STC8H8K64U与ESP32/Arduino的IIC通信问题
STC8H8K64U与ESP32/Arduino的新结合！！最近研究STC8K8K64U与ESP32的主从IIC通信，以STC8H8K64U作为IIC从机接收ESP32（IIC主机）发送的消息。
目前遇到的问题是：STC8K8K64U接收到的消息与ESP32发送的消息不一致。
如下图所示：
测试结果发现：STC8H8K64U接收到的消息是ESP32发送消息*2的内容，但当发送的数据是3位数后，STC接收到的数据是后2位数的结果。
ESP32采用ArduinoIDE编程，SCL->IO22, SDA->IO23，通过Serial0查看发送的消息，ESP32端代码如下：
/**
* 这是主机的程序
*/
#include <Wire.h>
int num = 1; //用来发送给从机
int address = 0x5a; //从机地址
void setup() {
Serial.begin(115200);
if(Wire.begin()) //主机加入I2C总线中
Serial.println("i2c success");
else
Serial.println("i2c failed");
}
void loop() {
//向从机发送数据
char tmp;
num=num+1;
itoa(num, tmp, 10);//将数字转换成字符串
Wire.beginTransmission(address);
Wire.write(num); //传送数字字符串
Serial.println(num);
int ret = Wire.endTransmission();
if(ret != 0)
{
Serial.printf("send failed: %d\r\n", ret);
return;
}
STC8K8K64U采用keil5编程，SCL->P3.2, SDA->P3.3，时钟 24MHz，通过USB转TTL模块接STC8K8K64U的3.0 3.1引脚查看接收到的消息，STC8K8K64U端代码如下：
#include "reg51.h"
#include "intrins.h"
#include "stdio.h"
#define MAIN_Fosc 24000000L //定义主时钟
#define Baudrate 115200L
#define TM (65536 -(MAIN_Fosc/Baudrate/4))
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
sfr INT_CLKO = 0x8F;
sfr AUXR = 0x8E;
sfr AUXR1 = 0xA2;
sfr P_SW1 = 0xA2;
sfr P_SW2 = 0xBA;
sfr TH2= 0xD6;
sfr TL2= 0xD7;
sfr IE2 = 0xAF;
sfr P1M1 = 0x91; //PxM1.n,PxM0.n =00--->Standard, 01--->push-pull
sfr P1M0 = 0x92; // =10--->pure input,11--->open drain
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xB1;
sfr P3M0 = 0xB2;
sfr P4M1 = 0xB3;
sfr P4M0 = 0xB4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;
sfr P6 = 0xE8;
sfr P7 = 0xF8;
#define I2CCFG (*(unsigned char volatile xdata *)0xfe80)
#define I2CMSCR (*(unsigned char volatile xdata *)0xfe81)
#define I2CMSST (*(unsigned char volatile xdata *)0xfe82)
#define I2CSLCR (*(unsigned char volatile xdata *)0xfe83)
#define I2CSLST (*(unsigned char volatile xdata *)0xfe84)
#define I2CSLADR (*(unsigned char volatile xdata *)0xfe85)
#define I2CTXD (*(unsigned char volatile xdata *)0xfe86)
#define I2CRXD (*(unsigned char volatile xdata *)0xfe87)
#define I2CMSAUX (*(unsigned char volatile xdata *)0xfe88)
#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中断频率, 1000次/秒
#define Baudrate1 115200L
#define UART1_BUF_LENGTH 64
/*************本地变量声明 **************/
u8TX1_Cnt; //发送计数
u8RX1_Cnt; //接收计数
bit B_TX1_Busy; //发送忙标志
u8xdata RX1_Buffer; //接收缓冲
bit isda; //设备地址标志
bit isma; //存储地址标志
bit B_1ms; //1ms标志
bit DisplayFlag;
u8 addr;
u8 Rx_Cnt;
u8 Tx_Cnt;
u8 RxBuffer;
u16 Test_cnt; //测试用的秒计数变量
u8 code TxBuf0 = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};
u8 code TxBuf1 = {0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18};
u8 code TxBuf2 = {0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28};
u8 code TxBuf3 = {0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38};
u8 code TxBuf4 = {0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48};
u8 code TxBuf5 = {0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58};
u8 code TxBuf6 = {0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68};
u8 code TxBuf7 = {0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78};
void WriteNbyte(u8 addr, u8 *p, u8 number);
void UART1_config(u8 brt); // 选择波特率, 2: 使用Timer2做波特率, 其它值: 使用Timer1做波特率.
