Marek Trojan / _8_CONV

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Dependencies:   mbed-src

Fork of _8_CONV_1_SLAVE by Marek Trojan

main.cpp@9:58c110e686f0, 2015-12-25 (annotated)

Committer:
marcus255
Date:
Fri Dec 25 21:33:52 2015 +0000
Revision:
9:58c110e686f0
Parent:
8:47ae8b74cd43
Child:
10:7eaae60dc9e4
Final version of universal converter

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcus255 9:58c110e686f0 1 /*
marcus255 9:58c110e686f0 2 * Project: I2C to UART converter
marcus255 9:58c110e686f0 3 * File: main.cpp
marcus255 9:58c110e686f0 4 * Author: Marek Trojan
marcus255 9:58c110e686f0 5 */
marcus255 9:58c110e686f0 6
marcus255 0:ab0f6f4ef7ac 7 #include "main.h"
marcus255 0:ab0f6f4ef7ac 8
marcus255 7:e86480c767ea 9 int main()
marcus255 7:e86480c767ea 10 {
marcus255 7:e86480c767ea 11 init_conv();
marcus255 0:ab0f6f4ef7ac 12 while (1) {}
marcus255 0:ab0f6f4ef7ac 13 }
marcus255 0:ab0f6f4ef7ac 14
marcus255 8:47ae8b74cd43 15 void onUartChar()
marcus255 8:47ae8b74cd43 16 {
marcus255 8:47ae8b74cd43 17 char first_char = device.getc();
marcus255 8:47ae8b74cd43 18 if (first_char == SET_CONV2_FUNCT){
marcus255 8:47ae8b74cd43 19 char slave_address = device.getc(); // not used at all, may be delete latar
marcus255 9:58c110e686f0 20 init_conv2(I2C_FREQUENCY_STANDARD);
marcus255 8:47ae8b74cd43 21 }
marcus255 8:47ae8b74cd43 22 else if (first_char == DATA_TO_WRITE_CHAR) {
marcus255 8:47ae8b74cd43 23 char received = device.getc();
marcus255 8:47ae8b74cd43 24 if (received & 0x01 == 0x01) { // reading from slave
marcus255 8:47ae8b74cd43 25 char rec;
marcus255 8:47ae8b74cd43 26 if (!transmission) {
marcus255 8:47ae8b74cd43 27 i2c.start();
marcus255 8:47ae8b74cd43 28 transmission = 1;
marcus255 8:47ae8b74cd43 29 }
marcus255 8:47ae8b74cd43 30 if (i2c.write((int)rec)) {
marcus255 8:47ae8b74cd43 31 while (device.getc() == DATA_TO_READ_CHAR) {
marcus255 8:47ae8b74cd43 32 rec = (char)i2c.read(1);
marcus255 8:47ae8b74cd43 33 device.putc(UART_CHAR_INCOMING);
marcus255 8:47ae8b74cd43 34 device.putc(rec);
marcus255 8:47ae8b74cd43 35 }
marcus255 8:47ae8b74cd43 36 i2c.read(0);
marcus255 8:47ae8b74cd43 37 } else {
marcus255 8:47ae8b74cd43 38 device.putc(UART_NON_CONFIRMATION_CHAR);
marcus255 8:47ae8b74cd43 39 }
marcus255 8:47ae8b74cd43 40 device.putc(END_OF_TRANSMISSION);
marcus255 8:47ae8b74cd43 41 } else { // writing to slave
marcus255 8:47ae8b74cd43 42 if (!transmission) {
marcus255 8:47ae8b74cd43 43 i2c.start();
marcus255 8:47ae8b74cd43 44 transmission = 1;
marcus255 8:47ae8b74cd43 45 }
marcus255 8:47ae8b74cd43 46 if (i2c.write((int)received))
marcus255 8:47ae8b74cd43 47 device.putc(UART_CONFIRMATION_CHAR);
