static inline void i2c_automaton(uint32_t state)
{
switch (state) {
case I2C_START:
case I2C_RESTART:
I2cSendByte(i2c_slave_addr);
I2cClearStart();
i2c_index = 0;
break;
case I2C_MR_DATA_ACK:
if (i2c_index < i2c_len) {
i2c_buf[i2c_index] = I2C_DATA_REG;
i2c_index++;
I2cReceive(i2c_index < i2c_len - 1);
}
else {
/* error , we should have got NACK */
I2cSendStop();
}
break;
case I2C_MR_SLA_ACK: /* At least one char */
/* Wait and reply with ACK or NACK */
I2cReceive(i2c_index < i2c_len - 1);
break;
case I2C_MR_SLA_NACK:
case I2C_MT_SLA_NACK:
I2cSendStart();
break;
case I2C_MT_SLA_ACK:
case I2C_MT_DATA_ACK:
if (i2c_index < i2c_len) {
I2cSendByte(i2c_buf[i2c_index]);
i2c_index++;
}
else {
I2cSendStop();
}
break;
case I2C_MR_DATA_NACK:
if (i2c_index < i2c_len) {
i2c_buf[i2c_index] = I2C_DATA_REG;
}
I2cSendStop();
break;
default:
I2cSendStop();
/* LED_ON(2); FIXME log error */
}
}
__attribute__ ((always_inline)) static inline void I2cAutomaton(int32_t state, struct i2c_periph* p) {
struct i2c_transaction* trans = p->trans[p->trans_extract_idx];
switch (state) {
case I2C_START:
case I2C_RESTART:
// Set R/W flag
switch (trans->type) {
case I2CTransRx :
SetBit(trans->slave_addr,0);
break;
case I2CTransTx:
case I2CTransTxRx:
ClearBit(trans->slave_addr,0);
break;
default:
break;
}
I2cSendByte(p->reg_addr,trans->slave_addr);
I2cClearStart(p->reg_addr);
p->idx_buf = 0;
break;
case I2C_MR_DATA_ACK:
if (p->idx_buf < trans->len_r) {
trans->buf[p->idx_buf] = ((i2cRegs_t *)(p->reg_addr))->dat;
p->idx_buf++;
I2cReceive(p->reg_addr,p->idx_buf < trans->len_r - 1);
}
else {
/* error , we should have got NACK */
I2cFail(p,trans);
}
break;
case I2C_MR_DATA_NACK:
if (p->idx_buf < trans->len_r) {
trans->buf[p->idx_buf] = ((i2cRegs_t *)(p->reg_addr))->dat;
}
I2cSendStop(p,trans);
break;
case I2C_MR_SLA_ACK: /* At least one char */
/* Wait and reply with ACK or NACK */
I2cReceive(p->reg_addr,p->idx_buf < trans->len_r - 1);
break;
case I2C_MR_SLA_NACK:
case I2C_MT_SLA_NACK:
/* Slave is not responding, transaction is failed */
I2cFail(p,trans);
break;
case I2C_MT_SLA_ACK:
case I2C_MT_DATA_ACK:
if (p->idx_buf < trans->len_w) {
I2cSendByte(p->reg_addr,trans->buf[p->idx_buf]);
p->idx_buf++;
} else {
if (trans->type == I2CTransTxRx) {
trans->type = I2CTransRx; /* FIXME should not change type */
p->idx_buf = 0;
trans->slave_addr |= 1;
I2cSendStart(p);
} else {
I2cSendStop(p,trans);
}
}
break;
default:
I2cFail(p,trans);
/* FIXME log error */
break;
}
}