CC2652RB: How to realize I2C slave from empty example

junde deng

Intellectual 280 points

Part Number: CC2652RB

Hi ti:

I am working in simplelink_cc13x2_26x2_sdk_4_30_00_54 with LP_CC2652RB.

I want to realize a I2C slave project, but there is no example in SDK. So I try to do it by dreverlib.

Following is my parts of code, that I call init_i2c() in empty's mainThread().

#include <i2c.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>

#define I2C0_SCL0          IOID_4
#define I2C0_SDA0          IOID_5

void init_i2c(void)
{
    //PRCMPowerDomainOn(PRCM_DOMAIN_PERIPH);
    
    Power_setDependency(PowerCC26XX_PERIPH_I2C0);
    
    //PRCMLoadSet();
    //PRCMPeripheralRunEnable(PRCM_PERIPH_I2C0); // Enable I2C module
    //PRCMPeripheralRunEnable(PRCM_PERIPH_GPIO);
    //PRCMLoadSet();

    I2CSlaveInit(I2C0_BASE, 0x53);
    I2CIntRegister(I2C0_BASE, i2c_callback);
    I2CSlaveIntEnable(I2C0_BASE, I2C_SLAVE_INT_START | I2C_SLAVE_INT_STOP | I2C_SLAVE_INT_DATA);
}

void i2c_callback(void)
{
    uint32_t val;
    uint32_t status = I2CSlaveIntStatus(I2C0_BASE, true);
    I2CSlaveIntClear(I2C0_BASE, status);

    if(status & I2C_SLAVE_INT_DATA)
    {
        status = I2CSlaveStatus(I2C0_BASE);

        if(status & I2C_SLAVE_ACT_RREQ)
        {
            val = I2CSlaveDataGet(I2C0_BASE);
            GPIO_toggle(CONFIG_GPIO_LED_0);
        }
    }
}

However, when I run i2copt3001 example to test the I2C slave project. the red_led dose NOT blink(implicit I2C get some data), but the green_led work normal(implicit mainThread() work well).

So I'm here for asking your help:

1. How to realize a I2C slave by CC2652RB, is there some documents can be referred?

2. In my above code, there is some commented lines like PRCMxxx(), I can't find define of them, where are them?

3. Actually from my code, I am NOT maping the GPIO to I2C since I do not know how to do it. Could you show me how to map the specific GPIO for SCL and SDA function?

Thanks very much for your help!

over 3 years ago

0 junde deng over 3 years ago

Intellectual 280 points

Hi there,

I have try some code as following and seems work well.

#include <i2c.h>
#include <prcm.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>

#define I2C0_SCL0          IOID_4
#define I2C0_SDA0          IOID_5

void init_i2c(void);
void i2c_callback(void);

PIN_State i2cPinState;      // Must reside in persistent memory

void init_i2c(void)
{
    PRCMPowerDomainOn(PRCM_DOMAIN_PERIPH);

    // Set Power dependecies & constraints
    Power_setDependency(PowerCC26XX_PERIPH_I2C0);
    Power_setDependency(PowerCC26XX_PERIPH_GPIO);

    // Set constraints for Standby, powerdown and idle mode
    Power_setConstraint(PowerCC26XX_SB_DISALLOW);
    Power_setConstraint(PowerCC26XX_IDLE_PD_DISALLOW);

    PRCMLoadSet();
    PRCMPeripheralRunEnable(PRCM_PERIPH_I2C0); // Enable I2C module
    PRCMPeripheralRunEnable(PRCM_PERIPH_GPIO);
    PRCMLoadSet();

    PIN_Config i2cPinTable[] = {
        I2C0_SDA0 | PIN_INPUT_EN | PIN_PULLUP | PIN_OPENDRAIN,
        I2C0_SCL0 | PIN_INPUT_EN | PIN_PULLUP | PIN_OPENDRAIN,
        PIN_TERMINATE
    };

    PIN_Handle i2cPinHandle = PIN_open(&i2cPinState, i2cPinTable);
    if (    (PIN_SUCCESS == PINCC26XX_setMux(i2cPinHandle, I2C0_SCL0, IOC_PORT_MCU_I2C_MSSCL)) &&
            (PIN_SUCCESS == PINCC26XX_setMux(i2cPinHandle, I2C0_SDA0, IOC_PORT_MCU_I2C_MSSDA))      )
    {
        DBG_INFO("I2C PIN set succ.");
    } else {
        DBG_INFO("I2C PIN set failed.");
    }

    I2CSlaveInit(I2C0_BASE, 0x53);

    I2CIntRegister(I2C0_BASE, i2c_callback);
    I2CSlaveIntEnable(I2C0_BASE, I2C_SLAVE_INT_START | I2C_SLAVE_INT_STOP | I2C_SLAVE_INT_DATA);
}

void i2c_callback(void)
{
    uint32_t val;
    uint32_t status = I2CSlaveIntStatus(I2C0_BASE, true);
    I2CSlaveIntClear(I2C0_BASE, status);

    if(status & I2C_SLAVE_INT_DATA)
    {
        status = I2CSlaveStatus(I2C0_BASE);

        if(status & I2C_SLAVE_ACT_RREQ)
        {
            val = I2CSlaveDataGet(I2C0_BASE);
            GPIO_toggle(CONFIG_GPIO_LED_0);
        }
    }
}

BTW, I also add include path in properties as below:

And the PRCMxxx() is reside in simplelink_cc13x2_26x2_sdk_4_30_00_54\source\ti\devices\cc13x2_cc26x2\driverlib.

