现在用新唐715的两个mcu进行I2C通信实验，但是主机发送了从机地址后，没有返回ack，主机就一直卡在这儿的。请问有朋友知道可能是什么原因吗？
======================master==============================
//***********************************************************************************************************
// Nuvoton Technology Corp.
// E-mail: MicroC-8bit@nuvoton.com
//***********************************************************************************************************
// Application: I2C Function(Master)
// SCL => P1.2 ; SDA => P1.3
//
// Output : P1.4 toggle when I2C function pass
//***********************************************************************************************************
//======================================== How to set I2C register ==========================================
//
// 1.I2C Frequency == Fsys/(I2CLK+1)
// Use external OSC , Fsys = 11.0592MHz
// 2.I2CEN = 1 ; enable I2C function
//===========================================================================================================
//------------------------- <<< Use Configuration Wizard in Context Menu >>> --------------------------------
//
//<o0.0..7> I2CLK<2-255>
//<o1.0..7> I2C Slave Address<160-175>
// <o2.6> UART pin Select
// <0=> Select P1.0, P1.1 as UART pin(default)
// <1=> Select P2.6, P2.7 as UART pin(28 pin only)
//-------------------------------- <<< end of configuration section >>> -------------------------------------
#include <stdio.h>
#include "N79E715.h"
#include "Typedef.h"
#include "Define.h"
#include "Common.h"
#include "Delay.h"
#include "Version.h"
#define I2C_CLOCK 29 // FSYS/(4*(I2CLK +1)) = 12M/(4*(29+1)) = 100K
#define EEPROM_SLA 0xA4
#define Uart_Port_Sel 0x00
#define EEPROM_WR 0
#define EEPROM_RD 1
#define PAGE_SIZE 32
#define ERROR_CODE 0x78
UINT32 u32Count;
//-----------------------------------------------------------------------------------------------------------
void Init_I2C(void)
{
I2CLK = I2C_CLOCK; // Set I2C clock rate
I2CEN = 1; // Enable I2C bus
// SDA = 1;
//SCL = 1;
}
//-----------------------------------------------------------------------------------------------------------
void I2C_Error(void)
{
P0 = ERROR_CODE;
while (1);
}
//-----------------------------------------------------------------------------------------------------------
void I2C_Start(void)
{
STA = 1;
//SI = 0;
// printf("i2c start before...\n");
//printf("70:status=%x\n", I2STA);
while (!(I2CON & SET_BIT3)); // Check SI set or not
//printf("i2c start after...\n");
STA = 0;
}
//-----------------------------------------------------------------------------------------------------------
void I2C_Repeat_Start(void)
{
STA = 1;
STO = 1;
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
STA = 0;
}
//-----------------------------------------------------------------------------------------------------------
void I2C_Stop(void)
{
STO = 1;
SI = 0;
while ((I2CON & 0x10) == 0x10);
}
//-----------------------------------------------------------------------------------------------------------
void I2C_Send_Address(uint8_t u8Addr_WR) // Send Slave address
{
I2DAT = u8Addr_WR;
SI = 0;
//printf("send bit3 before...\n");
//printf("97status =%x\n", I2STA);
while (!(I2CON & SET_BIT3)); // Check SI set or not
//printf("send bit3 after...\n");
}
//-----------------------------------------------------------------------------------------------------------
void I2C_EEPROM_Memory_Address(uint8_t u8HighByte,uint8_t LowByte)
{
I2DAT = u8HighByte; // Address high for I2C EEPROM
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
I2DAT = LowByte; // Address high for I2C EEPROM
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
}
//-----------------------------------------------------------------------------------------------------------
void Write_Data_To_Slave(uint8_t u8DataNum,uint8_t u8Data)
{
for (u32Count = 0; u32Count <u8DataNum; u32Count++)
{
I2DAT = u8Data;
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
u8Data = ~u8Data;
}
}
//-----------------------------------------------------------------------------------------------------------
void Read_Data_from_Slave(uint8_t u8DataNum,uint8_t u8Data)
{
for (u32Count = 0; u32Count < u8DataNum; u32Count++)
{
AA = 1;
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
if (I2DAT != u8Data)
I2C_Error();
u8Data = ~u8Data;
}
AA = 0;
SI = 0;
while (!(I2CON & SET_BIT3)); // Check SI set or not
}
//-----------------------------------------------------------------------------------------------------------
void Master_Write_Data(uint8_t u8DAT)
{
I2C_Start();
// printf("i2c send address before...\n");
I2C_Send_Address(EEPROM_SLA | EEPROM_WR);
// printf("i2c send addr after..\n");
