Poushen Ou / eeprom

a simple wrapper above I2C to provider EEPROM access API

Dependents:   ou_mbed_oled ou_mbed_eeprom ou_mbed_tmp102

eeprom.cpp@0:3de36cc169a3, 2018-06-15 (annotated)

Committer:
poushen
Date:
Fri Jun 15 13:02:30 2018 +0000
Revision:
0:3de36cc169a3
Child:
1:0c876c06b026
add eeprom class

Who changed what in which revision?

UserRevisionLine numberNew contents of line
poushen 0:3de36cc169a3 1 #include "eeprom.h"
poushen 0:3de36cc169a3 2
poushen 0:3de36cc169a3 3 eeprom::eeprom(I2C &i2c_obj, char address)
poushen 0:3de36cc169a3 4 : i2c(i2c_obj), adr(address)
poushen 0:3de36cc169a3 5 {
poushen 0:3de36cc169a3 6 init();
poushen 0:3de36cc169a3 7 }
poushen 0:3de36cc169a3 8
poushen 0:3de36cc169a3 9 void eeprom::init(void)
poushen 0:3de36cc169a3 10 {
poushen 0:3de36cc169a3 11 }
poushen 0:3de36cc169a3 12
poushen 0:3de36cc169a3 13 void eeprom::write_address(int address, int address_size, bool repeated)
poushen 0:3de36cc169a3 14 { /*
poushen 0:3de36cc169a3 15 uint8_t mem_address[] = {0, 0, 0};
poushen 0:3de36cc169a3 16
poushen 0:3de36cc169a3 17 switch (address_size) {
poushen 0:3de36cc169a3 18 case ONE_BYTE_ADDRESS:
poushen 0:3de36cc169a3 19 mem_address[0] = address & 0xFF;
poushen 0:3de36cc169a3 20 break;
poushen 0:3de36cc169a3 21 case TWO_BYTES_ADDRESS:
poushen 0:3de36cc169a3 22 mem_address[0] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 23 mem_address[1] = address & 0xFF;
poushen 0:3de36cc169a3 24 break;
poushen 0:3de36cc169a3 25 case THREE_BYTES_ADDRESS:
poushen 0:3de36cc169a3 26 mem_address[0] = (address >> 16) & 0xFF;
poushen 0:3de36cc169a3 27 mem_address[1] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 28 mem_address[2] = address & 0xFF;
poushen 0:3de36cc169a3 29 break;
poushen 0:3de36cc169a3 30 }
poushen 0:3de36cc169a3 31 i2c.write((int)adr,(char *)mem_address,address_size,repeated);
poushen 0:3de36cc169a3 32 */
poushen 0:3de36cc169a3 33 uint8_t buffer[4] = { 0, 0, 0, 0 };
poushen 0:3de36cc169a3 34 page_write(address, address_size, buffer, 0);
poushen 0:3de36cc169a3 35 }
poushen 0:3de36cc169a3 36
poushen 0:3de36cc169a3 37 void eeprom::current_read(uint8_t *data)
poushen 0:3de36cc169a3 38 {
poushen 0:3de36cc169a3 39 i2c.read((int)adr,(char *)data,1);
poushen 0:3de36cc169a3 40 }
poushen 0:3de36cc169a3 41
poushen 0:3de36cc169a3 42 void eeprom::sequential_read(uint8_t *buffer, int buffer_size)
poushen 0:3de36cc169a3 43 {
poushen 0:3de36cc169a3 44 i2c.read((int)adr, (char *)buffer, buffer_size);
poushen 0:3de36cc169a3 45 }
poushen 0:3de36cc169a3 46
poushen 0:3de36cc169a3 47 void eeprom::random_read(int address, int address_size, uint8_t *buffer, int buffer_size)
poushen 0:3de36cc169a3 48 {
poushen 0:3de36cc169a3 49 write_address(address, address_size, true);
poushen 0:3de36cc169a3 50 i2c.read((int)adr, (char *)buffer, buffer_size);
poushen 0:3de36cc169a3 51 }
poushen 0:3de36cc169a3 52
