uint8_t mrf_rssi(void)
{
uint8_t rssi;
mrf_write_short(0x3E, 0x80);
// Wait for result to be ready
while(!(mrf_read_short(0x3E) & 0x01));
rssi = mrf_read_long(0x210);
mrf_write_short(0x3E, 0x40);
return rssi;
}
extern "C" void EINT3_IRQHandler(void)
{
uint8_t flags;
//LPC_GPIO1->FIOPIN ^= 1<<31;
LPC_GPIOINT->IO2IntClr |= (1 << 4); // Clear mbed interrupt flag
flags = mrf_read_short(INTSTAT); // Read radio interrupt flags
if(flags & 0x01) {
tx_status_ready = 1;
}
if(flags & 0x08) {
//nrk_led_toggle(GREEN_LED);
rf_parse_rx_packet();
rfSettings.pRxInfo = rf_rx_callback(rfSettings.pRxInfo);
}
}
uint8_t rf_tx_packet(RF_TX_INFO *pRTI)
{
uint16_t frameControlField;
uint8_t packetLength;
uint8_t success, i;
// Note: checksum is automatic in HW
LPC_GPIO1->FIOPIN ^= 1<<31;
packetLength = pRTI->length + RF_PACKET_OVERHEAD_SIZE;
frameControlField = RF_FCF_NOACK;
if(auto_ack_enable || pRTI->ackRequest) frameControlField |= RF_ACK_BM;
if(security_enable) frameControlField |= 0x0000; // TODO: Paul Gurniak, add security
mrf_write_long(TXNFIFO, RF_PACKET_OVERHEAD_SIZE); // No checksum, overhead is all header
mrf_write_long(TXNFIFO+1, packetLength);
// Write header bytes
mrf_write_long(TXNFIFO+2, frameControlField & 0xFF);
mrf_write_long(TXNFIFO+3, frameControlField >> 8);
mrf_write_long(TXNFIFO+4, rfSettings.txSeqNumber);
mrf_write_long(TXNFIFO+5, rfSettings.panId & 0xFF);
mrf_write_long(TXNFIFO+6, rfSettings.panId >> 8);
mrf_write_long(TXNFIFO+7, pRTI->destAddr & 0xFF);
mrf_write_long(TXNFIFO+8, pRTI->destAddr >> 8);
mrf_write_long(TXNFIFO+9, rfSettings.myAddr & 0xFF);
mrf_write_long(TXNFIFO+10, rfSettings.myAddr >> 8);
// Write payload
for(i = 0; i < pRTI->length; i++) {
mrf_write_long(TXNFIFO+11+i, pRTI->pPayload[i]); // pPayload is the user defined part of data packet right ?
}
if(pRTI->cca) {
uint8_t cnt = 0;
if(!rfSettings.receiveOn) {
rf_rx_on();
}
while(!rf_rx_check_cca()) {
cnt++;
if(cnt > 100) {
return FALSE;
}
halWait(100);
}
}
tx_status_ready = 0;
mrf_write_short(TXNCON, auto_ack_enable ? 0x05 : 0x01); // Send contents of TXNFIFO as packet
//putchar(auto_ack_enable);
// Wait for Tx to finish
while(!tx_status_ready);
wait_ms(50);
success = 1;
//putchar(auto_ack_enable);
if(auto_ack_enable || pRTI->ackRequest) {
uint8_t k = mrf_read_short(TXSTAT);
success = !(k & 0x01);
//printf("ACK%c",k);
}
//printf("tx_pkt success = %d\r\n",success);
// Transmission works fine : Checked by Madhur, success = 1only when the receiver is enabled
// Increment sequence, return result
rfSettings.txSeqNumber++;
return success;
}
void rf_set_cca_mode(uint8_t mode)
{
uint8_t tmp = mrf_read_short(BBREG2);
tmp = (tmp & 0x3F) | ((mode & 0x3) << 6);
mrf_write_short(BBREG2, tmp);
}
void rf_auto_ack_disable()
{
uint8_t rxmcr = mrf_read_short(RXMCR);
mrf_write_short(RXMCR, rxmcr | (1 << 5)); // Disable auto-ack
auto_ack_enable = 0;
}
void rf_auto_ack_enable()
{
uint8_t rxmcr = mrf_read_short(RXMCR);
mrf_write_short(RXMCR, rxmcr & ~(1 << 5)); // Enable auto-ack
auto_ack_enable = 1;
}
void rf_addr_decode_disable(void)
{
uint8_t rxmcr = mrf_read_short(RXMCR);
mrf_write_short(RXMCR, rxmcr | (1 << 0)); // SET to IGNORE address field
}
void rf_addr_decode_enable(void)
{
uint8_t rxmcr = mrf_read_short(RXMCR);
mrf_write_short(RXMCR, rxmcr &~(1 << 0)); // CLEAR to USE address field
}
uint16_t mrf_pan_read(void) {
uint8_t panh = mrf_read_short(MRF_PANIDH);
return panh << 8 | mrf_read_short(MRF_PANIDL);
}
