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Flush serial port before sending sync pattern

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This commit is contained in:
Azim Khan 2018-02-17 16:00:06 +00:00
parent 26a455c021
commit 506849b5c2
1 changed files with 3 additions and 8 deletions
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11
programs/x509/cert_write.c
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@ -1057,7 +1057,7 @@ int serial_xfer( const char * serial_port, const unsigned char * tx_buf,
size_t tx_buf_len, unsigned char * rx_buf, size_t rx_buf_len, size_t tx_buf_len, unsigned char * rx_buf, size_t rx_buf_len,
size_t * rx_len ) size_t * rx_len )
{ {
char comm_name[20]; char c, comm_name[20];
HANDLE hComm; HANDLE hComm;
DCB dcbConfig; DCB dcbConfig;
COMMTIMEOUTS commTimeout; COMMTIMEOUTS commTimeout;
@ -1081,11 +1081,6 @@ int serial_xfer( const char * serial_port, const unsigned char * tx_buf,
if( GetCommState( hComm, &dcbConfig ) ) if( GetCommState( hComm, &dcbConfig ) )
{ {
/*
dcbConfig.fBinary = TRUE;
dcbConfig.fParity = TRUE;
*/
dcbConfig.BaudRate = REMOTE_KEY_SERIAL_BAUD; dcbConfig.BaudRate = REMOTE_KEY_SERIAL_BAUD;
dcbConfig.Parity = NOPARITY; dcbConfig.Parity = NOPARITY;
dcbConfig.ByteSize = 8; dcbConfig.ByteSize = 8;
@ -1123,6 +1118,8 @@ int serial_xfer( const char * serial_port, const unsigned char * tx_buf,
break; break;
/* Flush data on serial before sending sync pattern */
while( ReadFile( hComm, &c, sizeof(c), &xfer_len, NULL ) && xfer_len != 0 );
/* Sync with peer */ /* Sync with peer */
if( !WriteFile( hComm, REMOTE_KEY_MAGIC_PATTERN, strlen(REMOTE_KEY_MAGIC_PATTERN), if( !WriteFile( hComm, REMOTE_KEY_MAGIC_PATTERN, strlen(REMOTE_KEY_MAGIC_PATTERN),
&xfer_len, NULL ) ) &xfer_len, NULL ) )
@ -1130,8 +1127,6 @@ int serial_xfer( const char * serial_port, const unsigned char * tx_buf,
while( sync_pattern_idx != strlen(REMOTE_KEY_MAGIC_PATTERN) ) while( sync_pattern_idx != strlen(REMOTE_KEY_MAGIC_PATTERN) )
{ {
char c;
if( !ReadFile( hComm, &c, sizeof(c), &xfer_len, NULL ) ) if( !ReadFile( hComm, &c, sizeof(c), &xfer_len, NULL ) )
break; break;
if ( c == REMOTE_KEY_MAGIC_PATTERN[sync_pattern_idx] ) if ( c == REMOTE_KEY_MAGIC_PATTERN[sync_pattern_idx] )