AT24C1024.cpp

00001 /*
00002  * mbed library program
00003  *  Control AT24C1024 EEPROM
00004  *
00005  * Copyright (c) 2014,'15,'17 Kenji Arai / JH1PJL
00006  *  http://www.page.sannet.ne.jp/kenjia/index.html
00007  *  http://mbed.org/users/kenjiArai/
00008  *      Created: June       17th, 2014
00009  *      Revised: August     23rd, 2017
00010  */
00011 
00012 #include "mbed.h"
00013 #include "AT24C1024.h"
00014 
00015 AT24C1024::AT24C1024 (PinName p_sda, PinName p_scl)
00016  : _i2c_p(new I2C(p_sda, p_scl)), _i2c(*_i2c_p)
00017 {
00018     AT24C1024_addr = AT24C1024ADDR;
00019 }
00020 
00021 AT24C1024::AT24C1024 (I2C& p_i2c)
00022  : _i2c(p_i2c)
00023 {
00024     AT24C1024_addr = AT24C1024ADDR;
00025 }
00026 
00027 uint8_t AT24C1024::read(uint32_t addr)
00028 {
00029     uint8_t eep_dt[2];
00030     uint8_t tmp_addr;
00031 
00032     tmp_addr = AT24C1024_addr;
00033     if ( addr & 0x10000 ) { // addr > 0xffff then P0 sets 1
00034         tmp_addr += 0x02;       // P0=1
00035     }
00036     eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
00037     eep_dt[1] = ( uint8_t )( (addr & 0xff) );
00038     _i2c.write((uint8_t)tmp_addr, (char *)eep_dt, 2);
00039     _i2c.read((uint8_t)tmp_addr, (char *)eep_dt, 1);
00040     return eep_dt[0];
00041 }
00042 
00043 void AT24C1024::write(uint32_t addr, uint8_t dt)
00044 {
00045     uint8_t eep_dt[3];
00046     uint8_t tmp_addr;
00047 
00048     tmp_addr = AT24C1024_addr;
00049     if ( addr & 0x10000 ) { // addr > 0xffff then P0 sets 1
00050         tmp_addr += 0x02;       // P0=1
00051     }
00052     eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
00053     eep_dt[1] = ( uint8_t )( (addr & 0xff) );
00054     eep_dt[2] = dt;
00055     _i2c.write((uint8_t)tmp_addr, (char *)eep_dt, 3);
00056 }
00057 
00058 AT24C_STATUS AT24C1024::read_page(uint32_t addr_page_top, uint8_t *dt, int size)
00059 {
00060     uint8_t eep_dt[2];
00061     uint8_t tmp_addr;
00062 
00063     if (size >= 256 + 2) {
00064         if ((addr_page_top & 0xff) == 0) {
00065             tmp_addr = AT24C1024_addr;
00066             if ( addr_page_top & 0x10000 ) { // addr > 0xffff then P0 sets 1
00067                 tmp_addr += 0x02;               // P0=1
00068             }
00069             eep_dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
00070             eep_dt[1] = 0;
00071             _i2c.write((uint8_t)tmp_addr, (char *)eep_dt, 2);
00072             _i2c.read((uint8_t)tmp_addr, (char *)dt, 256);
00073             return AT24C_OK;
00074         } else {
00075             return AT24C_WRONG_TOP_ADDR;
00076         }
00077     } else {
00078         return AT24C_WRONG_BF_SIZE;
00079     }
00080 }
00081 
00082 AT24C_STATUS AT24C1024::write_page(uint32_t addr_page_top, uint8_t *dt, int size)
00083 {
00084     uint8_t tmp_addr;
00085     int i;
00086 
00087     if (size >= 256 + 2) {
00088         if ((addr_page_top & 0xff) == 0) {
00089             for (i = 255 + 2; i > 1; i--) { // shift data
00090                 dt[i] = dt[i-2];
00091             }
00092             tmp_addr = AT24C1024_addr;
00093             if ( addr_page_top & 0x10000 ) { // addr > 0xffff then P0 sets 1
00094                 tmp_addr += 0x02;               // P0=1
00095             }
00096             dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
00097             dt[1] = 0;
00098             _i2c.write((uint8_t)tmp_addr, (char *)dt, 256 + 2);
00099             return AT24C_OK;
00100         } else {
00101             return AT24C_WRONG_TOP_ADDR;
00102         }
00103     } else {
00104         return AT24C_WRONG_BF_SIZE;
00105     }
00106 }
00107 
00108 void AT24C1024::frequency(int hz)
00109 {
00110     _i2c.frequency(hz);
00111 }
00112 
00113