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標題: 請教AD7150+MSP430G2553單片機i2C通訊問題該如何編碼? [打印本頁]

作者: Justin_Tsao 時間: 2015-3-16 14:13
標題: 請教AD7150+MSP430G2553單片機i2C通訊問題該如何編碼?
想做一個簡單的微電容位移傳感器  采用AD7150 來獲得電容值
AD7150 是I2C傳送數據，因為想做的簡單，就用MSP430G2553單片機做主控，模擬I2C通信方式，來獲取輸入
程式語言部分該如何編碼?

底下是我參考open source
msp430g2xx3_uscib0_i2c_12.c
進行修改
但不了解各個狀態要如何設定 (寄存器位址等)?
請各位大大協助

#include
#include "msp430g2553.h"

#define NUM_BYTES_TX 1                      // How many bytes?
#define NUM_BYTES_RX 1

int RXByteCtr, RPT_Flag = 0;             // enables repeated start when 1
volatile unsigned char RxBuffer[128];    // Allocate 128 byte of RAM
unsigned char *PTxData;                   // Pointer to TX data
unsigned char *PRxData;                   // Pointer to RX data
unsigned char TXByteCtr, RX = 0;
unsigned char MSData = 0x55;
unsigned int RxWord;
unsigned int RxByteCtr;
unsigned char i;
float       pFdata;
float       chRange;

void Setup_TX(void);
void Setup_RX(void);
void Transmit(void);
void Receive(void);
float AD7150_Cap(void);

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P1SEL |= BIT6 + BIT7;                   // Assign I2C pins to USCI_B0
  P1SEL2|= BIT6 + BIT7;                   // Assign I2C pins to USCI_B0

  while(1){

  //Transmit process
  Setup_TX();
  RPT_Flag = 1;
  Transmit();
  while (UCB0CTL1 & UCTXSTP);          // Ensure stop condition got sent

  //Receive process
  Setup_RX();
  Receive();
  while (UCB0CTL1 & UCTXSTP);          // Ensure stop condition got sent
  }
}
//-------------------------------------------------------------------------------
// The USCI_B0 data ISR is used to move received data from the I2C slave
// to the MSP430 memory. It is structured such that it can be used to receive
// any 2+ number of bytes by pre-loading RXByteCtr with the byte count.
//-------------------------------------------------------------------------------
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
{
  if(RX == 1){                            // Master Recieve?
  RXByteCtr--;                            // Decrement RX byte counter
  if (RXByteCtr)
  {
*PRxData++ = UCB0RXBUF;                // Move RX data to address PRxData
  }
  else
  {
if(RPT_Flag == 0)
      UCB0CTL1 |= UCTXSTP;             // No Repeated Start: stop condition
   if(RPT_Flag == 1){                   // if Repeated Start: do nothing
      RPT_Flag = 0;
   }
*PRxData = UCB0RXBUF;                // Move final RX data to PRxData

__bic_SR_register_on_exit(CPUOFF);    // Exit LPM0
  }}

  else{                                  // Master Transmit
   if (TXByteCtr)                      // Check TX byte counter
  {
UCB0TXBUF = MSData++;                // Load TX buffer
TXByteCtr--;                         // Decrement TX byte counter
  }
  else
  {
if(RPT_Flag == 1){
RPT_Flag = 0;
PTxData = &MSData;                   // TX array start address
TXByteCtr = NUM_BYTES_TX;                // Load TX byte counter
__bic_SR_register_on_exit(CPUOFF);
}
else{
UCB0CTL1 |= UCTXSTP;                   // I2C stop condition
IFG2 &= ~UCB0TXIFG;                   // Clear USCI_B0 TX int flag
__bic_SR_register_on_exit(CPUOFF);    // Exit LPM0
}
  }
}

}
void Setup_TX(void){
  _DINT();
  RX = 0;
  IE2 &= ~UCB0RXIE;
  while (UCB0CTL1 & UCTXSTP);             // Ensure stop condition got sent// Disable RX interrupt
  UCB0CTL1 |= UCSWRST;                   // Enable SW reset
  UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC;    // I2C Master, synchronous mode
  UCB0CTL1 = UCSSEL_2 + UCSWRST;          // Use SMCLK, keep SW reset
  UCB0BR0 = 12;                            // fSCL = SMCLK/12 = ~100kHz
  UCB0BR1 = 0;
  UCB0I2CSA = 0x48;                      // Slave Address is 048h
  UCB0CTL1 &= ~UCSWRST;                   // Clear SW reset, resume operation
  IE2 |= UCB0TXIE;                         // Enable TX interrupt
}
void Setup_RX(void){
  _DINT();
  RX = 1;
  IE2 &= ~UCB0TXIE;
  UCB0CTL1 |= UCSWRST;                   // Enable SW reset
  UCB0CTL0

作者: sunmj111 時間: 2022-4-24 15:24
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