First version of the MAX2871 shield library. Includes demo program with terminal for setting frequency on channel A.
MAX2871.cpp
- Committer:
- MI
- Date:
- 2017-07-31
- Revision:
- 0:9f09f1b58389
- Child:
- 1:40b397b31d13
File content as of revision 0:9f09f1b58389:
/******************************************************************************* * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include "MAX2871.h" #include <math.h> #include <stdio.h> //**************************************************************************** MAX2871::MAX2871(SPI &spiBus, PinName le): m_spiBus(spiBus), m_le(le, 1) { f_reference = 50.0; reg0.all = 0x007d0000; reg1.all = 0x2000fff9; reg2.all = 0x00004042; reg3.all = 0x0000000b; reg4.all = 0x6180b23c; reg5.all = 0x00400005; reg6.all = 0x00000000; update(); } //**************************************************************************** MAX2871::~MAX2871() { //empty block } //**************************************************************************** void MAX2871::writeRegister(const uint32_t data) { m_le = 0; m_spiBus.write((0xFF000000 & data) >> 24); m_spiBus.write((0x00FF0000 & data) >> 16); m_spiBus.write((0x0000FF00 & data) >> 8); m_spiBus.write( 0x000000FF & data); m_le = 1; } //**************************************************************************** void MAX2871::readRegister6() { uint32_t raw, reg6read; reg5.bits.mux = 1; reg2.bits.mux = 0x4; writeRegister(reg5.all); writeRegister(reg2.all); writeRegister(0x00000006); m_spiBus.format(8,1); raw = m_spiBus.write(0x00); reg6read = (reg6read & 0x01FFFFF) + (raw << 25); raw = m_spiBus.write(0x00); reg6read = (reg6read & 0xFE01FFFF) + (raw << 17); raw = m_spiBus.write(0x00); reg6read = (reg6read & 0xFFFE01FF) + (raw << 9); raw = m_spiBus.write(0x00); reg6read = (reg6read & 0xFFFFFE01) + (raw << 1); raw = m_spiBus.write(0x00); reg6read = (reg6read & 0xFFFFFFFE) + (raw >> 7); reg6.all = reg6read; m_spiBus.format(8,0); } //**************************************************************************** void MAX2871::update() { writeRegister(reg5.all); writeRegister(reg4.all); writeRegister(reg3.all); writeRegister(reg2.all); writeRegister(reg1.all); writeRegister(reg0.all); } //**************************************************************************** void MAX2871::frequency(const float freq) { uint32_t n,frac,m = 0; float pll_coefficient; float f_pfd = f_reference*(1+reg2.bits.dbr)/(reg2.bits.r*(1+reg2.bits.rdiv2)); reg4.bits.diva = 0; while(freq*powf(2,reg4.bits.diva) < 3000.0) { reg4.bits.diva = reg4.bits.diva + 1; } pll_coefficient = freq*powf(2,reg4.bits.diva)/f_pfd; n = floor(pll_coefficient); pll_coefficient = pll_coefficient - n; m = 2500; frac = roundf(m*pll_coefficient); reg0.bits.frac = frac; reg0.bits.n = n; reg1.bits.m = m; update(); }