Lib. for Atmel 1Mbits Serial EEPROM, AT24C1024B
Dependents: LPC1114_data_logger dmx_to_stepper BSM02 LPC1114_barometer_with_data_logging
AT24C1024.cpp
- Committer:
- kenjiArai
- Date:
- 2014-06-29
- Revision:
- 1:05012e75c050
- Parent:
- 0:b9f5cf0309af
- Child:
- 2:36339fd174d0
File content as of revision 1:05012e75c050:
/* * mbed library program * Control AT24C1024 EEPROM * * Copyright (c) 2014 Kenji Arai / JH1PJL * http://www.page.sannet.ne.jp/kenjia/index.html * http://mbed.org/users/kenjiArai/ * Created: June 17th, 2014 * Revised: June 25th, 2014 * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "mbed.h" #include "AT24C1024.h" AT24C1024::AT24C1024 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) { AT24C1024_addr = AT24C1024ADDR; } AT24C1024::AT24C1024 (I2C& p_i2c) : i2c(p_i2c) { AT24C1024_addr = AT24C1024ADDR; } uint8_t AT24C1024::read(int addr) { uint8_t eep_dt[2]; uint8_t tmp_addr; tmp_addr = AT24C1024_addr; if ( addr & 0x10000 ){ // addr > 0xffff then P0 sets 1 tmp_addr += 0x02; // P0=1 } eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 ); eep_dt[1] = ( uint8_t )( (addr & 0xff) ); i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2); i2c_read_n_bytes((int)tmp_addr, (char *)eep_dt, 1); return eep_dt[0]; } void AT24C1024::write(int addr, uint8_t dt) { uint8_t eep_dt[3]; uint8_t tmp_addr; tmp_addr = AT24C1024_addr; if ( addr & 0x10000 ){ // addr > 0xffff then P0 sets 1 tmp_addr += 0x02; // P0=1 } eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 ); eep_dt[1] = ( uint8_t )( (addr & 0xff) ); eep_dt[2] = dt; i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 3); } AT24C_STATUS AT24C1024::read_page(uint32_t addr_page_top, uint8_t *dt, int size) { uint8_t eep_dt[2]; uint8_t tmp_addr; if (size >= 256 + 2){ if ((addr_page_top & 0xff) == 0){ tmp_addr = AT24C1024_addr; if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1 tmp_addr += 0x02; // P0=1 } eep_dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 ); eep_dt[1] = 0; i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2); i2c_read_n_bytes((int)tmp_addr, (char *)dt, 256); return AT24C_OK; } else { return AT24C_WRONG_TOP_ADDR; } } else { return AT24C_WRONG_BF_SIZE; } } AT24C_STATUS AT24C1024::write_page(uint32_t addr_page_top, uint8_t *dt, int size) { uint8_t tmp_addr; int i; if (size >= 256 + 2){ if ((addr_page_top & 0xff) == 0){ for (i = 255 + 2; i > 1; i--){ // shift data dt[i] = dt[i-2]; } tmp_addr = AT24C1024_addr; if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1 tmp_addr += 0x02; // P0=1 } dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 ); dt[1] = 0; i2c_write_n_bytes((int)tmp_addr, (char *)dt, 256 + 2); return AT24C_OK; } else { return AT24C_WRONG_TOP_ADDR; } } else { return AT24C_WRONG_BF_SIZE; } } void AT24C1024::i2c_read_n_bytes (int addr, char *dt, int n) { i2c.read(addr, dt, n); } void AT24C1024::i2c_write_n_bytes (int addr, char *dt, int n) { i2c.write(addr, dt, n); }