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1 /* Name: main.c |
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2 * Author: <insert your name here> |
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3 * Copyright: <insert your copyright message here> |
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4 * License: <insert your license reference here> |
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5 */ |
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6 |
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7 #include <avr/io.h> |
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8 #include <stdio.h> |
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9 #include <string.h> |
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10 #include <util/crc16.h> |
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11 |
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12 // configuration params |
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13 // - measurement interval |
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14 // - transmit interval |
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15 // - bluetooth params |
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16 // - number of sensors (and range?) |
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17 |
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18 static int uart_putchar(char c, FILE *stream); |
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19 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
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20 _FDEV_SETUP_WRITE); |
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21 |
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22 static uint8_t n_measurements; |
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23 static uint8_t measurements[500]; |
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24 |
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25 static uint8_t readpos; |
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26 static char readbuf[30]; |
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27 |
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28 static void |
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29 uart_init(unsigned int baud) |
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30 { |
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31 // baud rate |
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32 UBRRH = (unsigned char)(baud >> 8); |
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33 UBRRL = (unsigned char)baud; |
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34 UCSRB = (1<<RXEN)|(1<<TXEN); |
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35 //8N1 |
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36 UCSRC = (1<<URSEL)|(3<<UCSZ0); |
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37 } |
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38 |
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39 static int |
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40 uart_putchar(char c, FILE *stream) |
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41 { |
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42 // XXX should sleep in the loop for power. |
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43 loop_until_bit_is_set(UCSRA, UDRE); |
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44 UDR = c; |
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45 return 0; |
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46 } |
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47 |
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48 static void |
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49 cmd_fetch() |
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50 { |
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51 uint16_t crc = 0; |
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52 int i; |
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53 printf("%d measurements\n", n_measurements); |
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54 for (i = 0; i < n_measurements; i++) |
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55 { |
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56 printf("%3d : %d\n", i, measurements[i]); |
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57 crc = _crc_ccitt_updatec(crc, measurements[i]); |
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58 } |
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59 printf("CRC : %d\n", i, measurements[i]); |
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60 } |
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61 |
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62 static void |
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63 cmd_clear() |
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64 { |
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65 } |
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66 |
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67 static void |
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68 cmd_btoff() |
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69 { |
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70 } |
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71 |
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72 static void |
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73 read_handler() |
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74 { |
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75 if (strcmp(readbuf, "fetch") == 0) |
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76 { |
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77 cmd_fetch(); |
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78 } |
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79 else if (strcmp(readbuf, "clear") == 0) |
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80 { |
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81 cmd_clear(); |
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82 } |
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83 else if (strcmp(readbuf, "btoff") == 0) |
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84 { |
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85 cmd_btoff(); |
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86 } |
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87 else |
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88 { |
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89 printf("Bad command\n"); |
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90 } |
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91 } |
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92 |
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93 ISR(UART_RX_vect) |
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94 { |
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95 char c = UDR; |
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96 if (c == '\n') |
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97 { |
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98 readbuf[readpos] = '\0'; |
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99 read_handler(); |
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100 readpos = 0; |
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101 } |
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102 else |
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103 { |
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104 readbuf[readpos] = c; |
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105 readpos++; |
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106 if (readpos >= sizeof(readbuf)) |
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107 { |
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108 readpos = 0; |
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109 } |
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110 } |
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111 } |
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112 |
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113 int main(void) |
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114 { |
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115 uart_init(9600); |
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116 |
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117 fprintf(&mystdout, "hello %d\n", 12); |
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118 |
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119 // get current time |
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120 |
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121 for(;;){ |
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122 /* insert your main loop code here */ |
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123 } |
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124 return 0; /* never reached */ |
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125 } |
