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Diffstat (limited to 'src/devices/machine/i2cmem.cpp')
-rw-r--r--src/devices/machine/i2cmem.cpp85
1 files changed, 48 insertions, 37 deletions
diff --git a/src/devices/machine/i2cmem.cpp b/src/devices/machine/i2cmem.cpp
index 140e60dc145..94c08716f97 100644
--- a/src/devices/machine/i2cmem.cpp
+++ b/src/devices/machine/i2cmem.cpp
@@ -4,8 +4,7 @@
I2C Memory
-Generic ram/rom/eeprom/flash on an i2c bus. Supports specifying the slave address,
-the data size & the page size for writing.
+ram/rom/eeprom/flash on an i2c bus.
inputs:
e0,e1,e2 lower 3 bits of the slave address
@@ -16,9 +15,11 @@ inputs:
outputs:
sda serial data
-The memory address is only 8 bits, devices larger than this have multiple slave addresses.
-The top five address bits are set at manufacture time, two values are standard.
+The memory address is only 8 bits for devices up to 2048 bytes,
+devices from 512 to 2048 bytes occupy multiple slave addresses.
+The top five address bits are set at manufacture time,
+there are two standard values.
***************************************************************************/
#include "emu.h"
@@ -59,15 +60,16 @@ static inline void ATTR_PRINTF( 3, 4 ) verboselog( device_t *device, int n_level
//**************************************************************************
// device type definition
-DEFINE_DEVICE_TYPE(I2CMEM, i2cmem_device, "i2cmem", "I2C Memory")
-DEFINE_DEVICE_TYPE(I2C_X2404P, i2c_x2404p_device, "x2404p", "X2404P I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C01, i2c_24c01_device, "24c01", "24C01 I2C Memory")
+DEFINE_DEVICE_TYPE(I2C_PCD8572, i2c_pcd8572_device, "pcd8572", "PCD8572 I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C02, i2c_24c02_device, "24c02", "24C02 I2C Memory")
+DEFINE_DEVICE_TYPE(I2C_M24C02, i2c_m24c02_device, "m24c02", "M24C02 I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C04, i2c_24c04_device, "24c04", "24C04 I2C Memory")
+DEFINE_DEVICE_TYPE(I2C_X2404P, i2c_x2404p_device, "x2404p", "X2404P I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C08, i2c_24c08_device, "24c08", "24C08 I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C16, i2c_24c16_device, "24c16", "24C16 I2C Memory")
-DEFINE_DEVICE_TYPE(I2C_24C16A, i2c_24c16a_device, "24c16a", "24C16A I2C Memory")
DEFINE_DEVICE_TYPE(I2C_24C64, i2c_24c64_device, "24c64", "24C64 I2C Memory")
+DEFINE_DEVICE_TYPE(I2C_24C512, i2c_24c512_device, "24c512", "24C512 I2C Memory")
//**************************************************************************
// LIVE DEVICE
@@ -83,13 +85,15 @@ i2cmem_device::i2cmem_device(
const char *tag,
device_t *owner,
uint32_t clock,
- int page_size,
+ int read_page_size,
+ int write_page_size,
int data_size) :
device_t(mconfig, type, tag, owner, clock),
device_nvram_interface(mconfig, *this),
m_region(*this, DEVICE_SELF),
m_slave_address(I2CMEM_SLAVE_ADDRESS),
- m_page_size(page_size),
+ m_read_page_size(read_page_size),
+ m_write_page_size(write_page_size),
m_data_size(data_size),
m_scl(0),
m_sdaw(0),
@@ -110,48 +114,53 @@ i2cmem_device::i2cmem_device(
assert(!clock);
}
-i2cmem_device::i2cmem_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2CMEM, tag, owner, clock, 0, 0)
+i2c_24c01_device::i2c_24c01_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_24C01, tag, owner, clock, 0, 8, 0x80)
{
}
-i2c_x2404p_device::i2c_x2404p_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_X2404P, tag, owner, clock, 8, 0x200)
+i2c_pcd8572_device::i2c_pcd8572_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_PCD8572, tag, owner, clock, 0, 0, 0x80)
{
}
-i2c_24c01_device::i2c_24c01_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C01, tag, owner, clock, 4, 0x80)
+i2c_24c02_device::i2c_24c02_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_24C02, tag, owner, clock, 0, 8, 0x100)
{
}
-i2c_24c02_device::i2c_24c02_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C02, tag, owner, clock, 4, 0x100)
+i2c_m24c02_device::i2c_m24c02_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_M24C02, tag, owner, clock, 0, 16, 0x100)