marcus255 8:47ae8b74cd43 48 else {
marcus255 8:47ae8b74cd43 49 device.putc(UART_NON_CONFIRMATION_CHAR);
marcus255 8:47ae8b74cd43 50 }
marcus255 8:47ae8b74cd43 51 while (device.getc() == DATA_TO_WRITE_CHAR) {
marcus255 8:47ae8b74cd43 52 received = device.getc();
marcus255 8:47ae8b74cd43 53 if (i2c.write((int)received))
marcus255 8:47ae8b74cd43 54 device.putc(UART_CONFIRMATION_CHAR);
marcus255 8:47ae8b74cd43 55 else {
marcus255 8:47ae8b74cd43 56 device.putc(UART_NON_CONFIRMATION_CHAR);
marcus255 8:47ae8b74cd43 57 break;
marcus255 8:47ae8b74cd43 58 }
marcus255 8:47ae8b74cd43 59 }
marcus255 8:47ae8b74cd43 60 }
marcus255 8:47ae8b74cd43 61 }
marcus255 9:58c110e686f0 62 i2c.stop();
marcus255 8:47ae8b74cd43 63 transmission = 0;
marcus255 8:47ae8b74cd43 64 }
marcus255 8:47ae8b74cd43 65
marcus255 7:e86480c767ea 66 void on_SDA_falling_slope_interrupt(void)
marcus255 7:e86480c767ea 67 {
marcus255 0:ab0f6f4ef7ac 68 SDA_interrupt.disable_irq();
marcus255 0:ab0f6f4ef7ac 69 char addr = (char)slave.read();
marcus255 7:e86480c767ea 70 if (addr & 0x01 == 0x01) { //reading from slave
marcus255 7:e86480c767ea 71 char uart_rec2;
marcus255 7:e86480c767ea 72 device.putc(DATA_TO_WRITE_CHAR);
marcus255 7:e86480c767ea 73 device.putc(addr);
marcus255 7:e86480c767ea 74 while(1) {
marcus255 7:e86480c767ea 75 device.putc(DATA_TO_READ_CHAR);
marcus255 7:e86480c767ea 76 while(1) { // waiting for data byte from conv2
marcus255 7:e86480c767ea 77 if(device.readable()) {
marcus255 7:e86480c767ea 78 if (device.getc() == UART_CHAR_INCOMING) {
marcus255 7:e86480c767ea 79 uart_rec2 = device.getc();
marcus255 7:e86480c767ea 80 break;
marcus255 7:e86480c767ea 81 }
marcus255 7:e86480c767ea 82 }
marcus255 7:e86480c767ea 83 }
marcus255 7:e86480c767ea 84 if(!slave.write(uart_rec2)) {
marcus255 7:e86480c767ea 85 device.putc(END_OF_TRANSMISSION);
marcus255 7:e86480c767ea 86 break;
marcus255 7:e86480c767ea 87 }
marcus255 7:e86480c767ea 88 }
marcus255 7:e86480c767ea 89 slave.read();
marcus255 7:e86480c767ea 90 } else {
marcus255 0:ab0f6f4ef7ac 91 count = 0;
marcus255 0:ab0f6f4ef7ac 92 char uart_rec;
marcus255 0:ab0f6f4ef7ac 93 device.putc(DATA_TO_WRITE_CHAR);
marcus255 0:ab0f6f4ef7ac 94 device.putc(addr);
marcus255 4:9e2adff677ac 95 while(!SDA_state) { //writting to slave
marcus255 0:ab0f6f4ef7ac 96 buffer = (char)slave.read();
marcus255 7:e86480c767ea 97 for(int y = 0; y < 1024; y++) {} //some delay required for signal establishment
marcus255 0:ab0f6f4ef7ac 98 if(SDA_state) break;
marcus255 0:ab0f6f4ef7ac 99 device.putc(DATA_TO_WRITE_CHAR);
marcus255 7:e86480c767ea 100 device.putc(buffer);
marcus255 7:e86480c767ea 101
