🛠️ 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_begi...
Code: Select all i2c_master_cmd_begin()函数还是能够返回ESP_OK,我看函数描述这时不应该返回ESP_FAIL吗? 例如下面函数将SHT30_SENSOR_ADDR改成0x45还是能返回ESP_OK Code: Select all i2c_cmd_handle_t cmd = i2c_cmd_link_create(); i2c_master_start(cmd); i2c_master_write_byte(cmd, (SHT30_SENS...
(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...
i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, I2C_MASTER_TIMEOUT_MS); i2c_cmd_link_delete(cmd);/* 删除句柄,释放空间 */ } //从BMP180读一个字节数据 uint8_tBMP_ReadOneByte(uint8_tReadAddr) { uint8_tdata =0; i2c_cmd_handle_tcmd = i2c_cmd_link_create();/* 创建一个句柄,分配空间 *...
如标题描述,可以通过i2c读到数据,但是i2c_master_cmd_begin()函数会返回ESP_ERR_TIMEOUT问题,其中等待时间不管改成多大都没有用。 Code: Select all i2c_cmd_handle_t cmd = i2c_cmd_link_create(); i2c_master_start(cmd); i2c_master_write_byte(cmd, (slave_device_address<<1)|I2C_MASTER_WRITE, ...
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 ...
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 ...
这两个函数i2c_master_write_byte()和i2c_master_write()具有一个额外的参数指定所述主是否应当确保它已经接收到ACK位。 通过调用触发I2C控制器执行命令链接i2c_master_cmd_begin()。一旦触发执行,就不能修改命令链接。 传输命令后,通过调用释放命令链接使用的资源i2c_cmd_link_delete()。
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_begin(I2c_NUM, cmd,1000/ portTICK_RATE_MS); i2c_cmd_link_delete(cmd); /* 读取数据 */ cmd = i2c_cmd_link_create(); ...
i2c_cmd_link_delete(cmd); if (ret != ESP_OK) { printf("i2c_master_cmd_begin failed: %s\n", esp_err_to_name(ret)); } } void display_number(int num) { // 假设num为0-9之间的数字 if (num < 0 || num > 9) return;