From: Ian Abbott Date: Mon, 12 Nov 2007 14:58:01 +0000 (+0000) Subject: Use arrays to look up ai gain bits and polarity. X-Git-Tag: v0_7_76~69 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=eb239c0269b393eac1db8bcd17ac7a086f327353;p=comedi.git Use arrays to look up ai gain bits and polarity. --- diff --git a/comedi/drivers/amplc_pci230.c b/comedi/drivers/amplc_pci230.c index 93da977f..9958833f 100644 --- a/comedi/drivers/amplc_pci230.c +++ b/comedi/drivers/amplc_pci230.c @@ -321,6 +321,12 @@ static const comedi_lrange pci230_ai_range = { 7, { } }; +/* PCI230 analogue gain bits for each input range. */ +static const unsigned char pci230_ai_gain[7] = { 0, 1, 2, 3, 1, 2, 3 }; + +/* PCI230 adccon bipolar flag for each analogue input range. */ +static const unsigned char pci230_ai_bipolar[7] = { 1, 1, 1, 1, 0, 0, 0 }; + /* PCI230 analogue output range table */ static const comedi_lrange pci230_ao_range = { 2, { UNI_RANGE(10), @@ -328,6 +334,9 @@ static const comedi_lrange pci230_ao_range = { 2, { } }; +/* PCI230 daccon bipolar flag for each analogue output range. */ +static const unsigned char pci230_ao_bipolar[2] = { 0, 1 }; + /* * The comedi_driver structure tells the Comedi core module * which functions to call to configure/deconfigure (attach/detach) @@ -661,8 +670,9 @@ static int pci230_detach(comedi_device * dev) static int pci230_ai_rinsn(comedi_device * dev, comedi_subdevice * s, comedi_insn * insn, lsampl_t * data) { - int n, i; - int chan, range, aref; + unsigned int n, i; + unsigned int chan, range, aref; + unsigned int gainshift; unsigned int status; unsigned int adccon, adcen, adcg; @@ -671,10 +681,8 @@ static int pci230_ai_rinsn(comedi_device * dev, comedi_subdevice * s, range = CR_RANGE(insn->chanspec); aref = CR_AREF(insn->chanspec); - /* If bit 2 of range unset, range is referring to bipolar element in - * range table */ adccon = PCI230_ADC_TRIG_SW | PCI230_ADC_FIFO_RESET; - devpriv->ai_bipolar = !PCI230_TEST_BIT(range, 2); + devpriv->ai_bipolar = pci230_ai_bipolar[range]; if (aref == AREF_DIFF) { /* Differential. */ if (chan >= s->n_chan / 2) { @@ -683,27 +691,20 @@ static int pci230_ai_rinsn(comedi_device * dev, comedi_subdevice * s, "0 to %u\n", dev->minor, (s->n_chan / 2) - 1); return -EINVAL; } - adcen = 3 << 2 * chan; + gainshift = chan * 2; + adcen = 3 << gainshift; /* Enable channel pair */ adccon |= PCI230_ADC_IM_DIF; - if (devpriv->ai_bipolar) { - adccon |= PCI230_ADC_IR_BIP; - adcg = range << (2 * chan - 2 * chan % 2); - } else { - adccon |= PCI230_ADC_IR_UNI; - adcg = ((range & (~4)) + 1) << (2 * chan - - 2 * chan % 2); - } } else { /* Single ended. */ adcen = 1 << chan; + gainshift = chan & ~1; adccon |= PCI230_ADC_IM_SE; - if (devpriv->ai_bipolar) { - adccon |= PCI230_ADC_IR_BIP; - adcg = range << (chan - chan % 2); - } else { - adccon |= PCI230_ADC_IR_UNI; - adcg = ((range & (~4)) + 1) << (chan - chan % 2); - } + } + adcg = pci230_ai_gain[range] << gainshift; + if (devpriv->ai_bipolar) { + adccon |= PCI230_ADC_IR_BIP; + } else { + adccon |= PCI230_ADC_IR_UNI; } /* Enable only this channel in the scan list - otherwise by default @@ -759,7 +760,7 @@ static int pci230_ao_winsn(comedi_device * dev, comedi_subdevice * s, /* Set range - see analogue output range table; 0 => unipolar 10V, * 1 => bipolar +/-10V range scale */ - devpriv->ao_bipolar = PCI230_TEST_BIT(range, PCI230_DAC_BIP_BIT); + devpriv->ao_bipolar = pci230_ao_bipolar[range]; outw(range, dev->iobase + PCI230_DACCON); /* Writing a list of values to an AO channel is probably not @@ -989,7 +990,7 @@ static int pci230_ao_cmd(comedi_device * dev, comedi_subdevice * s) /* Set range - see analogue output range table; 0 => unipolar 10V, * 1 => bipolar +/-10V range scale */ range = CR_RANGE(cmd->chanlist[0]); - devpriv->ao_bipolar = PCI230_TEST_BIT(range, PCI230_DAC_BIP_BIT); + devpriv->ao_bipolar = pci230_ao_bipolar[range]; outw(range, dev->iobase + PCI230_DACCON); /* Set the counter timers to the specified sampling frequency. @@ -1188,7 +1189,7 @@ static int pci230_ai_cmdtest(comedi_device * dev, comedi_subdevice * s, chan = CR_CHAN(cmd->chanlist[n]); range = CR_RANGE(cmd->chanlist[n]); aref = CR_AREF(cmd->chanlist[n]); - polarity = PCI230_TEST_BIT(range, 2); + polarity = pci230_ai_bipolar[range]; /* Only the first half of the channels are available if * differential. (These are remapped in software. In * hardware, only the even channels are available.) */ @@ -1277,7 +1278,7 @@ static int pci230_ai_cmdtest(comedi_device * dev, comedi_subdevice * s, static int pci230_ai_cmd(comedi_device * dev, comedi_subdevice * s) { - int i, chan, range, diff; + unsigned int i, chan, range, diff; unsigned int adccon, adcen, adcg; unsigned int zgat; @@ -1328,37 +1329,22 @@ static int pci230_ai_cmd(comedi_device * dev, comedi_subdevice * s) adcg = 0; adcen = 0; - /* If bit 2 of range unset, range is referring to bipolar element in - * range table */ range = CR_RANGE(cmd->chanlist[0]); - devpriv->ai_bipolar = !PCI230_TEST_BIT(range, 2); + devpriv->ai_bipolar = pci230_ai_bipolar[range]; if (devpriv->ai_bipolar) { adccon |= PCI230_ADC_IR_BIP; - for (i = 0; i < cmd->chanlist_len; i++) { - chan = CR_CHAN(cmd->chanlist[i]); - range = CR_RANGE(cmd->chanlist[i]); - if (diff) { - adcg |= range << (2 * chan - 2 * chan % 2); - adcen |= 3 << 2 * chan; - } else { - adcg |= range << (chan - chan % 2); - adcen |= 1 << chan; - } - } } else { adccon |= PCI230_ADC_IR_UNI; - for (i = 0; i < cmd->chanlist_len; i++) { - chan = CR_CHAN(cmd->chanlist[i]); - range = CR_RANGE(cmd->chanlist[i]); - if (diff) { - adcg |= ((range & (~4)) + 1) << (2 * chan - - 2 * chan % 2); - adcen |= 3 << 2 * chan; - } else { - adcg |= ((range & (~4)) + 1) << (chan - - chan % 2); - adcen |= 1 << chan; - } + } + for (i = 0; i < cmd->chanlist_len; i++) { + chan = CR_CHAN(cmd->chanlist[i]); + range = CR_RANGE(cmd->chanlist[i]); + if (diff) { + adcg |= pci230_ai_gain[range] << (2 * chan); + adcen |= 3 << (2 * chan); + } else { + adcg |= pci230_ai_gain[range] << (chan & ~1); + adcen |= 1 << chan; } }