1.I2C 初始化结构体 1.I2C_ClockSpeed 注:I2C的标准和快速模式已经在这里配置完成,根据输入的时钟值来确定,小于等于100k为标准,否则为快速 2.I2C_Mode 3.I2C_DutyCycle 4.I2C_OwnAddress1 5.I2C_Ack 6.I2C_AcknowledgedAddress
在ESP32中,已经带了硬件的I2C,因此只需要调用相关的API接口,就可以实现I2C通讯。 I2C API接口函数如下: I2C 配置函数:i2c_param_config(); I2C 功能安装使能函数:i2c_driver_install(); 创建I2C 连接函数:i2c_cmd_link_create(); 写启动信号到缓存函数:i2c_master_start(); 写一个字节的命令放到到缓存函数:...
i2c clock speed reduction when failing to communicate to a slaveby dami98 » Thu Jun 01, 2023 12:24 pm Hi all, i am facing a problem when my ESP32-S2 fails to communicate to an i2c slave, the problem is better described in the following. At start the i2c port is set to work...
I would like to use the fast device at the fast speed but if I initialize the I2C device with `i2c_param_config` at 1Mbit then, when I want to communicate with the slow device I need to change the clock speed to 400Kbit. At the moment I am tearing the I2C driver down and re...
首先,调用库函数,初始化I2C总线(类似于stm32那样) 这个初始化结构体看起来也挺简单 初始化模式 :Master IO口引脚 :ESP32具有两个I2C,分别映射到的引脚为18 19 25 26。我们这里选择I2C0,也就是I2C_NUM_0,对应18 19号引脚。 总线上拉使能 :enable ...
< Internal GPIO pull mode for I2C scl signal*/union{struct{uint32_tclk_speed;/*!< I2C clock frequency for master mode, (no higher than 1MHz for now) */}master;struct{uint8_taddr_10bit_en;/*!< I2C 10bit address mode enable for slave mode */uint16_tslave_addr;/*!< I2C address...
slave.maximum_speed = I2C_SLAVE_MAX_SPEED // 预期的最大时钟速度 .clk_flags = 0, // 可选项,可以使用 I2C_SCLK_SRC_FLAG_* 标志来选择 I2C 源时钟 }; 2. 源时钟配置 时钟源的配置过程如下: 确定所需的时钟源:根据应用需求,选择满足频率和能力要求的时钟源。 配置时钟分配器:根据所选的时钟源,...
< I2C master clock frequency */#defineI2C_MASTER_TX_BUF_DISABLE 0/*!< I2C master doesn't need buffer */#defineI2C_MASTER_RX_BUF_DISABLE 0/*!< I2C master doesn't need buffer */#defineWRITE_BIT 0/*!< I2C master write */#defineREAD_BIT 1/*!< I2C master read */#defineACK_CHECK...
一文彻底了解SSD1306驱动0.96寸OLED,在这里只聊esp32的i2c如何使用。 1、初始化 (1)配置i2c:指定i2c的引脚、模式、速率等; (2)安装i2c驱动:设置发送、接收缓冲,指定中断等; 这个代码基本是固定的,当做主机的时候都可以使用以下代码来初始化 代码语言:javascript ...
.master.clk_speed = I2C_MASTER_FREQ_HZ,// .clk_flags = 0, /*!< Optional, you can use I2C_SCLK_SRC_FLAG_* flags to choose i2c source clock here. */};esp_err_terr = i2c_param_config(i2c_master_port, &conf);if(err != ESP_OK) {returnerr; ...