Getting started ATtiny 1 & 0 series / Application Notes

Log in or register to post comments
Go To Last Post
55 posts / 0 new
View All

Pages

gchapman
gchapman's picture
Level: 10k+ Postman
Joined: Tue. Jan 9, 2007
Posts: 12946 View posts
Location: Clay County, Texas, u.S.A.
Posted by gchapman: Mon. Oct 19, 2020 - 06:21 PM (Reply to #51)
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

<avr/eeprom.h>: EEPROM handling | AVR Libc

util/twi.h | AVR Libc

https://github.com/microchip-pic-avr-examples/?q=twi

the examples repositories are a WIP

 

"Dare to be naïve." - Buckminster Fuller

Top
Gold Markclawson
clawson's picture
Level: Moderator
Joined: Mon. Jul 18, 2005
Posts: 100751 View posts
Location: (using avr-gcc in) Finchingfield, Essex, England
Posted by clawson: Mon. Oct 19, 2020 - 08:12 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

DrDavid wrote:
 I did not see any library entries in the GCC documentation for either the EEProm or the TWI. 
Your probably looking in the wrong place - try start.atmel.com (and contemplate why that's still in the "atmel" domain not the microchip domain! ;-)

Top
obdevel
obdevel's picture
Level: Hangaround
Joined: Sun. Dec 22, 2019
Posts: 421 View posts
Location: Cambridge, UK
Posted by obdevel: Mon. Oct 19, 2020 - 10:49 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

avr-libc hasn't caught up yet with this chip family.

 

There is a new Arduino core (https://github.com/SpenceKonde/D...) that will give you some working code. The EEPROM code is known to work as I have an AVR128DA28 here in front of me. The I2C (Wire) library as works well.

 

Or you could install MPLABX and use MCC to generate some code.

 

Top
Gold Markclawson
clawson's picture
Level: Moderator
Joined: Mon. Jul 18, 2005
Posts: 100751 View posts
Location: (using avr-gcc in) Finchingfield, Essex, England
Posted by clawson: Tue. Oct 20, 2020 - 08:28 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

obdevel wrote:
avr-libc hasn't caught up yet with this chip family.
You sure? I just built:

#include <avr/io.h>
#include <avr/eeprom.h>

uint16_t EEMEM foo;

int main(void)
{
	eeprom_write_word(&foo, 12345);
	asm("nop");
	TCA0.SINGLE.CNT = eeprom_read_word(&foo);
	while (1)
	{
	}
}

which generated:

int main(void)
{
	eeprom_write_word(&foo, 12345);
  fe:	69 e3       	ldi	r22, 0x39	; 57
 100:	70 e3       	ldi	r23, 0x30	; 48
 102:	80 e0       	ldi	r24, 0x00	; 0
 104:	90 e0       	ldi	r25, 0x00	; 0
 106:	0d d0       	rcall	.+26     	; 0x122 <eeprom_write_word>
	asm("nop");
 108:	00 00       	nop
	TCA0.SINGLE.CNT = eeprom_read_word(&foo);
 10a:	80 e0       	ldi	r24, 0x00	; 0
 10c:	90 e0       	ldi	r25, 0x00	; 0
 10e:	05 d0       	rcall	.+10     	; 0x11a <eeprom_read_word>
 110:	80 93 20 0a 	sts	0x0A20, r24	; 0x800a20 <__TEXT_REGION_LENGTH__+0x7e0a20>
 114:	90 93 21 0a 	sts	0x0A21, r25	; 0x800a21 <__TEXT_REGION_LENGTH__+0x7e0a21>
 118:	ff cf       	rjmp	.-2      	; 0x118 <main+0x1a>

0000011a <eeprom_read_word>:
 11a:	0a d0       	rcall	.+20     	; 0x130 <eeprom_mapen>
 11c:	80 81       	ld	r24, Z
 11e:	91 81       	ldd	r25, Z+1	; 0x01
 120:	08 95       	ret

00000122 <eeprom_write_word>:
 122:	0a d0       	rcall	.+20     	; 0x138 <eeprom_write_byte>
 124:	27 2f       	mov	r18, r23
 126:	09 c0       	rjmp	.+18     	; 0x13a <eeprom_write_r18>

00000128 <eeprom_read_byte>:
 128:	03 d0       	rcall	.+6      	; 0x130 <eeprom_mapen>
 12a:	80 81       	ld	r24, Z
 12c:	99 27       	eor	r25, r25
 12e:	08 95       	ret

00000130 <eeprom_mapen>:
 130:	fc 01       	movw	r30, r24
 132:	e0 50       	subi	r30, 0x00	; 0
 134:	fc 4e       	sbci	r31, 0xEC	; 236
 136:	08 95       	ret

00000138 <eeprom_write_byte>:
 138:	26 2f       	mov	r18, r22

0000013a <eeprom_write_r18>:
 13a:	af 93       	push	r26
 13c:	bf 93       	push	r27
 13e:	e0 e0       	ldi	r30, 0x00	; 0
 140:	f0 e1       	ldi	r31, 0x10	; 16
 142:	32 81       	ldd	r19, Z+2	; 0x02
 144:	31 fd       	sbrc	r19, 1
 146:	fd cf       	rjmp	.-6      	; 0x142 <eeprom_write_r18+0x8>
 148:	dc 01       	movw	r26, r24
 14a:	a0 50       	subi	r26, 0x00	; 0
 14c:	bc 4e       	sbci	r27, 0xEC	; 236
 14e:	2c 93       	st	X, r18
 150:	2d e9       	ldi	r18, 0x9D	; 157
 152:	24 bf       	out	0x34, r18	; 52
 154:	23 e0       	ldi	r18, 0x03	; 3
 156:	20 83       	st	Z, r18
 158:	01 96       	adiw	r24, 0x01	; 1
 15a:	bf 91       	pop	r27
 15c:	af 91       	pop	r26
 15e:	08 95       	ret

Are you saying this is generating the "wrong code" for accessing the EEPROM on 128DA28 ?

Top

Pages

View All