TWI Switch between easyDMA and normal read

[Constantin]

Hi,

I am reading a BMX055 via I2C which consists of three sensors with three addresses. I got the easyDMA running to read 10 times the gyro using the PPI and the data ready interrupt. Now after 10 readings I want to read once the accelerometer and the magnetometer. But if I try to read with

nrf_drv_twi_tx(&m_twi_instance, address, &reg, 1, false); nrf_drv_twi_rx(&m_twi_instance, address, p_data, length);

I get the NRF_ERROR_BUSY which means that the TWIM is still in use. So here is my question how can I switch from easyDMA reading to normal reading.

Thanks and kind regards,

C.

[Jørgen Holmefjord]

The use of the TWIM peripheral directly through the registers should not cause the return of the error code NRF_ERROR_BUSY. Where do you initialize the TWI driver? If you initialize it before you run the TWIM transfers, are you sure the driver is setup to use TWI peripheral and not TWIM peripheral?