DSP

DSP 之I2C（Inter IC BUS)总线

2019-07-13 09:55发布

站内文章 / DSP
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DSP之 I2C（InterIC BUS)总线介绍： IIC总线介绍请看这: IIC接口: TMS320C550A包含IIC串口，可工作在100-400Kbps波特率之间，7位地址模式，该芯片包含主发送/接收和副发送/接收模式，可应用于DMA,中断，或者轮询事件。 IIC的时钟模式工作范围为7MHZ-12MHZ。   /* * Copyright (C) 2003 Texas Instruments Incorporated * All Rights Reserved */ #include #include #include #include "myiic.h" //---------Global data definition--------- Uint16 mask = 1; Uint16 enable = 1; Uint16 databyte1[2]={0xA,0xB}; int i=0,x; Uint16 datareceive[6] = { 0, 0, 0, 0, 0, 0 }; int y; /* Declare and Initialize an I2C */ I2C_Init myInit = { 0, /* 7 bit address mode */ 0x0000, /* own address */ 144, /* clkout value (MHZ) */ 400, /* a number between 10 and 400 */ 0, /* 8 bits/byte to be received or transmitted */ 0, /* DLB mode off */ 1 /* FREE mode on */ }; /* Declare and Initialize an I2C call Back Structure */ I2C_IsrAddr addr = { myALIsr, myNACKIsr, myARDYIsr, myRRDYIsr, myXRDYIsr }; /* Declare and Initialize an I2C initialization structure */ I2C_Setup Init = { 0, /* 7 bit address mode */ 0x0020, /* own address - don't care if master */ 144, /* clkout value (Mhz) */ 400, /* a number between 10 and 400*/ 0, /* number of bits/byte to be received or transmitted (8)*/ 0, /* DLB mode on*/ 1 /* FREE mode of operation on*/ }; //---------Function prototypes--------- /* Reference start of interrupt vector table */ /* This symbol is defined in the file, vectors.s55 */ extern void VECSTART(void); #pragma CODE_SECTION (taskFunc, "tskSeg"); void taskFunc(void); void UserMe(void) { I2C_init(&myInit); y = I2C_read(datareceive, /* data buffer */ 6, /* receives 6 of bytes of data */ 1, /* in master receiver */ 0x50, /* S-A-D..(n) D-P mode */ 3, /* to from the 0x50 address */ 30000, /* with a timeout of 30000 */ 0); /* and check for bus busy on */ printf("I2C read: %d ", y); } //---------main routine--------- void main(void) { /* Initialize CSL library - This is REQUIRED !!! */ CSL_init(); /* Set IVPD/IVPH to start of interrupt vector table */ /* 设置中断向量表 */ IRQ_setVecs((Uint32)(&VECSTART)); /* Call I2C example task/function */ taskFunc(); } void taskFunc(void) { /* Initialize the I2C using the iniitalization structure values */ I2C_setup(&Init); /* Set call back functions for I2C interrupt events * IIC structure used to assign functions for each interrupt structure * hook up the interrupt functions */ I2C_setCallback(&addr); /* Enable RRDY interrupt * Data Receive Ready Interrupt */ I2C_eventEnable(I2C_EVT_RRDY); /* Enable all maskable interrupts */ IRQ_globalEnable(); // Enable interrupts /* Write a data byte to I2C */ x=I2C_write(databyte1, /* data buffer */ 1, /* send 1 bytes data */ 1, /* in master transmitter */ 0x20, /* to the 0x50 slave */ 1,30000); /* address with a timeout of 30000 */ if(!x) printf (" TEST PASSED "); else printf (" TEST FAILED "); /* Give some time for interrupt to occur */ for(i=0;i<10000;i++){ }; }
  #ifndef MYIIC_H_ #define MYIIC_H_ extern void myALIsr(void); extern void myNACKIsr(void); extern void myARDYIsr(void); extern void myRRDYIsr(void); extern void myXRDYIsr(void); #endif /*MYIIC_H_*/
  /* * Copyright (C) 2003 Texas Instruments Incorporated * All Rights Reserved */ /* *---------myIsrs_i2c1.c--------- * Function definitions for ISR/callBack functions */ #include /* 将函数数据放在名为myisrSeg的代码段中 */ #pragma CODE_SECTION (myALIsr,"myisrSeg"); #pragma CODE_SECTION (myNACKIsr,"myisrSeg"); #pragma CODE_SECTION (myARDYIsr,"myisrSeg"); #pragma CODE_SECTION (myRRDYIsr,"myisrSeg"); void myALIsr() { printf("I2C Arbitration Interrupt Occurred "); // NOP 指令占一个字节，无实际意义 asm(" NOP ;====> I2C periodic interrupt routine"); } void myNACKIsr() { printf("I2C NACK Interrupt Occurred "); asm(" NOP ;====> I2C periodic interrupt routine"); } void myARDYIsr() { printf("I2C ARDY Interrupt Occurred "); asm(" NOP ;====> I2C periodic interrupt routine"); } void myRRDYIsr() { printf("I2C RRDY Interrupt Occurred "); asm(" NOP ;====> I2C periodic interrupt routine"); } void myXRDYIsr() { printf("I2C XRDY Interrupt Occurred "); asm(" NOP ;====> I2C periodic interrupt routine"); }
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