/*!
Send positive acknowledge afterwards if <acknowledge> is true,
else send negative one
*/
static status_t
receive_byte(const i2c_bus *bus, uint8 *resultByte, bool acknowledge)
{
uint8 byte = 0;
int i;
// pull clock low to let slave wait for us
bus->set_signals(bus->cookie, 0, 1);
for (i = 7; i >= 0; i--) {
bool bit;
status_t status = receive_bit(bus, &bit,
i == 7 ? bus->timing.byte_timeout : bus->timing.bit_timeout);
if (status != B_OK)
return status;
byte = (byte << 1) | bit;
}
//SHOW_FLOW(3, "%x ", byte);
*resultByte = byte;
return send_bit(bus, acknowledge ? 0 : 1, bus->timing.bit_timeout);
}
inline void im6402_device::receive()
{
int bit = 1;
if (m_in_rri_func.isnull())
{
bit = get_in_data_bit();
}
else
{
bit = m_in_rri_func();
}
receive_bit(bit);
}
irom static i2c_error_t receive_ack(bool_t *ack)
{
i2c_error_t error;
bool_t bit;
if((state != i2c_state_address_ack_receive) && (state != i2c_state_data_send_ack_receive))
return(i2c_error_invalid_state_not_receive_ack);
if((error = receive_bit(&bit)) != i2c_error_ok)
return(error);
*ack = !bit;
return(i2c_error_ok);
}
irom static i2c_error_t receive_byte(uint8_t *byte)
{
int current;
bool_t bit;
i2c_error_t error;
for(*byte = 0, current = 8; current > 0; current--)
{
*byte <<= 1;
if((error = receive_bit(&bit)) != i2c_error_ok)
return(error);
if(bit)
*byte |= 0x01;
}
return(i2c_error_ok);
}
void im6402_device::input_callback(UINT8 state)
{
int bit = (state & SERIAL_STATE_RX_DATA) ? 1 : 0;
receive_bit(bit);
}