{
}
i2c_24c04_device::i2c_24c04_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C04, tag, owner, clock, 8, 0x200)
+ i2cmem_device(mconfig, I2C_24C04, tag, owner, clock, 0, 16, 0x200)
+{
+}
+
+i2c_x2404p_device::i2c_x2404p_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_X2404P, tag, owner, clock, 0x100, 8, 0x200)
{
}
i2c_24c08_device::i2c_24c08_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C08, tag, owner, clock, 0, 0x400)
+ i2cmem_device(mconfig, I2C_24C08, tag, owner, clock, 0, 16, 0x400)
{
}
i2c_24c16_device::i2c_24c16_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C16, tag, owner, clock, 8, 0x800)
+ i2cmem_device(mconfig, I2C_24C16, tag, owner, clock, 0, 16, 0x800)
{
}
-i2c_24c16a_device::i2c_24c16a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C16A, tag, owner, clock, 0, 0x800)
+i2c_24c64_device::i2c_24c64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_24C64, tag, owner, clock, 0, 32, 0x2000)
{
}
-i2c_24c64_device::i2c_24c64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
- i2cmem_device(mconfig, I2C_24C64, tag, owner, clock, 8, 0x2000)
+i2c_24c512_device::i2c_24c512_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock) :
+ i2cmem_device(mconfig, I2C_24C512, tag, owner, clock, 0, 128, 0x10000)
{
}
@@ -162,7 +171,7 @@ i2c_24c64_device::i2c_24c64_device(const machine_config &mconfig, const char *ta
void i2cmem_device::device_start()
{
m_data = std::make_unique<uint8_t []>(m_data_size);
- m_page.resize( m_page_size );
+ m_page.resize( m_write_page_size );
save_item( NAME(m_scl) );
save_item( NAME(m_sdaw) );
@@ -181,7 +190,7 @@ void i2cmem_device::device_start()
save_item( NAME(m_page_offset) );
save_item( NAME(m_page_written_size) );
save_pointer( &m_data[0], "m_data", m_data_size );
- if ( m_page_size > 0 )
+ if ( m_write_page_size > 0 )
{
save_item( NAME(m_page) );
}
@@ -286,13 +295,15 @@ WRITE_LINE_MEMBER( i2cmem_device::write_sda )
{
if( m_sdaw )
{
- if( m_state == STATE_DATAIN && m_page_size > 0 )
+ if( m_page_written_size > 0 )
{
int base = data_offset();
- int root = base & ~( m_page_size - 1);
- for( int i=0; i < m_page_written_size; i++)
- m_data[root | ((base + i) & (m_page_size - 1))] = m_page[i];
- verboselog( this, 1, "data[ %04x to %04x ] = %x bytes\n", base, root | ((base + m_page_written_size - 1) & (m_page_size - 1)), m_page_written_size );
+ int root = base & ~( m_write_page_size - 1 );
+ for( int i = 0; i < m_page_written_size; i++ )
+ m_data[root | ((base + i) & (m_write_page_size - 1))] = m_page[i];
+ verboselog( this, 1, "data[ %04x to %04x ] = %x bytes\n", base, root | ((base + m_page_written_size - 1) & (m_write_page_size - 1)), m_page_written_size );
+
+ m_page_written_size = 0;
}
verboselog( this, 1, "stop\n" );
m_state = STATE_IDLE;
@@ -373,7 +384,7 @@ WRITE_LINE_MEMBER( i2cmem_device::write_scl )
break;
case STATE_ADDRESSLOW:
- m_byteaddr = m_shift | (skip_addresshigh() ? (m_devsel & DEVSEL_ADDRESS) << 7 : m_addresshigh << 8);
+ m_byteaddr = m_shift | (skip_addresshigh() ? ((m_devsel & DEVSEL_ADDRESS) << 7) & address_mask() : m_addresshigh << 8);
m_page_offset = 0;
m_page_written_size = 0;
@@ -388,17 +399,17 @@ WRITE_LINE_MEMBER( i2cmem_device::write_scl )
verboselog( this, 0, "write not enabled\n" );
m_state = STATE_IDLE;
}
- else if( m_page_size > 0 )
+ else if( m_write_page_size > 0 )
{
m_page[ m_page_offset ] = m_shift;
verboselog( this, 1, "page[ %04x ] <- %02x\n", m_page_offset, m_page[ m_page_offset ] );
m_page_offset++;
- if( m_page_offset == m_page_size )
+ if( m_page_offset == m_write_page_size )
m_page_offset = 0;
m_page_written_size++;
- if( m_page_written_size > m_page_size)
- m_page_written_size = m_page_size;
+ if( m_page_written_size > m_write_page_size)
+ m_page_written_size = m_write_page_size;
}
else
{
@@ -440,7 +451,7 @@ WRITE_LINE_MEMBER( i2cmem_device::write_scl )
m_shift = m_data[offset];
verboselog( this, 1, "data[ %04x ] -> %02x\n", offset, m_shift );
- m_byteaddr++;
+ m_byteaddr = (m_byteaddr & ~(m_read_page_size - 1)) | ((m_byteaddr + 1) & (m_read_page_size - 1));
}
m_sdar = ( m_shift >> 7 ) & 1;