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-rw-r--r--src/devices/machine/adc1213x.c338
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diff --git a/src/devices/machine/adc1213x.c b/src/devices/machine/adc1213x.c
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+++ b/src/devices/machine/adc1213x.c
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+// license:BSD-3-Clause
+// copyright-holders:smf
+/***************************************************************************
+
+ National Semiconductor ADC12130 / ADC12132 / ADC12138
+
+ Self-calibrating 12-bit Plus Sign Serial I/O A/D Converters with MUX
+ and Sample/Hold
+
+ TODO:
+ - Only ADC12138 currently supported
+
+ 2009-06 Converted to be a device
+
+***************************************************************************/
+
+#include "emu.h"
+#include "adc1213x.h"
+
+
+/***************************************************************************
+ TYPE DEFINITIONS
+***************************************************************************/
+
+#define ADC1213X_CONV_MODE_12_MSB_FIRST 0
+#define ADC1213X_CONV_MODE_16_MSB_FIRST 1
+#define ADC1213X_CONV_MODE_12_LSB_FIRST 2
+#define ADC1213X_CONV_MODE_16_LSB_FIRST 3
+
+#define ADC1213X_ACQUISITION_TIME_6_CCLK 0
+#define ADC1213X_ACQUISITION_TIME_10_CCLK 1
+#define ADC1213X_ACQUISITION_TIME_18_CCLK 2
+#define ADC1213X_ACQUISITION_TIME_34_CCLK 3
+
+
+
+const device_type ADC12130 = &device_creator<adc12130_device>;
+
+adc12130_device::adc12130_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : adc12138_device(mconfig, ADC12130, "ADC12130", tag, owner, clock, "adc12130", __FILE__)
+{
+}
+
+
+const device_type ADC12132 = &device_creator<adc12132_device>;
+
+adc12132_device::adc12132_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : adc12138_device(mconfig, ADC12132, "ADC12132", tag, owner, clock, "adc12132", __FILE__)
+{
+}
+
+
+const device_type ADC12138 = &device_creator<adc12138_device>;
+
+adc12138_device::adc12138_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, ADC12138, "ADC12138", tag, owner, clock, "adc12138", __FILE__)
+{
+}
+adc12138_device::adc12138_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
+ : device_t(mconfig, type, name, tag, owner, clock, shortname, source)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void adc12138_device::device_start()
+{
+ m_cycle = 0;
+ m_data_out = 0;
+ m_data_in = 0;
+ m_auto_cal = 0;
+ m_auto_zero = 0;
+ m_input_shift_reg = 0;
+ m_output_shift_reg = 0;
+ m_end_conv = 0;
+
+ /* resolve callbacks */
+ m_ipt_read_cb.bind_relative_to(*owner());
+
+ /* register for state saving */
+ save_item(NAME(m_cycle));
+ save_item(NAME(m_data_out));
+ save_item(NAME(m_data_in));
+ save_item(NAME(m_conv_mode));
+ save_item(NAME(m_auto_cal));
+ save_item(NAME(m_auto_zero));
+ save_item(NAME(m_acq_time));
+ save_item(NAME(m_data_out_sign));
+ save_item(NAME(m_input_shift_reg));
+ save_item(NAME(m_output_shift_reg));
+ save_item(NAME(m_end_conv));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void adc12138_device::device_reset()
+{
+ m_conv_mode = ADC1213X_CONV_MODE_12_MSB_FIRST;
+ m_data_out_sign = 1;
+ m_auto_cal = 0;
+ m_auto_zero = 0;
+ m_acq_time = ADC1213X_ACQUISITION_TIME_10_CCLK;
+}
+
+/***************************************************************************
+ IMPLEMENTATION
+***************************************************************************/
+
+/*-------------------------------------------------
+ di_w
+-------------------------------------------------*/
+
+WRITE8_MEMBER( adc12138_device::di_w )
+{
+ m_data_in = data & 1;
+}
+
+/*-------------------------------------------------
+ convert
+-------------------------------------------------*/
+
+void adc12138_device::convert(int channel, int bits16, int lsbfirst)
+{
