I found the mistake! I had to readout the RXFDB!! I configured the board_serial.c this way:
int serial_tstc( void ) { unsigned int unRegCache; if ( cCharsAvailable ) return 1;
unRegCache = *get_ser_reg_addr_channel( NS9750_SER_STAT_A, CONSOLE ); if ( unRegCache & NS9750_SER_STAT_A_RBC ) { *get_ser_reg_addr_channel( NS9750_SER_STAT_A, CONSOLE ) = NS9750_SER_STAT_A_RXFDB_FULL; *get_ser_reg_addr_channel( NS9750_SER_STAT_A, CONSOLE ) = NS9750_SER_STAT_A_RBC; unRegCache = *get_ser_reg_addr_channel( NS9750_SER_STAT_A, CONSOLE ); }
if ( unRegCache & NS9750_SER_STAT_A_RRDY ) { cCharsAvailable = (unRegCache & NS9750_SER_STAT_A_RXFDB_FULL)>>20; if ( !cCharsAvailable ) cCharsAvailable = 4;
unCharCache = *get_ser_reg_addr_channel( NS9750_SER_FIFO, CONSOLE ); return 1; }
I changed NS9750_SER_STAT_A_RXFDB_MA to NS9750_SER_STAT_A_RXFDB_FULL!!
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