Driver library for Microchip I2C EERAM (47x04 and 47x16) 4 kbit or 16 kbit EEPROM backed SRAM.
EERAM.cpp@0:19f9af07424a, 2017-04-25 (annotated)
- Committer:
- vargham
- Date:
- Tue Apr 25 15:05:37 2017 +0000
- Revision:
- 0:19f9af07424a
- Child:
- 1:6028bc22d82f
EERAM initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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vargham | 0:19f9af07424a | 1 | /** |
vargham | 0:19f9af07424a | 2 | * @file eeram_main.cpp |
vargham | 0:19f9af07424a | 3 | * @brief Example program for Microchip I2C EERAM devices (47x04 and 47x16) |
vargham | 0:19f9af07424a | 4 | * @author Mark Peter Vargha, vmp@varghamarkpeter.hu |
vargham | 0:19f9af07424a | 5 | * @version 1.0.0 |
vargham | 0:19f9af07424a | 6 | * |
vargham | 0:19f9af07424a | 7 | * Copyright (c) 2017 |
vargham | 0:19f9af07424a | 8 | * |
vargham | 0:19f9af07424a | 9 | * Licensed under the Apache License, Version 2.0 (the "License"); |
vargham | 0:19f9af07424a | 10 | * you may not use this file except in compliance with the License. |
vargham | 0:19f9af07424a | 11 | * You may obtain a copy of the License at |
vargham | 0:19f9af07424a | 12 | * |
vargham | 0:19f9af07424a | 13 | * http://www.apache.org/licenses/LICENSE-2.0 |
vargham | 0:19f9af07424a | 14 | * |
vargham | 0:19f9af07424a | 15 | * Unless required by applicable law or agreed to in writing, software |
vargham | 0:19f9af07424a | 16 | * distributed under the License is distributed on an "AS IS" BASIS, |
vargham | 0:19f9af07424a | 17 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
vargham | 0:19f9af07424a | 18 | * See the License for the specific language governing permissions and |
vargham | 0:19f9af07424a | 19 | * limitations under the License. |
vargham | 0:19f9af07424a | 20 | */ |
vargham | 0:19f9af07424a | 21 | |
vargham | 0:19f9af07424a | 22 | #include "mbed.h" |
vargham | 0:19f9af07424a | 23 | #include "EERAM.h" |
vargham | 0:19f9af07424a | 24 | |
vargham | 0:19f9af07424a | 25 | #define PIN_I2C_SDA PC_9 |
vargham | 0:19f9af07424a | 26 | #define PIN_I2C_SCL PA_8 |
vargham | 0:19f9af07424a | 27 | |
vargham | 0:19f9af07424a | 28 | #define I2C_FREQUENCY 1000000 |
vargham | 0:19f9af07424a | 29 | |
vargham | 0:19f9af07424a | 30 | Serial serial(PA_9, PA_10); //Tx, Rx |
vargham | 0:19f9af07424a | 31 | I2C i2c(PIN_I2C_SDA, PIN_I2C_SCL); //SDA, SCL |
vargham | 0:19f9af07424a | 32 | EERAM eeram(i2c, 2048); |
vargham | 0:19f9af07424a | 33 | |
vargham | 0:19f9af07424a | 34 | void printI2C() |
vargham | 0:19f9af07424a | 35 | { |
vargham | 0:19f9af07424a | 36 | //0x41 Discovery Touch |
vargham | 0:19f9af07424a | 37 | //0x18 EERAM control |
vargham | 0:19f9af07424a | 38 | //0x50 EERAM memory |
vargham | 0:19f9af07424a | 39 | |
vargham | 0:19f9af07424a | 40 | int error; |
vargham | 0:19f9af07424a | 41 | int address; |
vargham | 0:19f9af07424a | 42 | int nDevices = 0; |
vargham | 0:19f9af07424a | 43 | |
