Sille Van Landschoot / Mbed 2 deprecated mbed_slave_full

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Dependencies:   mbed

main.cpp@4:f537311ddc53, 2014-10-14 (annotated)

Committer:
dwini
Date:
Tue Oct 14 09:10:45 2014 +0000
Revision:
4:f537311ddc53
Parent:
3:01b322df3731
Child:
5:b73ea174e997
Dried it out using OOP and also added retrieving of values.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dwini 0:e24b497adfce 1 #include "mbed.h"
dwini 4:f537311ddc53 2 #include "memory.h"
dwini 0:e24b497adfce 3
dwini 1:e8ff4ff5a726 4 DigitalOut aLED(LED1);
dwini 0:e24b497adfce 5 Serial pc(USBTX, USBRX); // tx, rx
dwini 0:e24b497adfce 6 I2CSlave slave(p28, p27);
dwini 0:e24b497adfce 7
dwini 1:e8ff4ff5a726 8 const int SLAVE_ADDRESS = 0x84;
dwini 2:49bb6ee1191c 9 const int I2C_FREQUENCY = 100000;
dwini 4:f537311ddc53 10 const int I2C_BUFFER_SIZE = 5;
dwini 2:49bb6ee1191c 11
dwini 3:01b322df3731 12 enum COMMAND { PUSH, PULL, CLEAR, PRINT };
dwini 0:e24b497adfce 13
dwini 4:f537311ddc53 14 #define intToByte(pbytebuff,intval) (*((int*)(pbytebuff)) = intval)
dwini 4:f537311ddc53 15 #define byteToInt(pbytebuff,pintval) (*(pintval) = *((int*)(pbytebuff)))
dwini 0:e24b497adfce 16
dwini 0:e24b497adfce 17 int main() {
dwini 0:e24b497adfce 18 pc.baud(115200);
dwini 0:e24b497adfce 19 pc.printf("Size of integer is %d bytes\r\n", sizeof(int));
dwini 2:49bb6ee1191c 20
dwini 2:49bb6ee1191c 21 // Alive LED
dwini 2:49bb6ee1191c 22 int cAlive = 0;
dwini 2:49bb6ee1191c 23
dwini 2:49bb6ee1191c 24 // Configure I2C
dwini 2:49bb6ee1191c 25 slave.frequency(I2C_FREQUENCY);
dwini 2:49bb6ee1191c 26 pc.printf("Slave is working @ %dHz\r\n", I2C_FREQUENCY);
dwini 2:49bb6ee1191c 27 slave.address(SLAVE_ADDRESS);
dwini 2:49bb6ee1191c 28 pc.printf("Slave is working @ SLAVE_ADDRESS = 0x%x\r\n", SLAVE_ADDRESS);
dwini 0:e24b497adfce 29
dwini 4:f537311ddc53 30 // Setup memory
dwini 4:f537311ddc53 31 Memory memory;
dwini 4:f537311ddc53 32 pc.printf("Size of memory buffer is %d elements\r\n", Memory::MEMORY_SIZE);
dwini 4:f537311ddc53 33 memory.print();
dwini 4:f537311ddc53 34 pc.printf("Awaiting commands from master ...\r\n");
dwini 0:e24b497adfce 35
dwini 2:49bb6ee1191c 36 // I2C buffer
dwini 2:49bb6ee1191c 37 char buffer[I2C_BUFFER_SIZE];
dwini 0:e24b497adfce 38
dwini 4:f537311ddc53 39 // Internal address pointer
dwini 4:f537311ddc53 40 int pointer = 0;
dwini 4:f537311ddc53 41
dwini 0:e24b497adfce 42 while (1) {
dwini 0:e24b497adfce 43 int i = slave.receive();
dwini 0:e24b497adfce 44 switch (i) {
dwini 4:f537311ddc53 45 case I2CSlave::ReadAddressed:
dwini 4:f537311ddc53 46 {
dwini 4:f537311ddc53 47 int value = memory.get(pointer);
