I2C with Softdevice nrf_drv_twi_enable hangs

[Mark P. Mendelsohn]

Using SDK 12.1.0

I2C with SoftDevice works on PCA10040 Eval Board with nRF52832 but hangs in the nrf_drv_twi_enable function with TY module EBSGCNZWY which is an nRF51822 version F1. Running without the SoftDevice on the TY module, the I2C works fine.

[Mark P. Mendelsohn]

Here are some more data points on this issue:

running peripheral/twi_scanner using s132/pca10040 returns output of

 0> APP:INFO:TWI scanner.
 0> APP:INFO:TWI device detected at address 0x53.

running peripheral/twi_sensor with the 0x53 address found from running twi_scanner returns output of

 0> APP:INFO:
 0> TWI sensor example
 0> APP:INFO:
 0> handler 1 

indicating the device address is nacked.