[问答]

在SDA和SCK上没有看到任何数据或时钟

问答对人有帮助，内容完整，我也想知道答案 0 你好，我正在开发一个PIC16F150 3微控制器的项目，我需要使用I2C接口主模式。不幸的是，它似乎不起作用：我在SDA和SCK上没有看到任何数据或时钟。我已经创建了一个小应用程序，在I2C总线上连续发送数据，以便调试这个问题：我配置的RC4只查看程序是否在我的示波器上运行。附加信息：工具链：XC8 V1.42程序员：PICtiT2（没有调试可用的这个设备）我的代码有什么问题？最好的问候。以上来自于百度翻译以下为原文 Hello, I'm developing a project with PIC16F1503 microcontroller and I need to use the I2C interface Master mode. Unfortunately it seems not working: I don't see any data or clock on SDA and SCK. I have created a small application, continuously sending data on I2C bus, in order to debug this problem: /* * File: main.c * Author: XXX * * Created on 15 marzo 2018, 7.45 / // CONFIG1 #pragma config FOSC = INTOSC // Oscillator Selection Bits (INTOSC oscillator: I/O function on CLKIN pin) #pragma config WDTE = ON // Watchdog Timer Enable (WDT enabled) #pragma config PWRTE = OFF // Power-up Timer Enable (PWRT disabled) #pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR) #pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled) #pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled) #pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin) // CONFIG2 #pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off) #pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset) #pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.) #pragma config LPBOR = OFF // Low-Power Brown Out Reset (Low-Power BOR is disabled) #pragma config LVP = ON // Low-Voltage Programming Enable (Low-voltage programming enabled) #include #define _XTAL_FREQ 16000000 void I2C_Master_Init(const unsigned long c) { SSP1CON1 = 0b00101000; //SSP Module as Master SSP1CON2 = 0; SSP1ADD = (_XTAL_FREQ/(4c))-1; //Setting Clock Speed SSP1STAT = 0; TRISC0 = 1; //Setting as input as given in datasheet TRISC1 = 1; //Setting as input as given in datasheet } void I2C_Master_Wait() { while ((SSP1STAT & 0x01) \|\| (SSP1CON2 & 0x1F)); //Transmit is in progress } void I2C_Master_Start() { I2C_Master_Wait(); SEN = 1; //Initiate start condition } void I2C_Master_RepeatedStart() { I2C_Master_Wait(); RSEN = 1; //Initiate repeated start condition } void I2C_Master_Stop() { I2C_Master_Wait(); PEN = 1; } void I2C_Master_Write(unsigned d) { I2C_Master_Wait(); SSP1BUF = d; //Write data to SSPBUF } unsigned short I2C_Master_Read(unsigned short a) { unsigned short temp; I2C_Master_Wait(); RCEN = 1; I2C_Master_Wait(); temp = SSP1BUF; //Read data from SSPBUF I2C_Master_Wait(); ACKDT = (a)?0:1; //Acknowledge bit ACKEN = 1; //Acknowledge sequence return temp; } void main(void) { OSCCON = 0x7A; TRISC4 = 0; I2C_Master_Init(100000); while (1) { RC4 = 1; I2C_Master_Start(); //Start condition I2C_Master_Write(0x30); //7 bit address + Write I2C_Master_Write(0x57); //Write data I2C_Master_Stop(); //Stop condition RC4 = 0; } return; } I configured RC4 only to see if the program is running or not with my oscilloscope. Additional information: Toolchain: XC8 v1.42 Programmer: PICkit2 (no debug available for this device) Any idea on what's wrong with my code? Best Regards. 0
2018-10-25 16:49:12　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答技术发广告该类别下有 56 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报李云生相关推荐 • ADE7880 SPI通讯没有看到任何数据 1263 • SPI从时钟使用实际的SCK有什么问题 3586 • 请问ds1302时钟芯片的读数据函数是什么意思？ 2731 • 在XC32 V1.43的编译器手册中没有看到任何东西 1046 • 如何从我的PIC16F1615的MSSP模块得到任何东西 875 • XMC4700通过发送相应的报头来获取LIN总线上的可用数据，没有从从属设备上得到任何响应，为什么？ 2853 • 无法在液晶显示屏上看到任何字符是什么原因？ 1455 • 如何使用DV102411 WiFi COMM演示板与I2C传感器接口 1015 • IMX8Nano内核5.15.5上SAI接口的时钟问题求解 266 • 如何管理目标在读取传输过程中返回的EOD T-Bit？ 188 2个回答

答案对人有帮助，有参考价值 0 PORTC在复位时默认为模拟模式，必须清除ANSELC SFR中的位，以将RC0和RC1设置成数字模式。以上来自于百度翻译以下为原文 PORTC defaults to analog mode on reset, you must clear the bits in the ANSELC SFR to set RC0 and RC1 into digital mode.

