/* comedi/drivers/rtd520.h Comedi driver defines for Real Time Devices (RTD) PCI4520/DM7520 COMEDI - Linux Control and Measurement Device Interface Copyright (C) 2001 David A. Schleef This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* Created by Dan Christian, NASA Ames Research Center. See board notes in rtd520.c */ /* LAS0 Runtime Area Local Address Space 0 Offset Read Function Write Function */ #define LAS0_SPARE_00 0x0000 // - - #define LAS0_SPARE_04 0x0004 // - - #define LAS0_USER_IO 0x0008 // Read User Inputs Write User Outputs #define LAS0_SPARE_0C 0x000C // - - #define LAS0_ADC 0x0010 // Read FIFO Status Software A/D Start #define LAS0_DAC1 0x0014 // - Software D/A1 Update #define LAS0_DAC2 0x0018 // - Software D/A2 Update #define LAS0_SPARE_1C 0x001C // - - #define LAS0_SPARE_20 0x0020 // - - #define LAS0_DAC 0x0024 // - Software Simultaneous D/A1 and D/A2 Update #define LAS0_PACER 0x0028 // Software Pacer Start Software Pacer Stop #define LAS0_TIMER 0x002C // Read Timer Counters Status HDIN Software Trigger #define LAS0_IT 0x0030 // Read Interrupt Status Write Interrupt Enable Mask Register #define LAS0_CLEAR 0x0034 // Clear ITs set by Clear Mask Set Interrupt Clear Mask #define LAS0_OVERRUN 0x0038 // Read pending interrupts Clear Overrun Register #define LAS0_SPARE_3C 0x003C // - - /* LAS0 Runtime Area Timer/Counter,Dig.IO Name Local Address Function */ #define LAS0_PCLK 0x0040 // Pacer Clock value (24bit) Pacer Clock load (24bit) #define LAS0_BCLK 0x0044 // Burst Clock value (10bit) Burst Clock load (10bit) #define LAS0_ADC_SCNT 0x0048 // A/D Sample counter value (10bit) A/D Sample counter load (10bit) #define LAS0_DAC1_UCNT 0x004C // D/A1 Update counter value (10 bit) D/A1 Update counter load (10bit) #define LAS0_DAC2_UCNT 0x0050 // D/A2 Update counter value (10 bit) D/A2 Update counter load (10bit) #define LAS0_DCNT 0x0054 // Delay counter value (16 bit) Delay counter load (16bit) #define LAS0_ACNT 0x0058 // About counter value (16 bit) About counter load (16bit) #define LAS0_DAC_CLK 0x005C // DAC clock value (16bit) DAC clock load (16bit) #define LAS0_UTC0 0x0060 // 8254 TC Counter 0 User TC 0 value Load count in TC Counter 0 #define LAS0_UTC1 0x0064 // 8254 TC Counter 1 User TC 1 value Load count in TC Counter 1 #define LAS0_UTC2 0x0068 // 8254 TC Counter 2 User TC 2 value Load count in TC Counter 2 #define LAS0_UTC_CTRL 0x006C // 8254 TC Control Word Program counter mode for TC #define LAS0_DIO0 0x0070 // Digital I/O Port 0 Read Port Digital I/O Port 0 Write Port #define LAS0_DIO1 0x0074 // Digital I/O Port 1 Read Port Digital I/O Port 1 Write Port #define LAS0_DIO0_CTRL 0x0078 // Clear digital IRQ status flag/read Clear digital chip/program Port 0 #define LAS0_DIO_STATUS 0x007C // Read Digital I/O Status word Program digital control register & /* LAS0 Setup Area Name Local Address Function */ #define LAS0_BOARD_RESET 0x0100 // Board reset #define LAS0_DMA0_SRC 0x0104 // DMA 0 Sources