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14 * GNU General Public License for more details.
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18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
33 * \brief Self programming routines.
36 * \author Francesco Sacchi <batt@develer.com>
37 * \author Daniele Basile <asterix@develer.com>
39 * This module implements a kfile-like access for Atmel avr
41 * Internal flash writing access is controlled by BOOTSZ fuses, check
42 * datasheet for details.
45 #include "flash_avr.h"
47 #include "cfg/cfg_flash_avr.h"
48 #include <cfg/macros.h> // MIN()
49 #include <cfg/compiler.h>
50 #include <cfg/debug.h>
55 #include <kern/kfile.h>
59 #include <avr/pgmspace.h>
66 * Definition of type for avr flash module.
68 typedef uint16_t avr_page_addr_t;
74 * Private avr flush funtion.
76 * Write current buffered page in flash memory (if modified).
77 * This function erase flash memory page before writing.
79 * This function is only use internaly in this module.
81 static void flash_avr_flush(KFileFlashAvr *fd)
85 kprintf("Flushing page %d\n", fd->curr_page);
87 // Wait while the SPM instruction is busy.
90 kprintf("Filling temparary page buffer...");
92 // Fill the temporary buffer of the AVR
93 for (avr_page_addr_t page_addr = 0; page_addr < SPM_PAGESIZE; page_addr += 2)
95 uint16_t word = ((uint16_t)fd->page_buf[page_addr + 1] << 8) | fd->page_buf[page_addr];
97 ATOMIC(boot_page_fill(page_addr, word));
103 kprintf("Erasing page, addr %u...", fd->curr_page * SPM_PAGESIZE);
106 ATOMIC(boot_page_erase(fd->curr_page * SPM_PAGESIZE));
108 /* Wait until the memory is erased. */
109 boot_spm_busy_wait();
112 kprintf("Writing page, addr %u...", fd->curr_page * SPM_PAGESIZE);
114 /* Store buffer in flash page. */
115 ATOMIC(boot_page_write(fd->curr_page * SPM_PAGESIZE));
116 boot_spm_busy_wait(); // Wait while the SPM instruction is busy.
119 * Reenable RWW-section again. We need this if we want to jump back
120 * to the application after bootloading.
122 ATOMIC(boot_rww_enable());
124 fd->page_dirty = false;
131 * Flush avr flash function.
133 * Write current buffered page in flash memory (if modified).
134 * This function erase flash memory page before writing.
136 static int flash_avr_kfileFlush(struct KFile *_fd)
138 KFileFlashAvr *fd = KFILEFLASHAVR(_fd);
145 * Check current page and if \a page is different, load it in
148 static void flash_avr_loadPage(KFileFlashAvr *fd, avr_page_t page)
150 if (page != fd->curr_page)
154 memcpy_P(fd->page_buf, (const char *)(page * SPM_PAGESIZE), SPM_PAGESIZE);
155 fd->curr_page = page;
156 kprintf("Loaded page %d\n", fd->curr_page);
161 * Write program memory.
162 * Write \a size bytes from buffer \a _buf to file \a fd
163 * \note Write operations are buffered.
165 static size_t flash_avr_write(struct KFile *_fd, const void *_buf, size_t size)
167 KFileFlashAvr *fd = KFILEFLASHAVR(_fd);
168 const uint8_t *buf =(const uint8_t *)_buf;
171 avr_page_addr_t page_addr;
172 size_t total_write = 0;
175 ASSERT(fd->fd.seek_pos + (kfile_off_t)size <= (kfile_off_t)fd->fd.size);
176 size = MIN((uint32_t)size, fd->fd.size - fd->fd.seek_pos);
178 kprintf("Writing at pos[%u]\n", fd->fd.seek_pos);
181 page = fd->fd.seek_pos / SPM_PAGESIZE;
182 page_addr = fd->fd.seek_pos % SPM_PAGESIZE;
184 flash_avr_loadPage(fd, page);
186 size_t wr_len = MIN(size, SPM_PAGESIZE - page_addr);
187 memcpy(fd->page_buf + page_addr, buf, wr_len);
188 fd->page_dirty = true;
191 fd->fd.seek_pos += wr_len;
193 total_write += wr_len;
195 kprintf("written %u bytes\n", total_write);
200 * Open flash file \a fd
201 * \a name and \a mode are unused, cause flash memory is
202 * threated like one file.
204 static void flash_avr_open(struct KFileFlashAvr *fd)
207 memcpy_P(fd->page_buf, (const char *)(fd->curr_page * SPM_PAGESIZE), SPM_PAGESIZE);
210 fd->fd.size = (uint16_t)(FLASHEND - CONFIG_FLASH_AVR_BOOTSIZE + 1);
211 fd->page_dirty = false;
213 kprintf("Flash file opened\n");
219 static int flash_avr_close(struct KFile *_fd)
221 KFileFlashAvr *fd = KFILEFLASHAVR(_fd);
223 kprintf("Flash file closed\n");
230 static struct KFile *flash_avr_reopen(struct KFile *fd)
232 KFileFlashAvr *_fd = KFILEFLASHAVR(fd);
240 * Read from file \a fd \a size bytes and put it in buffer \a buf
241 * \return the number of bytes read.
243 static size_t flash_avr_read(struct KFile *_fd, void *buf, size_t size)
245 KFileFlashAvr *fd = KFILEFLASHAVR(_fd);
246 ASSERT(fd->fd.seek_pos + (kfile_off_t)size <= (kfile_off_t)fd->fd.size);
247 size = MIN((uint32_t)size, fd->fd.size - fd->fd.seek_pos);
249 kprintf("Reading at pos[%u]\n", fd->fd.seek_pos);
250 // Flush current buffered page (if modified).
254 * AVR pointers are 16 bits wide, this hack is needed to avoid
255 * compiler warning, cause fd->seek_pos is a 32bit offset.
257 const uint8_t *pgm_addr = (const uint8_t *)0;
258 pgm_addr += fd->fd.seek_pos;
260 memcpy_P(buf, pgm_addr, size);
261 fd->fd.seek_pos += size;
262 kprintf("Read %u bytes\n", size);
267 * Init AVR flash read/write file.
269 void flash_avr_init(struct KFileFlashAvr *fd)
271 memset(fd, 0, sizeof(*fd));
272 DB(fd->fd._type = KFT_FLASHAVR);
274 // Set up flash programming functions.
275 fd->fd.reopen = flash_avr_reopen;
276 fd->fd.close = flash_avr_close;
277 fd->fd.read = flash_avr_read;
278 fd->fd.write = flash_avr_write;
279 fd->fd.seek = kfile_genericSeek;
280 fd->fd.flush = flash_avr_kfileFlush;