2018-10-25 17:05:56 评论举报 tijing忽忽

答案对人有帮助，有参考价值 0 您好杰克@ KKStack，谢谢您的帮助。现在我看到I2C总线时钟数据，但我仍然遇到一些问题。你可以从我的代码中看到：我在I2C:0x30（7bit地址+W位）和0x56上写了2个字节，但是似乎第二个字节根本没有被录入（见附图）。最好的问候。以上来自于百度翻译以下为原文 Hello jack@kksound, thanks for your help. Now I see I2C bus clocking out data, but I'm still experiencing some problems. As you can see from my code: /* * File: main.c * Author: XXX * * Created on 15 marzo 2018, 7.45 / // CONFIG1 #pragma config FOSC = INTOSC // Oscillator Selection Bits (INTOSC oscillator: I/O function on CLKIN pin) #pragma config WDTE = ON // Watchdog Timer Enable (WDT enabled) #pragma config PWRTE = OFF // Power-up Timer Enable (PWRT disabled) #pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR) #pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled) #pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled) #pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin) // CONFIG2 #pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off) #pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will cause a Reset) #pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.) #pragma config LPBOR = OFF // Low-Power Brown Out Reset (Low-Power BOR is disabled) #pragma config LVP = ON // Low-Voltage Programming Enable (Low-voltage programming enabled) #include #define _XTAL_FREQ 16000000 void I2C_Master_Init(const unsigned long c) { SSP1CON1 = 0b00101000; //SSP Module as Master SSP1CON2 = 0; SSP1ADD = (_XTAL_FREQ/(4c))-1; //Setting Clock Speed SSP1STAT = 0; TRISC0 = 1; //Setting as input as given in datasheet TRISC1 = 1; //Setting as input as given in datasheet } void I2C_Master_Wait() { while ( (SEN == 1) \|\| (RSEN == 1) \|\| (PEN == 1) \|\| (RCEN == 1) \|\| (SSP1STAT&0x04) ); //while ((SSP1STAT & 0x01) \|\| (SSP1CON2 & 0x1F)); //Transmit is in progress } void I2C_Master_Start() { //I2C_Master_Wait(); SEN = 1; //Initiate start condition while (SEN == 1); } void I2C_Master_RepeatedStart() { //I2C_Master_Wait(); RSEN = 1; //Initiate repeated start condition while (RSEN == 1); } void I2C_Master_Stop() { //I2C_Master_Wait(); PEN = 1; while (PEN == 1); } void I2C_Master_Write(unsigned d) { //I2C_Master_Wait(); SSP1BUF = d; //Write data to SSPBUF while (BF == 1); } unsigned short I2C_Master_Read(unsigned short a) { unsigned short temp; //I2C_Master_Wait(); RCEN = 1; while(BF==0); //I2C_Master_Wait(); temp = SSP1BUF; //Read data from SSPBUF I2C_Master_Wait(); ACKDT = (a)?0:1; //Acknowledge bit ACKEN = 1; //Acknowledge sequence return temp; } void main(void) { OSCCON = 0x7A; TRISC4 = 0; ANSC0 = 0; ANSC1 = 0; NCO1SEL = 1; // NCO1 on RA4 I2C_Master_Init(100000); while (1) { RC4 = 1; I2C_Master_Start(); //Start condition I2C_Master_Write(0x30); //7 bit address + Write I2C_Master_Write(0x57); //Write data I2C_Master_Stop(); //Stop condition RC4 = 0; for (int i = 0; i < 1000; i++) { for (int j = 0; j < 1000; j++) { } } } return; } I'm writing 2 bytes on I2C: 0x30 (7bit address + W bit) and 0x56, but it seems that the second byte is not clocked out at all (see attached images). Maybe anything else wrong with I2C configuration? Best Regards. Attached Image(s)

2018-10-25 17:20:32 评论举报陈琳