/**************************************************************************************************
* @fn sblPoll
*
* @brief Serial Boot poll & parse according to the RPC protocol.
*
* input parameters
*
* None.
*
* output parameters
*
* None.
*
* @return TRUE if the downloaded code has been enabled; FALSE otherwise.
*/
uint8 sblPoll(void)
{
uint8 ch;
while (HalUARTRead(0, &ch, 1))
{
switch (rpcSte)
{
case rpcSteSOF:
if (RPC_UART_SOF == ch)
{
rpcSte = rpcSteLen;
}
break;
case rpcSteLen:
if (ch > SBL_MAX_SIZE)
{
rpcSte = rpcSteSOF;
break;
}
else
{
rpcSte = rpcSteData;
sbFcs = sbIdx = 0;
sbLen = ch + 3; // Combine the parsing of Len, Cmd0 & Cmd1 with the data.
// no break;
}
case rpcSteData:
sbFcs ^= ch;
sbBuf[sbIdx] = ch;
if (++sbIdx == sbLen)
{
rpcSte = rpcSteFcs;
}
break;
case rpcSteFcs:
rpcSte = rpcSteSOF;
if ((sbFcs == ch) && ((sbBuf[RPC_POS_CMD0] & RPC_SUBSYSTEM_MASK) == RPC_SYS_BOOT))
{
sblProc();
return sblResp(); // Send the SB response setup in the sbBuf passed to sblProc().
}
break;
default:
HAL_SYSTEM_RESET();
break;
}
}
return FALSE;
}
/**************************************************************************************************
* @fn sblParse
*
* @brief Serial Boot parser according to the RPC UART transport.
*
* input parameters
*
* @param ch - The Rx character to parse.
*
* output parameters
*
* None.
*
* @return TRUE if the downloaded code has been enabled; FALSE otherwise.
*/
static uint8 sblParse(uint8 ch)
{
sbBuf[sbSte + sbIdx] = ch;
switch (sbSte)
{
case SBL_SOF_STATE:
if (RPC_UART_SOF == ch)
{
sbSte = SBL_LEN_STATE;
}
break;
case SBL_LEN_STATE:
sbFcs = sbIdx = 0;
sbSte = SBL_CMD1_STATE;
sbSte = ((sbLen = ch) >= SBL_MAX_SIZE) ? SBL_SOF_STATE : SBL_CMD1_STATE;
break;
case SBL_CMD1_STATE:
sbSte = SBL_CMD2_STATE;
break;
case SBL_CMD2_STATE:
sbSte = (sbLen == 0) ? SBL_FCS_STATE : SBL_DATA_STATE;
break;
case SBL_DATA_STATE:
if (++sbIdx == sbLen)
{
sbSte = SBL_FCS_STATE;
}
break;
case SBL_FCS_STATE:
sbSte = SBL_SOF_STATE;
if ((sbFcs == ch) && ((sbBuf[SBL_CMD1_STATE] & RPC_SUBSYSTEM_MASK) == RPC_SYS_BOOT))
{
sblExec(sbBuf + SBL_LEN_STATE);
return sblResp(); // Send the SB response setup in the sbBuf passed to sblExec().
}
break;
default:
break;
}
sbFcs ^= ch;
return FALSE;
}