select #define LAS0_DMA1_SRC 0x0108 // DMA 1 Sources select #define LAS0_ADC_CONVERSION 0x010C // A/D Conversion Signal select #define LAS0_BURST_START 0x0110 // Burst Clock Start Trigger select #define LAS0_PACER_START 0x0114 // Pacer Clock Start Trigger select #define LAS0_PACER_STOP 0x0118 // Pacer Clock Stop Trigger select #define LAS0_ACNT_STOP_ENABLE 0x011C // About Counter Stop Enable #define LAS0_PACER_REPEAT 0x0120 // Pacer Start Trigger Mode select #define LAS0_DIN_START 0x0124 // High Speed Digital Input Sampling Signal select #define LAS0_DIN_FIFO_CLEAR 0x0128 // Digital Input FIFO Clear #define LAS0_ADC_FIFO_CLEAR 0x012C // A/D FIFO Clear #define LAS0_CGT_WRITE 0x0130 // Channel Gain Table Write #define LAS0_CGL_WRITE 0x0134 // Channel Gain Latch Write #define LAS0_CG_DATA 0x0138 // Digital Table Write #define LAS0_CGT_ENABLE 0x013C // Channel Gain Table Enable #define LAS0_CG_ENABLE 0x0140 // Digital Table Enable #define LAS0_CGT_PAUSE 0x0144 // Table Pause Enable #define LAS0_CGT_RESET 0x0148 // Reset Channel Gain Table #define LAS0_CGT_CLEAR 0x014C // Clear Channel Gain Table #define LAS0_DAC1_CTRL 0x0150 // D/A1 output type/range #define LAS0_DAC1_SRC 0x0154 // D/A1 update source #define LAS0_DAC1_CYCLE 0x0158 // D/A1 cycle mode #define LAS0_DAC1_RESET 0x015C // D/A1 FIFO reset #define LAS0_DAC1_FIFO_CLEAR 0x0160 // D/A1 FIFO clear #define LAS0_DAC2_CTRL 0x0164 // D/A2 output type/range #define LAS0_DAC2_SRC 0x0168 // D/A2 update source #define LAS0_DAC2_CYCLE 0x016C // D/A2 cycle mode #define LAS0_DAC2_RESET 0x0170 // D/A2 FIFO reset #define LAS0_DAC2_FIFO_CLEAR 0x0174 // D/A2 FIFO clear #define LAS0_ADC_SCNT_SRC 0x0178 // A/D Sample Counter Source select #define LAS0_PACER_SELECT 0x0180 // Pacer Clock select #define LAS0_SBUS0_SRC 0x0184 // SyncBus 0 Source select #define LAS0_SBUS0_ENABLE 0x0188 // SyncBus 0 enable #define LAS0_SBUS1_SRC 0x018C // SyncBus 1 Source select #define LAS0_SBUS1_ENABLE 0x0190 // SyncBus 1 enable #define LAS0_SBUS2_SRC 0x0198 // SyncBus 2 Source select #define LAS0_SBUS2_ENABLE 0x019C // SyncBus 2 enable #define LAS0_ETRG_POLARITY 0x01A4 // External Trigger polarity select #define LAS0_EINT_POLARITY 0x01A8 // External Interrupt polarity select #define LAS0_UTC0_CLOCK 0x01AC // UTC0 Clock select #define LAS0_UTC0_GATE 0x01B0 // UTC0 Gate select #define LAS0_UTC1_CLOCK 0x01B4 // UTC1 Clock select #define LAS0_UTC1_GATE 0x01B8 // UTC1 Gate select #define LAS0_UTC2_CLOCK 0x01BC // UTC2 Clock select #define LAS0_UTC2_GATE 0x01C0 // UTC2 Gate select #define LAS0_UOUT0_SELECT 0x01C4 // User Output 0 source select #define LAS0_UOUT1_SELECT 0x01C8 // User Output 1 source select #define LAS0_DMA0_RESET 0x01CC // DMA0 Request state machine reset #define LAS0_DMA1_RESET 0x01D0 // DMA1 Request state machine reset /* LAS1 Name Local Address Function */ #define LAS1_ADC_FIFO 0x0000 // Read A/D FIFO (16bit) - #define LAS1_HDIO_FIFO 0x0004 // Read High Speed Digital Input FIFO (16bit) - #define LAS1_DAC1_FIFO 0x0008 // - Write D/A1 FIFO (16bit) #define LAS1_DAC2_FIFO 0x000C // - Write D/A2 FIFO (16bit) /* LCFG: PLX 9080 local config & runtime registers Name Local Address Function */ #define LCFG_ITCSR 0x0068 // INTCSR, Interrupt Control/Status Register #define LCFG_DMAMODE0 0x0080 // DMA Channel 0 Mode Register #define LCFG_DMAPADR0 0x0084 // DMA Channel 0 PCI Address Register #define LCFG_DMALADR0 0x0088 // DMA Channel 0 Local Address Reg #define LCFG_DMASIZ0 0x008C // DMA Channel 0 Transfer Size (Bytes) Register #define LCFG_DMADPR0 0x0090 // DMA Channel 0 Descriptor Pointer Register #define LCFG_DMAMODE1 0x0094 // DMA Channel 1 Mode Register #define LCFG_DMAPADR1 0x0098 // DMA Channel 1 PCI Address Register #define LCFG_DMALADR1 0x009C // DMA Channel 1 Local Address Register #define LCFG_DMASIZ1 0x00A0 // DMA Channel 1 Transfer Size (Bytes) Register #define LCFG_DMADPR1 0x00A4 // DMA Channel 1 Descriptor Pointer Register #define LCFG_DMACSR0 0x00A8 // DMA Channel 0 Command/Status Register #define LCFG_DMACSR1 0x00A9 // DMA Channel 0 Command/Status Register #define LCFG_DMAARB 0x00AC // DMA Arbitration Register #define LCFG_DMATHR 0x00B0 // DMA Threshold Register /*====================================================================== Resister bit definitions ======================================================================*/ // FIFO Status Word Bits (RtdFifoStatus) #define FS_DAC1_NOT_EMPTY 0x0001 // D0 - DAC1 FIFO not empty #define FS_DAC1_HEMPTY 0x0002 // D1 - DAC1 FIFO half empty #define FS_DAC1_NOT_FULL 0x0004 // D2 - DAC1 FIFO not full #define FS_DAC2_NOT_EMPTY 0x0010 // D4 - DAC2 FIFO not empty #define FS_DAC2_HEMPTY 0x0020 // D5 - DAC2 FIFO half empty #define FS_DAC2_NOT_FULL 0x0040 // D6 - DAC2 FIFO not full #define FS_ADC_NOT_EMPTY 0x0100 // D8 - ADC FIFO not empty #define FS_ADC_HEMPTY 0x0200 // D9 - ADC FIFO half empty #define FS_ADC_NOT_FULL 0x0400 // D10 - ADC FIFO not full #define FS_DIN_NOT_EMPTY 0x1000 // D12 - DIN FIFO not empty #define FS_DIN_HEMPTY 0x2000 // D13 - DIN FIFO half empty #define FS_DIN_NOT_FULL 0x4000 // D14 - DIN FIFO not full // Timer Status Word Bits (GetTimerStatus) #define TS_PCLK_GATE 0x0001 // D0 - Pacer Clock Gate [0 - gated, 1 - enabled] #define TS_BCLK_GATE 0x0002 // D1 - Burst Clock Gate [0 - disabled, 1 - running] #define TS_DCNT_GATE 0x0004 // D2 - Pacer Clock Delayed Start Trigger [0 - delay over, 1 - delay in // progress] #define TS_ACNT_GATE 0x0008 // D3 - Pacer Clock About Trigger [0 - completed, 1 - in progress] #define TS_PCLK_RUN 0x0010 // D4 - Pacer Clock Shutdown Flag [0 - Pacer Clock cannot be start // triggered only by Software Pacer Start Command, 1 - Pacer Clock can // be start triggered] // External Trigger polarity select // External Interrupt polarity select #define POL_POSITIVE 0x0 // positive edge #define POL_NEGATIVE 0x1 // negative edge // User Output Signal select (SetUout0Source, SetUout1Source) #define UOUT_ADC 