vargham | 0:19f9af07424a | 44 | serial.printf("Scanning I2C devices...\r\n"); |
vargham | 0:19f9af07424a | 45 | |
vargham | 0:19f9af07424a | 46 | for(address = 1; address < 127; address++ ) |
vargham | 0:19f9af07424a | 47 | { |
vargham | 0:19f9af07424a | 48 | i2c.start(); |
vargham | 0:19f9af07424a | 49 | error = i2c.write(address << 1); //We shift it left because mbed takes in 8 bit addreses |
vargham | 0:19f9af07424a | 50 | i2c.stop(); |
vargham | 0:19f9af07424a | 51 | if (error == 1) |
vargham | 0:19f9af07424a | 52 | { |
vargham | 0:19f9af07424a | 53 | serial.printf("I2C device found at address 0x%X\r\n", address); //Returns 7-bit addres |
vargham | 0:19f9af07424a | 54 | nDevices++; |
vargham | 0:19f9af07424a | 55 | } |
vargham | 0:19f9af07424a | 56 | |
vargham | 0:19f9af07424a | 57 | } |
vargham | 0:19f9af07424a | 58 | serial.printf("I2C scan finished.\r\n"); |
vargham | 0:19f9af07424a | 59 | if (nDevices == 0) |
vargham | 0:19f9af07424a | 60 | { |
vargham | 0:19f9af07424a | 61 | serial.printf("No I2C devices found.\r\n"); |
vargham | 0:19f9af07424a | 62 | } |
vargham | 0:19f9af07424a | 63 | |
vargham | 0:19f9af07424a | 64 | } |
vargham | 0:19f9af07424a | 65 | |
vargham | 0:19f9af07424a | 66 | void fillTestData(char data[], uint8_t start, int length) |
vargham | 0:19f9af07424a | 67 | { |
vargham | 0:19f9af07424a | 68 | for (int i = 0; i < length; i++) data[i] = start + i; |
vargham | 0:19f9af07424a | 69 | } |
vargham | 0:19f9af07424a | 70 | |
vargham | 0:19f9af07424a | 71 | void eeramDataTest() |
vargham | 0:19f9af07424a | 72 | { |
vargham | 0:19f9af07424a | 73 | const int testDataLength = 16; |
vargham | 0:19f9af07424a | 74 | char data[testDataLength]; |
vargham | 0:19f9af07424a | 75 | |
vargham | 0:19f9af07424a | 76 | //Write |
vargham | 0:19f9af07424a | 77 | //eeram.fillMemory(0xFF); |
vargham | 0:19f9af07424a | 78 | |
vargham | 0:19f9af07424a | 79 | fillTestData(data, 0x0, testDataLength); |
vargham | 0:19f9af07424a | 80 | serial.printf("Write %d bytes to 0x0: %d\r\n", testDataLength, eeram.write(0x0, data, testDataLength)); |
vargham | 0:19f9af07424a | 81 | |
vargham | 0:19f9af07424a | 82 | fillTestData(data, 0x50, testDataLength); |
vargham | 0:19f9af07424a | 83 | serial.printf("Write %d bytes to 0x500: %d\r\n", testDataLength, eeram.write(0x500, data, testDataLength)); |
vargham | 0:19f9af07424a | 84 | |
vargham | 0:19f9af07424a | 85 | fillTestData(data, 0x70, testDataLength); |
vargham | 0:19f9af07424a | 86 | serial.printf("Write %d bytes to 0x700: %d\r\n", testDataLength, eeram.write(0x700, data, testDataLength)); |
vargham | 0:19f9af07424a | 87 | |
vargham | 0:19f9af07424a | 88 | //Dump |
vargham | 0:19f9af07424a | 89 | serial.printf("Dump contents 0x0, 16\r\n"); |
vargham | 0:19f9af07424a | 90 | eeram.dump(serial, 0x0, testDataLength); |
vargham | 0:19f9af07424a | 91 | serial.printf("Dump contents 0x500, 16\r\n"); |
