Marek Trojan / _8_CONV

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed-src

Fork of _8_CONV_1_SLAVE by Marek Trojan

main.cpp@5:d622f8a4a016, 2015-12-17 (annotated)

Committer:
marcus255
Date:
Thu Dec 17 00:03:01 2015 +0000
Revision:
5:d622f8a4a016
Parent:
4:9e2adff677ac
Child:
6:b9578f756c9c
hardware address getting - not work for now;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcus255 0:ab0f6f4ef7ac 1 // Conv1 Slave
marcus255 0:ab0f6f4ef7ac 2 #include "main.h"
marcus255 0:ab0f6f4ef7ac 3
marcus255 5:d622f8a4a016 4 int main()
marcus255 5:d622f8a4a016 5 {
marcus255 0:ab0f6f4ef7ac 6 init();
marcus255 0:ab0f6f4ef7ac 7 while (1) {}
marcus255 0:ab0f6f4ef7ac 8 }
marcus255 0:ab0f6f4ef7ac 9
marcus255 5:d622f8a4a016 10 void i2cStart(void)
marcus255 5:d622f8a4a016 11 {
marcus255 0:ab0f6f4ef7ac 12 SDA_interrupt.disable_irq();
marcus255 0:ab0f6f4ef7ac 13 char addr = (char)slave.read();
marcus255 5:d622f8a4a016 14 if (addr & 0x01 == 0x01) { //reading from slave
marcus255 5:d622f8a4a016 15 char uart_rec2;
marcus255 5:d622f8a4a016 16 device.putc(DATA_TO_WRITE_CHAR);
marcus255 5:d622f8a4a016 17 device.putc(addr);
marcus255 5:d622f8a4a016 18 while(1) {
marcus255 5:d622f8a4a016 19 device.putc(DATA_TO_READ_CHAR);
marcus255 5:d622f8a4a016 20 while(1) { // waiting for data byte from conv2
marcus255 5:d622f8a4a016 21 if(device.readable()) {
marcus255 5:d622f8a4a016 22 if (device.getc() == UART_CHAR_INCOMING) {
marcus255 5:d622f8a4a016 23 uart_rec2 = device.getc();
marcus255 5:d622f8a4a016 24 break;
marcus255 5:d622f8a4a016 25 }
marcus255 5:d622f8a4a016 26 }
marcus255 5:d622f8a4a016 27 }
marcus255 5:d622f8a4a016 28 if(!slave.write(uart_rec2)) {
marcus255 5:d622f8a4a016 29 device.putc(END_OF_TRANSMISSION);
marcus255 5:d622f8a4a016 30 break;
marcus255 5:d622f8a4a016 31 }
marcus255 5:d622f8a4a016 32 }
marcus255 5:d622f8a4a016 33 slave.read();
marcus255 5:d622f8a4a016 34 } else {
marcus255 0:ab0f6f4ef7ac 35 count = 0;
marcus255 0:ab0f6f4ef7ac 36 char uart_rec;
marcus255 0:ab0f6f4ef7ac 37 device.putc(DATA_TO_WRITE_CHAR);
marcus255 0:ab0f6f4ef7ac 38 device.putc(addr);
marcus255 4:9e2adff677ac 39 while(!SDA_state) { //writting to slave
marcus255 0:ab0f6f4ef7ac 40 buffer = (char)slave.read();
marcus255 5:d622f8a4a016 41 for(int y = 0; y < 1024; y++) {} //some delay required for signal establishment
marcus255 0:ab0f6f4ef7ac 42 if(SDA_state) break;
marcus255 0:ab0f6f4ef7ac 43 device.putc(DATA_TO_WRITE_CHAR);
marcus255 5:d622f8a4a016 44 device.putc(buffer);
marcus255 5:d622f8a4a016 45
marcus255 0:ab0f6f4ef7ac 46 while(1) { // waiting until confirmation char is received from converter 2
marcus255 0:ab0f6f4ef7ac 47 if(device.readable()) {