0x0 // A/D Conversion Signal #define UOUT_DAC1 0x1 // D/A1 Update #define UOUT_DAC2 0x2 // D/A2 Update #define UOUT_SOFTWARE 0x3 // Software Programmable // Pacer clock select (SetPacerSource) #define PCLK_INTERNAL 1 // Internal Pacer Clock #define PCLK_EXTERNAL 0 // External Pacer Clock // A/D Sample Counter Sources (SetAdcntSource, SetupSampleCounter) #define ADC_SCNT_CGT_RESET 0x0 // needs restart with StartPacer #define ADC_SCNT_FIFO_WRITE 0x1 // A/D Conversion Signal Select (for SetConversionSelect) #define ADC_START_SOFTWARE 0x0 // Software A/D Start #define ADC_START_PCLK 0x1 // Pacer Clock (Ext. Int. see Func.509) #define ADC_START_BCLK 0x2 // Burst Clock #define ADC_START_DIGITAL_IT 0x3 // Digital Interrupt #define ADC_START_DAC1_MARKER1 0x4 // D/A 1 Data Marker 1 #define ADC_START_DAC2_MARKER1 0x5 // D/A 2 Data Marker 1 #define ADC_START_SBUS0 0x6 // SyncBus 0 #define ADC_START_SBUS1 0x7 // SyncBus 1 #define ADC_START_SBUS2 0x8 // SyncBus 2 // Burst Clock start trigger select (SetBurstStart) #define BCLK_START_SOFTWARE 0x0 // Software A/D Start (StartBurst) #define BCLK_START_PCLK 0x1 // Pacer Clock #define BCLK_START_ETRIG 0x2 // External Trigger #define BCLK_START_DIGITAL_IT 0x3 // Digital Interrupt #define BCLK_START_SBUS0 0x4 // SyncBus 0 #define BCLK_START_SBUS1 0x5 // SyncBus 1 #define BCLK_START_SBUS2 0x6 // SyncBus 2 // Pacer Clock start trigger select (SetPacerStart) #define PCLK_START_SOFTWARE 0x0 // Software Pacer Start (StartPacer) #define PCLK_START_ETRIG 0x1 // External trigger #define PCLK_START_DIGITAL_IT 0x2 // Digital interrupt #define PCLK_START_UTC2 0x3 // User TC 2 out #define PCLK_START_SBUS0 0x4 // SyncBus 0 #define PCLK_START_SBUS1 0x5 // SyncBus 1 #define PCLK_START_SBUS2 0x6 // SyncBus 2 #define PCLK_START_D_SOFTWARE 0x8 // Delayed Software Pacer Start #define PCLK_START_D_ETRIG 0x9 // Delayed external trigger #define PCLK_START_D_DIGITAL_IT 0xA // Delayed digital interrupt #define PCLK_START_D_UTC2 0xB // Delayed User TC 2 out #define PCLK_START_D_SBUS0 0xC // Delayed SyncBus 0 #define PCLK_START_D_SBUS1 0xD // Delayed SyncBus 1 #define PCLK_START_D_SBUS2 0xE // Delayed SyncBus 2 #define PCLK_START_ETRIG_GATED 0xF // External Trigger Gated controlled mode // Pacer Clock Stop Trigger select (SetPacerStop) #define PCLK_STOP_SOFTWARE 0x0 // Software Pacer Stop (StopPacer) #define PCLK_STOP_ETRIG 0x1 // External Trigger #define PCLK_STOP_DIGITAL_IT 0x2 // Digital Interrupt #define PCLK_STOP_ACNT 0x3 // About Counter #define PCLK_STOP_UTC2 0x4 // User TC2 out #define PCLK_STOP_SBUS0 0x5 // SyncBus 0 #define PCLK_STOP_SBUS1 0x6 // SyncBus 1 #define PCLK_STOP_SBUS2 0x7 // SyncBus 2 #define PCLK_STOP_A_SOFTWARE 0x8 // About Software Pacer Stop #define PCLK_STOP_A_ETRIG 0x9 // About External Trigger #define PCLK_STOP_A_DIGITAL_IT 0xA // About Digital Interrupt #define PCLK_STOP_A_UTC2 0xC // About User TC2 out #define PCLK_STOP_A_SBUS0 0xD // About SyncBus 0 #define PCLK_STOP_A_SBUS1 