marcus255 0:ab0f6f4ef7ac 102 while(1) { // waiting until confirmation char is received from converter 2
marcus255 0:ab0f6f4ef7ac 103 if(device.readable()) {
marcus255 0:ab0f6f4ef7ac 104 uart_rec = device.getc();
marcus255 0:ab0f6f4ef7ac 105 if(uart_rec == UART_CONFIRMATION_CHAR || uart_rec == UART_NON_CONFIRMATION_CHAR)
marcus255 0:ab0f6f4ef7ac 106 break;
marcus255 0:ab0f6f4ef7ac 107 }
marcus255 0:ab0f6f4ef7ac 108 }
marcus255 0:ab0f6f4ef7ac 109 if (uart_rec == UART_NON_CONFIRMATION_CHAR)
marcus255 0:ab0f6f4ef7ac 110 break;
marcus255 7:e86480c767ea 111 }
marcus255 0:ab0f6f4ef7ac 112 device.putc(END_OF_TRANSMISSION);
marcus255 0:ab0f6f4ef7ac 113 }
marcus255 0:ab0f6f4ef7ac 114 SDA_interrupt.enable_irq();
marcus255 0:ab0f6f4ef7ac 115 }
marcus255 0:ab0f6f4ef7ac 116
marcus255 7:e86480c767ea 117 void init_conv(void)
marcus255 7:e86480c767ea 118 {
marcus255 9:58c110e686f0 119 SDA_state.mode(PullUp);
marcus255 9:58c110e686f0 120 SDA_interrupt.mode(PullUp);
marcus255 9:58c110e686f0 121 SCL_interrupt.mode(PullNone);
marcus255 7:e86480c767ea 122 SCL_interrupt.rise(&on_SCL_rising_slope_interrupt);
marcus255 0:ab0f6f4ef7ac 123 device.baud(921600);
marcus255 7:e86480c767ea 124 discovered_address = 0;
marcus255 7:e86480c767ea 125 clk_count = 0;
marcus255 8:47ae8b74cd43 126 device.attach(&onUartChar);
marcus255 7:e86480c767ea 127 }
marcus255 7:e86480c767ea 128
marcus255 7:e86480c767ea 129 void init_conv1(int frequency, char address)
marcus255 7:e86480c767ea 130 {
marcus255 7:e86480c767ea 131 slave.frequency(frequency);
marcus255 7:e86480c767ea 132 slave.address(address);
marcus255 7:e86480c767ea 133 SDA_interrupt.fall(&on_SDA_falling_slope_interrupt);
marcus255 7:e86480c767ea 134 }
marcus255 7:e86480c767ea 135
marcus255 8:47ae8b74cd43 136 void init_conv2(int frequency)
marcus255 7:e86480c767ea 137 {
marcus255 8:47ae8b74cd43 138 i2c.frequency(frequency);
marcus255 9:58c110e686f0 139 SCL_interrupt.rise(NULL);
marcus255 7:e86480c767ea 140 }
marcus255 7:e86480c767ea 141
marcus255 7:e86480c767ea 142 void on_SCL_rising_slope_interrupt(void)
marcus255 7:e86480c767ea 143 {
marcus255 7:e86480c767ea 144 if (clk_count<9) {
marcus255 7:e86480c767ea 145 if (SDA_state)
marcus255 7:e86480c767ea 146 discovered_address |= (0x01<<(7-clk_count));
marcus255 7:e86480c767ea 147 clk_count++;
marcus255 7:e86480c767ea 148 } else {
marcus255 9:58c110e686f0 149 SCL_interrupt.rise(NULL);
marcus255 7:e86480c767ea 150 device.putc(SET_CONV2_FUNCT);
marcus255 7:e86480c767ea 151 device.putc(discovered_address);
marcus255 9:58c110e686f0 152 init_conv1(I2C_FREQUENCY_STANDARD, (char)discovered_address);
marcus255 7:e86480c767ea 153 }
marcus255 0:ab0f6f4ef7ac 154 }