安装I2C驱动:通过调用相关函数安装I2C驱动。 数据读写:在主机模式下,使用i2c_master_transmit()和i2c_master_transmit_receive()函数进行数据的发送和接收;在从机模式下,则使用i2c_slave_receive()等函数。 四、I2C通信实例 以下是一个简单的I2C通信实例,展示了两个ESP32设备如何通过I2C总线进行主从收发通信: 主机端...
i2c_device_config_tdev_cfg = { .dev_addr_length = I2C_ADDR_BIT_LEN_7, .device_address =0x68, .scl_speed_hz =10000, };i2c_master_dev_handle_tdev_handle; ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_bus_handle, &dev_cfg, &dev_handle)); status = i2c_master_transmit_receive(dev...
i2c_master_receive(... the i2c_master_transmit_receive seems to do a new start message and sending the address again before the read. uint8_t data[2] = {0x05, 0x00}; // Works set the register address in data[0] and the data to be sent in data[1] i2c_master_transmit(dev_handl...
I tried out the IDF 5.2 branch as to the new I2C driver implementation. Unfortunately, I cant get it to work to read data from devices in master mode. Writing data to devices works like a charm. Using reading functions (i2c_master_receive or i2c_master_transmit_receive) leads to a hang...
01 = Slave transmit mode 10 = Master receive mode 11 = Master transmit mode 第5位,产生起始和停止信号,1:起始(主线繁忙),0:停止(主线空闲)。想看主线是否繁忙只需看第5位的状态就行 第4位,0:关闭数据的接收和发送;1:使能数据的接收和发送 ...
I2C概述 I2C全称是Inter-Integrated Circuit,是飞利浦半导体公司(06年迁移到NXP了)在1982年发明的,是使用非常广泛的一种通信协议,很多传感器、存储芯片、OLED等,都是在使用I2C。标准输出模式下能达到100kbps的传输速率,快速模式下能达到400kbps的传输速率,高速模式下能达到3.4Mbps,超高速下最快能达到5Mbps。 与UART一...
i2c_master_stop(cmd); ret = i2c_master_cmd_begin(E53_SC1_I2C_NUM, cmd, 1000 / portTICK_RATE_MS); i2c_cmd_link_delete(cmd); return ret; } void Init_BH1750(void) { uint8_t data; I2C_Init(); data = BH1750_PWR_ON; BH1750_I2C_Master_Transmit(BH1750_SLAVE_ADDR, NULL, &data...
esp_err_t res = i2c_master_transmit(*dev_handle, ®_addr, 1, -1); if (res != ESP_OK) { printf("I2C write error: %s\n", esp_err_to_name(res)); return res; } // Receive data from the I2C device res = i2c_master_receive(*dev_handle, buf, buflen, -1); res = ESP...
图I2C接口的RTC芯片 图 单片机I2C部分引脚图 软件 启动I2C 启动Wire库并作为主机或者从机加入总线,这个函数调用一次即可,参数为7位从机地址,不带参数就以主机的形式加入总线。 Wire.begin(); Wire.begin(address); 主设备从从设备请求字节 由主设备向从设备请求字节,之后用available()和read()函数读取字节,第三...
27.5.1 I2C master Writes to I2C slave with a 7-bit Address in One Command Sequence 27.5.2 I2C master Writes to I2C slave with a 10-bit Address in One Command Sequence 27.5.3 I2C master Writes to I2C slave with Two 7-bit Addresses in One Command Sequence 27.5.4 I2C master Writes ...