spi_config.mode |= RT_SPI_CPOL; /* 空闲高电平 */
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spi_config.mode |= RT_SPI_NO_CS; /* 禁用软件从机选择管理 */
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spi_config.mode |= RT_SPI_MSB; /* 高位在前 */
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spi_config.data_width = 8; /* 数据长度：8 */
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spi_config.max_hz = 2000000; /* 最快时钟频率 */
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/* 配置SPI设备 */
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s_stat = rt_spi_configure(spi_dev,&spi_config);
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if(s_stat != RT_EOK)
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{
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rt_kprintf(" spi config fail !\n ");
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return;
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}
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/* 获取总线 ，防止总线被多个线程同时使用 */
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result = rt_spi_take_bus(spi_dev);
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if (result != RT_EOK)
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{
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rt_kprintf(" %s take spi bus failed! \n", SPI_DEVICE_NAME);
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return;
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}
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/* 选中片选 */
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result = rt_spi_take(spi_dev);
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if (result != RT_EOK)
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{
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rt_kprintf(" %s take spi cs failed! \n", SPI_DEVICE_NAME);
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return;
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}
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/*接收一次数据*/
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result = rt_spi_recv(spi_dev,buffer,BUF_LEN);
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if(result != BUF_LEN)
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{
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rt_kprintf("receive fail. \n buffer is : %s \n:",buffer);
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for( i = 0 ; i < BUF_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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return;
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}
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rt_kprintf("receive successful. \n buffer is : %s \n:",buffer);
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for( i = 0 ; i < BUF_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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/* 将接收到的数据加1 */
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for( i = 0 ; i < BUF_LEN ; i++)
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buffer[i]++;
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/*发送数据*/
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result = rt_spi_send(spi_dev,buffer,BUF_LEN);
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if(result != BUF_LEN)
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{
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rt_kprintf("send fail. \n buffer is : %s \n:",buffer);
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for( i = 0 ; i < BUF_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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return;
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}
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rt_kprintf("send successful. \n buffer is : %s \n:",buffer);
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for( i = 0 ; i < BUF_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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/* 释放片选 */
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result = rt_spi_release(spi_dev);
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if (result != RT_EOK)
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{
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rt_kprintf(" %s release spi cs failed! \n", SPI_DEVICE_NAME);
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return;
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}
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/* 释放总线 */
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result = rt_spi_release_bus(spi_dev);
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if (result != RT_EOK)
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{
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rt_kprintf(" %s release spi bus failed! \n", SPI_DEVICE_NAME);
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return;
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}
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}
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/* 导出到 msh 命令列表中 */
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MSH_CMD_EXPORT(spi_io_sample, spi sample);
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