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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/******************************************************************************
Psion ASIC3/PS34
MC and HC power supplies are based on a full custom liner ASIC known as ASIC3.
This custom chip is manufactured by Maxim and has the Maxim part number MAX616.
TODO:
- Battery status readings, maybe different analogue channel.
******************************************************************************/
#include "emu.h"
#include "psion_asic3.h"
#define VERBOSE 0
//#define LOG_OUTPUT_FUNC osd_printf_info
#include "logmacro.h"
DEFINE_DEVICE_TYPE(PSION_PSU_ASIC3, psion_psu_asic3_device, "psion_psu_asic3", "Psion PSU (ASIC3)")
DEFINE_DEVICE_TYPE(PSION_PSU_ASIC5, psion_psu_asic5_device, "psion_psu_asic5", "Psion PSU (ASIC5)")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
psion_asic3_device::psion_asic3_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, m_adin_cb(*this, 0)
{
}
psion_psu_asic5_device::psion_psu_asic5_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: psion_asic3_device(mconfig, PSION_PSU_ASIC5, tag, owner, clock)
{
}
psion_psu_asic3_device::psion_psu_asic3_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: psion_asic3_device(mconfig, PSION_PSU_ASIC3, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void psion_asic3_device::device_start()
{
save_item(NAME(m_a3_control1));
save_item(NAME(m_a3_control2));
save_item(NAME(m_a3_control3));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void psion_asic3_device::device_reset()
{
m_a3_control1 = 0x00;
m_a3_control2 = 0x00;
m_a3_control3 = 0x00;
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
void psion_psu_asic5_device::data_w(uint16_t data)
{
switch (data & 0x300)
{
case NULL_FRAME:
device_reset();
break;
case CONTROL_FRAME:
m_sibo_control = data & 0xff;
break;
case DATA_FRAME:
data &= 0xff;
switch (m_sibo_control & 0x0f)
{
case 0x01: // A3Control1
// b0-b4 DtoaBits
// b5 Vcc3Enable LCD
// b6 Vcc4Enable Sound subsystem
// b7 Vcc5Enable SSDs
LOG("%s data_w: A3Control1 register %02x\n", machine().describe_context(), data);
m_a3_control1 = data;
break;
case 0x02: // A3Setup
LOG("%s data_w: A3Setup register %02x\n", machine().describe_context(), data);
break;
case 0x03: // A3Control2
// b0 Vee1Enable LCD
// b1 Vee2Enable Sound subsystem
// b2 VhEnable
// b3 Vee1SoftStart
// b4 Vee2SoftStart
// b5 VhSoftStart
// b6-b7 AnalogueMultiplex
LOG("%s data_w: A3Control2 register %02x\n", machine().describe_context(), data);
m_a3_control2 = data;
break;
case 0x07: // A3Control3
// b0 0
// b1 OffEnable
// b2 AdcReadHighEnable
// b3-b7 0
LOG("%s data_w: A3Control3 register %02x\n", machine().describe_context(), data);
m_a3_control3 = data;
break;
default:
LOG("%s data_w: unknown control %02x data %02x\n", machine().describe_context(), m_sibo_control, data);
break;
}
}
}
uint8_t psion_psu_asic5_device::data_r()
{
uint8_t data = 0x00;
switch (m_sibo_control & 0xc0)
{
case 0x40: // SerialSelect
if (m_sibo_control == 0x43) // A3SelectId
data = 0x80; // A3InfoByte
