+++ /dev/null
-/*
- * Copyright © 2009 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"
-#include "25lc1024.h"
-
-#define EE_BLOCK_SIZE ((uint16_t) (256))
-#define EE_BLOCK_SHIFT 8
-#define EE_DEVICE_SIZE ((uint32_t) 128 * (uint32_t) 1024)
-
-/* Total bytes of available storage */
-__pdata uint32_t ao_storage_total;
-
-/* Block size - device is erased in these units. At least 256 bytes */
-__pdata uint32_t ao_storage_block;
-
-/* Byte offset of config block. Will be ao_storage_block bytes long */
-__pdata uint32_t ao_storage_config;
-
-/* Storage unit size - device reads and writes must be within blocks of this size. Usually 256 bytes. */
-__pdata uint16_t ao_storage_unit;
-
-/*
- * Using SPI on USART 0, with P1_2 as the chip select
- */
-
-#define EE_CS P1_2
-#define EE_CS_INDEX 2
-
-static __xdata uint8_t ao_ee_mutex;
-
-#define ao_ee_delay() do { \
- _asm nop _endasm; \
- _asm nop _endasm; \
- _asm nop _endasm; \
-} while(0)
-
-#define ao_ee_cs_low() ao_spi_get_bit(EE_CS)
-
-#define ao_ee_cs_high() ao_spi_put_bit(EE_CS)
-
-struct ao_ee_instruction {
- uint8_t instruction;
- uint8_t address[3];
-} __xdata ao_ee_instruction;
-
-static void
-ao_ee_write_enable(void)
-{
- ao_ee_cs_low();
- ao_ee_instruction.instruction = EE_WREN;
- ao_spi_send(&ao_ee_instruction, 1);
- ao_ee_cs_high();
-}
-
-static uint8_t
-ao_ee_rdsr(void)
-{
- ao_ee_cs_low();
- ao_ee_instruction.instruction = EE_RDSR;
- ao_spi_send(&ao_ee_instruction, 1);
- ao_spi_recv(&ao_ee_instruction, 1);
- ao_ee_cs_high();
- return ao_ee_instruction.instruction;
-}
-
-static void
-ao_ee_wrsr(uint8_t status)
-{
- ao_ee_cs_low();
- ao_ee_instruction.instruction = EE_WRSR;
- ao_ee_instruction.address[0] = status;
- ao_spi_send(&ao_ee_instruction, 2);
- ao_ee_cs_high();
-}
-
-#define EE_BLOCK_NONE 0xffff
-
-static __xdata uint8_t ao_ee_data[EE_BLOCK_SIZE];
-static __pdata uint16_t ao_ee_block = EE_BLOCK_NONE;
-static __pdata uint8_t ao_ee_block_dirty;
-
-/* Write the current block to the EEPROM */
-static void
-ao_ee_write_block(void)
-{
- uint8_t status;
-
- status = ao_ee_rdsr();
- if (status & (EE_STATUS_BP0|EE_STATUS_BP1|EE_STATUS_WPEN)) {
- status &= ~(EE_STATUS_BP0|EE_STATUS_BP1|EE_STATUS_WPEN);
- ao_ee_wrsr(status);
- }
- ao_ee_write_enable();
- ao_ee_cs_low();
- ao_ee_instruction.instruction = EE_WRITE;
- ao_ee_instruction.address[0] = ao_ee_block >> 8;
- ao_ee_instruction.address[1] = ao_ee_block;
- ao_ee_instruction.address[2] = 0;
- ao_spi_send(&ao_ee_instruction, 4);
- ao_spi_send(ao_ee_data, EE_BLOCK_SIZE);
- ao_ee_cs_high();
- for (;;) {
- uint8_t status = ao_ee_rdsr();
- if ((status & EE_STATUS_WIP) == 0)
- break;
- }
-}
-
-/* Read the current block from the EEPROM */
-static void
-ao_ee_read_block(void)
-{
- ao_ee_cs_low();
- ao_ee_instruction.instruction = EE_READ;
- ao_ee_instruction.address[0] = ao_ee_block >> 8;
- ao_ee_instruction.address[1] = ao_ee_block;
- ao_ee_instruction.address[2] = 0;
- ao_spi_send(&ao_ee_instruction, 4);
- ao_spi_recv(ao_ee_data, EE_BLOCK_SIZE);
- ao_ee_cs_high();
-}
-
-static void
-ao_ee_flush_internal(void)
-{
- if (ao_ee_block_dirty) {
- ao_ee_write_block();
- ao_ee_block_dirty = 0;
- }
-}
-
-static void
-ao_ee_fill(uint16_t block)
-{
- if (block != ao_ee_block) {
- ao_ee_flush_internal();
- ao_ee_block = block;
- ao_ee_read_block();
- }
-}
-
-uint8_t
-ao_storage_device_write(uint32_t pos, __xdata void *buf, uint16_t len) __reentrant
-{
- uint16_t block = (uint16_t) (pos >> EE_BLOCK_SHIFT);
-
- /* Transfer the data */
- ao_mutex_get(&ao_ee_mutex); {
- if (len != EE_BLOCK_SIZE)
- ao_ee_fill(block);
- else {
- ao_ee_flush_internal();
- ao_ee_block = block;
- }
- memcpy(ao_ee_data + (uint16_t) (pos & 0xff), buf, len);
- ao_ee_block_dirty = 1;
- } ao_mutex_put(&ao_ee_mutex);
- return 1;
-}
-
-uint8_t
-ao_storage_device_read(uint32_t pos, __xdata void *buf, uint16_t len) __reentrant
-{
- uint16_t block = (uint16_t) (pos >> EE_BLOCK_SHIFT);
-
- /* Transfer the data */
- ao_mutex_get(&ao_ee_mutex); {
- ao_ee_fill(block);
- memcpy(buf, ao_ee_data + (uint16_t) (pos & 0xff), len);
- } ao_mutex_put(&ao_ee_mutex);
- return 1;
-}
-
-void
-ao_storage_flush(void) __reentrant
-{
- ao_mutex_get(&ao_ee_mutex); {
- ao_ee_flush_internal();
- } ao_mutex_put(&ao_ee_mutex);
-}
-
-uint8_t
-ao_storage_erase(uint32_t pos) __reentrant
-{
- ao_mutex_get(&ao_ee_mutex); {
- ao_ee_flush_internal();
- ao_ee_block = (uint16_t) (pos >> EE_BLOCK_SHIFT);
- memset(ao_ee_data, 0xff, EE_BLOCK_SIZE);
- ao_ee_block_dirty = 1;
- } ao_mutex_put(&ao_ee_mutex);
- return 1;
-}
-
-static void
-ee_store(void) __reentrant
-{
-}
-
-void
-ao_storage_setup(void)
-{
- if (ao_storage_total == 0) {
- ao_storage_total = EE_DEVICE_SIZE;
- ao_storage_block = EE_BLOCK_SIZE;
- ao_storage_config = EE_DEVICE_SIZE - EE_BLOCK_SIZE;
- ao_storage_unit = EE_BLOCK_SIZE;
- }
-}
-
-void
-ao_storage_device_info(void) __reentrant
-{
-}
-
-/*
- * To initialize the chip, set up the CS line and
- * the SPI interface
- */
-void
-ao_storage_device_init(void)
-{
- /* set up CS */
- EE_CS = 1;
- P1DIR |= (1 << EE_CS_INDEX);
- P1SEL &= ~(1 << EE_CS_INDEX);
-}
projects / fw / altos / blobdiff