void UartPutc(unsigned char dat)
{
B_TX1_Busy = 1;
SBUF = dat;
while(B_TX1_Busy);
}
char putchar(char c)
{
UartPutc(c);
return c;
}
void I2C_Isr() interrupt 24
{
char store;
store = P_SW2;
P_SW2 |= 0x80;
if (I2CSLST & 0x40)
{
I2CSLST &= ~0x40; //处理START事件
}
else if (I2CSLST & 0x20)
{
I2CSLST &= ~0x20; //处理RECV事件，SLACKO设置为0
if (isda)
{
isda = 0; //处理RECV事件（RECV DEVICE ADDR）
}
else if (isma)
{
isma = 0; //处理RECV事件（RECV MEMORY ADDR）
addr = I2CRXD;
Tx_Cnt = 0;
Rx_Cnt = 0;
switch(addr)
{
case 0:
I2CTXD = TxBuf0;
break;
case 1:
I2CTXD = TxBuf1;
break;
case 2:
I2CTXD = TxBuf2;
break;
case 3:
I2CTXD = TxBuf3;
break;
case 4:
I2CTXD = TxBuf4;
break;
case 5:
I2CTXD = TxBuf5;
break;
case 6:
I2CTXD = TxBuf6;
break;
case 7:
I2CTXD = TxBuf7;
break;
}
}
else
{
// Rx_Cnt = 0;
RxBuffer = I2CRXD; //处理RECV事件（RECV DATA）
}
}
else if (I2CSLST & 0x10)
{
I2CSLST &= ~0x10; //处理SEND事件
if (I2CSLST & 0x02)
{
I2CTXD = 0xff;
}
else
{
switch(addr)
{
case 0:
I2CTXD = TxBuf0;
break;
case 1:
I2CTXD = TxBuf1;
break;
case 2:
I2CTXD = TxBuf2;
break;
case 3:
I2CTXD = TxBuf3;
break;
case 4:
I2CTXD = TxBuf4;
break;
case 5:
I2CTXD = TxBuf5;
break;
case 6:
I2CTXD = TxBuf6;
break;
case 7:
I2CTXD = TxBuf7;
break;
}
}
}
else if (I2CSLST & 0x08)
{
I2CSLST &= ~0x08; //处理STOP事件
isda = 1;
isma = 1;
DisplayFlag = 1;
}
P_SW2 = store;
}
void main()
{
P0M1 = 0x00; P0M0 = 0x00; //设置为准双向口
P3M1 = 0x0c; P3M0 = 0x0c; //SCL、SDA设置为开漏模式
P_SW2 = 0x80;
P_SW2 |= 0x30; //I2C功能脚选择，00:P1.5,P1.4; 01:P2.5,P2.4; 11:P3.2,P3.3
I2CCFG = 0x80; //使能I2C从机模式
I2CSLADR = 0x2d; //设置从机设备地址为5A
I2CSLST = 0x00;
I2CSLCR = 0x78; //使能从机模式中断
DisplayFlag = 0;
UART1_config(1); // 选择波特率, 2: 使用Timer2做波特率, 其它值: 使用Timer1做波特率.
EA = 1;
isda = 1; //用户变量初始化
isma = 1;
addr = 0;
I2CTXD = RxBuffer;
while (1)
{
if(DisplayFlag)
{
DisplayFlag = 0;
if(RxBuffer < 10)
{
printf("I2CRXD=%bd\r\n",I2CRXD);//尝试打印接收到的消息
printf("RxBuffer=%bd\r\n",RxBuffer);//尝试打印接收到的消息
printf("Rx_Cnt=%bd\r\n",Rx_Cnt);//尝试打印接收到的消息
}
}
}
}
//========================================================================
// 函数: SetTimer2Baudraye(u16 dat)
// 描述: 设置Timer2做波特率发生器。
// 参数: dat: Timer2的重装值.
// 返回: none.
//========================================================================
void SetTimer2Baudraye(u16 dat)// 选择波特率, 2: 使用Timer2做波特率, 其它值: 使用Timer1做波特率.
{
AUXR &= ~(1<<4); //Timer stop
AUXR &= ~(1<<3); //Timer2 set As Timer
AUXR |=(1<<2); //Timer2 set as 1T mode
TH2 = dat / 256;
TL2 = dat % 256;
IE2&= ~(1<<2); //禁止中断
AUXR |=(1<<4); //Timer run enable
}
//========================================================================
// 函数: void UART1_config(u8 brt)
// 描述: UART1初始化函数。
// 参数: brt: 选择波特率, 2: 使用Timer2做波特率, 其它值: 使用Timer1做波特率.
// 返回: none.
//========================================================================
void UART1_config(u8 brt) // 选择波特率, 2: 使用Timer2做波特率, 其它值: 使用Timer1做波特率.
{
/*********** 波特率使用定时器2 *****************/
if(brt == 2)
{
AUXR |= 0x01; //S1 BRT Use Timer2;
SetTimer2Baudraye(65536UL - (MAIN_Fosc / 4) / Baudrate1);
}
/*********** 波特率使用定时器1 *****************/
else
{
TR1 = 0;
AUXR &= ~0x01; //S1 BRT Use Timer1;
AUXR |=(1<<6); //Timer1 set as 1T mode
TMOD &= ~(1<<6); //Timer1 set As Timer
TMOD &= ~0x30; //Timer1_16bitAutoReload;
TH1 = (u8)((65536UL - (MAIN_Fosc / 4) / Baudrate1) / 256);
TL1 = (u8)((65536UL - (MAIN_Fosc / 4) / Baudrate1) % 256);
ET1 = 0; //禁止中断
INT_CLKO &= ~0x02;//不输出时钟
TR1= 1;
}
/*************************************************/
SCON = (SCON & 0x3f) | 0x40; //UART1模式, 0x00: 同步移位输出, 0x40: 8位数据,可变波特率, 0x80: 9位数据,固定波特率, 0xc0: 9位数据,可变波特率
//PS= 1; //高优先级中断
ES= 1; //允许中断
REN = 1; //允许接收
P_SW1 &= 0x3f;
P_SW1 |= 0x00; //UART1 switch to, 0x00: P3.0 P3.1, 0x40: P3.6 P3.7, 0x80: P1.6 P1.7, 0xC0: P4.3 P4.4
//PCON2 |=(1<<4); //内部短路RXD与TXD, 做中继, ENABLE,DISABLE
B_TX1_Busy = 0;
TX1_Cnt = 0;
RX1_Cnt = 0;
}
//========================================================================bh88gt
// 函数: void UART1_int (void) interrupt UART1_VECTOR
// 描述: UART1中断函数。
// 参数: nine.
// 返回: none.
//========================================================================
void UART1_int (void) interrupt 4
{
if(RI)
{
RI = 0;
RX1_Buffer = SBUF;
if(++RX1_Cnt >= UART1_BUF_LENGTH) RX1_Cnt = 0; //防溢出
}
if(TI)
{
TI = 0;
B_TX1_Busy = 0;
}
}
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