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hmc830_7043: enable_fpga_ibuf -> unmute

This commit is contained in:
Sebastien Bourdeauducq 2019-10-06 18:13:59 +08:00
parent 5ad65b9d30
commit ad63908aff
1 changed files with 5 additions and 6 deletions

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@ -361,15 +361,14 @@ pub mod hmc7043 {
Ok(())
}
pub fn enable_fpga_ibuf() {
pub fn unmute() {
/*
* Never missing an opportunity to be awful, the HMC7043 produces broadband noise
* prior to intialization, which can upset the FPGA.
* One mitigation technique is to disable the input buffer until the HMC7043 is
* slightly better behaved.
* prior to intialization, which can upset the AMC FPGA.
* External circuitry mutes it.
*/
unsafe {
csr::ad9154_crg::ibuf_disable_write(0);
csr::hmc7043_out_en::out_write(1);
}
}
@ -416,7 +415,7 @@ pub fn init() -> Result<(), &'static str> {
hmc7043::init();
hmc7043::test_gpo()?;
hmc7043::check_phased()?;
hmc7043::enable_fpga_ibuf();
hmc7043::unmute();
Ok(())
}