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33 * \brief Driver for the 24xx16 and 24xx256 I2C EEPROMS (implementation)
35 * \author Stefano Fedrigo <aleph@develer.com>
36 * \author Bernie Innocenti <bernie@codewiz.org>
41 #include "cfg/cfg_i2c.h"
42 #include "cfg/cfg_eeprom.h"
44 /* Define logging setting (for cfg/log.h module). */
45 #define LOG_LEVEL EEPROM_LOG_LEVEL
46 #define LOG_FORMAT EEPROM_LOG_FORMAT
48 #include <cfg/debug.h>
49 #include <cfg/macros.h> // MIN()
55 #include <string.h> // memset()
60 #define EEPROM_ID 0xA0
63 * This macros form the correct slave address for EEPROMs
65 #define EEPROM_ADDR(x) (EEPROM_ID | (((uint8_t)((x) & 0x07)) << 1))
69 * Array used to describe EEPROM memory devices currently supported.
71 static const EepromInfo mem_info[] =
75 .has_dev_addr = false,
81 .has_dev_addr = false,
104 /* Add other memories here */
107 STATIC_ASSERT(countof(mem_info) == EEPROM_CNT);
109 #define CHUNCK_SIZE 16
113 * \param eep is the Kblock context.
114 * \param addr eeprom address where start to erase
115 * \param size number of byte to erase
117 bool eeprom_erase(Eeprom *eep, e2addr_t addr, e2_size_t size)
119 uint8_t tmp[CHUNCK_SIZE] = { [0 ... (CHUNCK_SIZE - 1)] = 0xFF };
123 block_idx_t idx = addr / eep->blk.blk_size;
124 size_t offset = addr % eep->blk.blk_size;
125 size_t count = MIN(size, (e2_size_t)CHUNCK_SIZE);
126 size_t ret_len = eep->blk.priv.vt->writeDirect((KBlock *)eep, idx, tmp, offset, count);
130 if (ret_len != count)
138 * \param eep is the Kblock context.
139 * \param addr eeprom address where start to verify.
140 * \param buf buffer of data to compare with eeprom data read.
141 * \param size number of byte to verify.
143 bool eeprom_verify(Eeprom *eep, e2addr_t addr, const void *buf, size_t size)
145 uint8_t verify_buf[CHUNCK_SIZE];
148 block_idx_t idx = addr / eep->blk.blk_size;
149 size_t offset = addr % eep->blk.blk_size;
150 size_t count = MIN(size, (size_t)CHUNCK_SIZE);
152 size_t ret_len = eep->blk.priv.vt->readDirect((KBlock *)eep, idx, verify_buf, offset, count);
154 if (ret_len != count)
156 LOG_ERR("Verify read fail.\n");
160 if (memcmp(buf, verify_buf, ret_len) != 0)
162 LOG_ERR("Data mismatch!\n");
168 buf = ((const char *)buf) + ret_len;
174 static size_t eeprom_write(KBlock *blk, block_idx_t idx, const void *buf, size_t offset, size_t size)
176 Eeprom *eep = EEPROM_CAST_KBLOCK(blk);
177 e2dev_addr_t dev_addr;
180 uint32_t abs_addr = blk->blk_size * idx + offset;
182 STATIC_ASSERT(countof(addr_buf) <= sizeof(e2addr_t));
184 /* clamp size to memory limit (otherwise may roll back) */
185 ASSERT(idx < blk->priv.blk_start + blk->blk_cnt);
186 size = MIN(size, blk->blk_size - offset);
188 if (mem_info[eep->type].has_dev_addr)
190 dev_addr = eep->addr;
195 dev_addr = (e2dev_addr_t)((abs_addr >> 8) & 0x07);
199 if (mem_info[eep->type].has_dev_addr)
201 addr_buf[0] = (abs_addr >> 8) & 0xFF;
202 addr_buf[1] = (abs_addr & 0xFF);
