[问答]

NOOB无法让U（S）ART在PIC18F1220上工作

问答对人有帮助，内容完整，我也想知道答案 0 所有的，IM新的PIC发展，但不是C。我已经和它战斗了一段时间，好像我错过了一些愚蠢的事情…我试图把一个简单的“AT rn”发送到一个连接的SIM800 L中，然后返回一个“OK”。因为我只有一个UART，所以我试图在缓冲器上做一个监视，停止执行，看看调制解调器中的“OK”是否在缓冲器中。（我对其他的想法开放调试）编译器XC8这里是我的代码…IVE尽可能地把它拆了……Greenie McGreen。以上来自于百度翻译以下为原文 All, Im new to PIC Development, but not C... I've been fighting with this for awhile and it seems i'm missing something stupid... Im trying to send in a simple "ATrn" into a connected SIM800L and get back an "OK". Since i only have the one UART i'm trying to do a watch on a buffer, stop execution and see if "OK" is in the buffer from the modem. (i'm open to other ideas to debug this) Compiler XC8 Here is my code... Ive stripped it down as much as possible... #define _XTAL_FREQ 10000000 //#define USE_AND_MASKS #if defined(__XC) #include /* XC8 General Include File / #elif defined(HI_TECH_C) #include / HiTech General Include File / #elif defined(__18CXX) #include / C18 General Include File / #endif #include / For uint8_t definition / #include / For true/false definition / #include #include #include #include #include #include "system.h" / System funct/params, like osc/peripheral config / #include "user.h" / User funct/params, such as InitApp / /****************************************************************************/ / User Global Variable Declaration / /****************************************************************************/ void delay_100ms(int value); char UART_Init(const long int baudrate); char UART_TX_Empty(); char UART_Data_Ready(); char UART_Read(); void UART_Read_Text(unsigned int length); void UART_Write(char data); void UART_Write_Text(char text); char Output[20]; int d; int i_delay; void main(void) { ConfigureOscillator(); InitApp(); TRISBbits.TRISB6 = 0; //TX pin set as output TRISBbits.TRISB7 = 1; //RX pin set as input TRISBbits.TRISB5 = 0; INTCONbits.GIE = FALSE; UART_Init(9600); delay_100ms(2); //200ms delay UART_Write_Text("ATrn"); delay_100ms(10); //200ms delay UART_Read_Text(5); for(;;) { // flash an LED so i can see the loop is running... PORTBbits.RB5 = 1; delay_100ms(10); // 1 Second Delay PORTBbits.RB5 = 0; delay_100ms(10); // 1 Second Delay } } void delay_100ms(int value) { d = value10; i_delay = 0; while( i_delay < d ) { __delay_ms(10); i_delay++; } } char UART_Init(const long int baudrate) { unsigned int x; x = (_XTAL_FREQ - baudrate64)/(baudrate64); if(x>255) { x = (_XTAL_FREQ - baudrate16)/(baudrate16); BRGH = 1; } if(x<256) { SPBRG = x; SYNC = 0; SPEN = 1; CREN = 1; TXEN = 1; TX9 = 0; RX9 = 0; return 1; } return 0; } char UART_TX_Empty() { return TRMT; } char UART_Data_Ready() { return RCIF; } char UART_Read() { if(OERR) // check for Error { CREN = 0; //If error -> Reset CREN = 1; //If error -> Reset } while(!RCIF){ return RCREG; } } void UART_Read_Text(unsigned int length) { for( int i=0;i Output = UART_Read(); } void UART_Write(char data) { while(!TRMT) { TXREG = data; } } void UART_Write_Text(char text) { while( text ) { UART_Write(*text++); } } The config stuff #pragma config OSC = HS // Oscillator Selection bits (HS Oscillator) #pragma config FSCM = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled) #pragma config IESO = OFF // Internal External Switchover bit (Internal External Switchover mode disabled) // CONFIG2L #pragma config PWRT = ON // Power-up Timer Enable bit (PWRT enabled) #pragma config BOR = ON // Brown-out Reset Enable bit (Brown-out Reset enabled) #pragma config BORV = 27 // Brown-out Reset Voltage bits (VBOR set to 2.7V) // CONFIG2H #pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit)) #pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768) // CONFIG3H #pragma config MCLRE = ON // MCLR Pin Enable bit (RA5 input pin enabled, MCLR disabled) // CONFIG4L #pragma config STVR = OFF // Stack Full/Underflow Reset Enable bit (Stack full/underflow will not cause Reset) #pragma config LVP = OFF // Low-Voltage ICSP Enable bit (Low-Voltage ICSP disabled) // CONFIG5L #pragma config CP0 = OFF // Code Protection bit (Block 0 (00200-0007FFh) code-protected) #pragma config CP1 = OFF // Code Protection bit (Block 1 (000800-000FFFh) code-protected) // CONFIG5H #pragma config CPB = OFF // Boot Block Code Protection bit (Boot Block (000000-0001FFh) code-protected) #pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM not code-protected) // CONFIG6L #pragma config WRT0 = OFF // Write Protection bit (Block 0 (00200-0007FFh) not write-protected) #pragma config WRT1 = OFF // Write Protection bit (Block 1 (000800-000FFFh) not write-protected) // CONFIG6H #pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected) #pragma config WRTB = OFF // Boot Block Write Protection bit (Boot Block (000000-0001FFh) not write-protected) #pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM not write-protected) // CONFIG7L #pragma config EBTR0 = OFF // Table Read Protection bit (Block 0 (00200-0007FFh) not protected from table reads executed in other blocks) #pragma config EBTR1 = OFF // Table Read Protection bit (Block 1 (000800-000FFFh) not protected from table reads executed in other blocks) // CONFIG7H #pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot Block (000000-0001FFh) not protected from table reads executed in other blocks) #pragma config DEBUG = ON Thanks Mr Greenie McGreen... 0
2019-3-29 09:00:13　　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 caoguiqun 该类别下有 56 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 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 60user92 该类别下有 29 个回答。邀请回答 wy8719 该类别下有 29 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 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 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。邀请回答举报李玉梅相关推荐 • pic18f1220 eeprom用作程序员时不工作 1280 • 读了PIC18F1220的内存时得到了每个内存位置的值0xFF怎么回事 2877 • 用哪一个编译器编译PIC16F877 A的程序？ 2527 • SMBus在PIC18F45 K20上工作为什么函数START被标记 1621 • PIC18F47K42的I2C问题 2244 • PIC18F25K20/80对程序无反应，没有任何效果 2462 • PIC18F USB：尝试使用USB模块，但无法在我的项目中进行 998 • 有没有人能够让SQI1CS0在设备上工作？ 1272 • pic18f45k40 pps输出引脚都不工作该怎么办？ 1241 • Pickit 3不能与PIC18F27K42+UART一起使用 2005 1个回答

