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wrpll: fix Si549 initialization delays

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This commit is contained in:
Sebastien Bourdeauducq 2019-12-09 16:13:57 +08:00
parent 2b5213b013
commit 439576f59d
1 changed files with 4 additions and 2 deletions
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6
artiq/firmware/libboard_artiq/wrpll.rs
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@ -230,7 +230,7 @@ mod si549 {
write(dcxo, 255, 0x00)?; // PAGE
write_no_ack_value(dcxo, 7, 0x80)?; // RESET
clock::spin_us(50_000); // required? not specified in datasheet.
clock::spin_us(100_000); // required? not specified in datasheet.
write(dcxo, 255, 0x00)?; // PAGE
write(dcxo, 69, 0x00)?; // Disable FCAL override.
@ -287,7 +287,9 @@ pub fn init() {
si549::program(i2c::Dcxo::Helper, h_hsdiv, h_lsdiv, h_fbdiv)
.expect("cannot initialize helper Si549");
clock::spin_us(10_000); // Settling Time after FS Change
// Si549 Settling Time for Large Frequency Change.
// Datasheet said 10ms but it lied.
clock::spin_us(50_000);
unsafe { csr::wrpll::helper_reset_write(0); }
clock::spin_us(1);