// -*-c++-*- // Sketch to explore 24AA1024 using SoftI2C #define SDA_PORT PORTC #define SDA_PIN 4 #define SCL_PORT PORTC #define SCL_PIN 5 //#define I2C_SLOWMODE 1 //#define I2C_FASTMODE 1 //#define I2C_TIMEOUT 10 // timeout after 10 msec //#define I1C_NOINTERRUPT 1 // no interrupts //#define I2C_CPUFREQ (F_CPU/8) // slow down CPU frequency #include #define EEPROMADDR 0xA6 // set by jumper (A0 and A1 = High) #define MAXADDR 0x1FFFF #define MAXTESTADDR 0x007FF void CPUSlowDown(void) { // slow down processor by a factor of 8 CLKPR = _BV(CLKPCE); CLKPR = _BV(CLKPS1) | _BV(CLKPS0); } //------------------------------------------------------------------------------ /* * read one byte from address */ boolean readEEPROM(unsigned long address, uint8_t *byte) { // issue a start condition, send device address and write direction bit if (!i2c_start(EEPROMADDR | I2C_WRITE | (address&0x10000 ? 8 : 0) )) return false; // send the address if (!i2c_write((address>>8)&0xFF)) return false; if (!i2c_write(address&0xFF)) return false; // issue a repeated start condition, send device address and read direction bit if (!i2c_rep_start(EEPROMADDR | I2C_READ | (address&0x10000 ? 8 : 0) ))return false; *byte = i2c_read(true); i2c_stop(); return true; } //------------------------------------------------------------------------------ /* *burst read */ boolean readBurstEEPROM(unsigned long start, unsigned long stop) { // does not handle the transition from 0x0FFFF to 0x10000 // since we only use it for performance evaluation, we do not care! unsigned long addr = start; uint8_t byte; // issue a start condition, send device address and write direction bit if (!i2c_start(EEPROMADDR | I2C_WRITE | (addr&0x10000 ? 8 : 0) )) return false; // send the address if (!i2c_write((addr>>8)&0xFF)) return false; if (!i2c_write(addr&0xFF)) return false; // issue a repeated start condition, send device address and read direction bit if (!i2c_rep_start(EEPROMADDR | I2C_READ | (addr&0x10000 ? 8 : 0) ))return false; addr++; while (addr++ < stop) byte = i2c_read(false); byte = i2c_read(true); i2c_stop(); return true; } //------------------------------------------------------------------------------ /* * write 1 byte to 'address' in eeprom */ boolean writeEEPROM(long unsigned address, uint8_t byte) { // issue a start condition, send device address and write direction bit if (!i2c_start(EEPROMADDR | I2C_WRITE | (address&0x10000 ? 8 : 0))) return false; // send the address if (!i2c_write((address>>8)&0xFF)) return false; if (!i2c_write(address&0xFF)) return false; // send data to EEPROM if (!i2c_write(byte)) return false; // issue a stop condition i2c_stop(); delay(6); return true; } //------------------------------------------------------------------------------ /* * delete eeprom */ boolean deleteEEPROM(long unsigned from, unsigned long to, uint8_t byte, boolean poll) { unsigned long tempto, i; boolean firstpage = true; while (from <= to) { tempto = ((from/128)+1)*128-1; if (tempto > to) tempto = to; if (firstpage || !poll) { if (!i2c_start(EEPROMADDR | I2C_WRITE | (from&0x10000 ? 8 : 0))) return false; } else i2c_start_wait(EEPROMADDR | I2C_WRITE | (from&0x10000 ? 8 : 0)); // send the address if (!i2c_write((from>>8)&0xFF)) return false; if (!i2c_write(from&0xFF)) return false; // send data to EEPROM for (i=from; i<=tempto; i++) if (!i2c_write(byte)) return false; // issue a stop condition i2c_stop(); // wait for ack again if (!poll) delay(6); from = tempto+1; firstpage = false; } return true; } //------------------------------------------------------------------------------ boolean performanceTest() { unsigned long eeaddr; unsigned long startmicros, endmicros; int avgtime; boolean OK = true; uint8_t byte; Serial.println(F("\nPerformance test:")); Serial.println(F("Sequential reads ...")); startmicros = micros(); OK &= readBurstEEPROM(0,MAXTESTADDR); endmicros = micros(); Serial.print(F("Time: ")); avgtime = (endmicros-startmicros)/(MAXTESTADDR+1); Serial.print(avgtime); Serial.println(F(" micro secs/byte")); Serial.println(F("Random reads ...")); startmicros = micros(); for (eeaddr = 0; eeaddr <= MAXTESTADDR; eeaddr++) OK &= readEEPROM(eeaddr,&byte); endmicros = micros(); Serial.print(F("Time: ")); avgtime = (endmicros-startmicros)/(MAXTESTADDR+1); Serial.print(avgtime); Serial.println(F(" micro secs/byte")); Serial.println(F("Random writes ...")); startmicros = micros(); for (eeaddr = 0; eeaddr <= MAXTESTADDR; eeaddr++) OK &= writeEEPROM(eeaddr,0x55); endmicros = micros(); Serial.print(F("Time: ")); avgtime = (endmicros-startmicros)/(MAXTESTADDR+1); Serial.print(avgtime); Serial.println(F(" micro secs/byte")); Serial.println(F("Page writes with wait ...")); startmicros = micros(); OK &= deleteEEPROM(0,MAXTESTADDR,0xFF,false); endmicros = micros(); Serial.print(F("Time: ")); avgtime = (endmicros-startmicros)/(MAXTESTADDR+1); Serial.print(avgtime); Serial.println(F(" micro secs/byte")); Serial.println(F("Page writes with poll ...")); startmicros = micros(); OK &= deleteEEPROM(0,MAXTESTADDR,0xFF,true); endmicros = micros(); Serial.print(F("Time: ")); avgtime = (endmicros-startmicros)/(MAXTESTADDR+1); Serial.print(avgtime); Serial.println(F(" micro secs/byte")); return OK; } //------------------------------------------------------------------------------ unsigned long parseHex() { unsigned long result = 0L; char byte = '\0'; // while (hexdigit(byte)) { while (byte != '\r' && byte != '#') { while (!Serial.available()); byte = Serial.read(); // if (!hexdigit(byte)) break; if (byte == '\r' || byte == '#') break; if (byte >= 'a' && byte <= 'f') byte = byte -'a' + 'A'; if ((byte >= '0' && byte <= '9') || (byte >= 'A' && byte <= 'F')) { Serial.print(byte); if (byte >= '0' && byte <= '9') byte = byte - '0'; else byte = byte - 'A' + 10; result = result * 16; result = result + byte; } } Serial.println(); return result; } void help (void) { Serial.println(); Serial.println(F("r - read byte from address")); Serial.println(F("w - write byte to address")); Serial.println(F("d - delete from start address to end address")); Serial.println(F("l - list memory range")); Serial.println(F("p - test performance")); Serial.println(F("h - help message")); Serial.println(F("Finish all numeric inputs with '#'")); } //------------------------------------------------------------------------------ void setup(void) { #if I2C_CPUFREQ == (F_CPU/8) CPUSlowDown(); Serial.begin(38400); #else Serial.begin(115200); #endif Serial.println(F("\n\nTest program for EEPROM 24AA1025 (SoftI2CMaster)")); help(); } void loop(void) { char cmd; uint8_t byte; boolean noterror; unsigned long addr, toaddr; while (!Serial.available()); cmd = Serial.read(); switch (cmd) { case 'r': Serial.print(F("Read from addr: ")); addr = parseHex(); Serial.println(F("Reading...")); noterror = readEEPROM(addr,&byte); Serial.print(addr,HEX); Serial.print(F(": ")); if (byte < 0x10) Serial.print("0"); Serial.println(byte,HEX); if (!noterror) Serial.println(F("Error while reading")); break; case 'w': Serial.print(F("Write to addr: ")); addr = parseHex(); Serial.print(F("Value: ")); byte = parseHex(); Serial.println(F("Writing...")); noterror = writeEEPROM(addr,byte); if (!noterror) Serial.println(F("Error while reading")); break; case 'd': Serial.print(F("Delete from addr: ")); addr = parseHex(); Serial.print(F("to addr: ")); toaddr = parseHex(); Serial.print(F("Value: ")); byte = parseHex(); Serial.print(F("Deleting ... ")); noterror = deleteEEPROM(addr,toaddr,byte,false); Serial.println(F("...done")); if (!noterror) Serial.println(F("Error while deleting")); break; case 'l': Serial.print(F("List from addr: ")); addr = parseHex(); Serial.print(F("to addr: ")); toaddr = parseHex(); while (addr <= toaddr) { noterror = readEEPROM(addr,&byte); Serial.print(addr,HEX); Serial.print(F(": ")); if (byte < 0x10) Serial.print("0"); Serial.println(byte,HEX); if (!noterror) Serial.println(F("Error while reading")); addr++; } break; case 'p': noterror = performanceTest(); if (!noterror) Serial.println(F("Error while executing performance test")); break; case 'h': help(); break; case '\r': case '\n': case ' ': break; default: Serial.println(F("Unknown command")); Serial.println(); help(); } }