poushen 0:3de36cc169a3 53 void eeprom::byte_write(int address, int address_size, uint8_t data, bool repeated)
poushen 0:3de36cc169a3 54 { /*
poushen 0:3de36cc169a3 55 uint8_t mem_address[] = {0, 0, 0, 0};
poushen 0:3de36cc169a3 56 mem_address[3] = data;
poushen 0:3de36cc169a3 57
poushen 0:3de36cc169a3 58 switch (address_size) {
poushen 0:3de36cc169a3 59 case ONE_BYTE_ADDRESS:
poushen 0:3de36cc169a3 60 mem_address[2] = address & 0xFF;
poushen 0:3de36cc169a3 61 break;
poushen 0:3de36cc169a3 62 case TWO_BYTES_ADDRESS:
poushen 0:3de36cc169a3 63 mem_address[1] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 64 mem_address[2] = address & 0xFF;
poushen 0:3de36cc169a3 65 break;
poushen 0:3de36cc169a3 66 case THREE_BYTES_ADDRESS:
poushen 0:3de36cc169a3 67 mem_address[0] = (address >> 16) & 0xFF;
poushen 0:3de36cc169a3 68 mem_address[1] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 69 mem_address[2] = address & 0xFF;
poushen 0:3de36cc169a3 70 break;
poushen 0:3de36cc169a3 71 }
poushen 0:3de36cc169a3 72 i2c.write((int)adr,(char *)(mem_address + (3 - address_size)),address_size+1,repeated);
poushen 0:3de36cc169a3 73 */
poushen 0:3de36cc169a3 74 uint8_t buffer[4] = { 0, 0, 0, 0 };
poushen 0:3de36cc169a3 75 buffer[3] = data;
poushen 0:3de36cc169a3 76 page_write(address, address_size, buffer, 1);
poushen 0:3de36cc169a3 77 }
poushen 0:3de36cc169a3 78
poushen 0:3de36cc169a3 79 void eeprom::page_write(int address, int address_size, uint8_t *buffer, int buffer_size, bool repeated)
poushen 0:3de36cc169a3 80 {
poushen 0:3de36cc169a3 81 // for simplify, buffer must prefix 3 bytes for memory address
poushen 0:3de36cc169a3 82 switch (address_size) {
poushen 0:3de36cc169a3 83 case ONE_BYTE_ADDRESS:
poushen 0:3de36cc169a3 84 buffer[2] = address & 0xFF;
poushen 0:3de36cc169a3 85 break;
poushen 0:3de36cc169a3 86 case TWO_BYTES_ADDRESS:
poushen 0:3de36cc169a3 87 buffer[1] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 88 buffer[2] = address & 0xFF;
poushen 0:3de36cc169a3 89 break;
poushen 0:3de36cc169a3 90 case THREE_BYTES_ADDRESS:
poushen 0:3de36cc169a3 91 buffer[0] = (address >> 16) & 0xFF;
poushen 0:3de36cc169a3 92 buffer[1] = (address >> 8) & 0xFF;
poushen 0:3de36cc169a3 93 buffer[2] = address & 0xFF;
poushen 0:3de36cc169a3 94 break;
poushen 0:3de36cc169a3 95 }
poushen 0:3de36cc169a3 96 i2c.write((int)adr,(char *)(buffer + (3 - address_size)),address_size + buffer_size,repeated);
poushen 0:3de36cc169a3 97 }
poushen 0:3de36cc169a3 98
poushen 0:3de36cc169a3 99 void eeprom::ack_polling(void)
poushen 0:3de36cc169a3 100 {
poushen 0:3de36cc169a3 101 uint8_t buffer[] = { 0 };
poushen 0:3de36cc169a3 102 int ack;
poushen 0:3de36cc169a3 103
poushen 0:3de36cc169a3 104 do {
poushen 0:3de36cc169a3 105 ack = i2c.write((int)adr, (char *)buffer, 1);
poushen 0:3de36cc169a3 106 } while(ack == 1);
poushen 0:3de36cc169a3 107 }
poushen 0:3de36cc169a3 108
poushen 0:3de36cc169a3 109