Atmel AVR2070 Bedienungsanleitung PDF herunterladen (Seite 46)

A Anhang

39 trx_ bit_wr i te ( SR_CHANNEL , CHANNEL );

40 trx _ reg_wr i te ( RG_TRX_STATE , CMD_RX_ON );

41 trx _ reg_wr i te ( RG_IRQ_MASK , TRX_IRQ _RX_EN D );

43 /* enable global interrupts */

44 sei ();

46 /* wait 500 ms and indicate ready state */

47 WAIT500MS ();

48 LED _ SET_VA L UE (1);

50 /* loop and wait for frame receiving */

51 while (1);

52 }

55 /* isr forced when receivi n g of frame is completed */

56 ISR ( TRX 2 4_RX _END_ vect )

57 {

58 /* var i a b l e storing frame length */

59 uint8_t flen ;

60 /* pointer to received frame */

61 uint8_t * pfrm ;

62 /* var i a b l e storing result of checksum com p a rison */

63 uint16_t crc ;

65 /* upload frame and check for crc validity */

66 pfrm = rxfrm ;

67 flen = trx_frame _ read ( pfrm , sizeof ( rxfrm ), NULL );

68 crc = 0;

69 do

70 {

71 crc = _ crc_ c citt _upda te (crc , * pfrm ++);

72 }

73 while (flen - -);

75 /* toggle red led if crc is c orrect */

76 if ( crc == 0)

77 {

78 LE D _ TOGGLE (2);

79 }

81 /* wait 500 ms and indicate ready state */

82 WAIT500MS ();

83 LED_TOGG L E (1);

84 LED_TOGG L E (0);

85 }

Listing A.1: Datenempfang mit Hilfe des µracoli-Pakets

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Atmel AVR2070 Bedienungsanleitung Seite 46