412 lines
16 KiB
C++
412 lines
16 KiB
C++
class X24C01
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{
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public:
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X24C01() {
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now_state = X24C01_IDLE;
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next_state = X24C01_IDLE;
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addr = 0;
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data = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = NULL;
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}
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void Reset( LPBYTE ptr ) {
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now_state = X24C01_IDLE;
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next_state = X24C01_IDLE;
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addr = 0;
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data = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = ptr;
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}
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void Write( BYTE scl_in, BYTE sda_in ) {
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// Clock line
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BYTE scl_rise = ~scl_old & scl_in;
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BYTE scl_fall = scl_old & ~scl_in;
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// Data line
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BYTE sda_rise = ~sda_old & sda_in;
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BYTE sda_fall = sda_old & ~sda_in;
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BYTE scl_old_temp = scl_old;
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BYTE sda_old_temp = sda_old;
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scl_old = scl_in;
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sda_old = sda_in;
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// Start condition?
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if( scl_old_temp && sda_fall ) {
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now_state = X24C01_ADDRESS;
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bitcnt = 0;
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addr = 0;
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sda = 0xFF;
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return;
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}
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// Stop condition?
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if( scl_old_temp && sda_rise ) {
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now_state = X24C01_IDLE;
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sda = 0xFF;
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return;
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}
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// SCL ____---- RISE
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if( scl_rise ) {
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switch( now_state ) {
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case X24C01_ADDRESS:
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if( bitcnt < 7 ) {
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// 本来はMSB->LSB
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addr &= ~(1<<bitcnt);
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addr |= (sda_in?1:0)<<bitcnt;
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} else {
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if( sda_in ) {
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next_state = X24C01_READ;
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data = pEEPDATA[addr&0x7F];
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} else {
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next_state = X24C01_WRITE;
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}
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}
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bitcnt++;
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break;
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case X24C01_ACK:
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sda = 0; // ACK
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break;
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case X24C01_READ:
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if( bitcnt < 8 ) {
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// 本来はMSB->LSB
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sda = (data&(1<<bitcnt))?1:0;
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}
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bitcnt++;
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break;
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case X24C01_WRITE:
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if( bitcnt < 8 ) {
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// 本来はMSB->LSB
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data &= ~(1<<bitcnt);
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data |= (sda_in?1:0)<<bitcnt;
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}
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bitcnt++;
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break;
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case X24C01_ACK_WAIT:
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if( !sda_in ) {
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next_state = X24C01_IDLE;
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}
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break;
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}
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}
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// SCL ----____ FALL
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if( scl_fall ) {
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switch( now_state ) {
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case X24C01_ADDRESS:
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if( bitcnt >= 8 ) {
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now_state = X24C01_ACK;
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sda = 0xFF;
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}
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break;
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case X24C01_ACK:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C01_READ:
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if( bitcnt >= 8 ) {
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now_state = X24C01_ACK_WAIT;
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addr = (addr+1)&0x7F;
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}
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break;
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case X24C01_WRITE:
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if( bitcnt >= 8 ) {
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now_state = X24C01_ACK;
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next_state = X24C01_IDLE;
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pEEPDATA[addr&0x7F] = data;
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addr = (addr+1)&0x7F;
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}
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break;
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}
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}
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}
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BYTE Read() {
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return sda;
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}
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// For State save
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void Load( LPBYTE p )
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{
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now_state = *((INT*)&p[0]);
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next_state = *((INT*)&p[4]);
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bitcnt = *((INT*)&p[8]);
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addr = p[12];
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data = p[13];
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sda = p[14];
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scl_old = p[15];
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sda_old = p[16];
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}
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void Save( LPBYTE p )
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{
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*((INT*)&p[0]) = now_state;
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*((INT*)&p[4]) = next_state;
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*((INT*)&p[8]) = bitcnt;
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p[12] = addr;
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p[13] = data;
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p[14] = sda;
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p[15] = scl_old;
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p[16] = sda_old;
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}
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protected:
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enum {
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X24C01_IDLE = 0, // Idle
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X24C01_ADDRESS, // Address set
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X24C01_READ, // Read
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X24C01_WRITE, // Write
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X24C01_ACK, // Acknowledge
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X24C01_ACK_WAIT, // Acknowledge wait
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};
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INT now_state, next_state;
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INT bitcnt;
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BYTE addr, data;
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BYTE sda;
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BYTE scl_old, sda_old;
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LPBYTE pEEPDATA;
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private:
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};
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class X24C02
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{
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public:
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X24C02() {
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now_state = X24C02_IDLE;
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next_state = X24C02_IDLE;
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addr = 0;
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data = 0;
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rw = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = NULL;
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}
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void Reset( LPBYTE ptr ) {
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now_state = X24C02_IDLE;
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next_state = X24C02_IDLE;
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addr = 0;
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data = 0;
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rw = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = ptr;
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}
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void Write( BYTE scl_in, BYTE sda_in ) {
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// Clock line
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BYTE scl_rise = ~scl_old & scl_in;
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BYTE scl_fall = scl_old & ~scl_in;
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// Data line
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BYTE sda_rise = ~sda_old & sda_in;
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BYTE sda_fall = sda_old & ~sda_in;
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BYTE scl_old_temp = scl_old;
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BYTE sda_old_temp = sda_old;
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scl_old = scl_in;
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sda_old = sda_in;
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// Start condition?