// I2C_EEPROM_Memory_Address(0,0);
Write_Data_To_Slave(PAGE_SIZE,u8DAT);
I2C_Stop();
}
//-----------------------------------------------------------------------------------------------------------
void Master_Read_Data(uint8_t u8DAT)
{
I2C_Start();
//I2C_Send_Address(EEPROM_SLA | EEPROM_WR);
//I2C_EEPROM_Memory_Address(0,0);
//I2C_Repeat_Start();
I2C_Send_Address(EEPROM_SLA | EEPROM_RD);
Read_Data_from_Slave(PAGE_SIZE,u8DAT);
I2C_Stop();
}
//-----------------------------------------------------------------------------------------------------------
main(void)
{
AUXR1 |= Uart_Port_Sel; // Select P10/P11 as UART pin(default)
// InitialUART0_Timer1(9600); // 9600 Baud Rate [url=home.php?mod=space&uid=72445]@[/url] 11.0592MHz
/* Show_Version_Number_To_PC();
printf ("\n*==========================================================================");
printf ("\n* N79E715 Series I2C Interrupt Sample Code. (N79E715_M <--> N79E715_S)");
printf ("\n*==========================================================================\n");
printf ("\nI2C Demo Start...\n");
*/
Init_I2C(); // I2C function Initialize
while(1)
{
Master_Write_Data(0x55);
Master_Read_Data(0x55);
Delay1ms(1000);
}
// printf("\nI2C Test OK!");
while (1) // Test OK
{
P14 = 1;
P21 = 1;
Delay1ms(500);
P14 = 0;
P21 = 0;
Delay1ms(500);
}
}
//-----------------------------------------------------------------------------------------------------------
======================slave============================
/*---------------------------------------------------------------------------------------------------------*/
/* */
/* Copyright(c) 2015 Nuvoton Technology Corp. All rights reserved. */
/* */
/*---------------------------------------------------------------------------------------------------------*/
//***********************************************************************************************************
// Nuvoton Technology Corp.
// E-mail: MicroC-8bit@nuvoton.com
//***********************************************************************************************************
// Application: I2C Function(Slave)
// SCL => P1.2 ; SDA => P1.3
//
// Output : I2C status => P0
// **********************************************************************************************************
#include <stdio.h>
#include "N79E715.h"
#include "Typedef.h"
#include "Define.h"
#include "Common.h"
#include "Delay.h"
#include "Version.h"
#define Slave_Address 0xA4
uint8_t u8Data_Received[34], u8Data_Num = 0;
//-----------------------------------------------------------------------------------------------------------
void i2c_isr(void) interrupt 6
{
switch (I2STA)
{
case 0x00:
STO = 1;
break;
case 0x60: /*60H, own SLA+W received, ACK returned*/
AA = 1;
//P0 = 0x60;
break;
case 0x80:
P0 = 0x80;
u8Data_Received[u8Data_Num] = I2DAT;
u8Data_Num++;
if (u8Data_Num == 34)
AA = 0;
else
AA = 1;
break;
case 0x88:
P0 = 0x88;
u8Data_Received[u8Data_Num] = I2DAT;
u8Data_Num = 0;
AA = 1;
break;
case 0xA0:
P0 = 0xA0;
AA = 1;
break;
case 0xA8:
P0 = 0xA0;
I2DAT = u8Data_Received[u8Data_Num];
u8Data_Num++;
AA = 1;
break;
case 0xB8:
P0 = 0xB8;
I2DAT = u8Data_Received[u8Data_Num];
u8Data_Num++;
AA = 1;
break;
case 0xC0:
P0 = 0xC0;
AA = 1;
break;
case 0xC8:
P0 = 0xC8;
AA = 1;
break;
}
SI = 0;
while(STO);
}
//-----------------------------------------------------------------------------------------------------------
void Init_I2C(void)
{
SDA = 1; // Set SDA and SCL pins high
SCL = 1;
P3M1 |= SET_BIT5; // Enable P1 Schmitt trigger input
EI2C = 1; // Enable I2C interrupt by setting EIE bit 0
EA = 1;
I2ADDR = Slave_Address; // Define own slave address
I2CEN = 1; // Enable I2C circuit
AA = 1;
}
//-----------------------------------------------------------------------------------------------------------
void main(void)
{
int i = 0;
// InitialUART0_Timer1(9600); // 9600 Baud Rate @ 11.0592MHz
/* Show_Version_Number_To_PC();
printf ("\n*==========================================================================");
printf ("\n* N79E715 Series I2C Slave Interrupt Sample Code. (N79E715_M <--> N79E715_S)");
printf ("\n*==========================================================================\n");
*/
Init_I2C(); // Initialize I2C function
// printf ("\nI2C Slave Start Receive...\n");
while(1);
/* while(1)
{
for(i = 0; i < 34; ++i)
{
printf("reve[%d] = %x\n", i, u8Data_Received[i]);
}
//printf("i = %x\n", i);
printf("-----------------------------------------------------\n");
Delay1ms(2000);
}*/
}
//-----------------------------------------------------------------------------------------------------------
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