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dds: fix full amplitude scale

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occheung 2020-08-27 11:15:42 +08:00
parent 649b5b498b
commit 1de13d6f3a
1 changed files with 10 additions and 2 deletions
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12
src/dds.rs
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@ -270,13 +270,21 @@ where
let resolutions :[u64; 3] = [1 << 32, 1 << 16, 1 << 14]; let resolutions :[u64; 3] = [1 << 32, 1 << 16, 1 << 14];
let ftw = (resolutions[0] * f_out / self.f_sys_clk) as u32; let ftw = (resolutions[0] * f_out / self.f_sys_clk) as u32;
let pow = ((resolutions[1] as f64) * phase_offset / 360.0) as u16; let pow = ((resolutions[1] as f64) * phase_offset / 360.0) as u16;
let asf = ((resolutions[2] as f64) * amp_scale_factor) as u16; let asf :u16 = if amp_scale_factor == 1.0 {
0x3FFF
} else {
((resolutions[2] as f64) * amp_scale_factor) as u16
};
// Setup configuration registers before writing single tone register // Setup configuration registers before writing single tone register
self.set_configurations(&mut [ self.set_configurations(&mut [
(DDSCFRMask::RAM_ENABLE, 0), (DDSCFRMask::RAM_ENABLE, 0),
(DDSCFRMask::DIGITAL_RAMP_ENABLE, 0), (DDSCFRMask::DIGITAL_RAMP_ENABLE, 0),
(DDSCFRMask::OSK_ENABLE, 0),
(DDSCFRMask::PARALLEL_DATA_PORT_ENABLE, 0), (DDSCFRMask::PARALLEL_DATA_PORT_ENABLE, 0),
])?; ])?;
self.set_configurations(&mut [
(DDSCFRMask::EN_AMP_SCALE_SINGLE_TONE_PRO, 1),
])?;
// Transfer single tone profile data // Transfer single tone profile data
self.write_register(0x0E + profile, &mut [ self.write_register(0x0E + profile, &mut [
((asf >> 8 ) & 0xFF) as u8, ((asf >> 8 ) & 0xFF) as u8,
@ -288,7 +296,7 @@ where
((ftw >> 8 ) & 0xFF) as u8, ((ftw >> 8 ) & 0xFF) as u8,
((ftw >> 0 ) & 0xFF) as u8, ((ftw >> 0 ) & 0xFF) as u8,
]) ])
} }
} }