void SMI::read(byte HB, byte LB, byte target[]) {
start();
//OP code
opRead();
putAddress(HB, LB); //send register address
readTurnA();
getData(target, 2);
}
/**
* Set bits in EEPROM 4-wire interface.
*
* @param u32Wires Values of DI, CS, SK.
* @remarks The value of DO bit in 'u32Wires' is ignored.
*/
void EEPROM93C46::write(uint32_t u32Wires)
{
if (u32Wires & WIRES_CS) {
if (!(m_u32InternalWires & WIRES_SK) && (u32Wires & WIRES_SK)) {
/* Positive edge of clock */
if (m_eState == STANDBY) {
if (u32Wires & WIRES_DI) {
m_eState = READING_DI;
m_eOp = OP_DECODE;
m_u16Mask = OPADDR_MSB;
m_u16Word = 0;
}
}
else {
if (m_eState == READING_DI) {
if (u32Wires & WIRES_DI) {
m_u16Word |= m_u16Mask;
}
}
else if (m_eState == WRITING_DO) {
m_u32InternalWires &= ~WIRES_DO;
if (m_u16Word & m_u16Mask) {
m_u32InternalWires |= WIRES_DO;
}
}
else return;
/* Next bit */
m_u16Mask >>= 1;
if (m_u16Mask == 0)
{
switch (this->m_eOp)
{
case OP_READ:
m_eState = opRead();
break;
case OP_WRITE:
m_eState = opWrite();
break;
case OP_WRITE_ALL:
m_eState = opWriteAll();
break;
case OP_DECODE:
m_eState = opDecode();
break;
default:
;
}
}
}
}
else if (m_eState == WAITING_CS_RISE) {
m_u32InternalWires |= WIRES_DO; /* ready */
m_eState = STANDBY;
}
}
/**
* Decode opcode and address from 'opAddr' member.
*
* Decodes operation and executes it immediately if possible; otherwise, stores
* the decoded operation and address.
*
* @returns New state
*/
EEPROM93C46::State EEPROM93C46::opDecode()
{
switch (m_u16Word>>6) {
case 3: /* ERASE */
storeWord(m_u16Word & ADDR_MASK, 0xFFFF);
return WAITING_CS_FALL;
case 2: /* READ */
m_eOp = OP_READ;
m_u16Addr = m_u16Word & ADDR_MASK;
return opRead(); /* Load first word */
case 1: /* WRITE */
m_eOp = OP_WRITE;
m_u16Addr = m_u16Word & ADDR_MASK;
m_u16Word = 0;
m_u16Mask = DATA_MSB;
return READING_DI;
case 0:
switch (m_u16Word>>4) {
case 0: /* ERASE/WRITE DISABLE */
m_fWriteEnabled = false;
return STANDBY;
case 1: /* WRITE ALL */
m_eOp = OP_WRITE_ALL;
m_u16Word = 0;
m_u16Mask = DATA_MSB;
return READING_DI;
case 2: /* ERASE ALL */
/* Re-use opWriteAll */
m_u16Word = 0xFFFF;
return opWriteAll();
case 3: /* ERASE/WRITE ENABLE */
m_fWriteEnabled = true;
return STANDBY;
}
}
return m_eState;
}
