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93Cx6.c
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93Cx6.c
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/*
93Cx6.c - Library for the Three-wire Serial EEPROM chip
*/
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <wiringPi.h>
#include "93Cx6.h"
#define DELAY_CS 0
#define DELAY_READ 1
#define DELAY_WRITE 1
#define DELAY_WAIT 1
#define _DEBUG_ 0
enum OP { // Operations
CONTROL = 0x00,
WRITE = 0x01,
READ = 0x02,
ERASE = 0x03
};
enum CC { // Control Codes
EW_DISABLE = 0x00,
WRITE_ALL = 0x01,
ERASE_ALL = 0x02,
EW_ENABLE = 0x03
};
// Open Memory Device
// model:EEPROM model(46/56/66/76/86)
// org:Organization Select(1=8Bit/2=16Bit)
int eeprom_open(int model, int org, int pCS, int pSK, int pDI, int pDO, struct eeprom * dev)
{
pinMode(pCS, OUTPUT); // ChipSelect
pinMode(pSK, OUTPUT); // Clock
pinMode(pDI, OUTPUT); // MOSI
pinMode(pDO, INPUT); // MISO
digitalWrite(dev->_pCS, LOW);
dev->_pCS = pCS;
dev->_pSK = pSK;
dev->_pDI = pDI;
dev->_pDO = pDO;
dev->_ew = false;
dev->_org = org;
dev->_model = model;
dev->_bytes = getBytesByModel(dev->_org, dev->_model);
dev->_addr = getAddrByModel(dev->_org, dev->_model);
dev->_mask = getMaskByModel(dev->_org, dev->_model);
if(_DEBUG_) printf("dev->_bytes=%d dev->_addr=%d dev->_mask=%x\n", dev->_bytes, dev->_addr, dev->_mask);
return dev->_bytes;
};
// Erase/Write Enable
// Required Clock Cycle : 9-13
void eeprom_ew_enable(struct eeprom *dev)
{
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
//uint16_t value = CONTROL<<dev->_addr | EW_ENABLE<<(dev->_addr-2);
//printf("eeprom_ew_enable value=%04x\n", value);
send_bits(dev, CONTROL<<dev->_addr | EW_ENABLE<<(dev->_addr-2), dev->_addr + 2);
digitalWrite(dev->_pCS, LOW);
dev->_ew = true;
};
// Erase/Write Disable
// Required Clock Cycle : 9-13
void eeprom_ew_disable(struct eeprom *dev)
{
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
send_bits(dev, CONTROL<<dev->_addr | EW_DISABLE<<(dev->_addr-2), dev->_addr + 2);
digitalWrite(dev->_pCS, LOW);
dev->_ew = false;
}
// Check Erase/Write Enable
bool eeprom_is_ew_enabled(struct eeprom *dev)
{
return dev->_ew;
}
// Erase All Memory
// Required Clock Cycle : 9-13
void eeprom_erase_all(struct eeprom *dev)
{
if(!eeprom_is_ew_enabled(dev)) return;
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
//uint16_t value = CONTROL<<dev->_addr | ERASE_ALL<<(dev->_addr-2);
//printf("eeprom_erase_all value=%04x\n", value);
send_bits(dev, CONTROL<<dev->_addr | ERASE_ALL<<(dev->_addr-2), dev->_addr + 2);
digitalWrite(dev->_pCS, LOW);
wait_ready(dev);
}
// Erase Byte or Word
// Required Clock Cycle : 9-13
void eeprom_erase(struct eeprom *dev, uint16_t addr)
{
if(!eeprom_is_ew_enabled(dev)) return;
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
if(dev->_org == EEPROM_MODE_16BIT) {
send_bits(dev, ERASE<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
} else {
send_bits(dev, ERASE<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
}
digitalWrite(dev->_pCS, LOW);
wait_ready(dev);
}
// Write All Memory with same Data
// Required Clock Cycle : 25-29
void eeprom_write_all(struct eeprom *dev, uint16_t value)
{
if(!eeprom_is_ew_enabled(dev)) return;