答案对人有帮助，有参考价值 0 如果你知道你正在使用XC8，那么用JuSube替换所有这一切，去掉这一行，你的代码根本不应该触碰到这一点。XC8是哪一个版本？您似乎在部分地使用外围库，因为在UARTHAREAD函数中，自从版本1.34以来还没有包含XC8，这个代码应该是BEI。E.返回不应该在里面。您尝试过先连接到PC吗？有效调试的秘诀是一次解决一个问题。尝试同时发送和接收意味着你不知道哪一个不能工作。试着先发送到PC，这样你就可以知道波特率是否正确。以上来自于百度翻译以下为原文 If you know you are using XC8, then replace all this #if defined(__XC) #include /* XC8 General Include File / #elif defined(HI_TECH_C) #include / HiTech General Include File / #elif defined(__18CXX) #include / C18 General Include File / #endif with just #include / XC8 General Include File */ Also, get rid of this line #pragma config DEBUG = ON Your code should NOT touch that bit at all. Which version of XC8 is it? You appear to be partly iusing the peripheral libraries, which haven't been included with XC8 since version 1.34. In your UART_read function, this code: while(!RCIF){ return RCREG; } should be while(!RCIF){} return RCREG; i.e. the return should not be inside the while. Have you tried connecting to a PC first? The secret to efficient debugging is to fix one problem at a time. Trying to test send and receive at the same time means you don't know which one isn't working. Try sending to a PC first, which lets you see if your baud rate is correct.

2019-3-29 09:18:05 评论举报王焕树