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if( scl_old_temp && sda_fall ) {
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now_state = X24C02_DEVADDR;
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bitcnt = 0;
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sda = 0xFF;
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return;
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}
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// Stop condition?
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if( scl_old_temp && sda_rise ) {
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now_state = X24C02_IDLE;
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sda = 0xFF;
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return;
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}
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// SCL ____---- RISE
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if( scl_rise ) {
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switch( now_state ) {
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case X24C02_DEVADDR:
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if( bitcnt < 8 ) {
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data &= ~(1<<(7-bitcnt));
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data |= (sda_in?1:0)<<(7-bitcnt);
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}
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bitcnt++;
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break;
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case X24C02_ADDRESS:
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if( bitcnt < 8 ) {
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addr &= ~(1<<(7-bitcnt));
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addr |= (sda_in?1:0)<<(7-bitcnt);
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}
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bitcnt++;
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break;
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case X24C02_READ:
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if( bitcnt < 8 ) {
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sda = (data&(1<<(7-bitcnt)))?1:0;
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}
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bitcnt++;
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break;
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case X24C02_WRITE:
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if( bitcnt < 8 ) {
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data &= ~(1<<(7-bitcnt));
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data |= (sda_in?1:0)<<(7-bitcnt);
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}
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bitcnt++;
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break;
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case X24C02_NAK:
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sda = 0xFF; // NAK
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break;
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case X24C02_ACK:
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sda = 0; // ACK
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break;
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case X24C02_ACK_WAIT:
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if( !sda_in ) {
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next_state = X24C02_READ;
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data = pEEPDATA[addr];
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}
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break;
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}
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}
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// SCL ----____ FALL
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if( scl_fall ) {
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switch( now_state ) {
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case X24C02_DEVADDR:
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if( bitcnt >= 8 ) {
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if( (data & 0xA0) == 0xA0 ) {
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now_state = X24C02_ACK;
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rw = data & 0x01;
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sda = 0xFF;
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if( rw ) {
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// Now address read
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next_state = X24C02_READ;
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data = pEEPDATA[addr];
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} else {
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next_state = X24C02_ADDRESS;
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}
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bitcnt = 0;
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} else {
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now_state = X24C02_NAK;
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next_state = X24C02_IDLE;
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sda = 0xFF;
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}
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}
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break;
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case X24C02_ADDRESS:
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if( bitcnt >= 8 ) {
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now_state = X24C02_ACK;
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sda = 0xFF;
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if( rw ) {
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// Readでは絶対来ないが念の為
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next_state = X24C02_IDLE;
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} else {
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// to Data Write
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next_state = X24C02_WRITE;
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}
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bitcnt = 0;
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}
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break;
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case X24C02_READ:
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if( bitcnt >= 8 ) {
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now_state = X24C02_ACK_WAIT;
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addr = (addr+1)&0xFF;
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}
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break;
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case X24C02_WRITE:
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if( bitcnt >= 8 ) {
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pEEPDATA[addr] = data;
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now_state = X24C02_ACK;
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next_state = X24C02_WRITE;
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addr = (addr+1)&0xFF;
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bitcnt = 0;
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}
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break;
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case X24C02_NAK:
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now_state = X24C02_IDLE;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C02_ACK:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C02_ACK_WAIT:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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}
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}
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}
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BYTE Read() {
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return sda;
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}
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// For State save
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void Load( LPBYTE p )
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{
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now_state = *((INT*)&p[0]);
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next_state = *((INT*)&p[4]);
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bitcnt = *((INT*)&p[8]);
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addr = p[12];
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data = p[13];
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rw = p[14];
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sda = p[15];
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scl_old = p[16];
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sda_old = p[17];
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}
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void Save( LPBYTE p )
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{
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*((INT*)&p[0]) = now_state;
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*((INT*)&p[4]) = next_state;
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*((INT*)&p[8]) = bitcnt;
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p[12] = addr;
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p[13] = data;
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p[14] = rw;
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p[15] = sda;
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p[16] = scl_old;
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p[17] = sda_old;
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}
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protected:
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enum {
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X24C02_IDLE = 0, // Idle
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X24C02_DEVADDR, // Device address set
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X24C02_ADDRESS, // Address set
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X24C02_READ, // Read
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X24C02_WRITE, // Write
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X24C02_ACK, // Acknowledge
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X24C02_NAK, // Not Acknowledge
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X24C02_ACK_WAIT, // Acknowledge wait
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};
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INT now_state, next_state;
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INT bitcnt;
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BYTE addr, data, rw;
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BYTE sda;
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BYTE scl_old, sda_old;
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LPBYTE pEEPDATA;
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private:
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};
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