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