Kenji Arai / AT24C1024

Lib. for Atmel 1Mbits Serial EEPROM, AT24C1024B

Dependents:   LPC1114_data_logger dmx_to_stepper BSM02 LPC1114_barometer_with_data_logging

AT24C1024.cpp@0:b9f5cf0309af, 2014-06-22 (annotated)

Committer:
kenjiArai
Date:
Sun Jun 22 06:07:18 2014 +0000
Revision:
0:b9f5cf0309af
Child:
1:05012e75c050
put additional comments and small modification

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:b9f5cf0309af 1 /*
kenjiArai 0:b9f5cf0309af 2 * mbed library program
kenjiArai 0:b9f5cf0309af 3 * Control AT24C1024 EEPROM
kenjiArai 0:b9f5cf0309af 4 *
kenjiArai 0:b9f5cf0309af 5 * Copyright (c) 2014 Kenji Arai / JH1PJL
kenjiArai 0:b9f5cf0309af 6 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:b9f5cf0309af 7 * http://mbed.org/users/kenjiArai/
kenjiArai 0:b9f5cf0309af 8 * Created: June 17th, 2014
kenjiArai 0:b9f5cf0309af 9 * Revised: June 21st, 2014
kenjiArai 0:b9f5cf0309af 10 *
kenjiArai 0:b9f5cf0309af 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
kenjiArai 0:b9f5cf0309af 12 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
kenjiArai 0:b9f5cf0309af 13 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:b9f5cf0309af 14 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kenjiArai 0:b9f5cf0309af 15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:b9f5cf0309af 16 */
kenjiArai 0:b9f5cf0309af 17
kenjiArai 0:b9f5cf0309af 18 #include "mbed.h"
kenjiArai 0:b9f5cf0309af 19 #include "AT24C1024.h"
kenjiArai 0:b9f5cf0309af 20
kenjiArai 0:b9f5cf0309af 21 AT24C1024::AT24C1024 (PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl) {
kenjiArai 0:b9f5cf0309af 22 AT24C1024_addr = AT24C1024ADDR;
kenjiArai 0:b9f5cf0309af 23 }
kenjiArai 0:b9f5cf0309af 24
kenjiArai 0:b9f5cf0309af 25 AT24C1024::AT24C1024 (I2C& p_i2c) : i2c(p_i2c) {
kenjiArai 0:b9f5cf0309af 26 AT24C1024_addr = AT24C1024ADDR;
kenjiArai 0:b9f5cf0309af 27 }
kenjiArai 0:b9f5cf0309af 28
kenjiArai 0:b9f5cf0309af 29 uint8_t AT24C1024::read(int addr) {
kenjiArai 0:b9f5cf0309af 30 uint8_t eep_dt[2];
kenjiArai 0:b9f5cf0309af 31 uint8_t tmp_addr;
kenjiArai 0:b9f5cf0309af 32
kenjiArai 0:b9f5cf0309af 33 tmp_addr = AT24C1024_addr;
kenjiArai 0:b9f5cf0309af 34 if ( addr & 0x10000 ){ // addr > 0xffff then P0 sets 1
kenjiArai 0:b9f5cf0309af 35 tmp_addr += 0x02; // P0=1
kenjiArai 0:b9f5cf0309af 36 }
kenjiArai 0:b9f5cf0309af 37 eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
kenjiArai 0:b9f5cf0309af 38 eep_dt[1] = ( uint8_t )( (addr & 0xff) );
kenjiArai 0:b9f5cf0309af 39 i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2);
kenjiArai 0:b9f5cf0309af 40 i2c_read_n_bytes((int)tmp_addr, (char *)eep_dt, 1);
kenjiArai 0:b9f5cf0309af 41 return eep_dt[0];
kenjiArai 0:b9f5cf0309af 42 }
kenjiArai 0:b9f5cf0309af 43
kenjiArai 0:b9f5cf0309af 44 void AT24C1024::write(int addr, uint8_t dt) {
kenjiArai 0:b9f5cf0309af 45 uint8_t eep_dt[3];
kenjiArai 0:b9f5cf0309af 46 uint8_t tmp_addr;
kenjiArai 0:b9f5cf0309af 47
kenjiArai 0:b9f5cf0309af 48 tmp_addr = AT24C1024_addr;
kenjiArai 0:b9f5cf0309af 49 if ( addr & 0x10000 ){ // addr > 0xffff then P0 sets 1
kenjiArai 0:b9f5cf0309af 50 tmp_addr += 0x02; // P0=1
kenjiArai 0:b9f5cf0309af 51 }
