From fdd15a254c6fab5ba2d02320ba0ceb3e6a56354c Mon Sep 17 00:00:00 2001 From: Anthony Towns Date: Sat, 26 Feb 2011 11:48:30 +1000 Subject: [PATCH] ao_intflash: Use internal flash for storage Makes any free pages at end of CC1111's internal flash available via the ao_storage API. --- src/ao_intflash.c | 204 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 204 insertions(+) create mode 100644 src/ao_intflash.c diff --git a/src/ao_intflash.c b/src/ao_intflash.c new file mode 100644 index 00000000..ad5e5aac --- /dev/null +++ b/src/ao_intflash.c @@ -0,0 +1,204 @@ +/* + * Copyright © 2011 Anthony Towns + * + * 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 "cc1111.h" + +#define FCTL_BUSY (1 << 7) +#define FCTL_SWBSY (1 << 6) +#define FCTL_CONTRD_ENABLE (1 << 4) +#define FCTL_WRITE (1 << 1) +#define FCTL_ERASE (1 << 0) + +#define ENDOFCODE (0x51f0 + 1500) +#define NUM_PAGES ((0x8000-ENDOFCODE)/1024) +#define SIZE (1024*NUM_PAGES) +#define LOCN (0x8000 - SIZE) + +#if NUM_PAGES < 1 +#error "Too few pages" +#endif + +#if LOCN % 1024 != 0 +#error "Pages aren't aligned properly" +#endif + +__xdata __at(LOCN) uint8_t ao_intflash[SIZE]; + +/* Total bytes of available storage */ +__xdata uint32_t ao_storage_total = sizeof(ao_intflash); + +/* Block size - device is erased in these units. */ +__xdata uint32_t ao_storage_block = 1024; + +/* Byte offset of config block. Will be ao_storage_block bytes long */ +__xdata uint32_t ao_storage_config = sizeof(ao_intflash); + +/* Storage unit size - device reads and writes must be within blocks of this size. */ +__xdata uint16_t ao_storage_unit = 1024; + +__xdata static uint8_t ao_intflash_dma_done; +static uint8_t ao_intflash_dma; + +/* + * The internal flash chip is arranged in 1kB sectors; the + * chip cannot erase in units smaller than that. + * + * Writing happens in units of 2 bytes and + * can only change bits from 1 to 0. So, you can rewrite + * the same contents, or append to an existing page easily enough + */ + +/* + * Erase the specified sector + */ +uint8_t +ao_storage_erase(uint32_t pos) __reentrant +{ + uint16_t addr; + + if (pos >= ao_storage_total || pos + ao_storage_block > ao_storage_total) + return 0; + + addr = ((uint16_t)(ao_intflash + pos) >> 1); + + while (FCTL & FCTL_BUSY) + ; + + FWT = 0x1F; // 21000 * f / 16e9 ; f = system freq = 24MHz + FADDRH = addr >> 8; + FADDRL = addr & ~0xFF00; + + _asm + .even + orl _FCTL, #FCTL_ERASE; ; FCTL |= FCTL_ERASE + nop; ; Required, see datasheet. + _endasm; + + while (FCTL & FCTL_BUSY) + ; + + return 1; +} + +/* + * Write to flash + */ + +static void +word_aligned_write(uint32_t pos, __xdata void *d, uint16_t len) __reentrant +{ + uint16_t addr; + + addr = ((uint16_t)(ao_intflash + pos) >> 1); + + ao_dma_set_transfer(ao_intflash_dma, d, &X_FWDATA, + DMA_LEN_HIGH_VLEN_LEN | len, + DMA_CFG0_WORDSIZE_8 | DMA_CFG0_TMODE_SINGLE | + DMA_CFG0_TRIGGER_FLASH, + DMA_CFG1_SRCINC_1 | DMA_CFG1_DESTINC_0 | + DMA_CFG1_IRQMASK | DMA_CFG1_PRIORITY_HIGH); + + while (FCTL & FCTL_BUSY) + ; + + FWT = 0x1F; // 21000 * f / 16e9 ; f = system freq = 24MHz + + FADDRH = addr >> 8; + FADDRL = addr & ~0xFF00; + + ao_dma_start(ao_intflash_dma); + + _asm + .even + orl _FCTL, #FCTL_WRITE; ; FCTL |= FCTL_WRITE + _endasm; + + __critical while (!ao_intflash_dma_done) + ao_sleep(&ao_intflash_dma_done); + + while (FCTL & (FCTL_BUSY | FCTL_SWBSY)) + ; +} + +uint8_t +ao_storage_device_write(uint32_t pos, __xdata void *v, uint16_t len) __reentrant +{ + static __xdata uint8_t b[2]; + __xdata uint8_t *d = v; + uint8_t oddlen; + + if (pos >= ao_storage_total || pos + len > ao_storage_total) + return 0; + if (len == 0) + return 1; + + if (pos & 1) { + b[0] = ~0; + b[1] = d[0]; + word_aligned_write(pos-1, b, 2); + pos++; + len--; + d++; + } + oddlen = len & 1; + len &= ~1; + if (len > 0) { + word_aligned_write(pos, d, len); + } + if (oddlen) { + b[0] = d[len]; + b[1] = ~0; + word_aligned_write(pos+len, b, 2); + } + + return 1; +} + +/* + * Read from flash + */ +uint8_t +ao_storage_device_read(uint32_t pos, __xdata void *d, uint16_t len) __reentrant +{ + if (pos >= ao_storage_total || pos + len > ao_storage_total) + return 0; + memcpy(d, ao_intflash+pos, len); + return 1; +} + +void +ao_storage_flush(void) __reentrant +{ +} + +void +ao_storage_setup(void) +{ +} + +void +ao_storage_device_info(void) __reentrant +{ + printf ("Using internal flash, starting at 0x%04x\n", LOCN); +} + +void +ao_storage_device_init(void) +{ + ao_intflash_dma = ao_dma_alloc(&ao_intflash_dma_done); +} -- 2.30.2