diff options
Diffstat (limited to 'src/attiny/ao_eeprom_tiny.c')
| -rw-r--r-- | src/attiny/ao_eeprom_tiny.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/attiny/ao_eeprom_tiny.c b/src/attiny/ao_eeprom_tiny.c new file mode 100644 index 00000000..83014183 --- /dev/null +++ b/src/attiny/ao_eeprom_tiny.c @@ -0,0 +1,71 @@ +/* + * Copyright © 2012 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include <ao.h> + +static void +ao_eeprom_wait(void) +{ + /* Wait for previous write to complete */ + while (EECR & (1 << EEPE)) + ; +} + +static uint8_t +ao_eeprom_read_byte(uint16_t addr) +{ + uint8_t v; + + ao_eeprom_wait(); + EEAR = addr; + cli(); + EECR |= (1 << EERE); + v = EEDR; + sei(); + return v; +} + +static void +ao_eeprom_write_byte(uint16_t addr, uint8_t v) +{ + ao_eeprom_wait(); + EECR = (0 << EEPM1) | (0 << EEPM0); + EEAR = addr; + EEDR = v; + cli(); + EECR |= (1 << EEMPE); + EECR |= (1 << EEPE); + sei(); +} + +void +ao_eeprom_read(uint16_t addr, void *buf, uint16_t len) +{ + uint8_t *b = buf; + + while (len--) + *b++ = ao_eeprom_read_byte(addr++); +} + +void +ao_eeprom_write(uint16_t addr, void *buf, uint16_t len) +{ + uint8_t *b = buf; + + while (len--) + ao_eeprom_write_byte(addr++, *b++); +} |