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-spg2xx_io: Better ADC behavior when reading converted data. [Ryan Holtz]

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This commit is contained in:
Ryan Holtz 2020-06-11 20:38:45 +02:00
parent cdb5ca42c6
commit bd606bd055
1 changed files with 3 additions and 2 deletions
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5
src/devices/machine/spg2xx_io.cpp
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@ -456,7 +456,6 @@ READ16_MEMBER(spg2xx_io_device::io_r)
case REG_ADC_DATA: case REG_ADC_DATA:
{ {
m_io_regs[REG_ADC_DATA] = 0;
const uint16_t old = IO_IRQ_STATUS; const uint16_t old = IO_IRQ_STATUS;
IO_IRQ_STATUS &= ~0x2000; IO_IRQ_STATUS &= ~0x2000;
const uint16_t changed = (old & IO_IRQ_ENABLE) ^ (IO_IRQ_STATUS & IO_IRQ_ENABLE); const uint16_t changed = (old & IO_IRQ_ENABLE) ^ (IO_IRQ_STATUS & IO_IRQ_ENABLE);
@ -1116,11 +1115,13 @@ WRITE16_MEMBER(spg2xx_io_device::io_w)
m_io_regs[REG_ADC_CTRL] &= ~0x3000; m_io_regs[REG_ADC_CTRL] &= ~0x3000;
const uint32_t adc_clocks = 16 << ((m_io_regs[REG_ADC_CTRL] >> 2) & 3); const uint32_t adc_clocks = 16 << ((m_io_regs[REG_ADC_CTRL] >> 2) & 3);
m_adc_timer[channel]->adjust(attotime::from_ticks(adc_clocks, 27000000)); m_adc_timer[channel]->adjust(attotime::from_ticks(adc_clocks, 27000000));
m_io_regs[REG_ADC_DATA] &= ~0x8000;
} }
// Req_Auto_8K // Req_Auto_8K
if (BIT(data, 10)) if (BIT(data, 10))
{ {
m_io_regs[REG_ADC_DATA] &= ~0x8000;
m_adc_timer[channel]->adjust(attotime::from_hz(8000), 0, attotime::from_hz(8000)); m_adc_timer[channel]->adjust(attotime::from_hz(8000), 0, attotime::from_hz(8000));
} }
} }
@ -1752,7 +1753,7 @@ void spg2xx_io_device::do_gpio(uint32_t offset, bool write)
void spg2xx_io_device::do_adc_capture(int channel) void spg2xx_io_device::do_adc_capture(int channel)
{ {
m_io_regs[REG_ADC_DATA] = m_adc_in[channel]() & 0x0fff; m_io_regs[REG_ADC_DATA] = (m_adc_in[channel]() & 0x0fff) | 0x8000;
if (BIT(m_io_regs[REG_ADC_DATA], 11)) if (BIT(m_io_regs[REG_ADC_DATA], 11))
{ {
//m_io_regs[REG_ADC_DATA] |= 0xf000; //m_io_regs[REG_ADC_DATA] |= 0xf000;