i2c_cmd_handle_t cmd = i2c_cmd_link_create(); i2c_master_start(cmd); i2c_master_write_byte(cmd, ( ESP_SLAVE_ADDR << 1 ) | WRITE_BIT, ACK_CHECK_EN); i2c_master_write(cmd, data_wr, size, ACK_CHECK_EN); i2c_master_stop(cmd); esp_err_t ret = i2c_master_cmd_begin(i2c_num...
static esp_err_t i2c_read(i2c_port_t i2c_num, uint8_t* data_rd, size_t size) { if (size == 0) { return ESP_OK; } i2c_cmd_handle_t cmd = i2c_cmd_link_create(); i2c_master_start(cmd); i2c_master_write_byte(cmd, ( ESP_SLAVE_ADDR << 1 ) | READ_BIT, ACK_CHECK_EN)...
ESP32 I2C 扫描仪 Arduino 程序 每个I2C 设备都有一个与其关联的地址。ESP32 使用该地址通过 I2C 协议与从机进行通信。 现在复制此代码并将其上传到您的开发板以及已连接的所有 I2C 设备。 此代码将扫描与 ESP32 连接的任何 I2C 设备,并指定串行终端中具有该地址的设备数量。 #include<Wire.h> voidsetup(){...
< 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_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MAS...
esp_err_ti2c_master_init(void){inti2c_master_port=I2C_MASTER_NUM;i2c_config_tconf={.mode=I2C_MODE_MASTER,.sda_io_num=I2C_MASTER_SDA_IO,.sda_pullup_en=GPIO_PULLUP_ENABLE,.scl_io_num=I2C_MASTER_SCL_IO,.scl_pullup_en=GPIO_PULLUP_ENABLE,.master.clk_speed=I2C_MASTER_FREQ_HZ,// ...
i2c_master_start(cmd); i2c_master_write_byte(cmd, SHT2X_SLAVEADDRESS<<1| WRITE_BIT, ACK_CHECK_EN); i2c_master_write_byte(cmd, SHT2X_CMD_WR_REG, ACK_CHECK_EN); i2c_master_stop(cmd); ret = i2c_master_cmd_begin(i2c_num, cmd,500/ portTICK_RATE_MS); ...
Ah, that's interesting, thanks for the swift response and the link. I'd kinda assumed that sincei2c_master_cmd_begin()necessarily has to block until it has finished with the bus, that any glitch-handling stuff would be over by then, but maybe it is cleverer than that and does stuff ...
The i2c_master_init function will be used to initialise the I2C in the master mode. Here we will first configure the I2C parameters, which are as followsmode sets the mode for the I2C. It can be either master/slave. Since we want the ESP32 to be a master, we will set the I2C_...
本次选用的RFID传感器与OLED一样是I2C接口,也同样都是Grove插座。Grove连接线一头接在RFID传感器上,另一头接在EzDIO上方5个I2C插座的其中一个即可。 EzDIO 与RFID传感器接线图 ● 连接按钮 按钮是作为触发人脸辨识使用,只有在对准人脸并按下按钮时,才会发动解锁功能。主要用来避免,当人经过时不小心触发解锁。
I have found some issue with finding i2c device on the bus. The i2c device is connected to the esp32 on address 0x17. But when I do the i2cdetect using the i2c_tools example in the esp-idf folder, I get into issues. The output has some UU UU values as shown below, which I do...