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wire clk_sys to pll_sys, don't set refdiv (Fixes #5) #6

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wire clk_sys to pll_sys, don't set refdiv (Fixes #5) #6

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2 changes: 1 addition & 1 deletion memory.x
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Original file line number Diff line number Diff line change
Expand Up @@ -10,4 +10,4 @@ SECTIONS {
{
KEEP(*(.boot2));
} > BOOT2
} INSERT BEFORE .text;
} INSERT BEFORE .text;
10 changes: 8 additions & 2 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,11 @@ fn init(

pll::PLL::new(pll_sys).configure(1, 1500_000_000, 6, 2);
pll::PLL::new(pll_usb).configure(1, 480_000_000, 5, 2);

// Switch clk_sys to pll_sys
clocks.clk_sys_ctrl.modify(|_, w| w.auxsrc().clksrc_pll_sys() );
clocks.clk_sys_ctrl.modify(|_, w| w.src().clksrc_clk_sys_aux() );
while clocks.clk_sys_selected.read().bits() != 2 {}
}

#[entry]
Expand All @@ -95,6 +100,7 @@ fn main() -> ! {
init(p.RESETS, p.WATCHDOG, p.CLOCKS, p.XOSC, p.PLL_SYS, p.PLL_USB);

let led_pin = 25;
let half_cycle = 125000000/2;

loop {
info!("on!");
Expand All @@ -104,7 +110,7 @@ fn main() -> ! {
w
});

cortex_m::asm::delay(1_000_000);
cortex_m::asm::delay(half_cycle);

info!("off!");
p.IO_BANK0.gpio[led_pin].gpio_ctrl.write(|w| {
Expand All @@ -113,6 +119,6 @@ fn main() -> ! {
w
});

cortex_m::asm::delay(1_000_000);
cortex_m::asm::delay(half_cycle);
}
}
6 changes: 2 additions & 4 deletions src/pll.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,15 +16,13 @@ impl<T: Instance> PLL<T> {

pub fn configure(&mut self, refdiv: u32, vco_freq: u32, post_div1: u8, post_div2: u8) {
let p = &self.inner;
let ref_mhz = XOSC_MHZ / refdiv;
let fbdiv = vco_freq / (ref_mhz * 1_000_000);

// Power off in case it's already running
p.pwr.reset();
p.fbdiv_int.reset();

let ref_mhz = XOSC_MHZ / refdiv;
p.cs.write(|w| unsafe { w.bits(ref_mhz as _) });

let fbdiv = vco_freq / (ref_mhz * 1_000_000);
assert!(fbdiv >= 16 && fbdiv <= 520);
assert!((post_div1 >= 1 && post_div1 <= 7) && (post_div2 >= 1 && post_div2 <= 7));
assert!(post_div2 <= post_div1);
Expand Down