/**************************************************************************************************
* @fn HalUARTWriteSPI
*
* @brief Transmit data bytes as a SPI packet.
*
* input parameters
*
* @param buf - pointer to the memory of the data bytes to send.
* @param len - the length of the data bytes to send.
*
* output parameters
*
* None.
*
* @return Zero for any error; otherwise, 'len'.
*/
static spiLen_t HalUARTWriteSPI(uint8 *buf, spiLen_t len)
{
// Already in Tx or Rx transaction
#ifdef RBA_UART_TO_SPI
// The RBA Bridge is not written to handle re-writes so we must
// just let it write
if (spiTxLen != 0)
#else //!RBA_UART_TO_SPI
if (spiTxLen != 0 || SPI_RDY_OUT())
#endif
{
return 0;
}
if (len > SPI_MAX_DAT_LEN)
{
len = SPI_MAX_DAT_LEN;
}
spiTxLen = len;
writeActive = 1;
#if defined HAL_SPI_MASTER
spiTxPkt[SPI_LEN_IDX] = len;
(void)memcpy(spiTxPkt + SPI_DAT_IDX, buf, len);
spiCalcFcs(spiTxPkt);
spiTxPkt[SPI_SOF_IDX] = SPI_SOF;
halDMADesc_t *ch = HAL_DMA_GET_DESC1234(HAL_SPI_CH_TX);
HAL_DMA_SET_LEN(ch, SPI_PKT_LEN(spiTxPkt)); /* DMA TX might need padding */
/* Abort any pending DMA operations */
HAL_DMA_ABORT_CH( HAL_SPI_CH_RX );
spiRxIdx = 0;
(void)memset(spiRxBuf, (DMA_PAD ^ 0xFF), SPI_MAX_PKT_LEN * sizeof(uint16));
HAL_DMA_ARM_CH(HAL_SPI_CH_RX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
/* Abort any pending DMA operations */
HAL_DMA_ABORT_CH( HAL_SPI_CH_TX );
HAL_DMA_ARM_CH(HAL_SPI_CH_TX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
SPI_SET_CSn_OUT();
while((!SPI_RDY_IN()) && (!spiRdyIsr) );
HAL_DMA_MAN_TRIGGER(HAL_SPI_CH_TX);
#elif !defined HAL_SPI_MASTER
#ifdef POWER_SAVING
/* Disable POWER SAVING when transmission is initiated */
CLEAR_SLEEP_MODE();
#endif
HAL_DMA_ARM_CH(HAL_SPI_CH_RX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
spiTxPkt[SPI_LEN_IDX] = len;
(void)memcpy(spiTxPkt + SPI_DAT_IDX, buf, len);
spiCalcFcs(spiTxPkt);
spiTxPkt[SPI_SOF_IDX] = SPI_SOF;
halDMADesc_t *ch = HAL_DMA_GET_DESC1234(HAL_SPI_CH_TX);
HAL_DMA_SET_LEN(ch, SPI_PKT_LEN(spiTxPkt) + 1); /* slave DMA TX might drop the last byte */
HAL_DMA_ARM_CH(HAL_SPI_CH_TX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
SPI_SET_RDY_OUT();
#endif
return len;
}
/**************************************************************************************************
* @fn spiParseRx
*
* @brief Parse all available bytes from the spiRxBuf[]; parse Rx data into the spiRxDat[].
*
* input parameters
*
* None.
*
* output parameters
*
* None.
*
* @return None.
*/
static void spiParseRx(void)
{
uint8 done = 0;
halIntState_t cs;
#ifdef HAL_SPI_MASTER
uint8 numNotSOF = 0;
uint8 count = 0;
SPI_SET_CSn_OUT();
#endif //HAL_SPI_MASTER
while (!done)
{
if (!SPI_NEW_RX_BYTE(spiRxIdx))
{
#if defined HAL_SPI_MASTER
// Clock a byte from slave
SPI_CLOCK_RX(1);
#else
break;
#endif
}
uint8 ch = SPI_GET_RX_BYTE(spiRxIdx);
SPI_CLR_RX_BYTE(spiRxIdx);
SPI_LEN_T_INCR(spiRxIdx);
#ifdef HAL_SPI_MASTER
// If searching for a SOF byte limit the number of bytes searched
// to SPI_FRM_LEN
if ( spiRxPktState == SPIRX_STATE_SOF )
{
count++;
numNotSOF = ( ch == SPI_SOF ) ? numNotSOF : numNotSOF + 1;
// Haven't recieved an SOF. Assume not a packet but only break if there is
// no new bytes in the RX buffer to read
if ( numNotSOF > SPI_FRM_LEN && numNotSOF == count )
{
// Clear all Rx'ed NULL bytes
while(SPI_NEW_RX_BYTE(spiRxIdx))
{
SPI_CLR_RX_BYTE(spiRxIdx);
SPI_LEN_T_INCR(spiRxIdx);
}
break;
}
}
#endif //HAL_SPI_MASTER
switch (spiRxPktState)
{
case SPIRX_STATE_SOF:
if (ch == SPI_SOF)
{
spiRxPktState = SPIRX_STATE_LEN;
/* At this point, the master has effected the protocol for ensuring that the SPI slave is
* awake, so set the spiRxLen to non-zero to prevent the slave from re-entering sleep until
* the entire packet is received - even if the master interrupts the sending of the packet
