MSP430G2232 硬件I2C配置问题

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MSP430G2232 硬件I2C配置问题 [复制链接]

MSP430G2232的实际寄存器和《MSP430x2xx Family User's Guide》（ slau144j.pdf）这个系列用户手册中的描述完全不一样无法参考，导致在使用I2C通讯的时候不知道如何配置相关寄存器。

请问是否有MSP430G2232  硬件IIC的配置说明？

下面是我按照例官网程写的通过IIC向slave地址为0xAE的设备的Register写入值的函数，请帮忙确认一下下面配置是否有问题。

1. void I2C_WRITE(int add,int data)
   
2. 
   
3. {
   
4. 
   
5. P1OUT |=BIT6+BIT7;
   
6. P1REN |= BIT6+BIT7;
   
7. P1DIR |=BIT6+BIT7;
   
8. 
   
9. //SDA和SCL有电阻上拉到VCC，是否还需要上面的设置？
   
10. 
    
11. //following is setting for I2C
    
12. 
    
13. USICTL0 |= USISWRST;//RESET
    
14. USICTL0 |= USIPE6+USIPE7+USIMST ;//P1.6&P1.7 For IIC+MASTER MODE
    
15. USICTL1 |= USII2C;//I2C MODE
    
16. USICKCTL =USIDIV_3+USISSEL_2+USICKPL;
    
17. 
    
18. USICTL0 &= ~USISWRST;//CLEAR RESET BIT
    
19. 
    
20. //START
    
21. USISRL =0x00;
    
22. USICTL0 |= USIGE+USIOE;
    
23. USICTL0 &=~USIGE;
    
24. 
    
25. //following is for slave address and write/read select
    
26. USISRL =0xAE;//slave Address 0XAE,write bit 0
    
27. USICNT =0x08;//8bit
    
28. while(USICTL1&USIIFG==0);//waiting for all 8 bits shift out
    
29. ACK_CHECK();
    
30. 
    
31. USISRL = add;//register Address
    
32. USICNT =0x08;//8bit
    
33. while(USICTL1&USIIFG==0);
    
34. ACK_CHECK();
    
35. 
    
36. USISRL = data;//data
    
37. USICNT =0x08;//8bit
    
38. ACK_CHECK();
    
39. 
    
40. //STOP
    
41. USICTL0|=USIOE;//SDA=OUTPUT
    
42. USISRL = 0X00;//MSB=0;
    
43. USICNT |=0x01;//USICNT =1 BIT
    
44. while (USICTL1&USIIFG==0);//WAITING FOR TRANS COMPLETE
    
45. USISRL &= 0xff;//USISRL =1 to drive SDA high
    
46. USICTL0 |=USIGE;//TRANSPARENT LATCH EN
    
47. USICTL0 &=~(USIGE+USIOE);//LATCH/SDA output disable
    
48. 
    
49. }
    
50. 
    
51. void ACK_CHECK(void)
    
52. {
    
53. // following is for ACK check
    
54. USICTL0 &= ~USIOE;//INPUT
    
55. USICNT =0X01;//1bit ack
    
56. while(USICTL1&USIIFG==0);//waiting for ACK
    
57. if(USISRL&0X01==1)// if NACK stop
    
58. {
    
59. I2C_ERROR =1;
    
60. }
    
61. else
    
62. {
    
63. I2C_ERROR =0;
    
64. }
    
65. 
    
66. USICTL0 |= USIOE; //enable output
    
67. }

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