nrf9160 I2C

RE: nrf9160 I2C

gscultho — Tue, 18 Aug 2020 12:57:12 GMT

The problem is that the slave device is not responding to the device address you are putting onto the I2C bus. It looks like you may be thinking that you need to add the read/write bit to an address yourself, which is not true. The driver will do this for you. Just pass the slave's I2C address with no modification to i2c_reg_read_byte(), Make sure you have the correct address from the datasheet.

RE: nrf9160 I2C

liuyanfeng — Tue, 18 Aug 2020 07:18:54 GMT

i use nrf9160 's I2C with max20353,communication.now , first read the max20353 's ID ,below,tips.

[00:04:07.193,359] [1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0[0m

i tried every means,but , it is so , still.

//============================
/*
#define MAX20303_SLAVE_ADDR            (0x50 >> 1)
#define MAX20303_SLAVE_WR_ADDR       ((MAX20303_SLAVE_ADDR << 1))
#define MAX20303_SLAVE_RD_ADDR       ((MAX20303_SLAVE_ADDR << 1) | 1)
*/
static int32_t myi2c_read()
{
uint32_t rslt = 0;
static uint8_t read_data = 0;

i2c_reg_read_byte(max20353_I2C,LSM6DSO_I2C_ADD,0x00,&read_data); //   0X51
printf("feng read_data0:%X \r\n",read_data);

return rslt;
}

what is the problem ?!

RE: nrf9160 I2C

DevinCallahan — Mon, 17 Aug 2020 20:01:56 GMT

Error 195952641 maps to this error:

NRFX_ERROR_DRV_TWI_ERR_ANACK    = (NRFX_ERROR_DRIVERS_BASE_NUM + 1), ///< TWI error: Address not acknowledged.

The I2C device isn't acking the address.

Hope that helps!