dwini 4:f537311ddc53 48 buffer[0] = pointer;
dwini 4:f537311ddc53 49 intToByte(buffer+1, value);
dwini 4:f537311ddc53 50 if (!slave.write(buffer, I2C_BUFFER_SIZE)) {
dwini 4:f537311ddc53 51 pc.printf("Retrieving and sending to master %d@%d\r\n", value, pointer);
dwini 4:f537311ddc53 52 } else {
dwini 4:f537311ddc53 53 pc.printf("Failed to send to master %d@%d\r\n", value, pointer);
dwini 0:e24b497adfce 54 }
dwini 4:f537311ddc53 55 break;
dwini 4:f537311ddc53 56 }
dwini 0:e24b497adfce 57 case I2CSlave::WriteAddressed:
dwini 4:f537311ddc53 58 {
dwini 2:49bb6ee1191c 59 if (!slave.read(buffer, I2C_BUFFER_SIZE)) {
dwini 2:49bb6ee1191c 60 // Check command byte
dwini 2:49bb6ee1191c 61 switch (buffer[0]) {
dwini 2:49bb6ee1191c 62 case PUSH:
dwini 4:f537311ddc53 63 {
dwini 4:f537311ddc53 64 int address = buffer[1];
dwini 4:f537311ddc53 65 int value;
dwini 4:f537311ddc53 66 byteToInt(buffer+2, &value);
dwini 4:f537311ddc53 67 pc.printf("Storing %d@%d\r\n", value, address);
dwini 4:f537311ddc53 68 memory.set(address, value);
dwini 4:f537311ddc53 69 break;
dwini 4:f537311ddc53 70 }
dwini 4:f537311ddc53 71
dwini 4:f537311ddc53 72 case PRINT:
dwini 4:f537311ddc53 73 {
dwini 4:f537311ddc53 74 memory.print();
dwini 4:f537311ddc53 75 break;
dwini 4:f537311ddc53 76 }
dwini 4:f537311ddc53 77
dwini 4:f537311ddc53 78 case PULL:
dwini 4:f537311ddc53 79 {
dwini 4:f537311ddc53 80 pc.printf("Setting pointer to %d\r\n", buffer[1]);
dwini 4:f537311ddc53 81 if (buffer[1] < Memory::MEMORY_SIZE) {
dwini 4:f537311ddc53 82 pointer = buffer[1];
dwini 2:49bb6ee1191c 83 } else {
dwini 2:49bb6ee1191c 84 pc.printf("Address out of boundary\r\n");
dwini 2:49bb6ee1191c 85 }
dwini 2:49bb6ee1191c 86 break;
dwini 4:f537311ddc53 87 }
dwini 3:01b322df3731 88
dwini 2:49bb6ee1191c 89 default:
dwini 4:f537311ddc53 90 {
dwini 2:49bb6ee1191c 91 pc.printf("Unknown command byte\r\n");
dwini 4:f537311ddc53 92 }
dwini 2:49bb6ee1191c 93 }
dwini 2:49bb6ee1191c 94 } else {
dwini 2:49bb6ee1191c 95 pc.printf("Received WriteAddressed] without data\r\n");
dwini 0:e24b497adfce 96 }
dwini 0:e24b497adfce 97 break;
dwini 4:f537311ddc53 98 }
dwini 0:e24b497adfce 99 }
dwini 2:49bb6ee1191c 100
dwini 2:49bb6ee1191c 101 // Clear buffer
dwini 2:49bb6ee1191c 102 for (int i = 0; i < I2C_BUFFER_SIZE; i++) {
dwini 2:49bb6ee1191c 103 buffer[i] = 0;
dwini 2:49bb6ee1191c 104 }
dwini 0:e24b497adfce 105
dwini 1:e8ff4ff5a726 106 // Alive LED
dwini 1:e8ff4ff5a726 107 cAlive = (cAlive + 1) % 100000;
dwini 1:e8ff4ff5a726 108 if (!cAlive) {
dwini 1:e8ff4ff5a726 109 aLED = !aLED;
dwini 1:e8ff4ff5a726 110 }
dwini 0:e24b497adfce 111 }
dwini 0:e24b497adfce 112 }