marcus255 0:ab0f6f4ef7ac 48 uart_rec = device.getc();
marcus255 0:ab0f6f4ef7ac 49 if(uart_rec == UART_CONFIRMATION_CHAR || uart_rec == UART_NON_CONFIRMATION_CHAR)
marcus255 0:ab0f6f4ef7ac 50 break;
marcus255 0:ab0f6f4ef7ac 51 }
marcus255 0:ab0f6f4ef7ac 52 }
marcus255 0:ab0f6f4ef7ac 53 if (uart_rec == UART_NON_CONFIRMATION_CHAR)
marcus255 0:ab0f6f4ef7ac 54 break;
marcus255 5:d622f8a4a016 55 }
marcus255 0:ab0f6f4ef7ac 56 device.putc(END_OF_TRANSMISSION);
marcus255 0:ab0f6f4ef7ac 57 }
marcus255 0:ab0f6f4ef7ac 58 SDA_interrupt.enable_irq();
marcus255 0:ab0f6f4ef7ac 59 }
marcus255 0:ab0f6f4ef7ac 60
marcus255 5:d622f8a4a016 61 void init(void)
marcus255 5:d622f8a4a016 62 {
marcus255 5:d622f8a4a016 63 device.baud(921600);
marcus255 5:d622f8a4a016 64 SDA_interrupt.fall(&on_SDA_falling_slope_interrupt);
marcus255 5:d622f8a4a016 65 }
marcus255 5:d622f8a4a016 66
marcus255 5:d622f8a4a016 67 void on_SDA_falling_slope_interrupt(void)
marcus255 5:d622f8a4a016 68 {
marcus255 5:d622f8a4a016 69 SDA_interrupt.disable_irq();
marcus255 5:d622f8a4a016 70 int prev_state = 1;
marcus255 5:d622f8a4a016 71 int temp_state;
marcus255 5:d622f8a4a016 72 uint8_t address = 0;
marcus255 5:d622f8a4a016 73 for (int i = 7; i >= 0; i--) //for every clock cycle in frame
marcus255 5:d622f8a4a016 74 {
marcus255 5:d622f8a4a016 75 while(1) //sample CLK line state
marcus255 5:d622f8a4a016 76 {
marcus255 5:d622f8a4a016 77 if ((temp_state = SCL_state) == prev_state)
marcus255 5:d622f8a4a016 78 continue;
marcus255 5:d622f8a4a016 79 else
marcus255 5:d622f8a4a016 80 {
marcus255 5:d622f8a4a016 81 if (SDA_state == 1)
marcus255 5:d622f8a4a016 82 address |= (0x01 << i);
marcus255 5:d622f8a4a016 83 prev_state = temp_state;
marcus255 5:d622f8a4a016 84 //device.putc((char)SDA_state);
marcus255 5:d622f8a4a016 85 break;
marcus255 5:d622f8a4a016 86 }
marcus255 5:d622f8a4a016 87 }
marcus255 5:d622f8a4a016 88 }
marcus255 5:d622f8a4a016 89
marcus255 5:d622f8a4a016 90 // now we (probably) know the Slave address, so we can initialize i2c bus
marcus255 5:d622f8a4a016 91 // and set this Conv as Conv1 and send info to second Conv to act as Conv2
marcus255 5:d622f8a4a016 92
marcus255 5:d622f8a4a016 93 //device.putc(SET_CONV2_FUNCT);
marcus255 5:d622f8a4a016 94 device.putc(address);
marcus255 5:d622f8a4a016 95 //init_I2C(address, 100000);
marcus255 5:d622f8a4a016 96 SDA_interrupt.enable_irq();
marcus255 5:d622f8a4a016 97 }
marcus255 5:d622f8a4a016 98
marcus255 5:d622f8a4a016 99 void init_I2C(char addr, int freq)
marcus255 5:d622f8a4a016 100 {
marcus255 0:ab0f6f4ef7ac 101 SDA_interrupt.fall(&i2cStart);
marcus255 5:d622f8a4a016 102 slave.address(addr);
marcus255 5:d622f8a4a016 103 slave.frequency(freq);
marcus255 0:ab0f6f4ef7ac 104 }