kenjiArai 0:b9f5cf0309af 52 eep_dt[0] = ( uint8_t )( (addr & 0xff00) >> 8 );
kenjiArai 0:b9f5cf0309af 53 eep_dt[1] = ( uint8_t )( (addr & 0xff) );
kenjiArai 0:b9f5cf0309af 54 eep_dt[2] = dt;
kenjiArai 0:b9f5cf0309af 55 i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 3);
kenjiArai 0:b9f5cf0309af 56 }
kenjiArai 0:b9f5cf0309af 57
kenjiArai 0:b9f5cf0309af 58 AT24C_STATUS AT24C1024::read_page(uint32_t addr_page_top, uint8_t *dt, int size) {
kenjiArai 0:b9f5cf0309af 59 uint8_t eep_dt[2];
kenjiArai 0:b9f5cf0309af 60 uint8_t tmp_addr;
kenjiArai 0:b9f5cf0309af 61
kenjiArai 0:b9f5cf0309af 62 if (size >= 256 + 2){
kenjiArai 0:b9f5cf0309af 63 if ((addr_page_top & 0xff) == 0){
kenjiArai 0:b9f5cf0309af 64 tmp_addr = AT24C1024_addr;
kenjiArai 0:b9f5cf0309af 65 if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1
kenjiArai 0:b9f5cf0309af 66 tmp_addr += 0x02; // P0=1
kenjiArai 0:b9f5cf0309af 67 }
kenjiArai 0:b9f5cf0309af 68 eep_dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
kenjiArai 0:b9f5cf0309af 69 eep_dt[1] = 0;
kenjiArai 0:b9f5cf0309af 70 i2c_write_n_bytes((int)tmp_addr, (char *)eep_dt, 2);
kenjiArai 0:b9f5cf0309af 71 i2c_read_n_bytes((int)tmp_addr, (char *)dt, 256);
kenjiArai 0:b9f5cf0309af 72 return AT24C_OK;
kenjiArai 0:b9f5cf0309af 73 } else {
kenjiArai 0:b9f5cf0309af 74 return AT24C_WRONG_TOP_ADDR;
kenjiArai 0:b9f5cf0309af 75 }
kenjiArai 0:b9f5cf0309af 76 } else {
kenjiArai 0:b9f5cf0309af 77 return AT24C_WRONG_BF_SIZE;
kenjiArai 0:b9f5cf0309af 78 }
kenjiArai 0:b9f5cf0309af 79 }
kenjiArai 0:b9f5cf0309af 80
kenjiArai 0:b9f5cf0309af 81 AT24C_STATUS AT24C1024::write_page(uint32_t addr_page_top, uint8_t *dt, int size) {
kenjiArai 0:b9f5cf0309af 82 uint8_t tmp_addr;
kenjiArai 0:b9f5cf0309af 83 int i;
kenjiArai 0:b9f5cf0309af 84
kenjiArai 0:b9f5cf0309af 85 if (size >= 256 + 2){
kenjiArai 0:b9f5cf0309af 86 if ((addr_page_top & 0xff) == 0){
kenjiArai 0:b9f5cf0309af 87 for (i = 255 + 2; i > 1; i--){ // shift data
kenjiArai 0:b9f5cf0309af 88 dt[i] = dt[i-2];
kenjiArai 0:b9f5cf0309af 89 }
kenjiArai 0:b9f5cf0309af 90 tmp_addr = AT24C1024_addr;
kenjiArai 0:b9f5cf0309af 91 if ( addr_page_top & 0x10000 ){ // addr > 0xffff then P0 sets 1
kenjiArai 0:b9f5cf0309af 92 tmp_addr += 0x02; // P0=1
kenjiArai 0:b9f5cf0309af 93 }
kenjiArai 0:b9f5cf0309af 94 dt[0] = ( uint8_t )( (addr_page_top & 0xff00) >> 8 );
kenjiArai 0:b9f5cf0309af 95 dt[1] = 0;
kenjiArai 0:b9f5cf0309af 96 i2c_write_n_bytes((int)tmp_addr, (char *)dt, 256 + 2);
kenjiArai 0:b9f5cf0309af 97 return AT24C_OK;
kenjiArai 0:b9f5cf0309af 98 } else {
kenjiArai 0:b9f5cf0309af 99 return AT24C_WRONG_TOP_ADDR;
kenjiArai 0:b9f5cf0309af 100 }
kenjiArai 0:b9f5cf0309af 101 } else {
kenjiArai 0:b9f5cf0309af 102 return AT24C_WRONG_BF_SIZE;
kenjiArai 0:b9f5cf0309af 103 }
kenjiArai 0:b9f5cf0309af 104 }
kenjiArai 0:b9f5cf0309af 105
kenjiArai 0:b9f5cf0309af 106 void AT24C1024::i2c_read_n_bytes (int addr, char *dt, int n) {
kenjiArai 0:b9f5cf0309af 107 i2c.read(addr, dt, n);
kenjiArai 0:b9f5cf0309af 108 }
kenjiArai 0:b9f5cf0309af 109
kenjiArai 0:b9f5cf0309af 110 void AT24C1024::i2c_write_n_bytes (int addr, char *dt, int n) {
kenjiArai 0:b9f5cf0309af 111 i2c.write(addr, dt, n);
kenjiArai 0:b9f5cf0309af 112 }