Giao tiếp I2C giữa kit TIVA

[thephuong010595]

Mình đang cần thực hiện giao tiếp giữa DS1307 với Tm4C123G.
Đây là example trong TIVAWARE, không hiểu là SALVE_ADDRESS chỉ bao gồm address của Slave hay bao gồm cả bit R/S nhỉ? Ai hiểu giải đáp giùm mình với

#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_i2c.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/i2c.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"
 
//*****************************************************************************
//
// Set the address for slave module. This is a 7-bit address sent in the
// following format:
//                      [A6:A5:A4:A3:A2:A1:A0:RS]
//
// A zero in the R/S position of the first byte means that the master
// transmits (sends) data to the selected slave, and a one in this position
// means that the master receives data from the slave.
//
//*****************************************************************************
#define SLAVE_ADDRESS          0x3C
 
//*****************************************************************************
//
// Global variable to hold the I2C data that has been received.
//
//*****************************************************************************
static uint32_t g_ui32DataRx;
 
//*****************************************************************************
//
// This is a flag that gets set in the interrupt handler to indicate that an
// interrupt occurred.
//
//*****************************************************************************
static bool g_bIntFlag = false;
 
//*****************************************************************************
//
// This function sets up UART0 to be used for a console to display information
// as the example is running.
//
//*****************************************************************************
void
InitConsole(void)
{
    //
    // Enable GPIO port A which is used for UART0 pins.
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
 
    //
    // Configure the pin muxing for UART0 functions on port A0 and A1.
    // This step is not necessary if your part does not support pin muxing.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);
 
    //
    // Enable UART0 so that we can configure the clock.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
 
    //
    // Use the internal 16MHz oscillator as the UART clock source.
    //
    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);
 
    //
    // Select the alternate (UART) function for these pins.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
 
    //
    // Initialize the UART for console I/O.
    //
    UARTStdioConfig(0, 115200, 16000000);
}
 
//*****************************************************************************
//
// The interrupt handler for the for I2C0 data slave interrupt.
//
//*****************************************************************************
void
I2C0SlaveIntHandler(void)
{
    //
    // Clear the I2C0 interrupt flag.
    //
    I2CSlaveIntClear(I2C0_BASE);
 
    //
    // Read the data from the slave.
    //
    g_ui32DataRx = I2CSlaveDataGet(I2C0_BASE);
 
    //
    // Set a flag to indicate that the interrupt occurred.
    //
    g_bIntFlag = true;
}
 
//*****************************************************************************
//
// Configure the I2C0 master and slave and connect them using loopback mode.
//
//*****************************************************************************
int
main(void)
{
#if defined(TARGET_IS_TM4C129_RA0) ||                                        \
    defined(TARGET_IS_TM4C129_RA1) ||                                        \
    defined(TARGET_IS_TM4C129_RA2)
    uint32_t ui32SysClock;
#endif
    uint32_t ui32DataTx;
 
    //
    // Set the clocking to run directly from the external crystal/oscillator.
    // TODO: The SYSCTL_XTAL_ value must be changed to match the value of the
    // crystal on your board.
    //
#if defined(TARGET_IS_TM4C129_RA0) ||                                        \
    defined(TARGET_IS_TM4C129_RA1) ||                                        \
    defined(TARGET_IS_TM4C129_RA2)
    ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                      SYSCTL_OSC_MAIN |
 
}

 

[Tuất]

theo trình độ tiếng Anh hạn hẹp của mình thì address đã bao gồm 7 bit A6-A0 và 1 bit R/S ở ngoài cùng bên phải. bit R/S = 0 là send, ngược lại là receive. 0x3c = 00111100 => bit R/S = 0 => send data từ master qua slave