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Added support for changing the BRG constants after enabling Rx/Tx

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This commit is contained in:
Joakim Larsson Edstrom 2016-07-19 21:09:48 +02:00
parent 4a3416826d
commit 8ee69fd4b1
1 changed files with 11 additions and 4 deletions
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15
src/devices/machine/z80scc.cpp
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@ -79,9 +79,11 @@ DONE (x) (p=partly) NMOS CMOS ESCC EMSCC
// printf("TAG %lld %s%s Data:%d\n", machine().firstcpu->total_cycles(), __PRETTY_FUNCTION__, m_owner->tag(), data);
#define VERBOSE 0
#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
#define LOGPRINT(x) do { if (VERBOSE) logerror x; } while (0)
#define LOG(x) LOGPRINT(x)
#define LOGR(x)
#define LOGSETUP(x) LOGPRINT(x)
#define LOGRCV(x) LOGPRINT(x)
#if VERBOSE == 2
#define logerror printf
#endif
@ -981,6 +983,7 @@ void z80scc_channel::rcv_callback()
{
if (m_wr3 & WR3_RX_ENABLE)
{
LOG((LLFORMAT " %s() \"%s \"Channel %c receive data bit %d m_wr3:%02x\n", machine().firstcpu->total_cycles(), FUNCNAME, m_owner->tag(), 'A' + m_index, m_rxd, m_wr3));
receive_register_update_bit(m_rxd);
}
#if 1
@ -1785,6 +1788,7 @@ void z80scc_channel::do_sccreg_wr12(UINT8 data)
{
// TODO: Check if BRG enabled already and restart timer with new value in case advice above is not followed by ROM
m_wr12 = data;
update_serial();
LOG(("\"%s\": %c : %s %02x Low byte of Time Constant for Baudrate generator\n", m_owner->tag(), 'A' + m_index, FUNCNAME, data));
}
@ -1793,6 +1797,7 @@ void z80scc_channel::do_sccreg_wr13(UINT8 data)
{
// TODO: Check if BRG enabled already and restart timer with new value in case advice above is not followed by ROM
m_wr13 = data;
update_serial();
LOG(("\"%s\": %c : %s %02x High byte of Time Constant for Baudrate generator\n", m_owner->tag(), 'A' + m_index, FUNCNAME, data));
}
@ -1859,7 +1864,7 @@ void z80scc_channel::do_sccreg_wr14(UINT8 data)
/* Based on baudrate code from 8530scc.cpp */
if ( !(m_wr14 & WR14_BRG_ENABLE) && (data & WR14_BRG_ENABLE) ) // baud rate generator beeing enabled?
{
LOG(("\"%s\": %c : %s Mics Control Bits Baudrate generator enabled with \n", m_owner->tag(), 'A' + m_index, FUNCNAME));
LOG(("\"%s\": %c : %s Mics Control Bits Baudrate generator enabled with ", m_owner->tag(), 'A' + m_index, FUNCNAME));
m_brg_const = 2 + (m_wr13 << 8 | m_wr12);
if (data & WR14_BRG_SOURCE) // Do we use the PCLK as baudrate source
{
@ -1948,6 +1953,7 @@ void z80scc_channel::control_write(UINT8 data)
}
//LOG(("\n%s(%02x) reg %02x, regmask %02x\n", FUNCNAME, data, reg, regmask));
LOGSETUP((" * %s %c Reg %02x <- %02x \n", m_owner->tag(), 'A' + m_index, reg, data));
/* TODO. Sort out 80X30 & other SCC variants limitations in register access */
switch (reg)
@ -2117,7 +2123,7 @@ void z80scc_channel::receive_data(UINT8 data)
{
// receive overrun error detected
m_rx_error_fifo[m_rx_fifo_wp] |= RR1_RX_OVERRUN_ERROR; // = m_rx_error;
logerror("Receive_data() Error %02x\n", m_rr1 & (RR1_CRC_FRAMING_ERROR | RR1_RX_OVERRUN_ERROR | RR1_PARITY_ERROR));
logerror("Receive_data() Error %02x\n", m_rx_error_fifo[m_rx_fifo_wp] & (RR1_CRC_FRAMING_ERROR | RR1_RX_OVERRUN_ERROR | RR1_PARITY_ERROR));
}
else
{
@ -2453,6 +2459,7 @@ WRITE_LINE_MEMBER(z80scc_channel::write_rx)
}
#endif
LOGRCV(("%s(%d)\n", FUNCNAME, state));
m_rxd = state;
//only use rx_w when self-clocked
if(m_rxc != 0 || m_brg_rate != 0)