Example program for Microchip 47x04 and 47x16 EERAM devices.
eeram_main.cpp
- Committer:
- vargham
- Date:
- 2017-04-27
- Revision:
- 2:e7a7a5328184
- Parent:
- 0:f7121193ff7e
- Child:
- 3:9b5473254d82
File content as of revision 2:e7a7a5328184:
/** * @file eeram_main.cpp * @brief Example program for Microchip I2C EERAM devices (47x04 and 47x16) * @author Mark Peter Vargha, vmp@varghamarkpeter.hu * @version 1.0.0 * * Copyright (c) 2017 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbed.h" #include "EERAM.h" #define PIN_I2C_SDA PC_9 #define PIN_I2C_SCL PA_8 #define I2C_FREQUENCY 1000000 Serial serial(PA_9, PA_10); //Tx, Rx I2C i2c(PIN_I2C_SDA, PIN_I2C_SCL); //SDA, SCL EERAM eeram(i2c, 2048); void printI2C() { //0x41 Discovery Touch //0x18 EERAM control //0x50 EERAM memory int error; int address; int nDevices = 0; serial.printf("Scanning I2C devices...\r\n"); for(address = 1; address < 127; address++ ) { i2c.start(); error = i2c.write(address << 1); //We shift it left because mbed takes in 8 bit addreses i2c.stop(); if (error == 1) { serial.printf("I2C device found at address 0x%X\r\n", address); //Returns 7-bit addres nDevices++; } } serial.printf("I2C scan finished.\r\n"); if (nDevices == 0) { serial.printf("No I2C devices found.\r\n"); } } void fillTestData(char data[], uint8_t start, int length) { for (int i = 0; i < length; i++) data[i] = start + i; } void eeramDataTest() { const int testDataLength = 16; char data[testDataLength]; //Write //eeram.fillMemory(0xFF); fillTestData(data, 0x0, testDataLength); serial.printf("Write %d bytes to 0x0: %d\r\n", testDataLength, eeram.write(0x0, data, testDataLength)); fillTestData(data, 0x50, testDataLength); serial.printf("Write %d bytes to 0x500: %d\r\n", testDataLength, eeram.write(0x500, data, testDataLength)); fillTestData(data, 0x70, testDataLength); serial.printf("Write %d bytes to 0x700: %d\r\n", testDataLength, eeram.write(0x700, data, testDataLength)); //Dump serial.printf("Dump contents 0x0, 16\r\n"); eeram.dump(serial, 0x0, testDataLength); serial.printf("Dump contents 0x500, 16\r\n"); eeram.dump(serial, 0x500, testDataLength); serial.printf("Dump contents 0x700, 16\r\n"); eeram.dump(serial, 0x700, testDataLength); //serial.printf("Dump all\r\n"); //eeram.dump(serial); serial.printf("Dump done\r\n"); //Read back fillTestData(data, 0x0, testDataLength); serial.printf("Read back 16 bytes from 0x500: %d\r\n", eeram.read(0x500, data, testDataLength)); serial.printf("%.4X ", 0x500); for (int i = 0; i < testDataLength; i++) { serial.printf("%.2X ", data[i]); } serial.printf("\r\n"); //Read and write individual values const uint16_t START_ADDRESS = 0x400; uint16_t addressPtr = START_ADDRESS; int intToWrite = -76324; unsigned short ushortToWrite = 4395; float floatToWrite = 0.1976f; serial.printf("# # #\r\n"); serial.printf("Write individual values, start address = 0x%X\r\n", START_ADDRESS); serial.printf("Int to write: %d\r\n", intToWrite); serial.printf("Unsigned short to write: %d\r\n", ushortToWrite); serial.printf("Float to write: %f\r\n", floatToWrite); addressPtr += eeram.writeValue(addressPtr, &intToWrite); addressPtr += eeram.writeValue(addressPtr, &ushortToWrite); addressPtr += eeram.writeValue(addressPtr, &floatToWrite); addressPtr = START_ADDRESS; int intToRead = 0; unsigned short ushortToRead = 0; float floatToRead = 0.0; addressPtr += eeram.readValue(addressPtr, &intToRead); addressPtr += eeram.readValue(addressPtr, &ushortToRead); addressPtr += eeram.readValue(addressPtr, &floatToRead); serial.printf("Read back individual values\r\n"); serial.printf("Int to read: %d\r\n", intToRead); serial.printf("Unsigned short to read: %d\r\n", ushortToRead); serial.printf("Float to read: %f\r\n", floatToRead); int length = addressPtr - START_ADDRESS + 6; serial.printf("Dump %d bytes from 0x%X:\r\n", length, START_ADDRESS); eeram.dump(serial, START_ADDRESS, length); } void eeramRegisterTest() { serial.printf("# # #\r\n"); eeram.dumpRegisters(serial); } int main() { serial.baud(460800); i2c.frequency(I2C_FREQUENCY); //Hz serial.printf("\r\nI2C EERAM example\r\n"); //printI2C(); serial.printf("Is EERAM device ready?\r\n"); while (!eeram.isReady()); serial.printf("Device is ready.\r\n"); eeram.readStatus(); eeram.setAutoStoreEnabled(true); eeram.setProtectedMemoryArea(U64); eeram.writeStatusIfChanged(true); serial.printf("Status: %.2X\r\n", eeram.getStatus()); eeramDataTest(); eeramRegisterTest(); //eeram.store(true); //eeram.recall(true); while (true) { } } /* #include "mbed.h" #include "EERAM.h" EERAM eeram(PC_9, PA_8, 2048); //SDA, SCL int main() { if (!eeram.isReady(100)) //Checks device with 100 ms timeout { printf("Device is not present."); while (1); } eeram.readStatus(); //Reads status register eeram.setAutoStoreEnabled(true, true); //Set auto store on power down to true and stores if not stored before while (1) { char dataStore[16] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; eeram.write(0x100, dataStore, 16); //We can not wear EEPROM out, so it is ok to write data to the device frequently. wait(2.0); char dataRead[16]; eeram.read(0x100, dataRead, 16); wait(2.0); float floatToWrite = -1.976f; const uint16_t address = 0x200; eeram.writeValue(address, &floatToWrite); wait(2.0); float floatToRead = 0; eeram.readValue(address, &floatToWrite); wait(2.0); } } */