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annotate src/avriotools.c @ 9:705da39cdf91

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Makefile for tests
author Thinker K.F. Li <thinker@branda.to>
date Sun, 22 Feb 2009 22:43:26 +0800
parents a0ce8ebf2f18
children
rev   line source
0
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1 #include "avriotools.h"
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2 #include <avr/io.h>
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3
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4 typedef struct _port_regs {
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5 volatile uint8_t *port, *ddr, *pin;
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6 } port_regs_t;
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7
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8 static port_regs_t regs[] = {
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9 { &PORTB, &DDRB, &PINB },
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10 { &PORTD, &DDRD, &PIND }
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11 };
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12 #define NPORTS (sizeof(regs) / sizeof(*regs))
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13
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14 #define ERR -1
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15 #define OK 0
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16
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17 int pin_mode(volatile uint8_t * port, int pin, pin_mode_t mode) {
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18 port_regs_t *preg;
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19 int i;
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20
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21 for(i = 0; i < NPORTS; i++) {
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22 preg = regs + i;
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23 if(preg->port == port)
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24 break;
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25 }
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26 if(i == NPORTS)
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27 return ERR;
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28
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29 switch(mode) {
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30 case PM_INPUT:
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31 *preg->ddr &= ~_BV(pin);
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32 *preg->port |= _BV(pin);
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33 break;
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34
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35 case PM_OUTPUT:
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36 *preg->ddr |= _BV(pin);
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37 break;
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38
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39 default:
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40 return ERR;
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41 }
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42
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43 return OK;
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44 }
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45
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46 /* To make setbaud.h no more complaint */
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47 #define BAUD 9600
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48 #include <util/setbaud.h>
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49
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50 int uart_init(uint32_t baud) {
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51 unsigned long ubrr_v;
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52 long err;
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53
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54 if(baud > (F_CPU / 8))
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55 return ERR;
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56
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57 #define F_CPUx2 (F_CPU * 2UL)
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58
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59 ubrr_v = (F_CPU + baud * 8UL) / (baud * 16UL) - 1UL;
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60 /* Allow bias of baud rate in 2%, or use U2X clock.
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61 * ATmega168 divides baud rate generator clock by 2, 8, or 16.
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62 * Setting U2X bit makes the clock divided by 8 instead of 16.
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63 * It makes more accurately output and higher max baud rate.
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64 */
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65 err = 16L * 100L * (ubrr_v + 1) * baud - F_CPU * 100L;
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66 if(err > F_CPUx2 || err < -F_CPUx2 || ubrr_v < 2) {
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67 ubrr_v = (F_CPU + baud * 4UL) / (baud * 8UL) - 1UL;
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68 UCSRA |= (1 << U2X);
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69 } else {
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70 UCSRA &= ~(1 << U2X);
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71 }
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72
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73 UBRRH = ubrr_v >> 8;
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74 UBRRL = ubrr_v & 0xff;
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75 return OK;
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76 }