DM6467 about i2c driver

leo wang

Hello specialist:

I now have used dm6467 platform.i want to acheve i2c as slave driver,while i know it 's as master in the most of time for linux os. I want to use it as slave device,can be used External devices as master. how to do it?

regards

Leo

13 年多前

0 VampireDaVinci 13 年多前

Genius 4245 points

1. sure , plz. check www.ti.com/.../spruer0d.pdf

0 leo wang 13 年多前回复 VampireDaVinci

Prodigy 70 points

我中文说吧，我现在的方案中 DM6467作为从机要和外部的主机通信，通过I2C，我看了6467的I2C linux驱动似乎只支持dm6467作为主机，然后我现在绕过驱动，直接操作寄存器初始化为从机，初始化部分有什么问题麻烦看一下：

然后

void i2c_init(int speed, int slaveadd)

{

u_int32_t div, psc;

step 1

ICMDR-IRS

clear IRS=0;

REG(I2C_CON) = 0;

usleep(80000);

printf("I2c--->Reset: [0x%lx] \n",REG(I2C_CON));

step2

ICMDR-XA

set xa for 7bit adress

REG(I2C_OA) = slaveadd;

REG(I2C_SA) =slaveadd;

printf("I2c--->Slave: [0x%lx] \n",REG(I2C_OA));

REG(I2C_CNT) =0;

step3

ICIMR AAS=1 ICRRDY=1 ICXRDY=1 SCD=1

set interrupt bit

/* Interrupts must be enabled or I2C module won't work */

REG(I2C_IE) = I2C_IE_SCD_IE | I2C_IE_XRDY_IE |

I2C_IE_RRDY_IE |I2C_IE_AAS_IE ;

printf("I2c--->IE: [0x%lx] \n",REG(I2C_IE));

step4

CONFIG_SYS_HZ_CLOCK =990M;

speed=400Hz （主要是主机是模拟的）

psc = 8;

div = (CONFIG_SYS_HZ_CLOCK / ((psc + 1) * speed)) - 10;

printf("div: %d \n",div);

REG(I2C_PSC) = psc;

REG(I2C_SCLL) = (div * 50) / 100;

REG(I2C_SCLH) = div - REG(I2C_SCLL);

step5

ICMDR MST=0 FDF=0 BC=0 DLB=0 STB=0 RM=1 STP=0 STT=1

set mod register

/* Now enable I2C controller (get it out of reset) */

REG(I2C_CON) = I2C_CON_RM | I2C_CON_STT ;

REG(I2C_CON) = I2C_CON_EN | REG(I2C_CON);

printf("I2c--->MDR: [0x%lx] \n",REG(I2C_CON));

}