Sille Van Landschoot / Mbed 2 deprecated mbed_slave_full

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Dependencies:   mbed

main.cpp@2:49bb6ee1191c, 2014-10-13 (annotated)

Committer:
dwini
Date:
Mon Oct 13 14:34:40 2014 +0000
Revision:
2:49bb6ee1191c
Parent:
1:e8ff4ff5a726
Child:
3:01b322df3731
Add push to slave

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dwini 0:e24b497adfce 1 #include "mbed.h"
dwini 0:e24b497adfce 2
dwini 1:e8ff4ff5a726 3 DigitalOut aLED(LED1);
dwini 0:e24b497adfce 4 Serial pc(USBTX, USBRX); // tx, rx
dwini 0:e24b497adfce 5 I2CSlave slave(p28, p27);
dwini 0:e24b497adfce 6
dwini 1:e8ff4ff5a726 7 const int SLAVE_ADDRESS = 0x84;
dwini 0:e24b497adfce 8 const int MEMORY_SIZE = 16;
dwini 2:49bb6ee1191c 9 const int I2C_FREQUENCY = 100000;
dwini 2:49bb6ee1191c 10 const int I2C_BUFFER_SIZE = 10;
dwini 2:49bb6ee1191c 11
dwini 2:49bb6ee1191c 12 enum COMMAND { PUSH, PULL, CLEAR };
dwini 0:e24b497adfce 13
dwini 0:e24b497adfce 14 int memory[MEMORY_SIZE];
dwini 0:e24b497adfce 15
dwini 2:49bb6ee1191c 16 /*
dwini 2:49bb6ee1191c 17 * Set all memory locations to 0x55
dwini 2:49bb6ee1191c 18 */
dwini 0:e24b497adfce 19 void initializeMemory(void)
dwini 0:e24b497adfce 20 {
dwini 0:e24b497adfce 21 for (int i = 0; i < MEMORY_SIZE; i++) {
dwini 2:49bb6ee1191c 22 memory[i] = 0x55;
dwini 0:e24b497adfce 23 }
dwini 0:e24b497adfce 24 }
dwini 0:e24b497adfce 25
dwini 0:e24b497adfce 26 int main() {
dwini 0:e24b497adfce 27 pc.baud(115200);
dwini 0:e24b497adfce 28 pc.printf("Size of integer is %d bytes\r\n", sizeof(int));
dwini 0:e24b497adfce 29 pc.printf("Size of memory buffer is %d elements\r\n", MEMORY_SIZE);
dwini 2:49bb6ee1191c 30
dwini 2:49bb6ee1191c 31 // Alive LED
dwini 2:49bb6ee1191c 32 int cAlive = 0;
dwini 2:49bb6ee1191c 33
dwini 2:49bb6ee1191c 34 // Configure I2C
dwini 2:49bb6ee1191c 35 slave.frequency(I2C_FREQUENCY);
dwini 2:49bb6ee1191c 36 pc.printf("Slave is working @ %dHz\r\n", I2C_FREQUENCY);
dwini 2:49bb6ee1191c 37 slave.address(SLAVE_ADDRESS);
dwini 2:49bb6ee1191c 38 pc.printf("Slave is working @ SLAVE_ADDRESS = 0x%x\r\n", SLAVE_ADDRESS);
dwini 0:e24b497adfce 39
dwini 0:e24b497adfce 40 // Make sure memory buffer is zeroed
dwini 0:e24b497adfce 41 initializeMemory();
dwini 0:e24b497adfce 42
dwini 2:49bb6ee1191c 43 // I2C buffer
dwini 2:49bb6ee1191c 44 char buffer[I2C_BUFFER_SIZE];
dwini 0:e24b497adfce 45
dwini 0:e24b497adfce 46 while (1) {
dwini 0:e24b497adfce 47 int i = slave.receive();
dwini 0:e24b497adfce 48 switch (i) {
dwini 2:49bb6ee1191c 49 /*case I2CSlave::ReadAddressed:
dwini 0:e24b497adfce 50 pc.printf("Slave received command: %d [ReadAddressed]\r\n", i);
dwini 0:e24b497adfce 51
dwini 0:e24b497adfce 52 if (slave.write(msg, strlen(msg) + 1) == 0) {
dwini 0:e24b497adfce 53 printf("Sending %s to master\r\n", msg);
dwini 0:e24b497adfce 54 }
dwini 2:49bb6ee1191c 55 break;*/
dwini 0:e24b497adfce 56
dwini 0:e24b497adfce 57 case I2CSlave::WriteAddressed:
dwini 2:49bb6ee1191c 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 2:49bb6ee1191c 63 pc.printf("Storing %d@%d\r\n", *((int*)(&(buffer[2]))), buffer[1]);
dwini 2:49bb6ee1191c 64 if (buffer[1] < MEMORY_SIZE) {
dwini 2:49bb6ee1191c 65 memory[buffer[1]] = *((int*)(&(buffer[2])));
dwini 2:49bb6ee1191c 66 } else {
dwini 2:49bb6ee1191c 67 pc.printf("Address out of boundary\r\n");
dwini 2:49bb6ee1191c 68 }
dwini 2:49bb6ee1191c 69 break;
dwini 2:49bb6ee1191c 70
dwini 2:49bb6ee1191c 71 default:
dwini 2:49bb6ee1191c 72 pc.printf("Unknown command byte\r\n");
dwini 2:49bb6ee1191c 73 }
dwini 2:49bb6ee1191c 74 } else {
dwini 2:49bb6ee1191c 75 pc.printf("Received WriteAddressed] without data\r\n");
dwini 0:e24b497adfce 76 }
dwini 0:e24b497adfce 77 break;
dwini 0:e24b497adfce 78 }
dwini 2:49bb6ee1191c 79
dwini 2:49bb6ee1191c 80 // Clear buffer
dwini 2:49bb6ee1191c 81 for (int i = 0; i < I2C_BUFFER_SIZE; i++) {
dwini 2:49bb6ee1191c 82 buffer[i] = 0;
dwini 2:49bb6ee1191c 83 }
dwini 0:e24b497adfce 84
dwini 1:e8ff4ff5a726 85 // Alive LED
dwini 1:e8ff4ff5a726 86 cAlive = (cAlive + 1) % 100000;
dwini 1:e8ff4ff5a726 87 if (!cAlive) {
dwini 1:e8ff4ff5a726 88 aLED = !aLED;
dwini 1:e8ff4ff5a726 89 }
dwini 0:e24b497adfce 90 }
dwini 0:e24b497adfce 91 }