98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
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/*
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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 I2C 设备使用例程
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* 例程导出了 i2c_io_sample 命令到控制终端
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* 命令调用格式：i2c_io_sample
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* 命令解释：使用默认的I2C总线设备i2c0
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* 程序功能：通过 I2C 设备接收数据并打印，然后将接收的字符加1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 I2C_BUS_NAME "i2c0" /* I2C总线设备名称 */
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#define SLAVE_ADDR 0x2D /* 从机地址 */
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#define STR_LEN 16 /* 接收发送的数据长度 */
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static void i2c_io_sample(int argc, char *argv[])
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{
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struct rt_i2c_bus_device *i2c_bus = RT_NULL; /* I2C总线设备句柄 */
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struct rt_i2c_msg temp_msg; /* I2C消息 */
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rt_uint8_t buffer[STR_LEN] = { 0U };
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rt_uint32_t i,num_msg;
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rt_size_t s_stat;
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i2c_bus = (struct rt_i2c_bus_device *)rt_device_find(I2C_BUS_NAME); /* 通过名字获取I2C总线设备的句柄 */
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if( i2c_bus == RT_NULL)
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{
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rt_kprintf("can't find i2c device :%s !\n",I2C_BUS_NAME);
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return;
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}
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/*初始化消息*/
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temp_msg.addr = SLAVE_ADDR; /* 从机地址 */
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temp_msg.len = STR_LEN; /* 传输的数据长度 */
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temp_msg.buf = buffer; /* 读写缓存器 */
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num_msg = 1; /* 传输一条消息 */
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temp_msg.flags = RT_I2C_RD; /* I2C读 */
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s_stat = rt_i2c_transfer(i2c_bus,&temp_msg,num_msg); /* 传输消息 */
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rt_thread_mdelay(400);
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if( s_stat == num_msg )
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{
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rt_kprintf("receive successful. \n receive messege : %s \n:",buffer);
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for( i = 0 ; i < STR_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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}
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else
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{
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rt_kprintf("device s% recieve fail \n buffer : s%\n",I2C_BUS_NAME,buffer);
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return;
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}
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for( i = 0 ; i < STR_LEN ; i++)
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buffer[i]++;
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temp_msg.flags = RT_I2C_WR; /* I2C写 */
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s_stat = rt_i2c_transfer(i2c_bus,&temp_msg,num_msg); /* 传输一条 */
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rt_thread_mdelay(400);
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if( s_stat == num_msg )
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{
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rt_kprintf(" send successful \n messege : %s \n:",buffer);
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for( i = 0 ; i < STR_LEN ; i++)
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rt_kprintf(" %x",(unsigned int)buffer[i]);
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rt_kprintf("\n");
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}
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else
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{
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rt_kprintf("device s% send fail \n",I2C_BUS_NAME);
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return;
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}
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return;
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}
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/* 导出到 msh 命令列表中 */
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MSH_CMD_EXPORT(i2c_io_sample, i2c io sample);
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