0xE // About SyncBus 1 #define PCLK_STOP_A_SBUS2 0xF // About SyncBus 2 // About Counter Stop Enable #define ACNT_STOP 0x0 // stop enable #define ACNT_NO_STOP 0x1 // stop disabled // DAC update source (SetDAC1Start & SetDAC2Start) #define DAC_START_SOFTWARE 0x0 // Software Update #define DAC_START_CGT 0x1 // CGT controlled Update #define DAC_START_DAC_CLK 0x2 // D/A Clock #define DAC_START_EPCLK 0x3 // External Pacer Clock #define DAC_START_SBUS0 0x4 // SyncBus 0 #define DAC_START_SBUS1 0x5 // SyncBus 1 #define DAC_START_SBUS2 0x6 // SyncBus 2 // DAC Cycle Mode (SetDAC1Cycle, SetDAC2Cycle, SetupDAC) #define DAC_CYCLE_SINGLE 0x0 // not cycle #define DAC_CYCLE_MULTI 0x1 // cycle // 8254 Operation Modes (Set8254Mode, SetupTimerCounter) #define M8254_EVENT_COUNTER 0 // Event Counter #define M8254_HW_ONE_SHOT 1 // Hardware-Retriggerable One-Shot #define M8254_RATE_GENERATOR 2 // Rate Generator #define M8254_SQUARE_WAVE 3 // Square Wave Mode #define M8254_SW_STROBE 4 // Software Triggered Strobe #define M8254_HW_STROBE 5 // Hardware Triggered Strobe (Retriggerable) // User Timer/Counter 0 Clock Select (SetUtc0Clock) #define CUTC0_8MHZ 0x0 // 8MHz #define CUTC0_EXT_TC_CLOCK1 0x1 // Ext. TC Clock 1 #define CUTC0_EXT_TC_CLOCK2 0x2 // Ext. TC Clock 2 #define CUTC0_EXT_PCLK 0x3 // Ext. Pacer Clock // User Timer/Counter 1 Clock Select (SetUtc1Clock) #define CUTC1_8MHZ 0x0 // 8MHz #define CUTC1_EXT_TC_CLOCK1 0x1 // Ext. TC Clock 1 #define CUTC1_EXT_TC_CLOCK2 0x2 // Ext. TC Clock 2 #define CUTC1_EXT_PCLK 0x3 // Ext. Pacer Clock #define CUTC1_UTC0_OUT 0x4 // User Timer/Counter 0 out #define CUTC1_DIN_SIGNAL 0x5 // High-Speed Digital Input Sampling signal // User Timer/Counter 2 Clock Select (SetUtc2Clock) #define CUTC2_8MHZ 0x0 // 8MHz #define CUTC2_EXT_TC_CLOCK1 0x1 // Ext. TC Clock 1 #define CUTC2_EXT_TC_CLOCK2 0x2 // Ext. TC Clock 2 #define CUTC2_EXT_PCLK 0x3 // Ext. Pacer Clock #define CUTC2_UTC1_OUT 0x4 // User Timer/Counter 1 out // User Timer/Counter 0 Gate Select (SetUtc0Gate) #define GUTC0_NOT_GATED 0x0 // Not gated #define GUTC0_GATED 0x1 // Gated #define GUTC0_EXT_TC_GATE1 0x2 // Ext. TC Gate 1 #define GUTC0_EXT_TC_GATE2 0x3 // Ext. TC Gate 2 // User Timer/Counter 1 Gate Select (SetUtc1Gate) #define GUTC1_NOT_GATED 0x0 // Not gated #define GUTC1_GATED 0x1 // Gated #define GUTC1_EXT_TC_GATE1 0x2 // Ext. TC Gate 1 #define GUTC1_EXT_TC_GATE2 0x3 // Ext. TC Gate 2 #define GUTC1_UTC0_OUT 0x4 // User Timer/Counter 0 out // User Timer/Counter 2 Gate Select (SetUtc2Gate) #define GUTC2_NOT_GATED 0x0 // Not gated #define GUTC2_GATED 0x1 // Gated #define GUTC2_EXT_TC_GATE1 0x2 // Ext. TC Gate 1 #define GUTC2_EXT_TC_GATE2 0x3 // Ext. TC Gate 2 #define GUTC2_UTC1_OUT 0x4 // User Timer/Counter 1 out // Interrupt Source Masks (SetITMask, ClearITMask, GetITStatus) #define IRQM_ADC_FIFO_WRITE 0x0001 // ADC FIFO Write #define IRQM_CGT_RESET 0x0002 // Reset CGT #define IRQM_CGT_PAUSE 0x0008 // Pause CGT #define IRQM_ADC_ABOUT_CNT 