Generic application multi-sensor

[SERIDJ]

hi,

i am working on application multi-sensor using esp-idf-lib so i connect all my sensor with mux TCA9548A and i want to now if i need to create instance i2c_dev_t dev for each sensor or i can use one for all same sensor ?

[UncleRus]

Hi! You need separate descriptors for each i2c device.

[SERIDJ]

@UncleRus oky so i work with detected device so i can create instance with malloc bcs number of device is detected with i2ccannser

now i create max :

//
static float pressure, temperature, humidity;
static bmp280_t dev_bme280 [8] = {0};
static bmp280_params_t params_bme280 [8] = {0};
//
uint16_t lux;
i2c_dev_t dev_bh1750[8]= {0};
/***************************************************/
i2c_dev_t dev_pcf8574[8];
uint16_t read_port_pcf8574;

/****************************************************/

[UncleRus]

Yes you can create device descriptors dynamically, e.g.

i2c_dev_t *bh1750; // pointer to device descriptor

...

bh1750 = malloc(sizeof(i2c_dev_t)); // allocate memory for descriptor
memset(bh1750, 0, sizeof(i2c_dev_t))); // fill it with zeroes

... // init descriptor, init device, use it

free(bh1750); // free allocated memory

[SERIDJ]

Ah yes yes but for sensor i don't think I free memory bcs I use all time read_bh1750 and I don't initialize device for each read

So it's don't give problem if I don't use free(p) ?