206 dev_addr = (e2dev_addr_t)((abs_addr >> 8) & 0x07);
207 addr_buf[0] = (abs_addr & 0xFF);
210 i2c_start_w(eep->i2c, EEPROM_ADDR(dev_addr), addr_len + size, I2C_STOP);
211 i2c_write(eep->i2c, addr_buf, addr_len);
212 i2c_write(eep->i2c, buf, size);
214 if (i2c_error(eep->i2c))
220 static size_t eeprom_readDirect(struct KBlock *_blk, block_idx_t idx, void *_buf, size_t offset, size_t size)
222 Eeprom *blk = EEPROM_CAST_KBLOCK(_blk);
226 uint8_t *buf = (uint8_t *)_buf;
227 uint32_t abs_addr = mem_info[blk->type].blk_size * idx + offset;
229 STATIC_ASSERT(countof(addr_buf) <= sizeof(e2addr_t));
231 /* clamp size to memory limit (otherwise may roll back) */
232 ASSERT(idx < blk->blk.priv.blk_start + blk->blk.blk_cnt);
233 size = MIN(size, blk->blk.blk_size - offset);
235 e2dev_addr_t dev_addr;
236 if (mem_info[blk->type].has_dev_addr)
238 dev_addr = blk->addr;
240 addr_buf[0] = (abs_addr >> 8) & 0xFF;
241 addr_buf[1] = (abs_addr & 0xFF);
245 dev_addr = (e2dev_addr_t)((abs_addr >> 8) & 0x07);
247 addr_buf[0] = (abs_addr & 0xFF);
251 i2c_start_w(blk->i2c, EEPROM_ADDR(dev_addr), addr_len, I2C_NOSTOP);
252 i2c_write(blk->i2c, addr_buf, addr_len);
254 i2c_start_r(blk->i2c, EEPROM_ADDR(dev_addr), size, I2C_STOP);
255 i2c_read(blk->i2c, buf, size);
257 if (i2c_error(blk->i2c))
265 static size_t eeprom_writeDirect(KBlock *blk, block_idx_t idx, const void *buf, size_t offset, size_t size)
267 Eeprom *eep = EEPROM_CAST_KBLOCK(blk);
269 return eeprom_write(blk, idx, buf, offset, size);
275 uint8_t verify_buf[CHUNCK_SIZE];
280 /* Split read in smaller pieces */
281 size_t count = MIN(size, (size_t)CHUNCK_SIZE);
282 if ((wr_len = eeprom_write(blk, idx, buf, offset, count)) != 0)
284 if (eeprom_readDirect(blk, idx, verify_buf, offset, count) != wr_len)
286 LOG_ERR("Verify read fail.\n");
289 else if (memcmp(buf, verify_buf, wr_len) != 0)
291 LOG_ERR("Data mismatch!\n");
297 LOG_ERR("Write fail.\n");
302 buf = ((const char *)buf) + wr_len;
311 static int kblockEeprom_dummy(UNUSED_ARG(struct KBlock *,b))
317 static const KBlockVTable eeprom_unbuffered_vt =
319 .readDirect = eeprom_readDirect,
320 .writeDirect = eeprom_writeDirect,
322 .error = kblockEeprom_dummy,
323 .clearerr = (kblock_clearerr_t)kblockEeprom_dummy,
327 * Initialize EEPROM module.
328 * \param eep is the Kblock context.
329 * \param type is the eeprom device we want to initialize (\see EepromType)
330 * \param i2c context for i2c channel
331 * \param addr is the i2c devide address (usually pins A0, A1, A2).
332 * \param verify enable the write check.
334 void eeprom_init_5(Eeprom *eep, I2c *i2c, EepromType type, e2dev_addr_t addr, bool verify)
336 ASSERT(type < EEPROM_CNT);
338 memset(eep, 0, sizeof(*eep));
339 DB(eep->blk.priv.type = KBT_EEPROM);
344 eep->verify = verify;
346 eep->blk.blk_size = mem_info[type].blk_size;
347 eep->blk.blk_cnt = mem_info[type].e2_size / mem_info[type].blk_size;
348 eep->blk.priv.flags |= KB_PARTIAL_WRITE;
349 eep->blk.priv.vt = &eeprom_unbuffered_vt;