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
send_bits(dev, CONTROL<<dev->_addr | WRITE_ALL<<(dev->_addr-2), dev->_addr + 2);
if(dev->_org == EEPROM_MODE_16BIT) {
send_bits(dev, 0xFFFF & value, 16);
} else {
send_bits(dev, 0xFF & value, 8);
}
digitalWrite(dev->_pCS, LOW);
wait_ready(dev);
}
// Write Data to Memory
// Required Clock Cycle : 25-29
void eeprom_write(struct eeprom *dev, uint16_t addr, uint16_t value)
{
if(!eeprom_is_ew_enabled(dev)) return;
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1);
if(dev->_org == EEPROM_MODE_16BIT) {
send_bits(dev, WRITE<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
send_bits(dev, 0xFFFF & value, 16);
} else {
send_bits(dev, WRITE<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
send_bits(dev, 0xFF & value, 8);
}
digitalWrite(dev->_pCS, LOW);
wait_ready(dev);
}
// Read Data from Memory
uint16_t eeprom_read(struct eeprom *dev, uint16_t addr)
{
uint16_t val = 0;
digitalWrite(dev->_pCS, HIGH);
usleep(DELAY_CS);
send_bits(dev, HIGH, 1); // Start bit
int amtBits;
if(dev->_org == EEPROM_MODE_16BIT) {
send_bits(dev, READ<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
amtBits = 16;
} else {
send_bits(dev, READ<<dev->_addr | (addr & dev->_mask), dev->_addr + 2);
amtBits = 8;
}
// Read bits
for(int i = amtBits; i>0; i--) {
digitalWrite(dev->_pSK, HIGH);
usleep(DELAY_READ);
int in = digitalRead(dev->_pDO) ? 1 : 0;
digitalWrite(dev->_pSK, LOW);
usleep(DELAY_READ);
val |= (in << (i-1));
}
digitalWrite(dev->_pCS, LOW);
return val;
}
static void send_bits(struct eeprom *dev, uint16_t value, int len)
{
if(_DEBUG_) printf("send_bits value=0x%04x len=%d\n",value, len);
for(int i = len-1; i>=0; i--)
{
bool toSend = (value & 1<<i);
// Send bit
if (toSend) digitalWrite(dev->_pDI, HIGH);
if (!toSend) digitalWrite(dev->_pDI, LOW);
usleep(DELAY_WRITE);
digitalWrite(dev->_pSK, HIGH);
usleep(DELAY_WRITE);
digitalWrite(dev->_pSK, LOW);
usleep(DELAY_WRITE);
}
}
static void wait_ready(struct eeprom *dev)
{
//Wait until action is done.
digitalWrite(dev->_pCS, HIGH);
while(digitalRead(dev->_pDO) != HIGH) {
usleep(DELAY_WAIT);
}
digitalWrite(dev->_pCS, LOW);
}
static int getBytesByModel(int org, int model)
{
int byte = 0;
if (org == EEPROM_MODE_8BIT) byte = 128;
if (org == EEPROM_MODE_16BIT) byte = 64;
if (model == 56) byte = byte * 2; // 256/128
if (model == 66) byte = byte * 4; // 512/256
if (model == 76) byte = byte * 8; // 1024/256
if (model == 86) byte = byte * 16; // 2048/1024
return byte;
}
static int getAddrByModel(int org, int model)
{
int addr = 0;
if (org == EEPROM_MODE_8BIT) addr = 7;
if (org == EEPROM_MODE_16BIT) addr = 6;
if (model == 56) addr = addr + 2; // 9/8
if (model == 66) addr = addr + 2; // 9/8
if (model == 76) addr = addr + 4; // 11/10
if (model == 86) addr = addr + 4; // 11/10
return addr;
}
static uint16_t getMaskByModel(int org, int model)
{
uint16_t mask = 0;
if (org == EEPROM_MODE_8BIT) mask = 0x7f;
if (org == EEPROM_MODE_16BIT) mask = 0x3f;
if (model == 56) mask = (mask<<2) + 0x03; // 0x1ff/0xff
if (model == 66) mask = (mask<<2) + 0x03; // 0x1ff/0xff
if (model == 76) mask = (mask<<4) + 0x0f; // 0x7ff/0x3ff
if (model == 86) mask = (mask<<4) + 0x0f; // 0x7ff/0x3ff
return mask;
}