Issuing SmartPort Commands

Once the SmartPort dispatcher is found, commands can be issued. The FujiNet can respond to STATUS, CONTROL, READ, WRITE, OPEN, and CLOSE commands.

STATUS

C implementation (CC65)

int8_t sp_status(uint8_t dest, uint8_t statcode)
{
  sp_error = 0;
  // build the command list
  sp_cmdlist[0] = SP_STATUS_PARAM_COUNT;
  sp_cmdlist[1] = dest; // set before calling sp_status();
  sp_cmdlist[2] = (uint8_t)((uint16_t)&sp_payload & 0x00FF);
  sp_cmdlist[3] = (uint8_t)((uint16_t)&sp_payload >> 8) & 0xFF;
  sp_cmdlist[4] = statcode;

  sp_cmdlist_low = (uint8_t)((uint16_t)&sp_cmdlist & 0x00FF);
  sp_cmdlist_high = (uint8_t)((uint16_t)&sp_cmdlist >> 8) & 0xFF;


  // store cmd list
  __asm__ volatile ("lda #%b", SP_CMD_STATUS);
  __asm__ volatile ("sta %g", spCmd); // store status command # 
  __asm__ volatile ("lda %v", sp_cmdlist_low);
  __asm__ volatile ("sta %g", spCmdListLow); // store status command #
  __asm__ volatile ("lda %v", sp_cmdlist_high);
  __asm__ volatile ("sta %g", spCmdListHigh); // store status command #

  __asm__ volatile ("jsr $C50D"); // to do - find SP entry point using algorithm from firmware reference
spCmd:
  __asm__ volatile ("nop");
spCmdListLow:
  __asm__ volatile ("nop");
spCmdListHigh:
  __asm__ volatile ("nop");
  __asm__ volatile ("stx %v", sp_rtn_low);
  __asm__ volatile ("sty %v", sp_rtn_high);
  __asm__ volatile ("sta %v", sp_err);

  sp_count = ((uint16_t)sp_rtn_high << 8) | (uint16_t)sp_rtn_low;
  sp_error = sp_err;
  return sp_err;
}
```c

### Asm implementation

```asm
	jsr DISPATCH
	DFB #STATUSCODE
	DW  CMLIST
	BCS ERROR

	; Everything ok
	CLC
	RTS
	
ERROR	; not okay
	RTS
	
CMLIST: DFB	#$04		; status has length of 4	
	DFB	#DEST           ; Destination device #
	DW	BUFFER          ; lo and hi bytes for buffer address
	DFB	STATUSCODE      ; The status code

CONTROL

READ

WRITE