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escc: Add Channel Enhancement registers.

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This commit is contained in:
joevt 2024-04-26 00:44:43 -07:00 committed by dingusdev
parent 59fba285b5
commit 181e1d2e46
2 changed files with 32 additions and 5 deletions
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34
devices/serial/escc.cpp
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -101,12 +101,10 @@ uint8_t EsccController::read(uint8_t reg_offset)
value = this->ch_a->receive_byte();
break;
case EsccReg::Enh_Reg_B:
LOG_F(WARNING, "ESCC_B: reading from unimplemented register 0x%x", reg_offset);
value = 0;
value = this->ch_b->get_enh_reg();
break;
case EsccReg::Enh_Reg_A:
LOG_F(WARNING, "ESCC_A: reading from unimplemented register 0x%x", reg_offset);
value = 0;
value = this->ch_a->get_enh_reg();
break;
default:
LOG_F(WARNING, "ESCC: reading from unimplemented register 0x%x", reg_offset);
@ -131,6 +129,12 @@ void EsccController::write(uint8_t reg_offset, uint8_t value)
case EsccReg::Port_A_Data:
this->ch_a->send_byte(value);
break;
case EsccReg::Enh_Reg_B:
this->ch_b->set_enh_reg(value);
break;
case EsccReg::Enh_Reg_A:
this->ch_a->set_enh_reg(value);
break;
default:
LOG_F(9, "ESCC: writing 0x%X to unimplemented register 0x%x", value, reg_offset);
}
@ -336,6 +340,26 @@ uint8_t EsccChannel::receive_byte()
return c;
}
uint8_t EsccChannel::get_enh_reg()
{
return this->enh_reg;
}
void EsccChannel::set_enh_reg(uint8_t value)
{
uint8_t changed_bits = value ^ this->enh_reg;
if (changed_bits & 0x10) {
if (value & 0x10)
LOG_F(ERROR, "%s: CTS connected to GPIO; DCD connected to GND", this->name.c_str());
else
LOG_F(INFO, "%s: CTS connected to TRXC_In_l; DCD connected to GPIO", this->name.c_str());
this->enh_reg = value & 0x10;
} else if (changed_bits & ~0x10) {
if (value & ~0x10)
LOG_F(ERROR, "%s: Ignoring attempt to set Enh_Reg bits 0x%02x", this->name.c_str(), value & ~0x10);
}
}
void EsccChannel::dma_start_tx()
{

3
devices/serial/escc.h
View File

@ -104,6 +104,8 @@ public:
void write_reg(int reg_num, uint8_t value);
void send_byte(uint8_t value);
uint8_t receive_byte();
uint8_t get_enh_reg();
void set_enh_reg(uint8_t value);
void set_dma_channel(int dir_index, DmaBidirChannel *dma_ch) {
this->dma_ch[dir_index] = dma_ch;
@ -163,6 +165,7 @@ private:
uint8_t dpll_clock_src;
uint8_t brg_active;
uint8_t brg_clock_src;
uint8_t enh_reg = 0;
std::unique_ptr<CharIoBackEnd> chario;
};