Jim Lai
Joined: 20 Jul 2010
Posts: 4
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| AD7746 I2C |
 Posted: Tue Jul 20, 2010 10:09 am |
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Hallo: I am new here, just wrote code for AD7746. By CCS compiling it shows NO ERROR, also program can run, but I found it run never down since it halted in the line:
| Code: |
#use i2c(master, sda=Device_SDA, scl=Device_SLC)
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Can somebody help me to find errors? Thanks
| Code: |
#include <18f8722.h>
#device ICD=TRUE
//#use delay(internal=1Mhz)
#fuses HS, NOLVP, NOWDT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#define Device_SDA PIN_B1
#define Device_SLC PIN_B0
#use i2c(master, sda=Device_SDA, scl=Device_SLC)
#define I2C_ADDR_W 0x90
#define I2C_ADDR_R 0x91
#define REG_STATUS 0x00
#define REG_CAP_DATA 0x01
#define REG_VT_DATA 0x04
#define REG_CAP_SETUP 0x07
#define REG_VT_SETUP 0x08
#define REG_EXC_SETUP 0x09
#define REG_CONFIG 0x0A
#define REG_CAP_DAC_A 0x0B
#define REG_CAP_OFFSET 0x0D
#define REG_CAP_GAIN 0x0F
#define REG_CAP_V_GAIN 0x11
#define RESET_ADDR 0xBF
#define CAP_ZERO 0x800000L
void setup()
{
//RESET
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(RESET_ADDR);
i2c_stop();
//wait for a boot
delay_ms(1000);
//Set up and configuration
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_CAP_SETUP);
i2c_write(0x80); //CAP setup, CAPEN single, continue or calib
i2c_write(0x81); //VT setup, VTEN, single conversion, continue, calib
i2c_write(0x0B); //Exe setup,EXON only on cap, EXCA, EXC Low=0, High=VDD
i2c_write(0x21); //Configuration continue conversion
i2c_write(0x00); //CAP DAC A setup, disable
i2c_write(0x00); //CAP DAC B setup, disable
i2c_stop();
delay_ms(1000);
}
byte checkStatus()
{
BYTE status;
i2c_start();
i2c_write(I2C_ADDR_R);
i2c_write(REG_STATUS);
i2c_start();
delay_us(10);
i2c_write(I2C_ADDR_R);
status = i2c_read(1);
i2c_stop();
return(status);
}
byte *read3Byte(byte REG_ADDR3)
{
byte *Array, readyStatus;
while (readyStatus && 0x5) readyStatus = checkStatus();
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_ADDR3);
i2c_start();
delay_us(10);
i2c_write(I2C_ADDR_R);
*Array = i2c_read(1);
*(Array+1) = i2c_read(1);
*(Array+2) = i2c_read(0);
i2c_stop();
return(Array);
}
byte *read2Byte(byte REG_ADDR2)
{
byte *Array, readyStatus;
while (readyStatus && 0x5) readyStatus = checkStatus();
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_ADDR2);
i2c_start();
delay_us(10);
i2c_write(I2C_ADDR_R);
*Array = i2c_read(1);
*(Array+1) = i2c_read(0);
i2c_stop();
return(Array);
}
byte *read6Byte()
{
byte *Array, readyStatus;
while (readyStatus && 0x5) readyStatus = checkStatus();
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_CAP_DATA);
i2c_start();
delay_us(10);
i2c_write(I2C_ADDR_R);
*Array = i2c_read(1);
*(Array+1) = i2c_read(1);
*(Array+2) = i2c_read(1);
*(Array+3) = i2c_read(1);
*(Array+4) = i2c_read(1);
*(Array+5) = i2c_read(0);
i2c_stop();
return(Array);
}
byte *readREG()
{
byte *Array, readyStatus;
while (readyStatus && 0x5) readyStatus = checkStatus();
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_CAP_SETUP);
i2c_start();
delay_us(10);
i2c_write(I2C_ADDR_R);
*Array = i2c_read(1);
*(Array+1) = i2c_read(1);
*(Array+2) = i2c_read(1);
*(Array+3) = i2c_read(0);
i2c_stop();
return(Array);
}
void offsetCalib()
{
//Set up for offset calib
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_CONFIG);
i2c_write(0xFD); //Configuration offset calib
i2c_stop();
delay_ms(5000);
}
void gainCalib()
{
//Set up for offset calib
i2c_start();
i2c_write(I2C_ADDR_W);
i2c_write(REG_CONFIG);
i2c_write(0xFE); //Configuration gain calib
i2c_stop();
delay_ms(5000);
}
#int_rda
void serial_interrupt()
{
char c;
c = getc();
switch(c) {
case 'o':
printf("Please waiting for Offset Calibration");
offsetCalib();
break;
case 'g':
printf("Please waiting for Offset Calibration");
gainCalib();
break;
}
}
void main()
{
byte dataArray[6], REGarray[4];
enable_interrupts(int_rda);
enable_interrupts(global);
setup();
REGarray = readREG();
dataArray = read6Byte();
}
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