how to set RF modulation type?

Question

Hi. I'm using nRF51822AC, S130. I made source code for RF test as below.

NRF_RADIO->SHORTS		   = 0;
NRF_RADIO->EVENTS_DISABLED = 0;
NRF_RADIO->TEST 		   = 0;
NRF_RADIO->TASKS_DISABLE   = 1;
while (NRF_RADIO->EVENTS_DISABLED == 0)
{
	// Do nothing.
}
NRF_RADIO->EVENTS_DISABLED = 0;

NRF_RADIO->SHORTS	  = RADIO_SHORTS_READY_START_Msk;
NRF_RADIO->TXPOWER	  = (4 << RADIO_TXPOWER_TXPOWER_Pos);	 
NRF_RADIO->MODE 	  = (RADIO_MODE_MODE_Nrf_2Mbit << RADIO_MODE_MODE_Pos);
NRF_RADIO->FREQUENCY  = 2;
NRF_RADIO->TEST 	  = (RADIO_TEST_CONSTCARRIER_Enabled << RADIO_TEST_CONSTCARRIER_Pos) \
						| (RADIO_TEST_PLLLOCK_Enabled << RADIO_TEST_PLLLOCK_Pos);
NRF_RADIO->TASKS_TXEN = 1;
NRF_POWER->DCDCEN = 1;


while(1)
{
	__WFI();
	;
}

How can i change Modulation type(Modulation as GFSK or not)?

I need your help.

Einar Thorsrud · Accepted Answer

The radio only support GFSK modulation, and only the following four variants: 
 
 1 Mbit/s Nordic proprietary radio mode 
 2 Mbit/s Nordic proprietary radio mode 
 250 kbit/s Nordic proprietary radio mode (deprecated, but working) 
 1 Mbit/s Bluetooth Low Energy 
 
 The difference between the 1 Mbit proprietary and 1 Mbit BLE mode is mainly that the modulation index is different.