0x0010 // About Counter out #define IRQM_ADC_DELAY_CNT 0x0020 // Delay Counter out #define IRQM_ADC_SAMPLE_CNT 0x0040 // ADC Sample Counter #define IRQM_DAC1_UCNT 0x0080 // DAC1 Update Counter #define IRQM_DAC2_UCNT 0x0100 // DAC2 Update Counter #define IRQM_UTC1 0x0200 // User TC1 out #define IRQM_UTC1_INV 0x0400 // User TC1 out, inverted #define IRQM_UTC2 0x0800 // User TC2 out #define IRQM_DIGITAL_IT 0x1000 // Digital Interrupt #define IRQM_EXTERNAL_IT 0x2000 // External Interrupt #define IRQM_ETRIG_RISING 0x4000 // External Trigger rising-edge #define IRQM_ETRIG_FALLING 0x8000 // External Trigger falling-edge // DMA Request Sources (LAS0) #define DMAS_DISABLED 0x0 // DMA Disabled #define DMAS_ADC_SCNT 0x1 // ADC Sample Counter #define DMAS_DAC1_UCNT 0x2 // D/A1 Update Counter #define DMAS_DAC2_UCNT 0x3 // D/A2 Update Counter #define DMAS_UTC1 0x4 // User TC1 out #define DMAS_ADFIFO_HALF_FULL 0x8 // A/D FIFO half full #define DMAS_DAC1_FIFO_HALF_EMPTY 0x9 // D/A1 FIFO half empty #define DMAS_DAC2_FIFO_HALF_EMPTY 0xA // D/A2 FIFO half empty // DMA Local Addresses (0x40000000+LAS1 offset) #define DMALADDR_ADC 0x40000000 // A/D FIFO #define DMALADDR_HDIN 0x40000004 // High Speed Digital Input FIFO #define DMALADDR_DAC1 0x40000008 // D/A1 FIFO #define DMALADDR_DAC2 0x4000000C // D/A2 FIFO // Port 0 compare modes (SetDIO0CompareMode) #define DIO_MODE_EVENT 0 // Event Mode #define DIO_MODE_MATCH 1 // Match Mode // Digital Table Enable (Port 1 disable) #define DTBL_DISABLE 0 // Enable Digital Table #define DTBL_ENABLE 1 // Disable Digital Table // Sampling Signal for High Speed Digital Input (SetHdinStart) #define HDIN_SOFTWARE 0x0 // Software Trigger #define HDIN_ADC 0x1 // A/D Conversion Signal #define HDIN_UTC0 0x2 // User TC out 0 #define HDIN_UTC1 0x3 // User TC out 1 #define HDIN_UTC2 0x4 // User TC out 2 #define HDIN_EPCLK 0x5 // External Pacer Clock #define HDIN_ETRG 0x6 // External Trigger // Channel Gain Table / Channel Gain Latch #define CSC_LATCH 0 // Channel Gain Latch mode #define CSC_CGT 1 // Channel Gain Table mode // Channel Gain Table Pause Enable #define CGT_PAUSE_DISABLE 0 // Channel Gain Table Pause Disable #define CGT_PAUSE_ENABLE 1 // Channel Gain Table Pause Enable // DAC output type/range (p63) #define AOUT_UNIP5 0 // 0..+5 Volt #define AOUT_UNIP10 1 // 0..+10 Volt #define AOUT_BIP5 2 // -5..+5 Volt #define AOUT_BIP10 3 // -10..+10 Volt // Ghannel Gain Table field definitions (p61) // Gain #define GAIN1 0 #define GAIN2 1 #define GAIN4 2 #define GAIN8 3 #define GAIN16 4 #define GAIN32 5 #define GAIN64 6 #define GAIN128 7 // Input range/polarity #define AIN_BIP5 0 // -5..+5 Volt #define AIN_BIP10 1 // -10..+10 Volt #define AIN_UNIP10 2 // 0..+10 Volt // non referenced single ended select bit #define NRSE_AGND 0 // AGND referenced SE input #define NRSE_AINS 1 // AIN SENSE referenced SE input // single ended vs differential #define GND_SE 0 // Single-Ended #define GND_DIFF 1 // Differential