* by de-asserting/re-asserting MRDY one or more times
*/
spiRxLen = 1;
}
break;
case SPIRX_STATE_LEN:
if ((ch == 0) || (ch > SPI_MAX_DAT_LEN))
{
spiRxPktState = SPIRX_STATE_SOF;
spiRxLen = 0;
}
else
{
spiRxFcs = spiRxLen = ch;
spiRxTemp = spiRxTail;
spiRxCnt = 0;
spiRxPktState = SPIRX_STATE_DATA;
#if defined HAL_SPI_MASTER
if (!SPI_NEW_RX_BYTE(spiRxIdx)) /* Fix for simultaneous TX/RX to avoid extra clock pulses to SPI Slave */
{
halIntState_t intState;
HAL_ENTER_CRITICAL_SECTION(intState);
SPI_CLOCK_RX(ch + 1); /* Clock out the SPI Frame Data bytes and FCS */
HAL_EXIT_CRITICAL_SECTION(intState);
}
#endif
}
break;
case SPIRX_STATE_DATA:
spiRxFcs ^= ch;
spiRxDat[spiRxTemp] = ch;
SPI_LEN_T_INCR(spiRxTemp);
if (++spiRxCnt == spiRxLen)
{
spiRxPktState = SPIRX_STATE_FCS;
}
break;
case SPIRX_STATE_FCS:
spiRxPktState = SPIRX_STATE_SOF;
#ifdef POWER_SAVING
pktFound = TRUE;
#endif
if (ch == spiRxFcs)
{
spiRxTail = spiRxTemp;
}
else
{
dbgFcsByte = ch;
#ifdef RBA_UART_TO_SPI
badFcsPktCount++;
#endif
}
spiRxCnt = spiRxLen = 0;
#ifdef HAL_SPI_MASTER
// Clear any trailing empty Rx'ed bytes
// Should only receive one frame per MRDY assertion
while(SPI_NEW_RX_BYTE(spiRxIdx))
{
SPI_CLR_RX_BYTE(spiRxIdx);
SPI_LEN_T_INCR(spiRxIdx);
}
done = 1;
#endif //HAL_SPI_MASTER
break;
default:
HAL_ASSERT(0);
break;
}
}
spiTxLen = 0;
HAL_ENTER_CRITICAL_SECTION(cs);
spiRdyIsr = 0;
HAL_EXIT_CRITICAL_SECTION(cs);
#ifdef HAL_SPI_MASTER
SPI_CLR_CSn_OUT();
#ifdef RBA_UART_TO_SPI
// Must wait until slave has ended transaction because
// the RBA implementation cannot delay writes so this is a
// forced delay....
while(SPI_RDY_IN());
#endif
#else
SPI_CLR_RDY_OUT();
#endif //HAL_SPI_MASTER
}
/**************************************************************************************************
* @fn HalUARTWriteSPI
*
* @brief Transmit data bytes as a SPI packet.
*
* input parameters
*
* @param buf - pointer to the memory of the data bytes to send.
* @param len - the length of the data bytes to send.
*
* output parameters
*
* None.
*
* @return Zero for any error; otherwise, 'len'.
*/
static spiLen_t HalUARTWriteSPI(uint8 *buf, spiLen_t len)
{
if (spiTxLen != 0)
{
return 0;
}
if (len > SPI_MAX_DAT_LEN)
{
len = SPI_MAX_DAT_LEN;
}
spiTxLen = len;
#if defined HAL_SPI_MASTER
spiRdyIsr = 0;
spiTxPkt[SPI_LEN_IDX] = len;
(void)memcpy(spiTxPkt + SPI_DAT_IDX, buf, len);
spiCalcFcs(spiTxPkt);
spiTxPkt[SPI_SOF_IDX] = SPI_SOF;
halDMADesc_t *ch = HAL_DMA_GET_DESC1234(HAL_SPI_CH_TX);
HAL_DMA_SET_LEN(ch, SPI_PKT_LEN(spiTxPkt)); /* DMA TX might need padding */
/* Abort any pending DMA operations */
HAL_DMA_ABORT_CH( HAL_SPI_CH_RX );
spiRxIdx = 0;
(void)memset(spiRxBuf, (DMA_PAD ^ 0xFF), SPI_MAX_PKT_LEN * sizeof(uint16));
HAL_DMA_ARM_CH(HAL_SPI_CH_RX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
/* Abort any pending DMA operations */
HAL_DMA_ABORT_CH( HAL_SPI_CH_TX );
HAL_DMA_ARM_CH(HAL_SPI_CH_TX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
SPI_SET_CSn_OUT();
while((!SPI_RDY_IN()) && (!spiRdyIsr) );
HAL_DMA_MAN_TRIGGER(HAL_SPI_CH_TX);
#elif !defined HAL_SPI_MASTER
#ifdef POWER_SAVING
/* Disable POWER SAVING when transmission is initiated */
CLEAR_SLEEP_MODE();
#endif
SPI_CLR_RDY_OUT();
HAL_DMA_ARM_CH(HAL_SPI_CH_RX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
if ( SPI_RDY_IN() )
{
SPI_SET_RDY_OUT();
}
spiTxPkt[SPI_LEN_IDX] = len;
(void)memcpy(spiTxPkt + SPI_DAT_IDX, buf, len);
spiCalcFcs(spiTxPkt);
spiTxPkt[SPI_SOF_IDX] = SPI_SOF;
halDMADesc_t *ch = HAL_DMA_GET_DESC1234(HAL_SPI_CH_TX);
HAL_DMA_SET_LEN(ch, SPI_PKT_LEN(spiTxPkt) + 1); /* slave DMA TX might drop the last byte */
HAL_DMA_ARM_CH(HAL_SPI_CH_TX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
SPI_SET_RDY_OUT();
#endif
return len;
}