rs_usb.c

Example codes for ADuC842 CPU family

#include "rs_usb.h"

void DelayUs(unsigned char count) {
	#pragma asm
		MOV A,R7
Jump_DelayUs:
		DEC A
		JNZ Jump_DelayUs
	#pragma endasm
}

void DelayUs2(void) {
	#pragma asm
		MOV A,#0x00 // START
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x01 //0
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x00 //1
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x00 //2
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x00 //3
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x01 //4
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x01 //5
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x00 //6
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x00 //7
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
		NOP

		MOV A,#0x01 //STOP
		RRC A
		MOV (0xB0.4),C
		NOP
		NOP
		NOP
	#pragma endasm
}


signed int ReadByte(void) {
	#pragma asm
		CLR DSR_USB
		MOV R7,#0xFF
		MOV R6,#0x08
Wait_Start:
		MOV C,RxD_USB
		JNC Read_0
		DJNZ R7,Wait_Start
		SETB DSR_USB
		MOV R6,#0xFF
		MOV R7,#0xFF
		JMP Read_End
Read_0:
		CLR A	
Read_1:
		NOP	
		NOP	
		NOP	
		MOV C,RxD_USB
		RLC	A
		DJNZ R6,Read_1
		MOV R6,#0x08
		SETB DSR_USB
Read_2:
		RRC A
		XCH A,R7
		RLC A
		XCH A,R7
		DJNZ R6,Read_2
		MOV R6,#0x00
Read_End:
	#pragma endasm
}



void SendByte(unsigned char data_byte) {
	TxD_USB = 0;
    EA = 0;
//	data_byte++;
	#pragma asm
		MOV R6,#0x08
Jump:
		MOV A,R7  //data_byte
		RRC A
		MOV R7,A
		MOV (0xB0.4),C
		NOP
		DJNZ R6,Jump
		NOP
		NOP
		NOP
	#pragma endasm
	TxD_USB = 1;
    EA = 0;  // Do odblokowania potem
}