// // hello.ftdi.44.echo.c // // 115200 baud FTDI character echo, with flash string // // set lfuse to 0x7E for 20 MHz xtal // // Neil Gershenfeld // 12/8/10 // Additions by Lindy Liggett // 27Nov2012 // // (c) Massachusetts Institute of Technology 2010 // Permission granted for experimental and personal use; // license for commercial sale available from MIT. // #include #include #include #include //for comparing strings #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 8.5 // bit delay for 115200 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 led_delay() _delay_ms(500) //delay for Morse #define serial_port PORTA #define serial_direction DDRA #define serial_pins PINA #define serial_pin_in (1 << PA0) #define serial_pin_out (1 << PA1) #define led_port PORTB #define led_direction DDRB #define led (1 << PB2) //all on the same pin #define max_buffer 2 //if you do max buffer 2 it only shows last thing you typed (0 ends the string) 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(); } 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_flash_string(volatile unsigned char *port, unsigned char pin, PGM_P str) { // // print a null-terminated string from flash // static char chr; static int index; index = 0; do { chr = pgm_read_byte(&(str[index])); put_char(port, pin, chr); // is this what writes it back? ++index; } while (chr != 0); } void put_ram_string(volatile unsigned char *port, unsigned char pin, char *str) { // // print a null-terminated string from SRAM // static int index; index = 0; do { put_char(port, pin, str[index]); //is this what writes it back? ++index; } while (str[index] != 0); } void dot(void){ //turn light on for 1 delay clear(led_port,led); led_delay(); set(led_port,led); led_delay(); } void dash(void){ //turn light on for 2 delays clear(led_port,led); led_delay(); led_delay(); led_delay(); //added another to make it clearer set(led_port,led); led_delay(); } void end(void){ //seven dits between words //one already from dot or dash led_delay(); led_delay(); led_delay(); led_delay(); led_delay(); led_delay(); } void space(void){ //end of a letter is three dits //but one is already from the dot or dash call led_delay(); led_delay(); } int main(void) { // // main // static char chr; static char buffer[max_buffer] = {0}; //always ends in a 0 //static char lindy[1] = {0}; //my new string ends in a 0 static int index; // // set clock divider to /1 // CLKPR = (1 << CLKPCE); CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0); // // initialize output pins // set(serial_port, serial_pin_out); output(serial_direction, serial_pin_out); clear(led_port, led); // | is bitwise operation, || is logical OR output(led_direction, led); led_delay(); set(led_port,led); //just testin out the led dot(); dot(); //dot(); //space(); //dash(); //dash(); //dash(); //end(); //dot(); //dash(); // // main loop // index = 0; //static char test[2] = {0}; //always ends in a 0 //static char test[1] = {"l"}; char test[] = ".-_ "; while (1) { get_char(&serial_pins, serial_pin_in, &chr); //I think this is where it gets the letters... but I want the python script to actually send something! not just the keyboard static char message[] PROGMEM = "hello.c: you typed \""; put_flash_string(&serial_port, serial_pin_out, (PGM_P) message); buffer[index++] = chr; if (index == (max_buffer-1)) index = 0; //put_char(&serial_port, serial_pin_out, 2); //say it's not ready if (test[0] == buffer[index-1]){ //read the letter and decide what to do put_ram_string(&serial_port, serial_pin_out, "dot"); dot(); } else if (test[1] == buffer[index-1]) { put_ram_string(&serial_port, serial_pin_out, "dash"); dash(); } else if (test[2] == buffer[index-1]) { put_ram_string(&serial_port, serial_pin_out, "end"); //last argument here is what gets output end(); } else if (test[3] == buffer[index-1]) { put_ram_string(&serial_port, serial_pin_out, "space"); space(); } //put_char(&serial_port, serial_pin_out, 3); //say it's ready put_ram_string(&serial_port, serial_pin_out, buffer); put_char(&serial_port, serial_pin_out, '\"'); put_char(&serial_port, serial_pin_out, 10); // new line } }