SD Card CMD1 error - Card not init.

[Gigillo74]

Dear all,
i try to init my SD card with ATMEGA8 and i don't reach the goal becouse the CMD1 don't return 0x00.
I attach my ASM code and i ask someone if can explain me if there is a mistake in code.
Thank You.
Luigi.

;********************************************************
;*        LIBRERIA DI FUNZIONI PER UTILIZZO DI SD CARD	*	
;*							*	
;* Nome: 	SD.inc					*	
;* Versione:	1.0					*
;* Data:		14/01/2012			*
;* Autore:	Luigi Erroi				*	
;*							*
;* Registri utilizzati:	Work 				*
;*							*
;* Variabili Utilizzate:	NESSUNA			*	
;*							*
;********************************************************

.EQU 	PortaSD 	= PORTB	; definisce porta della scheda SD
.EQU 	CS 	= 0	; Pin CS della scheda SD

CMD0DATA:	.db	0x40,0x00,0x00,0x00,0x00,0x95	; SD card cmd 0
CMD1DATA:	.db	0x41,0x00,0x00,0x00,0x00,0xFF	; SD card cmd 1
CMD9DATA:	.db	0x49,0x00,0x00,0x00,0x00,0xFF	; SD card cmd 9
CMD8DATA:	.db	0x48,0x00,0x00,0x01,0xAA,0x87	; SD card cmd 8
CMD41DATA:	.db	0x69,0x00,0x00,0x00,0x00,0xE5	; SD card cmd 41
CMD55DATA:	.db	0x77,0x00,0x00,0x00,0x00,0x65	; SD card cmd 55
CMD58DATA:	.db	0x7A,0x00,0x00,0x00,0x00,0xFD	; SD card cmd 55




;*******************************************
; Inizializzazione della scheda SD
;*******************************************
SD_Init:
	sbi	PortaSD,CS		

	push	R23

	ldi	R23,10
	ldi	Work,0xFF

SD_Init_Seq:
	dec	R23
	breq	SD_Init_Seq2
	rcall	SPI_TX
	rjmp	SD_Init_Seq

SD_Init_Seq2:
	
	
	rcall	CMD0_Send


	ldi	R23,8

SD_CMD0_Loop:

	dec	R23
	breq	SD_Init_Exit

	rcall	SPI_RX

	cpi	Work,0x01
	brne	SD_CMD0_Loop



	ldi	Work,0x10
	rcall	Lcdlocate

	ldi	Work,'O'
	rcall	LcdSendData

	ldi	Work,'K'
	rcall	LcdSendData


	rcall	CMD8_Send


	ldi	R23,8

SD_CMD8_Loop:

	dec	R23
	breq	SD_Init_Exit2

	rcall	SPI_RX

	cpi	Work,0x05
	brne	SD_CMD8_Loop

	ldi	Work,0x12
	rcall	Lcdlocate

	ldi	Work,'O'
	rcall	LcdSendData

	ldi	Work,'K'
	rcall	LcdSendData

	ldi	R23,8

	rcall	CMD58_Send

SD_CMD58_Loop:

	dec	R23
	breq	SD_Init_Exit3

	rcall	SPI_RX

	cpi	Work,0x01
	brne	SD_CMD58_Loop

	ldi	Work,0x14
	rcall	Lcdlocate

	ldi	Work,'O'
	rcall	LcdSendData

	ldi	Work,'K'
	rcall	LcdSendData

SD_CMD1_:

	ldi	R23,255


	rcall	CMD1_Send



SD_CMD1_Loop:


	dec	R23
	breq	SD_Init_Exit4

	rcall	SPI_RX

	cpi	Work,0x00
	brne	SD_CMD1_Loop

	ldi	Work,0x16
	rcall	Lcdlocate

	ldi	Work,'O'
	rcall	LcdSendData

	ldi	Work,'K'
	rcall	LcdSendData

	pop	R23

	sbi	PortaSD,CS

	ret

SD_Init_Exit:

	pop	R23

	ldi	Work,0x10
	rcall	Lcdlocate

	ldi	Work,'E'
	rcall	LcdSendData

	ldi	Work,'R'
	rcall	LcdSendData

	ret

SD_Init_Exit2:
	pop	R23

	ldi	Work,0x12
	rcall	Lcdlocate

	ldi	Work,'E'
	rcall	LcdSendData

	ldi	Work,'R'
	rcall	LcdSendData

	ret

SD_Init_Exit3:
	pop	R23

	ldi	Work,0x14
	rcall	Lcdlocate

	ldi	Work,'E'
	rcall	LcdSendData

	ldi	Work,'R'
	rcall	LcdSendData

	ret


SD_Init_Exit4:
	pop	R23

	ldi	Work,0x16
	rcall	Lcdlocate

	ldi	Work,'E'
	rcall	LcdSendData

	ldi	Work,'R'
	rcall	LcdSendData

	ret

;*******************************************
; Invio del CMD0 **** SD
;*******************************************
CMD0_Send:
	cbi	PortaSD,CS		; Seleziona CS (Attivo Basso)
	ldi	zh,high(CMD0DATA<<1)	; send cmd9
	ldi	zl,low(CMD0DATA<<1)
	rcall	Send_SD_Cmd
	ret

;*******************************************
; Invio del CMD0 **** SD
;*******************************************
CMD1_Send:
	cbi	PortaSD,CS		; Seleziona CS (Attivo Basso)
	ldi	zh,high(CMD1DATA<<1)	; send cmd9
	ldi	zl,low(CMD1DATA<<1)
	rcall	Send_SD_Cmd
	ret



;*******************************************
; Invio del CMD8 **** SD
;*******************************************
CMD8_Send:
	cbi	PortaSD,CS		; Seleziona CS (Attivo Basso)
	ldi	zh,high(CMD8DATA<<1)	; send cmd9
	ldi	zl,low(CMD8DATA<<1)
	rcall	Send_SD_Cmd
	ret


;*******************************************
; Invio del CMD58 **** SD
;*******************************************
CMD58_Send:
	cbi	PortaSD,CS		; Seleziona CS (Attivo Basso)
	ldi	zh,high(CMD58DATA<<1)	; send cmd9
	ldi	zl,low(CMD58DATA<<1)
	rcall	Send_SD_Cmd
	ret



;*******************************************
; Invio del ACMD41 **** SD
;*******************************************
ACMD41_Send:
	cbi	PortaSD,CS		; Seleziona CS (Attivo Basso)

	ldi	zh,high(CMD55DATA<<1)	; send cmd9
	ldi	zl,low(CMD55DATA<<1)
	rcall	Send_SD_Cmd

	ldi	zh,high(CMD41DATA<<1)	; send cmd9
	ldi	zl,low(CMD41DATA<<1)
	rcall	Send_SD_Cmd

	ret


;*******************************************
; Invio del Comando **** scheda SD su SPI
;	
; Z - punta ai 6 byte del comando
;*******************************************

Send_SD_Cmd:

	push	Work
	push	r18

	ldi	r18,6		; command frames are 6 bytes

SSC_Loop:

	lpm	Work,z+		; send them out
	rcall	SPI_TX
	dec	r18		; repeat until done
	brne	SSC_Loop

	pop	r18
	pop	Work
	
	ret