我正在使用PIC18F45K22和XC8。
我已经为I2C插入了MCC库
我需要从ds1307读取秒数的示例，并在下一级中更改当前时间。
根据下面的代码，我在里面
while（状态== I2C2_MESSAGE_PENDING）;
I2C2_MasterWrite(&pdata_write, 1, 0b11010000, &status);
// at this point, your status will probably be I2C2_MESSAGE_PENDING
while (status == I2C2_MESSAGE_PENDING); // wait for status to to change
if (status == I2C2_MESSAGE_COMPLETE) {
I2C2_MasterRead(&pdata_read, 1, 0b11010001, &status);
while (status == I2C2_MESSAGE_PENDING); // again, wait for status to to change
if (status == I2C2_MESSAGE_COMPLETE) {
// pdata_read should now be the number of seconds (in binary-coded decimal)
}
这是我从MCC自动创建的密码管理器
#define SCL2_TRIS TRISDbits.TRISD0
#define SCL2_LAT LATDbits.LATD0
#define SCL2_PORT PORTDbits.RD0
#define SCL2_ANS ANSELDbits.ANSD0
#define SCL2_SetHigh() do { LATDbits.LATD0 = 1; } while(0)
#define SCL2_SetLow() do { LATDbits.LATD0 = 0; } while(0)
#define SCL2_Toggle() do { LATDbits.LATD0 = ~LATDbits.LATD0; } while(0)
#define SCL2_GetValue() PORTDbits.RD0
#define SCL2_SetDigitalInput() do { TRISDbits.TRISD0 = 1; } while(0)
#define SCL2_SetDigitalOutput() do { TRISDbits.TRISD0 = 0; } while(0)
#define SCL2_SetAnalogMode() do { ANSELDbits.ANSD0 = 1; } while(0)
#define SCL2_SetDigitalMode() do { ANSELDbits.ANSD0 = 0; } while(0)
// get/set SDA2 aliases
#define SDA2_TRIS TRISDbits.TRISD1
#define SDA2_LAT LATDbits.LATD1
#define SDA2_PORT PORTDbits.RD1
#define SDA2_ANS ANSELDbits.ANSD1
#define SDA2_SetHigh() do { LATDbits.LATD1 = 1; } while(0)
#define SDA2_SetLow() do { LATDbits.LATD1 = 0; } while(0)
#define SDA2_Toggle() do { LATDbits.LATD1 = ~LATDbits.LATD1; } while(0)
#define SDA2_GetValue() PORTDbits.RD1
#define SDA2_SetDigitalInput() do { TRISDbits.TRISD1 = 1; } while(0)
#define SDA2_SetDigitalOutput() do { TRISDbits.TRISD1 = 0; } while(0)
#define SDA2_SetAnalogMode() do { ANSELDbits.ANSD1 = 1; } while(0)
#define SDA2_SetDigitalMode() do { ANSELDbits.ANSD1 = 0; } while(0)
Image
Image2
见下面的图片
也试图在我的液晶显示器中显示时间
sprintf(txt,"%d",pdata_read);
LCDPutStr(txt,1);
最佳答案
我没有硬件或软件，但查看了https://www.studentcompanion.co.za/interfacing-the-ds1307-real-time-clock-with-pic-microcontroller-xc8/（一个很长的教程，可以使您快速入门）和https://datasheets.maximintegrated.com/en/ds/DS1307.pdf（数据表），以及一些提到 / I2C_MasterWrite以某种方式。
非常低级的步骤是：
START（为您处理）
写入0b1101000（这是地址加方向位）
收到确认
如您正确指出的那样，“秒”寄存器的写地址为I2C_MasterRead（这是数据）
收到确认
开始
写入0b11010001（这是地址加方向位）
收到确认
读
发送确认或不确认
看起来很底层的部分（START / ACKNOWLEDGE和发送地址）正在为您处理，因此您可能只需要执行与以下代码类似的操作（您可能希望重组0x00逻辑以处理错误）更好）：
I2C_MESSAGE_STATUS status;
uint8_t pdata_write = 0; // 0 to 'seconds' register
uint8_t pdata_read; // will hold 'seconds'
I2C2_MasterWrite(&pdata_write, 1, 0b1101000, &status);
// at this point, your status will probably be I2C2_MESSAGE_PENDING
while (status == I2C_MESSAGE_PENDING); // wait for status to to change
if (status == I2C_MESSAGE_COMPLETE) {
I2C2_MasterRead(&pdata_read, 1, 0b1101000, &status);
while (status == I2C_MESSAGE_PENDING); // again, wait for status to to change
if (status == I2C_MESSAGE_COMPLETE) {
// pdata_read should now be the number of seconds (in binary-coded decimal)
}
}
if是指向您要读取/写入的内容的指针，它实际上是指向上述步骤4中包含*pdata的变量的指针。0x0是您要读取/写入的数据的长度，我认为在上面列出的所有步骤中，该长度恰好为1length是DS1307的地址，address0b1101000是I2C消息的状态。根据https://github.com/apaivaj/WWVB/blob/master/MainProject/WWVB/mcc_generated_files/i2c1.h，
pstatus可以是以下任意一项：typedef enum
{
I2C1_MESSAGE_FAIL,
I2C1_MESSAGE_PENDING,
I2C1_MESSAGE_COMPLETE,
I2C1_STUCK_START,
I2C1_MESSAGE_ADDRESS_NO_ACK,
I2C1_DATA_NO_ACK,
I2C1_LOST_STATE
} I2C1_MESSAGE_STATUS;
您可能应该至少检查
pstatus。更新：要写入秒寄存器，请参见数据表第12页的图4：您需要写入两段数据：首先是寄存器编号，然后是您想要写入该寄存器的编号。因此，代码如下所示：
I2C_MESSAGE_STATUS status;
uint8_t pdata_write[2] = { 0, 0x10 }; // 0x10 into 'seconds' register
I2C2_MasterWrite(pdata_write, 1, 0b1101000, &status);
while (status == I2C_MESSAGE_PENDING); // wait for status to to change
if (status == I2C_MESSAGE_COMPLETE) {
// done!
} else {
// error
}
关于c - 使用I2C的读取时间(Ds1307)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49492415/