/// makes one attempt to write a change to rx mode
/// return 0 on success, -1 on failure after 1 ms timeout
int ZigBee_SetModeRx() {
uint8_t zigbee_state = ZigBee_ReadState();
// wait until current state permits a transition
while(zigbee_state == STATUS_BUSY_RX || zigbee_state == STATUS_BUSY_TX || zigbee_state == STATUS_STATE_TRANSITION) {
DelayMicroseconds(100); // should not be required
zigbee_state = ZigBee_ReadState();
}
// if current state is already STATUS_RX_ON, return success
if(zigbee_state == STATUS_RX_ON) {
return(0); // success
}
// request transition
ZigBee_WriteReg(REG_TRX_STATE, CMD_RX_ON);
// poll state until transition verified
// datasheet reports nominal <170 us transition time
// timeout and fail after 1 ms
for(int i = 0; i < 100; i++) { // TODO: revisit timeout threshold
zigbee_state = ZigBee_ReadState();
if (zigbee_state == STATUS_RX_ON)
return(0); // success
}
// zigbee failed to reach state STATUS_RX_ON
return(-1); // failure
}
int ZigBee_SetModeRx()
{
uint8_t zigbee_state = ZigBee_ReadState();
while(zigbee_state == STATUS_BUSY_RX || zigbee_state == STATUS_BUSY_TX || zigbee_state == STATUS_STATE_TRANSITION)
{
zigbee_state = ZigBee_ReadState();
}
ZigBee_WriteReg(REG_TRX_STATE, CMD_RX_ON);
uint8_t state = 0;
for(int i = 0; i < 100; i++)
{
state = ZigBee_ReadState();
if (state == STATUS_RX_ON)
return(0);
}
return(-1);
}
int ZigBee_ForceTrxOff()
{
uint8_t zigbee_state = ZigBee_ReadState();
while(zigbee_state == STATUS_BUSY_RX || zigbee_state == STATUS_BUSY_TX || zigbee_state == STATUS_STATE_TRANSITION)
{
zigbee_state = ZigBee_ReadState();
}
//write FORCE_TRX_OFF to TRX_STATE
ZigBee_WriteReg(REG_TRX_STATE, CMD_FORCE_TRX_OFF);
uint8_t state = 0;
for(int i = 0; i < 300; i++)
{
state = ZigBee_ReadState();
if (state == STATUS_TRX_OFF)
return(0);
}
return(-1);
}
int ZigBee_PllOn()
{
uint8_t zigbee_state = ZigBee_ReadState();
while(zigbee_state == STATUS_BUSY_RX || zigbee_state == STATUS_BUSY_TX || zigbee_state == STATUS_STATE_TRANSITION)
{
zigbee_state = ZigBee_ReadState();
}
#if defined(DEBUG)
printf("zigbee setting PLL ON\r\n");
#endif
ZigBee_WriteReg(REG_TRX_STATE, CMD_PLL_ON);
uint8_t state = 0;
for(int i = 0; i < 100; i++)
{
state = ZigBee_ReadState();
if (state == STATUS_PLL_ON)
return(0);
}
return(-1);
}