vargham | 0:19f9af07424a | 92 | eeram.dump(serial, 0x500, testDataLength); |
vargham | 0:19f9af07424a | 93 | serial.printf("Dump contents 0x700, 16\r\n"); |
vargham | 0:19f9af07424a | 94 | eeram.dump(serial, 0x700, testDataLength); |
vargham | 0:19f9af07424a | 95 | //serial.printf("Dump all\r\n"); |
vargham | 0:19f9af07424a | 96 | //eeram.dump(serial); |
vargham | 0:19f9af07424a | 97 | serial.printf("Dump done\r\n"); |
vargham | 0:19f9af07424a | 98 | |
vargham | 0:19f9af07424a | 99 | //Read back |
vargham | 0:19f9af07424a | 100 | fillTestData(data, 0x0, testDataLength); |
vargham | 0:19f9af07424a | 101 | serial.printf("Read back 16 bytes from 0x500: %d\r\n", eeram.read(0x500, data, testDataLength)); |
vargham | 0:19f9af07424a | 102 | serial.printf("%.4X ", 0x500); |
vargham | 0:19f9af07424a | 103 | for (int i = 0; i < testDataLength; i++) |
vargham | 0:19f9af07424a | 104 | { |
vargham | 0:19f9af07424a | 105 | serial.printf("%.2X ", data[i]); |
vargham | 0:19f9af07424a | 106 | } |
vargham | 0:19f9af07424a | 107 | serial.printf("\r\n"); |
vargham | 0:19f9af07424a | 108 | } |
vargham | 0:19f9af07424a | 109 | |
vargham | 0:19f9af07424a | 110 | void eeramRegisterTest() |
vargham | 0:19f9af07424a | 111 | { |
vargham | 0:19f9af07424a | 112 | eeram.dumpRegisters(serial); |
vargham | 0:19f9af07424a | 113 | } |
vargham | 0:19f9af07424a | 114 | |
vargham | 0:19f9af07424a | 115 | int main() |
vargham | 0:19f9af07424a | 116 | { |
vargham | 0:19f9af07424a | 117 | serial.baud(460800); |
vargham | 0:19f9af07424a | 118 | i2c.frequency(I2C_FREQUENCY); //Hz |
vargham | 0:19f9af07424a | 119 | serial.printf("\r\nI2C EERAM example\r\n"); |
vargham | 0:19f9af07424a | 120 | |
vargham | 0:19f9af07424a | 121 | //printI2C(); |
vargham | 0:19f9af07424a | 122 | |
vargham | 0:19f9af07424a | 123 | serial.printf("Is EERAM device ready?\r\n"); |
vargham | 0:19f9af07424a | 124 | while (!eeram.isReady()); |
vargham | 0:19f9af07424a | 125 | serial.printf("Device is ready.\r\n"); |
vargham | 0:19f9af07424a | 126 | |
vargham | 0:19f9af07424a | 127 | eeram.readStatus(); |
vargham | 0:19f9af07424a | 128 | eeram.setAutoStoreEnabled(true); |
vargham | 0:19f9af07424a | 129 | eeram.setProtectedMemoryArea(U64); |
vargham | 0:19f9af07424a | 130 | eeram.writeStatusIfChanged(true); |
vargham | 0:19f9af07424a | 131 | serial.printf("Status: %.2X\r\n", eeram.getStatus()); |
vargham | 0:19f9af07424a | 132 | |
vargham | 0:19f9af07424a | 133 | eeramDataTest(); |
vargham | 0:19f9af07424a | 134 | |
vargham | 0:19f9af07424a | 135 | eeramRegisterTest(); |
vargham | 0:19f9af07424a | 136 | |
vargham | 0:19f9af07424a | 137 | //eeram.store(true); |
vargham | 0:19f9af07424a | 138 | //eeram.recall(true); |
vargham | 0:19f9af07424a | 139 | |
vargham | 0:19f9af07424a | 140 | while (true) |
vargham | 0:19f9af07424a | 141 | { |
vargham | 0:19f9af07424a | 142 | |
vargham | 0:19f9af07424a | 143 | } |
vargham | 0:19f9af07424a | 144 | } |