DSP 之I2C（Inter IC BUS)总线
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\n", 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 ("\nTEST PASSED\n");
else printf ("\nTEST FAILED\n");
/* 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\n");
// NOP 指令占一个字节，无实际意义
asm("\tNOP ;====> I2C periodic interrupt routine");
}
void myNACKIsr()
{
printf("I2C NACK Interrupt Occurred\n");
asm("\tNOP ;====> I2C periodic interrupt routine");
}
void myARDYIsr()
{
printf("I2C ARDY Interrupt Occurred\n");
asm("\tNOP ;====> I2C periodic interrupt routine");
}
void myRRDYIsr()
{
printf("I2C RRDY Interrupt Occurred\n");
asm("\tNOP ;====> I2C periodic interrupt routine");
}
void myXRDYIsr()
{
printf("I2C XRDY Interrupt Occurred\n");
asm("\tNOP ;====> I2C periodic interrupt routine");
}