1 | #include "LPC214X.H" /* LPC214x definitions */
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2 |
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3 | #define SPI_SEL 0x00100000
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4 |
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5 | /* SPI and MMC commands related modules. */
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6 | void SPI_Init( void )
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7 | {
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8 | unsigned long portConfig;
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9 | volatile unsigned char i, Dummy;
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10 |
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11 | SSPCR1 = 0x00; /* SSP master (off) in normal mode */
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12 | portConfig = PINSEL1;
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13 | PINSEL1 = portConfig | 0x02A8;
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14 | IODIR0 = SPI_SEL; /* SSEL is output */
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15 | IOSET0 = SPI_SEL; /* set SSEL to high */
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16 | VPBDIV = 0x04;
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17 | /* Set data to 8-bit, Frame format SPI, CPOL = 0, CPHA = 1, and SCR is 7 */
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18 | SSPCR0 = 0x0787; // CPHA = 1;
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19 | SSPCPSR = 0x20; /* SSPCPSR clock prescale register */
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20 | SSPCR1 = 0x02; /* Device select as master, SSP Enabled, normal operational mode */
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21 |
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22 | for ( i = 0; i < 8; i++ )
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23 | {
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24 | Dummy = SSPDR; /* clear the RxFIFO */
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25 | }
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26 | return;
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27 | }
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28 |
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29 | /* SPI Send a block of data based on the length */
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30 | void SPI_Send( unsigned char *buf, unsigned long Length )
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31 | {
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32 | volatile unsigned char Dummy;
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33 |
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34 | if (Length == 0 ) return;
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35 | while ( Length != 0 )
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36 | {
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37 | while ((SSPSR & 0x02) == 0); /* wait if SPI transmit buffer full */
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38 | SSPDR = *buf;
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39 | while ( !(SSPSR & 0x04) ); /* Wait until the Busy bit is cleared */
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40 | Dummy = SSPDR; /* Flush the RxFIFO */
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41 | Length--;
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42 | buf++;
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43 | }
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44 | return;
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45 | }
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46 |
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47 |
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48 | unsigned char SPI_ReceiveByte( void )
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49 | {
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50 | unsigned char data;
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51 |
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52 | SSPDR = 0xFF; // Write
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53 | while (((SSPSR & 0x10) != 0) ); // wait until busy flag is cleared
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54 | data = SSPDR;
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55 | return ( data );
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56 | }
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57 |
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58 |
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59 | /* SPI receives a block of data based on the length */
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60 | void SPI_Receive(unsigned char *buf, unsigned long Length)
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61 | {
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62 | unsigned long i;
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63 | volatile unsigned char a;
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64 |
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65 | /* clear input buffer has no effect
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66 | volatile unsigned char Dummy;
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67 | for ( i = 0; i < 8; i++ )
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68 | {
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69 | Dummy = SSPDR; //clear the RxFIFO
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70 | }
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71 | */
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72 |
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73 | for (i = 0; i < Length; i++ )
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74 | {
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75 | *buf = SPI_ReceiveByte();
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76 | buf++;
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77 | }
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78 | return;
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79 | }
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80 |
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81 |
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82 | void Delay(unsigned long Delay)
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83 | {
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84 | volatile unsigned long i;
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85 |
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86 | i= Delay*30;
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87 | while ((i--) > 0);
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88 | }
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89 |
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90 |
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91 | int main(void)
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92 | {
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93 | unsigned char OutBuf[] = {0x24,0x02,0x02,0xAA,0xBB,0xCC};
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94 | unsigned char InBuf[20];
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95 | int i;
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96 |
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97 | SPI_Init();
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98 | while (1==1)
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99 | {
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100 | for (i=0;i<20;i++)
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101 | InBuf[i] = 0;
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102 |
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103 | SPI_Send(OutBuf,6);
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104 | Delay(50000UL);
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105 | SPI_Receive(InBuf,9);
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106 | Delay(1000);
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107 | }
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108 | }
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