0 Ryan Brown1 over 3 years ago in reply to junde deng

TI__Guru**** 218697 points

Hi junde,

Thank you for providing the solution to your issue in detail!

Regards,
Ryan

0 junde deng over 3 years ago in reply to Ryan Brown1

Intellectual 280 points

Hi Ryan,

I meet another question about I2C slave project.

I modify above code to below:

#include <i2c.h>
#include <prcm.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>

#define I2C0_SCL0          IOID_4
#define I2C0_SDA0          IOID_5
#define SLAVE_ADDR         0x11

void init_i2c(void);
void i2c_callback(void);

PIN_State i2cPinState;      // Must reside in persistent memory
volatile uint8_t i2c_read_cnt;
volatile uint32_t i2c_read_buf[20];

void *mainThread(void *arg0)
{
    GPIO_init();
    DBG_INIT();
    GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
    GPIO_setConfig(CONFIG_GPIO_LED_1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
    GPIO_write(CONFIG_GPIO_LED_1, CONFIG_GPIO_LED_ON);

    DBG_INFO("/********** Program Start ***********/");

    init_i2c();

    while (1) {
        if(i2c_read_cnt != 0)
        {
            GPIO_toggle(CONFIG_GPIO_LED_1);

            DBG_INFO("I2C get data: [%d]", i2c_read_cnt);

            uint8_t i;
            for(i = 0; i < i2c_read_cnt; i++)
            {
                DBG_INFO("test1");
//                DBG_INFO("[%d] = 0x%08x", 0, 0);
//                DBG_INFO("[%d] = 0x%08x", i, i2c_read_buf[i]);
            }

            DBG_INFO("test2");
            i2c_read_cnt = 0;
        }
    }
}

void init_i2c(void)
{
    PRCMPowerDomainOn(PRCM_DOMAIN_PERIPH);

    // Set Power dependecies & constraints
    Power_setDependency(PowerCC26XX_PERIPH_I2C0);
    Power_setDependency(PowerCC26XX_PERIPH_GPIO);

    // Set constraints for Standby, powerdown and idle mode
    Power_setConstraint(PowerCC26XX_SB_DISALLOW);
    Power_setConstraint(PowerCC26XX_IDLE_PD_DISALLOW);

    PRCMLoadSet();
    PRCMPeripheralRunEnable(PRCM_PERIPH_I2C0); // Enable I2C module
    PRCMPeripheralRunEnable(PRCM_PERIPH_GPIO);
    PRCMLoadSet();

    PIN_Config i2cPinTable[] = {
        I2C0_SDA0 | PIN_INPUT_EN | PIN_PULLUP | PIN_OPENDRAIN,
        I2C0_SCL0 | PIN_INPUT_EN | PIN_PULLUP | PIN_OPENDRAIN,
        PIN_TERMINATE
    };

    PIN_Handle i2cPinHandle = PIN_open(&i2cPinState, i2cPinTable);
    if (    (PIN_SUCCESS == PINCC26XX_setMux(i2cPinHandle, I2C0_SCL0, IOC_PORT_MCU_I2C_MSSCL)) &&
            (PIN_SUCCESS == PINCC26XX_setMux(i2cPinHandle, I2C0_SDA0, IOC_PORT_MCU_I2C_MSSDA))      )
    {
        DBG_INFO("I2C PIN set succ.");
    } else {
        DBG_INFO("I2C PIN set failed.");
    }

    I2CSlaveInit(I2C0_BASE, SLAVE_ADDR);
    I2CIntRegister(I2C0_BASE, i2c_callback);
    I2CSlaveIntEnable(I2C0_BASE, I2C_SLAVE_INT_START | I2C_SLAVE_INT_STOP | I2C_SLAVE_INT_DATA);
}

void i2c_callback(void)
{
    i2c_read_cnt = 0;
    uint32_t status = I2CSlaveIntStatus(I2C0_BASE, true);
    I2CSlaveIntClear(I2C0_BASE, status);

    if(status & I2C_SLAVE_INT_DATA)
    {
        //status = I2CSlaveStatus(I2C0_BASE);

        while( I2CSlaveStatus(I2C0_BASE) & I2C_SLAVE_ACT_RREQ)
        {
            i2c_read_buf[i2c_read_cnt++] = I2CSlaveDataGet(I2C0_BASE);
            GPIO_toggle(CONFIG_GPIO_LED_0);
        }
    }
}

When I run i2copt3001 example to test the I2C slave, the XDS110 output as following:

/********** Program Start ***********/
I2C PIN set succ.
I2C get data: [1]
test2

YES, there is NO test1 output... I can't understand it, could you help me?

Thanks!

0 junde deng over 3 years ago in reply to junde deng

Intellectual 280 points

Hi,

I find that i2c_read_cnt is changed by i2c_callback(), I fix the bug and post at here for your infomation: gitee.com/.../i2c-interactive.git

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CC2652RB: How to realize I2C slave from empty example