// // // hello.temp.45.c // // thermistor hello-world // 9600 baud FTDI interface // // Neil Gershenfeld // 10/27/10 // // (c) Massachusetts Institute of Technology 2010 // Permission granted for experimental and personal use; // license for commercial sale available from MIT. // //For Temperature #include #include //Extra for Bus #include #include //TEMP DEFINE #define output(directions,pin) (directions |= pin) // set port direction for output #define set(port,pin) (port |= pin) // set port pin #define clear(port,pin) (port &= (~pin)) // clear port pin #define pin_test(pins,pin) (pins & pin) // test for port pin #define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set #define bit_delay_time 100 // bit delay for 9600 with overhead #define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay #define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay #define char_delay() _delay_ms(10) // char delay #define serial_port PORTB #define serial_direction DDRB #define serial_pin_out (1 << PB2) //RX //END OF TEMP DEFINE //BUS DEFINE //#define output(directions,pin) (directions |= pin) // set port direction for output #define input(directions,pin) (directions &= (~pin)) // set port direction for input //#define set(port,pin) (port |= pin) // set port pin //#define clear(port,pin) (port &= (~pin)) // clear port pin //#define pin_test(pins,pin) (pins & pin) // test for port pin //#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set #define bit_delay_time 100 // bit delay for 9600 with overhead #define bit_delay() _delay_us(bit_delay_time) // RS232 bit delay #define half_bit_delay() _delay_us(bit_delay_time/2) // RS232 half bit delay //#define led_delay() _delay_ms(100) // LED flash delay //#define led_port PORTB //#define led_direction DDRB //#define led_pin (1 << PB0) //#define serial_port PORTB //#define serial_direction DDRB #define serial_pins PINB #define serial_pin_in (1 << PB0) //same as MOSI Pin //#define serial_pin_out (1 << PB4) //TX //DEFINING OF TEMP #define node_id '2' //END OF BUS DEFINE //TEMP FUNCTIONS void put_char(volatile unsigned char *port, unsigned char pin, char txchar) { // // send character in txchar on port pin // assumes line driver (inverts bits) // // start bit // clear(*port,pin); bit_delay(); // // unrolled loop to write data bits // if bit_test(txchar,0) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,1) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,2) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,3) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,4) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,5) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,6) set(*port,pin); else clear(*port,pin); bit_delay(); if bit_test(txchar,7) set(*port,pin); else clear(*port,pin); bit_delay(); // // stop bit // set(*port,pin); bit_delay(); // // char delay // bit_delay(); } //END OF TEMPERATURE FUNCTIONS //BUS FUNCTIONS void get_char(volatile unsigned char *pins, unsigned char pin, char *rxbyte) { // // read character into rxbyte on pins pin // assumes line driver (inverts bits) // *rxbyte = 0; while (pin_test(*pins,pin)) // // wait for start bit // ; // // delay to middle of first data bit // half_bit_delay(); bit_delay(); // // unrolled loop to read data bits // if pin_test(*pins,pin) *rxbyte |= (1 << 0); else *rxbyte |= (0 << 0); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 1); else *rxbyte |= (0 << 1); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 2); else *rxbyte |= (0 << 2); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 3); else *rxbyte |= (0 << 3); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 4); else *rxbyte |= (0 << 4); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 5); else *rxbyte |= (0 << 5); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 6); else *rxbyte |= (0 << 6); bit_delay(); if pin_test(*pins,pin) *rxbyte |= (1 << 7); else *rxbyte |= (0 << 7); // // wait for stop bit // bit_delay(); half_bit_delay(); } //Element the same as temperature code //void put_char(volatile unsigned char *port, unsigned char pin, char txchar) { // // send character in txchar on port pin // assumes line driver (inverts bits) // // start bit // //clear(*port,pin); //bit_delay(); // // unrolled loop to write data bits // //if bit_test(txchar,0) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,1) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,2) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,3) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,4) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,5) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,6) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); //if bit_test(txchar,7) //set(*port,pin); //else //clear(*port,pin); //bit_delay(); // // stop bit // //set(*port,pin); //bit_delay(); // // char delay // //bit_delay(); //} void put_string(volatile unsigned char *port, unsigned char pin, PGM_P str) { // // send character in txchar on port pin // assumes line driver (inverts bits) // static char chr; static int index; index = 0; do { chr = pgm_read_byte(&(str[index])); put_char(&serial_port, serial_pin_out, chr); ++index; } while (chr != 0); } //void flash() { // // LED flash delay // //clear(led_port, led_pin); //led_delay(); //set(led_port, led_pin); //} //END OF BUS FUNCTIONS int main(void) { // // main //BUS VARIABLES static char chr; //TEMP VARIABLES // set clock divider to /1 // CLKPR = (1 << CLKPCE); CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0); // clock divider is the same for BUS AND TEMP //CLKPR = (1 << CLKPCE); //CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0); // TEMP initialise pins // set(serial_port, serial_pin_out); output(serial_direction, serial_pin_out); // // init A/D // ADMUX = (0 << REFS2) | (0 << REFS1) | (0 << REFS0) // VCC ref | (0 << ADLAR) // right adjust | (0 << MUX3) | (1 << MUX2) | (1 << MUX1) | (1 << MUX0); // 20(PB4-PB3) ADCSRA = (1 << ADEN) // enable | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // prescaler /128 ADCSRB = (1 << BIN); // bipolar mode // // BUS initialise output pins // //set(serial_port, serial_pin_in); input(serial_direction, serial_pin_in); //set(led_port, led_pin); //output(led_direction, led_pin); // // main loop // while (1) { get_char(&serial_pins, serial_pin_in, &chr); //flash(); if (chr == 'node_id') { // change for node ID // send framing // put_char(&serial_port, serial_pin_out, 1); char_delay(); put_char(&serial_port, serial_pin_out, 2); char_delay(); put_char(&serial_port, serial_pin_out, 3); char_delay(); put_char(&serial_port, serial_pin_out, 4); char_delay(); // // initiate conversion // ADCSRA |= (1 << ADSC); // // wait for completion // while (ADCSRA & (1 << ADSC)) ; // // send result // chr = ADCL; put_char(&serial_port, serial_pin_out, chr); char_delay(); chr = ADCH; put_char(&serial_port, serial_pin_out, chr); char_delay(); } } }