Macintosh-Tools
/
dingusppc
mirror of https://github.com/dingusdev/dingusppc.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

athens: allow setting custom XTAL frequency.

This commit is contained in:
Maxim Poliakovski 2024-04-15 14:37:22 +02:00
parent ffa221192d
commit 781d9b46da
2 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
devices/common/i2c/athens.cpp
View File

@ -54,7 +54,12 @@ AthensClocks::AthensClocks(uint8_t dev_addr)
// - dot clock VCO is disabled
// - dot clock = reference clock / 2
this->regs[AthensRegs::P2_MUX2] = 0x62;
}
AthensClocks::AthensClocks(uint8_t dev_addr, const float crystal_freq)
: AthensClocks(dev_addr)
{
this->xtal_freq = crystal_freq;
}
void AthensClocks::start_transaction()
@ -132,13 +137,13 @@ int AthensClocks::get_dot_freq()
switch (mux) {
case 0: // clock source -> dot cock VCO
out_freq = ATHENS_XTAL * ((float)n2 / (float)(d2 * post_div));
out_freq = this->xtal_freq * ((float)n2 / (float)(d2 * post_div));
break;
case 1: // clock source -> system clock VCO
LOG_F(WARNING, "%s: system clock VCO not supported yet!", this->name.c_str());
break;
case 2: // clock source -> crystal frequency
out_freq = ATHENS_XTAL / post_div;
out_freq = this->xtal_freq / post_div;
break;
case 3:
LOG_F(WARNING, "%s: attempt to use reserved Mux value!", this->name.c_str());

2
devices/common/i2c/athens.h
View File

@ -53,6 +53,7 @@ class AthensClocks : public I2CDevice, public HWComponent
{
public:
AthensClocks(uint8_t dev_addr);
AthensClocks(uint8_t dev_addr, const float crystal_freq);
~AthensClocks() = default;
// I2CDevice methods
@ -69,6 +70,7 @@ private:
uint8_t my_addr = 0;
uint8_t reg_num = 0;
int pos = 0;
float xtal_freq = ATHENS_XTAL;
uint8_t regs[ATHENS_NUM_REGS] = {};
};