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-rw-r--r--n/avr/modules/twi/master/twi_master.c214
1 files changed, 0 insertions, 214 deletions
diff --git a/n/avr/modules/twi/master/twi_master.c b/n/avr/modules/twi/master/twi_master.c
deleted file mode 100644
index 41a3f6d..0000000
--- a/n/avr/modules/twi/master/twi_master.c
+++ /dev/null
@@ -1,214 +0,0 @@
-/* twi_master.c */
-/* avr.twi.master - TWI master module. {{{
- *
- * Copyright (C) 2005 Clément Demonchy
- *
- * Robot APB Team/Efrei 2006.
- * Web: http://assos.efrei.fr/robot/
- * Email: robot AT efrei DOT fr
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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 "common.h"
-#include "twi_master.h"
-
-#include "io.h"
-
-#include <compat/twi.h>
-
-enum
-{
- TWI_SUCCESS,
- TWI_BUSY,
- TWI_FREE,
- TWI_FAILURE
-};
-
-#if 0
-#define TWI_DEBUG(x) uart0_putc (x)
-#else
-#define TWI_DEBUG(x)
-#endif
-
-#define NB_RETRY 5
-
-static uint8_t *buffer;
-static uint8_t twi_dest_addr;
-static uint8_t twi_len;
-static uint8_t twi_idx;
-static uint8_t twi_nb_retry;
-volatile uint8_t twi_state = TWI_FREE;
-
-void
-twi_master_init (void)
-{
- /* initialize TWI clock: 100 kHz clock, TWPS = 0 => prescaler = 1 */
-#if defined(TWPS0)
- TWSR = 0;
-#endif
- TWBR = (AC_FREQ / 100000UL - 16) / 2;
- TWCR = _BV (TWEN) | _BV (TWIE);
-}
-
-int8_t
-twi_master_is_finished ()
-{
- if (twi_state == TWI_SUCCESS || twi_state == TWI_FAILURE)
- {
- twi_state = TWI_FREE;
- return 1;
- }
- else
- return 0;
-}
-
-int8_t
-twi_master_send (uint8_t addr, uint8_t *data, uint8_t len)
-{
- if (twi_state == TWI_FREE)
- {
- TWI_DEBUG ('a');
- twi_state = TWI_BUSY;
- twi_nb_retry = 0;
- twi_dest_addr = addr & 0xfe;
- twi_len = len;
- buffer = data;
- /* envoie du start */
- TWCR |= _BV(TWSTA);
- TWCR |= _BV(TWINT);
- return 0;
- }
- else
- {
- TWI_DEBUG ('x');
- return -1;
- }
-}
-
-int8_t
-twi_master_read (uint8_t addr, uint8_t *data, uint8_t len)
-{
- if (twi_state == TWI_FREE)
- {
- TWI_DEBUG ('a');
- twi_state = TWI_BUSY;
- twi_nb_retry = 0;
- twi_dest_addr = addr | 0x01;
- twi_len = len;
- buffer = data;
- TWCR |= _BV(TWSTA) | _BV (TWINT);
- return 0;
- }
- else
- return -1;
-}
-
-SIGNAL (SIG_2WIRE_SERIAL)
-{
- TWI_DEBUG ('y');
- switch (TW_STATUS)
- {
- /* Master */
- case TW_START:
- case TW_REP_START:
- /* start transmis, on envoie l'adresse */
- TWI_DEBUG ('d');
- TWCR &= ~ (_BV (TWSTA) | _BV (TWSTO) | _BV (TWINT));
- TWDR = twi_dest_addr;
- twi_idx = 0;
- break;
- case TW_MT_ARB_LOST: /* valable pour le receiver aussi */
- /* todo */
- TWI_DEBUG ('e');
- break;
- /* Master Transmitter */
- case TW_MT_DATA_ACK:
- case TW_MT_SLA_ACK:
- /* slave ok
- * On envoi des données si il en reste
- */
- if (twi_idx < twi_len)
- {
- TWI_DEBUG ('f');
- TWDR = buffer[twi_idx ++];
- }
- else
- {
- TWCR |= _BV (TWSTO);
- TWI_DEBUG ('g');
- twi_state = TWI_SUCCESS;
- }
- break;
- case TW_MT_SLA_NACK:
- /* le slave ne repond plus
- * on essaye NB_RETRY avant d'arreter
- */
- if (twi_nb_retry < NB_RETRY)
- {
- TWI_DEBUG ('h');
- TWCR |= _BV (TWSTA);
- twi_nb_retry ++;
- }
- else
- {
- TWI_DEBUG ('i');
- TWCR |= _BV (TWSTO);
- twi_state = TWI_FAILURE;
- }
- break;
- case TW_MT_DATA_NACK:
- /* le slave ne veut plus de donnée */
- TWI_DEBUG ('j');
- TWCR |= _BV (TWSTO);
- twi_state = TWI_SUCCESS;
- break;
- /* Master Receiver */
- case TW_MR_SLA_ACK:
- TWI_DEBUG ('p');
- if (twi_len > 1) /* on recoit plusieurs octet */
- {
- TWI_DEBUG ('k');
- TWCR |= _BV (TWEA);
- }
- break;
- case TW_MR_SLA_NACK:
- if (twi_nb_retry < NB_RETRY)
- {
- TWI_DEBUG ('l');
- TWCR |= _BV (TWEA);
- }
- else
- {
- TWI_DEBUG ('m');
- TWCR |= _BV (TWSTO);
- twi_state = TWI_FAILURE;
- }
- break;
- case TW_MR_DATA_ACK:
- buffer[twi_idx ++] = TWDR;
- TWI_DEBUG ('n');
- if (twi_idx == (twi_len - 1))
- TWCR &= ~ _BV (TWEA);
- break;
- case TW_MR_DATA_NACK: /* dernier byte */
- twi_state = TWI_SUCCESS;
- TWI_DEBUG ('o');
- buffer[twi_idx ++] = TWDR;
- TWCR |= _BV (TWSTO);
- break;
- }
- TWCR |= _BV (TWINT);
-}