break;
case 0xc0: // SerialRead
switch (m_sibo_control & 0x0f)
{
case 0x00: // A3Adc
{
// A3AdcLsbR
// b0-b6 OtherBits
// b7 InvertedBit
// A3AdcMsbR
// b0-b3 AdcBits
// b4 Overrange
// b5 Polarity
uint16_t data_in = 0;
switch (BIT(m_a3_control2, 6, 2)) // AnalogueMultiplex
{
case 0: // AdcDigitizer
data_in = m_adin_cb();
break;
case 1: // AdcVh
break;
case 2: // AdcMainBattery
data_in = 0x7ff;
break;
case 3: // AdcLithiumBattery
data_in = 0x7ff;
break;
}
if (BIT(m_a3_control3, 2)) // AdcReadHighEnable
data = BIT(data_in, 8, 4);
else
data = (data_in & 0xff) ^ 0x80;
LOG("%s data_r: A3Adc %d register %02x\n", machine().describe_context(), BIT(m_a3_control2, 6, 2), data);
break;
}
case 0x0d: // A3Status
// b0 ColdStart
// b1 PowerFail
data = 0x02; // PowerFail (required to initialise MC400/200/Word)
LOG("%s data_r: A3Status register %02x\n", machine().describe_context(), data);
break;
default:
LOG("%s data_r: unknown control %02x data %02x\n", machine().describe_context(), m_sibo_control, data);
break;
}
break;
}
return data;
}
void psion_psu_asic3_device::data_w(uint16_t data)
{
switch (data & 0x300)
{
case NULL_FRAME:
device_reset();
break;
case CONTROL_FRAME:
m_sibo_control = data & 0xff;
break;
case DATA_FRAME:
data &= 0xff;
switch (m_sibo_control & 0x0f)
{
case 0x00: // PS34W_CONTROL
// b0-b1 Vhpower
// b2 Vh
// b3 Vcc5
// b4 Vee2
// b5 Vcc4
// b6 Vee1
// b7 Vcc3
LOG("%s data_w: PS34W_CONTROL %02x\n", machine().describe_context(), data);
m_a3_control1 = data;
break;
case 0x01: // PS34W_DTOA
// b0-b4 Dac
// b5-b6 Adcsel
// b7 Ncc
LOG("%s data_w: PS34W_DTOA %02x\n", machine().describe_context(), data);
m_a3_control2 = data;
break;
default:
LOG("%s data_w: unknown control %02x data %02x\n", machine().describe_context(), m_sibo_control, data);
break;
}
}
}
uint8_t psion_psu_asic3_device::data_r()
{
uint8_t data = 0x00;
switch (m_sibo_control & 0xc0)
{
case 0x40: // SerialSelect
if (m_sibo_control == 0x43) // A3SelectId
data = 0x80; // A3InfoByte
break;
case 0xc0: // SerialRead
switch (m_sibo_control & 0x0f)
{
case 0x00: // PS34R_ADC
switch (BIT(m_a3_control2, 5, 2)) // Adcsel
{
case 0: // ADCSEL_ADCIN
data = m_adin_cb() & 0xff;
break;
case 1: // ADCSEL_VIN
data = 0xff;
break;
case 2: // ADCSEL_VH
break;
case 3: // ADCSEL_VBATT
data = 0xff;
break;
}
LOG("%s data_r: PS34R_ADC %d %02x\n", machine().describe_context(), BIT(m_a3_control2, 5, 2), data);
break;
case 0x01: // PS34R_STATUS
// b0-b2 Admsb
// b3 Nc
// b4 Penup
// b5 Vhready
// b6 ColdStart
// b7 PowerFail
switch (BIT(m_a3_control2, 5, 2)) // Adcsel
{
case 0: // ADCSEL_ADCIN
data = BIT(m_adin_cb(), 8, 3);
break;
case 1: // ADCSEL_VIN
data = 0x07;
break;
case 2: // ADCSEL_VH
break;
case 3: // ADCSEL_VBATT
data = 0x07;
break;
}
data |= 0x40; // PowerFail (required to initialise MC600)
LOG("%s data_r: PS34R_STATUS %02x\n", machine().describe_context(), data);
break;
default:
LOG("%s data_r: unknown control %02x data %02x\n", machine().describe_context(), m_sibo_control, data);
break;
}
break;
}
return data;
}
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