ret=i2c_master_write_read_device(I2C_MASTER_NUM, MPU6500_SENSOR_ADDR, ®_addr, 1, data, len, I2C_MASTER_TIMEOUT_MS / portTICK_RATE_MS); return ret; } /*** *函 数名: MPU6500_register_write_byte *功能说明: IIC写单个 *形 参: reg_addr:要读取的寄存器地址、data:读取到的数据存储...
ret = i2c\_master\_write\_to\_device(I2C_MASTER_NUM, MPU6500_SENSOR_ADDR, write_buf, sizeof(write_buf), I2C_MASTER_TIMEOUT_MS / portTICK_RATE_MS); return ret; } /\*\* \* @brief i2c master initialization \*/ static esp\_err\_t i2c\_master\_init(void) { int i2c_master_por...
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); if(size > 1) { i2c_master_read(cmd, data_rd, size - 1, ACK_VAL); } i2c_master_read_byte(cmd, data_rd + size - 1,...
i2c_master_write_byte(cmd, (ESP_SLAVE_ADDR << 1) | I2C_MASTER_READ, ACK_EN);二、实现步骤 1. 配置 I2C 总线：确保 I2C 总线的配置正确，包括引脚定义、时钟速率等。#define CONFIG_I2C_MASTER_SDA 21 // SDA引脚#define CONFIG_I2C_MASTER_SCL 22 // SCL引脚#define CONFIG_I2C_MASTER_FREQ_HZ ...
}i2c_cmd_handle_tcmd = i2c_cmd_link_create(); i2c_master_start(cmd); i2c_master_write_byte(cmd, (ESP_SLAVE_ADDR <<1) | READ_BIT, ACK_CHECK_EN);if(size >1) { i2c_master_read(cmd, data_rd, size -1, ACK_VAL); } i2c_master_read_byte(cmd, data_rd + size -1, NACK_VAL...
However, I miss a way to check the length of the out buffer on the slave side, to know whether the master read the bytes. If anyone needs a working two devices I2C ESP32 to ESP32 example, please benefit from my experiments Master: https://github.com/juri117/esp32-i2c-slave Slave:...
5. 使用I2C扫描工具：使用I2C扫描工具（如i2cdetect）扫描I2C总线上的设备，以确保您的设备被正确识别。
Wire.read() 举个例子 #include < Wire.h >voidsetup() { Wire.begin(); //joini2c bus (address optionalformaster)Serial.begin(9600); //startserialforoutput }voidloop() { Wire.requestFrom(2,6); // request6bytesfromslave device #2while(Wire.available()) // slave may send less than req...
i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_READ, true);i2c_master_read_byte(...
esp-hal/esp-hal-common/src/i2c.rs Lines 1498 to 1515 in 6005f92 fn master_write_read( &mut self, addr: u8, bytes: &[u8], buffer: &mut [u8], ) -> Result<(), Error> { // it would be possible to combine the write and read // in one transaction but filling th...