diff options
| -rw-r--r-- | example.c | 69 |
1 files changed, 21 insertions, 48 deletions
@@ -36,68 +36,41 @@ void send_str(const char *s); uint8_t recv_str(char *buf, uint8_t size); void parse_and_execute_command(const char *buf, uint8_t num); -#if 0 // Very simple character echo test int main(void) { + int changed = 0; + int port = 'B' - 'A'; + int pin = '0' - '0'; + int val; CPU_PRESCALE(0); usb_init(); - while (1) { - int n = usb_serial_getchar(); - if (n >= 0) usb_serial_putchar(n); - } -} + LED_CONFIG; + while (!usb_configured()) /* wait */ ; + _delay_ms(1000); -#else + LED_ON; -// Basic command interpreter for controlling port pins -int main(void) -{ - char buf[32]; - uint8_t n; - // set for 16 MHz clock, and turn on the LED - CPU_PRESCALE(0); - LED_CONFIG; - LED_ON; + uint8_t *portload = 0x20 + port * 3; + + *(uint8_t *)(0x21 + port * 3) &= ~(1 << pin); - // initialize the USB, and then wait for the host - // to set configuration. If the Teensy is powered - // without a PC connected to the USB port, this - // will wait forever. - usb_init(); - while (!usb_configured()) /* wait */ ; - _delay_ms(1000); while (1) { - // wait for the user to run their terminal emulator program - // which sets DTR to indicate it is ready to receive. - while (!(usb_serial_get_control() & USB_SERIAL_DTR)) /* wait */ ; - - // discard anything that was received prior. Sometimes the - // operating system or other software will send a modem - // "AT command", which can still be buffered. - usb_serial_flush_input(); - - // print a nice welcome message - send_str(PSTR("\r\nTeensy USB Serial Example, " - "Simple Pin Control Shell\r\n\r\n" - "Example Commands\r\n" - " B0? Read Port B, pin 0\r\n" - " C2=0 Write Port C, pin 1 LOW\r\n" - " D6=1 Write Port D, pin 6 HIGH (D6 is LED pin)\r\n\r\n")); - - // and then listen for commands and process them - while (1) { - send_str(PSTR("> ")); - n = recv_str(buf, sizeof(buf)); - if (n == 255) break; - send_str(PSTR("\r\n")); - parse_and_execute_command(buf, n); + val = *portload & (1 << pin); +// usb_serial_putchar(val + '0'); + if ((val == 1) && (changed == 0)) { + changed = 1; + usb_serial_putchar(val ? '1' : '0'); + LED_ON; + } else if ((val == 0) && (changed == 1)) { + changed = 0; + usb_serial_putchar(val ? '1' : '0'); + LED_OFF; } } } -#endif // Send a string to the USB serial port. The string must be in // flash memory, using PSTR |