From 6cfb2d3b1c75916ee69d069519edc675e37e1aa1 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Fri, 12 Oct 2012 14:26:08 -0700 Subject: [PATCH] altos: Add (untested) driver for AT24C i2c flash parts Signed-off-by: Keith Packard --- src/drivers/ao_at24c.c | 104 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 src/drivers/ao_at24c.c diff --git a/src/drivers/ao_at24c.c b/src/drivers/ao_at24c.c new file mode 100644 index 00000000..2a23be3a --- /dev/null +++ b/src/drivers/ao_at24c.c @@ -0,0 +1,104 @@ +/* + * Copyright © 2012 Keith Packard + * + * 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 + +#if HAS_EEPROM +#define AO_AT24C_ADDR 0xa0 +#define AO_AT24C_ADDR_WRITE (AO_AT24C_ADDR|0) +#define AO_AT24C_ADDR_READ (AO_AT24C_ADDR|1) +#define AO_AT24C_PAGE_LEN 128 + +/* Total bytes of available storage */ +__pdata ao_pos_t ao_storage_total = 64l * 1024l; + +/* Storage unit size - device reads and writes must be within blocks of this size. */ +__pdata uint16_t ao_storage_unit = 128; + +static void +ao_at24c_set_address(uint8_t addr, ao_pos_t pos) +{ + uint8_t a[2]; + + a[0] = pos >> 8; + a[1] = pos; + ao_i2c_start_bus(addr); + ao_i2c_send_bus(a, 2, 0); +} + +/* + * Erase the specified sector + */ +uint8_t +ao_storage_erase(ao_pos_t pos) __reentrant +{ + if (pos >= ao_storage_total || pos + AO_AT24C_PAGE_LEN > ao_storage_total) + return 0; + + ao_mutex_get(&ao_at24c_mutex); + ao_at24c_set_address(AO_AT24C_ADDR_WRITE, pos); + ao_i2c_send_fixed_bus(0xff, AO_AT24C_PAGE_LEN, 1); + ao_mutex_put(&ao_at24c_mutex); + return 1; +} + +/* + * Write to flash + */ +uint8_t +ao_storage_device_write(ao_pos_t pos, __xdata void *d, uint16_t len) __reentrant +{ + if (pos >= ao_storage_total || pos + len > ao_storage_total) + return 0; + + ao_mutex_get(&ao_m25_mutex); + ao_at24c_set_address(AO_AT24C_ADDR_WRITE, pos); + ao_i2c_send_bus(d, len, 1); + ao_mutex_put(&ao_m25_mutex); + return 1; +} + +/* + * Read from flash + */ +uint8_t +ao_storage_device_read(ao_pos_t pos, __xdata void *d, uint16_t len) __reentrant +{ + if (pos >= ao_storage_total || pos + len > ao_storage_total) + return 0; + ao_mutex_get(&ao_m25_mutex); + ao_at24c_set_address(AO_AT24C_ADDR_READ, pos); + ao_i2c_recv_bus(d, len, 1); + ao_mutex_put(&ao_m25_mutex); + return 1; +} + +void +ao_storage_flush(void) __reentrant +{ +} + +void +ao_storage_setup(void) +{ +} + +void +ao_storage_device_init(void) +{ +} +#endif -- 2.30.2