nrf52840dk accelerometer

[katokatsu6412]

I recently started working with the NRF52840DK,I need to read data from MC3461 accelerometer via I2C and transmit the results over BLE.

nrF52840-DK

SDK v15.0.0

SoftDevice S140 6.0.0

MC3416 - mCube http://www.google.co.jp/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiJspuPouTdAhUS9LwKHawZBekQFjAAegQICRAB&url=http%3A%2F%2Fwww.mcubemems.com%2Fproduct%2Fmc3416-3-axis-accelerometer%2F&usg=AOvVaw0K3ImbAud7cjhSvePxUsKH

I am trying to acquire data from registers of X axis (0x0D, 0x0E), Y axis (0x0F, 0x10), and Z axis (0x11, 0x12) with slave address set to 0x4C, but always fixed value is returned I am in trouble. Is there any advice?

[awneil]

katokatsu6412 said:

with slave address set to 0x4C

Are you sure that is the correct Slave Address, and that you are presenting it in the correct way - ie, left- or right-justified ?

https://www.avrfreaks.net/comment/1872781#comment-1872781

[katokatsu6412]

When 0x4C is set as the second argument of nrf_drv_twi_rx (), it is confirmed that it is converted to 0x99 as a slave address. Also, if 0x4C is set as the second argument of nrf_drv_twi_tx (), it is confirmed to convert it to 0x98 as a slave address.

[haakonsh]

Do you have a scope of the TWI communication? 

Is VPP connected to VDD or GND? 

[katokatsu6412]

VPP is connected to GND.

[haakonsh]

OK. 

I still need a scope of the TWI communication.