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_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStructure.I2C_ClockSpeed = I2C_Speed; I2C_Init(I2C1, &I2C_...
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...
< 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;/*!< I2C master config */struct{uint8_taddr_10bit_en;/*!< I2C 10bit address mode enable for slave mode */uint16_ts...
Setting the I2C speed on the I2C for the ESP32 results in seriously different SCL clock rates than the freq parameter. Setting freq=100000 is close. Setting freq=200000 is 328 KHz Setting freq=400000 is 750 KHz. freq=400000 waveform captured at: http://land-boards.com/blwiki/index.php...
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 ...
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_t err = i2c_param_config(i2c_master_port, &conf); if (err != ESP_OK) { return err; } return i2c_driver_...
.scl_io_num = I2C_MASTER_SCL_IO, // 配置 SCL 的 GPIO .scl_pullup_en = GPIO_PULLUP_ENABLE, .master.clk_speed = I2C_MASTER_FREQ_HZ, // 为项目选择频率 .clk_flags = 0, // 可选项，可以使用 I2C_SCLK_SRC_FLAG_* 标志来选择 I2C 源时钟};配置从机示例 int i2c_slav...
ESP32s3 I2c0 SCL一直高电平,没有时钟输出,SDA也是一直高电平 日志显示初始化成功 I (4197) driver-codec: i2s driver init success I (9197) driver-codec: I2C_MASTER_NUM=0,mode=1,speed=100000 I (9197) driver-codec: I2C initialized successfully ...
< 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...