RE: NRF51822qfaa,s110 v8.0,TWI question,please help me.

MartinBL — Mon, 23 May 2016 14:52:54 GMT

The slave_add is 0X24,is OK: This depends. My guess is that it should stay at 0x48. Please have a look at my answer in this thread.
If you look at the declaration of nrf_drv_twi_rx() in nrf_drv_twi.h and the error codes defined in nrf_error.h you will see that error code 3 signify // NRF_ERROR_INTERNAL If an error was detected by hardware.. This error might be caused by many things. It might for example very well be that you are using the wrong address so your slave doesn't acknowledge your transmissions.
You can try this example. It is a very basic example that will show you how to use the drivers with an event handler and what address to use.

Regarding your code snippet: It looks like you are trying to do a TWI read operation immediately after you have enabled the TWI. I don't know what kind of TWI slave you are using, but it is common that you first have to do a TWI write operation to tell your slave what address to read from. Here are some more advanced TWI examples showing how to interface an accelerometer. In the driver file, mpu.c, you can see how one can read registers in the function called mpu_read_registers().