I2C0 code not working for stellaris LM4F232H5QD

Atul Tawalare

Hi,

I trying to configure I2C0 communication between LM4F232H5QD and audio controller. I have to configure controller as master.

I have to send two bytes to Audio controller and read 1 byte from the same. My I2C0 code is not working, please help. it's urgent. my code is as follows.

If any one has working I2C0 code for LM4F232H5QD please share it. (Xtal freq = 16MHz)

#include "hw_memmap.h"
#include "hw_types.h"
#include "sysctl.h"
#include "gpio.h"
#include "i2c.h"
#include "hw_i2c.h"
#include "lm4f232h5qd.h"

#define SLAVE_ADDRESS 0xC0

void InitSystem(void);

int main(void)
{
unsigned long ulRecData;
unsigned long ulMasterData[2] = {0x00, 0xAA};

InitSystem();

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, false);

I2CMasterDataPut(I2C0_MASTER_BASE, ulMasterData[0]);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);

while(I2CMasterBusBusy(I2C_MASTER_BASE))
{
}

I2CMasterDataPut(I2C0_MASTER_BASE, ulMasterData[1]);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);

while(I2CMasterBusBusy(I2C_MASTER_BASE))
{
}

/* Read the data */

I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SLAVE_ADDRESS, true);

I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);

while(I2CMasterBusBusy(I2C_MASTER_BASE))
{
}

ulRecData = I2CMasterDataGet(I2C0_MASTER_BASE);
}

void InitSystem(void)
{

/* Set the clock to run directly from the external crystal/oscillator. */
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC |
SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

/* Enable I2C0 peripheral. */
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);

/* I2C0 is used with port B[3:2]. GPIO port B is enabled. */
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

    /*
     * Configure the pin muxing (alternate function of pins)
     * for I2C0 functions on port B2 and B3.
     *
     * By default on reset PB2 and PB3 are configured for I2C
     * functionality.
     */

GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);

    /*
     * Select the I2C function for these pins.
     */

GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3);

I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(), false);
}

over 13 years ago

0 cb1_mobile over 13 years ago

Guru 117855 points

Quickly - several things: (this an extract from our working LM4F231 I2C1 - easily adapted to your I2C0)

        GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_6);       //   required by the new M4F - your code has been superceded
        ROM_GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_7);

        ROM_GPIOPinConfigure(GPIO_PA6_I2C1SCL);     // your code looks ok here
        ROM_GPIOPinConfigure(GPIO_PA7_I2C1SDA);

Unless you have multiple masters - replace your while "tests"

while(I2CMasterBusBusy(I2C_MASTER_BASE))
{
}

with:

while(ROM_I2CMasterBusy(I2C1_MASTER_BASE)) {} // this is what you want to monitor activity on the I2C bus for single master

Haven't time to perform full/detail read of your code - believe suggestions here will get you very close - if not operational! If not - provide detail bit beyond, "not working" - that is essentially worthless to those seeking to aid... Your equally urgent "verified answer" tick is appreciated...

0 Norman Wong over 13 years ago

Guru 26430 points

Just a guess. I'm thought I2CMasterSlaveAddrSet() acccepted a 7 bit address. The value of 0xC0 implies a 8 bit address. Maybe try 0x60 instead.

0 cb1_mobile over 13 years ago in reply to Norman Wong

Guru 117855 points

Poster Wong is indeed correct - suggest you list for us the requested slave address (from slave data) so that multiple eyes may review. 0xC0 will not work!

0 Atul Tawalare over 13 years ago in reply to cb1_mobile

Prodigy 30 points

thank you very much

Now my code is working

0 Atul Tawalare over 13 years ago in reply to cb1_mobile

Prodigy 30 points

cb1_mobile thank you very much

0 cb1_mobile over 13 years ago in reply to Atul Tawalare

Guru 117855 points

Thank you - glad to have assisted. Suspect that you will eventually require the passage of more than 2 bytes via I2C. My post describes:

http://e2e.ti.com/support/microcontrollers/stellaris_arm_cortex-m3_microcontroller/f/471/t/168281.aspx

Perhaps a "verified answer" tick is justified?

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Arm-based microcontrollers forum

I2C0 code not working for stellaris LM4F232H5QD