+ int bits;
+ int input_value;
+ double input = 0;
+
+ if (bits16)
+ fatalerror("ADC1213X: 16-bit mode not supported\n");
+
+ if (lsbfirst)
+ fatalerror("ADC1213X: LSB first not supported\n");
+
+ switch (channel)
+ {
+ case 0x8: // H L L L - CH0 (single-ended)
+ {
+ input = m_ipt_read_cb(0);
+ break;
+ }
+ case 0xc: // H H L L - CH1 (single-ended)
+ {
+ input = m_ipt_read_cb(1);
+ break;
+ }
+ case 0x9: // H L L H - CH2 (single-ended)
+ {
+ input = m_ipt_read_cb(2);
+ break;
+ }
+ case 0xd: // H H L H - CH3 (single-ended)
+ {
+ input = m_ipt_read_cb(3);
+ break;
+ }
+ case 0xa: // H L H L - CH4 (single-ended)
+ {
+ input = m_ipt_read_cb(4);
+ break;
+ }
+ case 0xe: // H H H L - CH5 (single-ended)
+ {
+ input = m_ipt_read_cb(5);
+ break;
+ }
+ case 0xb: // H L H H - CH6 (single-ended)
+ {
+ input = m_ipt_read_cb(6);
+ break;
+ }
+ case 0xf: // H H H H - CH7 (single-ended)
+ {
+ input = m_ipt_read_cb(7);
+ break;
+ }
+ default:
+ {
+ fatalerror("ADC1213X: unsupported channel %02X\n", channel);
+ }
+ }
+
+ input_value = (int)(input * 2047.0);
+
+ bits = 12;
+
+ // sign-extend if needed
+ if (m_data_out_sign)
+ {
+ input_value = input_value | ((input_value & 0x800) << 1);
+ bits++;
+ }
+
+ m_output_shift_reg = 0;
+
+ for (int i = 0; i < bits; i++)
+ {
+ if (input_value & (1 << ((bits - 1) - i)))
+ {
+ m_output_shift_reg |= (1 << i);
+ }
+ }
+
+ m_data_out = m_output_shift_reg & 1;
+ m_output_shift_reg >>= 1;
+}
+
+/*-------------------------------------------------
+ cs_w
+-------------------------------------------------*/
+
+WRITE8_MEMBER( adc12138_device::cs_w )
+{
+ if (data)
+ {
+ //printf("ADC: CS\n");
+
+ if (m_cycle >= 7)
+ {
+ int mode = m_input_shift_reg >> (m_cycle - 8);
+
+ switch (mode & 0xf)
+ {
+ case 0x0: // X X X X L L L L - 12 or 13 Bit MSB First conversion
+ {
+ convert((mode >> 4) & 0xf, 0, 0);
+ break;
+ }
+ case 0x1: // X X X X L L L H - 16 or 17 Bit MSB First conversion
+ {
+ convert((mode >> 4) & 0xf, 1, 0);
+ break;
+ }
+ case 0x4: // X X X X L H L L - 12 or 13 Bit LSB First conversion
+ {
+ convert((mode >> 4) & 0xf, 0, 1);
+ break;
+ }
+ case 0x5: // X X X X L H L H - 16 or 17 Bit LSB First conversion
+ {
+ convert((mode >> 4) & 0xf, 1, 1);
+ break;
+ }
+
+ default:
+ {
+ switch (mode)
+ {
+ case 0x08: // L L L L H L L L - Auto cal
+ {
+ m_auto_cal = 1;
+ break;
+ }
+
+ case 0x0e: // L L L L H H H L - Acquisition time 6 CCLK cycles
+ {
+ m_acq_time = ADC1213X_ACQUISITION_TIME_6_CCLK;
+ break;
+ }
+
+ case 0x8d: // H L L L H H L H - Data out with sign
+ {
+ m_data_out_sign = 1;
+ break;
+ }
+
+ case 0x0f: // L L L L H H H H - User mode
+ {
+ break;
+ }
+
+ default:
+ {
+ fatalerror("ADC1213X: unknown config mode %02X\n", mode);
+ }
+ }
+ break;
+ }
+ }
+ }
+
+ m_cycle = 0;
+ m_input_shift_reg = 0;
+
+ m_end_conv = 0;
+ }
+}
+
+/*-------------------------------------------------
+ sclk_w
+-------------------------------------------------*/
+
+WRITE8_MEMBER( adc12138_device::sclk_w )
+{
+ if (data)
+ {
+ //printf("ADC: cycle %d, DI = %d\n", adc1213x->cycle, adc1213x->data_in);
+
+ m_input_shift_reg <<= 1;
+ m_input_shift_reg |= m_data_in;
+
+ m_data_out = m_output_shift_reg & 1;
+ m_output_shift_reg >>= 1;
+
+ m_cycle++;
+ }
+}
+
+/*-------------------------------------------------
+ conv_w
+-------------------------------------------------*/
+
+WRITE8_MEMBER( adc12138_device::conv_w )
+{
+ m_end_conv = 1;
+}
+
+/*-------------------------------------------------
+ do_r
+-------------------------------------------------*/
+
+READ8_MEMBER( adc12138_device::do_r )
+{
+ //printf("ADC: DO\n");
+ return m_data_out;
+}
+
+/*-------------------------------------------------
+ eoc_r
+-------------------------------------------------*/
+
+READ8_MEMBER( adc12138_device::eoc_r )
+{
+ return m_end_conv;
+}