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LED on PINB0 & PINB1 and UART testing. - LED flasing on PINB0 & PINB1. - print 'hello' messages to UART for every flashing round.
author Thinker K.F. Li <thinker@branda.to>
date Sat, 21 Feb 2009 15:49:59 +0800
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children
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0
a0ce8ebf2f18 LED on PINB0 & PINB1 and UART testing.
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1 #ifndef __AVRIOTOOLS_H_
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2 #define __AVRIOTOOLS_H_
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3 #include <stdint.h>
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4 #include <avr/io.h>
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5
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6 typedef enum {PM_INPUT, PM_OUTPUT} pin_mode_t;
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7
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8 extern int pin_mode(volatile uint8_t * port, int pin, pin_mode_t mode);
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9 #define pin_hi(port, pin) do { port |= _BV(pin); } while(0)
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10 #define pin_lo(port, pin) do { port &= ~_BV(pin); } while(0)
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11
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12
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13 #define UBRRH UBRR0L
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14 #define UBRRL UBRR0L
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15 #define UCSRA UCSR0A
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16 #define U2X U2X0
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17 #define UDRE UDRE0
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18 #define UDR UDR0
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19 #define RXC RXC0
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20 #define FE FE0
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21 #define DOR DOR0
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22
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23 extern int uart_init(uint32_t baud);
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24 #define uart_getc(c) \
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25 do { \
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26 loop_until_bit_is_set(UCSRA, RXC); \
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27 if (UCSRA & _BV(FE)) \
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28 continue; \
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29 if (UCSRA & _BV(DOR)) \
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30 continue; \
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31 c = UDR; \
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32 } while(0)
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33 /*
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34 * c == -1 if not data been read.
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35 * \note c must be an integer.
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36 */
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37 #define uart_getc_nowait(c) \
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38 do { \
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39 c = -1; \
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40 if(bit_is_clear(UCSRA, RXC)) break; \
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41 if (UCSRA & _BV(FE)) \
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42 break; \
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43 if (UCSRA & _BV(DOR)) \
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44 break; \
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45 c = UDR; \
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46 } while(0)
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47 #define uart_putc(c) \
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48 do { \
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49 loop_until_bit_is_set(UCSRA, UDRE); \
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50 UDR = ((uint8_t)(c & 0xff)); \
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51 } while(0)
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52 /*
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53 * c == -1 if it been wrote out.
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54 * \note c must be an integer.
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55 */
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56 #define uart_putc_nowait(c) \
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57 do { \
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58 if(bit_is_clear(UCSRA, UDRE)) \
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59 break; \
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60 UDR = ((uint8_t)(c & 0xff)); \
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61 c = -1; \
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62 } while(0)
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63
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64
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65 #endif /* __AVRIOTOOLS_H_ */