I2C does not work

Slacky

Hello.


i2c does not work. If there is no slave device in the circuit, then there are normal signals on SDA and SCL. But if you connect any slave device, then there are the same signals on the buses, as if they are shorted. Slave devices are 100% working, tested on another microcontroller.

#define I2C_PIN_GROUP       I2C_GPIO_GROUP_C2C3

#define I2C_CLOCK           200000//200K









    drv_i2c_gpio_set(I2C_PIN_GROUP);

    drv_i2c_master_init(I2C_CLOCK);











    /* BME280_I2CADDR - 0x76, reg - 0xD0 */

    drv_i2c_read_series(BME280_I2CADDR << 1, reg, 1, readBuffer, 1);

Without slave device.


With slave device

Slacky

I found the reason. The circuit board was faulty.

Slacky

Ok.

How to get error code from `drv_i2c_write_series()` and `drv_i2c_read_series()`?

TL_YB

Do you mean the error code refers to the reason for writing or reading failure? This doesn't seem to be obtainable.

Slacky

TL_YB 发表于 2025-4-11 15:32
Do you mean the error code refers to the reason for writing or reading failure? This doesn't seem to ...

This is how it can be done. Always returns 0 on success.

int8_t bh1750_i2c_write(const uint8_t *data, uint32_t len, bh1750_dev_t *dev) {



    drv_i2c_write_series(dev->addr, 0, 0, (uint8_t*)data, len);



    return (reg_i2c_status & FLD_I2C_NAK);

}

TL_YB

Hi, I have confirmed from the designer that 8258 does not support NACK check mode.

Slacky

TL_YB 发表于 2025-4-30 16:28
Hi, I have confirmed from the designer that 8258 does not support NACK check mode.

Everything works fine with TLSR8258. If there is no device, this code returns 4. If successful, it returns 0.