Hi, I would like to reuse some chunks of code from PER TEST software (www.ti.com/.../swru296b.pdf) but some points are unclear to me
File cc120x_per_test_api.c
Receiver code includes this block
/* The RX FIFO is not empty, process contents */
cc120xSpiReadRxFifo(&rxLength, 1);
/* Check that the packet length just read + status bytes(2B) + length byte match the RXBYTES */
/* If these are not equal:
* - Packet is not like expected
*/
if(rxBytes != (rxLength+3))
{
/* This is a fault FIFO condition -> clean FIFO and register a sync detection */
/* IDLE -> FLUSH RX FIFO -> RX */
perCC120xRxIdle();
perCC120xEnterRx();
/* Report that a sync was detected */
rxData_tmp.rssi = perCC120xRead8BitRssi();
return;
Questions:
1. if(rxBytes != (rxLength+3))
Is this checking have the same meaning as below from cc120x_easy_link_rx.c:
// Read marcstate to check for RX FIFO error
cc120xSpiReadReg(CC120X_MARCSTATE, &marcStatus, 1);
// Mask out marcstate bits and check if we have a RX FIFO error
if((marcStatus & 0x1F) == RX_FIFO_ERROR){
So is it just another way of RX FIFO error checking?
2. Comment below mentions FLUSH RX FIFO. But I do not see explicit function like trxSpiCmdStrobe(CC120X_SFRX) inside perCC120xRxIdle()and perCC120xEnterRx():
/* This is a fault FIFO condition -> clean FIFO and register a sync detection */
/* IDLE -> FLUSH RX FIFO -> RX */
perCC120xRxIdle();
perCC120xEnterRx();
/*******************************************************************************
* @fn perCC120xRxIdle
*
* @brief Radio state is switched from RX to IDLE
*
* input parameters
*
* @param none
*
* output parameters
*
* @return void
*/
static void perCC120xRxIdle(void)
{
/* Disable pin interrupt */
trxDisableInt();
/* Strobe IDLE */
trxSpiCmdStrobe(CC120X_SIDLE);
/* Wait until chip is in IDLE */
while(trxSpiCmdStrobe(CC120X_SNOP) & 0xF0);
/* Clear pin interrupt flag */
trxClearIntFlag();
return;
}
/*******************************************************************************
* @fn perCC120xIdleRx
*
* @brief Radio state is switched from Idle to RX. Function assumes that
* radio is in IDLE when called.
*
* input parameters
*
* @param none
*
* output parameters
*
* @return void
*/
static void perCC120xIdleRx(void)
{
trxClearIntFlag();
trxSpiCmdStrobe(CC120X_SRX);
trxEnableInt();
return;
}
/*******************************************************************************
How FIFO cleaning is implemented here?
