?? alt_up_rs232.c
字號:
#include "alt_up_rs232.h"
int alt_up_rs232_enable_read_interrupt()
{
alt_u32 ctrl_reg;
ctrl_reg = IORD_ALT_UP_RS232_CONTROL(ALT_UP_RS232_BASE);
// set RE to 1 while maintaining other bits the same
ctrl_reg |= ALT_UP_RS232_CONTROL_RE_MSK;
IOWR_ALT_UP_RS232_CONTROL(ALT_UP_RS232_BASE, ctrl_reg);
return 0;
}
int alt_up_rs232_disable_read_interrupt()
{
alt_u32 ctrl_reg;
ctrl_reg = IORD_ALT_UP_RS232_CONTROL(ALT_UP_RS232_BASE);
// set RE to 0 while maintaining other bits the same
ctrl_reg &= ~ALT_UP_RS232_CONTROL_RE_MSK;
IOWR_ALT_UP_RS232_CONTROL(ALT_UP_RS232_BASE, ctrl_reg);
return 0;
}
unsigned alt_up_rs232_get_num_chars_in_read_FIFO()
{
alt_u16 ravail = 0;
// we can only read the 16 bits for RAVAIL --- a read of DATA will discard the data
ravail = IORD_16DIRECT(IOADDR_ALT_UP_RS232_DATA(ALT_UP_RS232_BASE), 2);
return ravail;
}
unsigned alt_up_rs232_get_num_chars_in_write_FIFO()
{
alt_u32 ctrl_reg;
ctrl_reg = IORD_16DIRECT(ALT_UP_RS232_BASE, 1);
return (ctrl_reg & ALT_UP_RS232_CONTROL_WSPACE_MSK) >> ALT_UP_RS232_CONTROL_WSPACE_OFST;
}
int alt_up_rs232_check_parity(alt_u32 data_reg)
{
unsigned parity_error = (data_reg & ALT_UP_RS232_DATA_PE_MSK) >> ALT_UP_RS232_DATA_PE_OFST;
return (parity_error ? -1 : 0);
}
int alt_up_rs232_write_data(alt_u8 data)
{
alt_u32 data_reg;
data_reg = IORD_ALT_UP_RS232_DATA(ALT_UP_RS232_BASE);
// we can write directly without thinking about other bit fields for this
// case ONLY, because only DATA field of the data register is writable
IOWR_ALT_UP_RS232_DATA(ALT_UP_RS232_BASE, (data>>ALT_UP_RS232_DATA_DATA_OFST) & ALT_UP_RS232_DATA_DATA_MSK);
return 0;
}
int alt_up_rs232_read_data(alt_u8 *data)
{
alt_u32 data_reg;
data_reg = IORD_ALT_UP_RS232_DATA(ALT_UP_RS232_BASE);
*data = (data_reg & ALT_UP_RS232_DATA_DATA_MSK) >> ALT_UP_RS232_DATA_DATA_OFST;
return alt_up_rs232_check_parity(data_reg);
}
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