giomba/nes-proj
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Unmodulated carrier transmission for cc2420

Browse Source 
Modified the cc2420 driver to enable the radio test
mode to emit unmodulated carriers (tones).
A carrier can be enabled using the normal radio driver
API:
NETSTACK_CONF_RADIO.set_value(
    RADIO_PARAM_POWER_MODE,
    RADIO_POWER_MODE_CARRIER_ON);

Once enabled, the carrier can be disabled like this:
NETSTACK_CONF_RADIO.set_value(
    RADIO_PARAM_POWER_MODE,
    RADIO_POWER_MODE_CARRIER_OFF);
This commit is contained in:
Carlos Pérez Penichet 2018-10-24 15:26:40 +02:00
parent 37e9027807
commit feb1513b46
2 changed files with 43 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
arch/dev/cc2420/cc2420.c
View File

@ -114,6 +114,7 @@ PROCESS(cc2420_process, "CC2420 driver");
#define CORR_THR(n) (((n) & 0x1f) << 6)
#define FIFOP_THR(n) ((n) & 0x7f)
#define RXBPF_LOCUR (1 << 13);
#define TX_MODE (3 << 2)
int cc2420_on(void);
int cc2420_off(void);
@ -135,6 +136,8 @@ static void set_poll_mode(uint8_t enable);
static void set_send_on_cca(uint8_t enable);
static void set_auto_ack(uint8_t enable);
static void set_test_mode(uint8_t enable, uint8_t modulated);
signed char cc2420_last_rssi;
uint8_t cc2420_last_correlation;
@ -156,7 +159,11 @@ get_value(radio_param_t param, radio_value_t *value)
}
switch(param) {
case RADIO_PARAM_POWER_MODE:
if ((getreg(CC2420_MDMCTRL1) & TX_MODE) & 0x08) {
*value = RADIO_POWER_MODE_CARRIER_ON;
} else {
*value = receive_on ? RADIO_POWER_MODE_ON : RADIO_POWER_MODE_OFF;
}
return RADIO_RESULT_OK;
case RADIO_PARAM_CHANNEL:
*value = cc2420_get_channel();
@ -237,6 +244,11 @@ set_value(radio_param_t param, radio_value_t value)
cc2420_off();
return RADIO_RESULT_OK;
}
if(value == RADIO_POWER_MODE_CARRIER_ON ||
value == RADIO_POWER_MODE_CARRIER_OFF) {
set_test_mode((value == RADIO_POWER_MODE_CARRIER_ON), 0);
return RADIO_RESULT_OK;
}
return RADIO_RESULT_INVALID_VALUE;
case RADIO_PARAM_CHANNEL:
if(value < 11 || value > 26) {
@ -1120,3 +1132,30 @@ set_send_on_cca(uint8_t enable)
send_on_cca = enable;
}
/*---------------------------------------------------------------------------*/
/* Enable or disable radio test mode emmiting modulated or unmodulated
* (carrier) signal. See datasheet page 55.
*/
static uint16_t prev_MDMCTRL1, prev_DACTST;
static void
set_test_mode(uint8_t enable, uint8_t modulated)
{
if (enable) {
prev_MDMCTRL1 = getreg(CC2420_MDMCTRL1);
setreg(CC2420_MDMCTRL1, 0x050C);
if (!modulated) {
prev_DACTST = getreg(CC2420_DACTST);
setreg(CC2420_DACTST, 0x1800);
}
/* actually starts the test mode */
strobe(CC2420_STXON);
} else {
if (!modulated) {
setreg(CC2420_DACTST, prev_DACTST);
}
setreg(CC2420_MDMCTRL1, prev_MDMCTRL1);
/* actually stops the carrier */
strobe(CC2420_SRFOFF);
}
}
/*---------------------------------------------------------------------------*/

4
os/dev/radio.h
View File

@ -196,7 +196,9 @@ enum {
/* Radio power modes */
enum {
RADIO_POWER_MODE_OFF,
RADIO_POWER_MODE_ON
RADIO_POWER_MODE_ON,
RADIO_POWER_MODE_CARRIER_ON,
RADIO_POWER_MODE_CARRIER_OFF
};
/**