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main: pll initialization

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This commit is contained in:
Zack Buhman 2025-09-17 00:05:20 -05:00
parent 60ccbef127
commit 6825999536
1 changed files with 21 additions and 0 deletions
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21
main.c
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@ -222,6 +222,27 @@ int main()
int command_read = voodoo2->fbiInit2 & 0xff;
printf("dac read: DAC__RS__COMMAND: m: %02x\n", command_read);
/*
pixel clock: 40MHz
graphics/memory clock: 44.6MHz
*/
int m = 54;
int n = 67;
dac_write_pll_16(voodoo2, DAC__PLL_PARAMETER__CLK0_f0_PLL, m, n);
mn_t clk0_f0_res = dac_read_pll_16(voodoo2, DAC__PLL_PARAMETER__CLK0_f0_PLL);
printf("dac read: DAC__PLL_PARAMETER__CLK0_f0_PLL: m: %02x n: %02x\n",
clk0_f0_res.m, clk0_f0_res.n);
int pll_control
= DAC__PLL_CONTROL__CLK0_SELECT(0) // f0
| DAC__PLL_CONTROL__CLK1_SELECT(0) // fA
| DAC__PLL_CONTROL__ENABLE_INTERNAL_CLOCK_SELECT;
dac_write_pll_8(voodoo2, DAC__PLL_PARAMETER__PLL_CONTROL, pll_control);
mn_t pll_control_res = dac_read_pll_16(voodoo2, DAC__PLL_PARAMETER__PLL_CONTROL);
printf("dac read: DAC__PLL_PARAMETER__PLL_CONTROL: m: %02x\n",
pll_control_res.m);
////////////////////////////////////////////////////////////////////////
// cleanup
////////////////////////////////////////////////////////////////////////