🛠️ ESP32的I2C编程API: i2c_param_config:配置I2C引脚。 i2c_driver_install:安装I2C驱动。 i2c_cmd_link_create:创建一个I2C命令链表。 i2c_master_start:添加起始信号。 i2c_master_write_byte:写入一个字节。 i2c_master_read_byte:读取一个字节。 i2c_master_stop:发送停止信号。 i2c_master_cmd_begin...
i2c_master_start(cmd);// 启动I2C i2c_master_write_byte(cmd, ( TCS34725_address <<1) | I2C_MASTER_WRITE, ACK_CHECK_EN);// 发送地址+写+检查ack i2c_master_write_byte(cmd, reg_addr, ACK_CHECK_EN);// 发送ID寄存器地址 i2c_master_stop(cmd);// 关闭发送I2C err = i2c_master_cmd_begi...
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...
(2)在ESP32中,如果我们想要使用硬件I2C传输数据,需要先向一个缓冲区写入自己要发送的指令,然后再调用i2c_master_cmd_begin()将这个缓冲区的数据输出。 (3)需要注意的一点是,调用i2c_master_cmd_begin()将这个缓冲区的数据输出之后,i2c_cmd_link_create()创建的命令缓冲区的数据不会被清除,依旧存在,所以需要调用...
然后,初始化给定 I2C 端口的配置,请使用端口号和i2c_config_t作为函数调用参数来调用i2c_param_config()函数。 配置示例(主机): int i2c_master_port = 0; i2c_config_t conf = { .mode = I2C_MODE_MASTER, .sda_io_num = I2C_MASTER_SDA_IO, // select GPIO specific to your project ...
UART but I2C needs a direct GND connection between the two ESP32! So my new approach works like common I2C register communication. The master sends a request for specific data, then waits for a fixed period of time, while the slave puts some data (with fixed length) into the out buffer...
voidI2C_WriteByte(uint8_t addr,uint8_t data){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_byte(cmd,addr,ACK_CHECK_EN);i2c_master_write_byte(cmd,data,ACK_CHECK_EN);i2c...
I2C写单个字节的命令(写命令) #define oled_12864_addr0x78#define oled_write_cmd0x00#define oled_write_data0x40voidi2c_WriteCmd(uint8_t pcmd)//写单个字节命令{i2c_cmd_handle_t cmd=i2c_cmd_link_create();i2c_master_start(cmd);i2c_master_write_byte(cmd,oled_12864_addr|I2C_MASTER_WRITE,1...
因此,为了将数据写入从机,主机发送的命令链接应包含地址 (ESP_SLAVE_ADDR << 1) | I2C_MASTER_WRITE,如下所示: i2c_master_write_byte(cmd, (ESP_SLAVE_ADDR << 1) | I2C_MASTER_WRITE, ACK_EN); 同理,指示从从机读取数据的命令链接如下所示: i2c_master_write_byte(cmd, (ESP_SLAVE_ADDR << 1...
conf.master.clk_speed = I2C_MASTER_FREQ_HZ; i2c_param_config(I2C_MASTER_NUM, &conf); i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0); } void tm1650_write_byte(uint8_t reg, uint8_t data) { ...