IEEE 802.15.4 subsystem
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| Source at commit 805db6ebf5d80692158acadf88e239da9d3e67af created 6 years 3 months ago. By Stefan Schmidt, fw/atusb: add extra steps needed for HULUSB in README | |
|---|---|
| 1 | /* |
| 2 | * fw/uart.h - Functions needed for debugging over uart |
| 3 | * |
| 4 | * Code adapted from http://www.roboternetz.de/wissen/index.php/UART_mit_avr-gcc |
| 5 | * and http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial |
| 6 | * |
| 7 | * Published under the Creative Commons Share-Alike licence |
| 8 | * https://creativecommons.org/licenses/by-sa/2.0/de/ |
| 9 | * |
| 10 | * S. Salewski 2007 |
| 11 | * |
| 12 | * Adapted by |
| 13 | * Josef Filzmaier 2017 |
| 14 | */ |
| 15 | |
| 16 | #include <avr/io.h> |
| 17 | #include "uart.h" |
| 18 | |
| 19 | #define USART_BAUD 38400UL |
| 20 | #define F_CPU 8000000UL |
| 21 | |
| 22 | #define Wait_USART_Ready() while (!(UCSR1A & (1<<UDRE1))) |
| 23 | #define UART_UBRR (F_CPU/(16L*USART_BAUD)-1) |
| 24 | |
| 25 | // initialize USART, 8N1 mode |
| 26 | void |
| 27 | uart_init(void) |
| 28 | { |
| 29 | /* TODO: Find a working configuration for uart for the atmega32u2 */ |
| 30 | #if CHIP == at90usb1287 |
| 31 | CLKPR = (1 << CLKPCE); |
| 32 | CLKPR = 0; // clock prescaler == 0, so we have 16 MHz mpu frequency |
| 33 | UBRR1 = UART_UBRR; |
| 34 | UCSR1C = (1 << UCSZ10) | (1 << UCSZ11); |
| 35 | UCSR1B = (1 << TXEN1); |
| 36 | do |
| 37 | { |
| 38 | UDR1; |
| 39 | } |
| 40 | while (UCSR1A & (1 << RXC1)); |
| 41 | #endif |
| 42 | |
| 43 | } |
| 44 | |
| 45 | int uart_write_char(char c, FILE* stream) |
| 46 | { |
| 47 | if (c == '\n'){ |
| 48 | uart_new_line(); |
| 49 | } |
| 50 | else { |
| 51 | Wait_USART_Ready(); |
| 52 | UDR1 = c; |
| 53 | } |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | void |
| 58 | uart_new_line(void) |
| 59 | { |
| 60 | Wait_USART_Ready(); |
| 61 | UDR1 = '\r'; |
| 62 | Wait_USART_Ready(); |
| 63 | UDR1 = '\n'; |
| 64 | } |
| 65 | |
