MrDham
5 years ago
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/* Arduino WaveHC Library
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* Copyright (C) 2009 by William Greiman |
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*
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* This file is part of the Arduino WaveHC Library |
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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*
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* This Library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*
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* You should have received a copy of the GNU General Public License |
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* along with the Arduino WaveHC Library. If not, see |
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* <http://www.gnu.org/licenses/>.
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*/ |
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/**
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* Macros and inline functions for MCP4921 DAC |
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*/
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#ifndef mcpDac_h |
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#define mcpDac_h |
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#include <avr/io.h> |
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#include "OTPinDefs.h" |
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//------------------------------------------------------------------------------
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#define mcpDacCsLow() MCP_DAC_CS_PORT &= ~_BV(MCP_DAC_CS_BIT) |
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#define mcpDacCsHigh() MCP_DAC_CS_PORT |= _BV(MCP_DAC_CS_BIT) |
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#define mcpDac2CsLow() MCP_DAC_CS_PORT &= ~_BV(MCP_DAC2_CS_BIT) |
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#define mcpDac2CsHigh() MCP_DAC_CS_PORT |= _BV(MCP_DAC2_CS_BIT) |
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#define mcpDacSckLow() MCP_DAC_SCK_PORT &= ~_BV(MCP_DAC_SCK_BIT) |
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#define mcpDacSckHigh() MCP_DAC_SCK_PORT |= _BV(MCP_DAC_SCK_BIT) |
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#define mcpDacSckPulse() {mcpDacSckHigh();mcpDacSckLow();} |
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#define mcpDacSdiLow() MCP_DAC_SDI_PORT &= ~_BV(MCP_DAC_SDI_BIT) |
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#define mcpDacSdiHigh() MCP_DAC_SDI_PORT |= _BV(MCP_DAC_SDI_BIT) |
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#define mcpDacSdiSet(v) if(v){mcpDacSdiHigh();}else{mcpDacSdiLow();} |
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// send bit b of d
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#define mcpDacSendBit(d, b) {mcpDacSdiSet(d&_BV(b));mcpDacSckPulse();} |
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//------------------------------------------------------------------------------
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// init dac I/O ports
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inline void mcpDacInit(void) { |
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// set all to output mode
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MCP_DAC_CS_DDR |= _BV(MCP_DAC_CS_BIT); |
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MCP_DAC2_CS_DDR |= _BV(MCP_DAC2_CS_BIT); |
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MCP_DAC_SCK_DDR |= _BV(MCP_DAC_SCK_BIT); |
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MCP_DAC_SDI_DDR |= _BV(MCP_DAC_SDI_BIT); |
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// chip select high
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mcpDacCsHigh(); |
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mcpDac2CsHigh(); |
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#if USE_MCP_DAC_LDAC |
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// LDAC low always - use unbuffered mode
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MCP_DAC_LDAC_DDR |= _BV(MCP_DAC_LDAC_BIT); |
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MCP_DAC_LDAC_PORT &= ~_BV(MCP_DAC_LDAC_BIT); |
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#endif // USE_MCP_DAC_LDAC
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} |
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//------------------------------------------------------------------------------
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// send 12 bits to dac
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// trusted compiler to optimize and it does
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// csLow to csHigh takes 8 - 9 usec on a 16 MHz Arduino
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inline void mcpDacSend(uint16_t data) { |
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mcpDacCsLow(); |
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// send DAC config bits
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mcpDacSdiLow(); |
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mcpDacSckPulse(); // DAC A
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mcpDacSdiHigh(); |
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mcpDacSckPulse(); // buffered REF
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mcpDacSckPulse(); // 1X gain
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mcpDacSckPulse(); // no SHDN
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// send 12 data bits
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mcpDacSendBit(data, 11); |
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mcpDacSendBit(data, 10); |
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mcpDacSendBit(data, 9); |
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mcpDacSendBit(data, 8); |
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mcpDacSendBit(data, 7); |
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mcpDacSendBit(data, 6); |
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mcpDacSendBit(data, 5); |
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mcpDacSendBit(data, 4); |
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mcpDacSendBit(data, 3); |
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mcpDacSendBit(data, 2); |
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mcpDacSendBit(data, 1); |
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mcpDacSendBit(data, 0); |
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mcpDacCsHigh(); |
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} |
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inline void mcpDac2ASend(uint16_t data) { |
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mcpDac2CsLow(); |
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// send DAC config bits
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mcpDacSdiLow(); |
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mcpDacSckPulse(); // DAC A
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mcpDacSdiHigh(); |
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mcpDacSckPulse(); // buffered REF
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mcpDacSckPulse(); // 1X gain
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mcpDacSckPulse(); // no SHDN
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// send 12 data bits
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mcpDacSendBit(data, 11); |
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mcpDacSendBit(data, 10); |
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mcpDacSendBit(data, 9); |
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mcpDacSendBit(data, 8); |
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mcpDacSendBit(data, 7); |
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mcpDacSendBit(data, 6); |
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mcpDacSendBit(data, 5); |
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mcpDacSendBit(data, 4); |
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mcpDacSendBit(data, 3); |
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mcpDacSendBit(data, 2); |
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mcpDacSendBit(data, 1); |
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mcpDacSendBit(data, 0); |
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mcpDac2CsHigh(); |
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} |
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inline void mcpDac2BSend(uint16_t data) { |
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mcpDac2CsLow(); |
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// send DAC config bits
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mcpDacSdiHigh(); |
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mcpDacSckPulse(); // DAC A
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mcpDacSdiHigh(); |
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mcpDacSckPulse(); // buffered REF
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mcpDacSckPulse(); // 1X gain
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mcpDacSckPulse(); // no SHDN
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// send 12 data bits
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mcpDacSendBit(data, 11); |
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mcpDacSendBit(data, 10); |
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mcpDacSendBit(data, 9); |
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mcpDacSendBit(data, 8); |
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mcpDacSendBit(data, 7); |
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mcpDacSendBit(data, 6); |
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mcpDacSendBit(data, 5); |
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mcpDacSendBit(data, 4); |
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mcpDacSendBit(data, 3); |
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mcpDacSendBit(data, 2); |
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mcpDacSendBit(data, 1); |
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mcpDacSendBit(data, 0); |
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mcpDac2CsHigh(); |
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} |
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#endif //mcpDac_h
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