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Classic
Joined: 22 Aug 2011
Posts: 6
Location: Thailand
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| Accelerometer + 18F46J50 not work |
 Posted: Tue Aug 23, 2011 1:09 pm |
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I'm newbie for CCS. This code compile pass but not output in oscilloscope. Code what's wrong. Can you help me?
| Code: |
#include <18F46J50.h>
#fuses HS,NOPROTECT,NOWDT,NOLVP
#use delay(clock=20000000)
//************************************************************MMA7455 reg define
#define XOUT8 0x06
#define YOUT8 0x07
#define ZOUT8 0x08
#define MCTL 0x16 //4g, measurement mode,SPI 4wire =0x09
//***********************************MMA7455_SPI PIN define
#define MMA7455_CS PIN_A5 //0
#define MMA7455_CLK PIN_B4 //0
#define MMA7455_SDI PIN_B5 //0
#define MMA7455_SDO PIN_C7 //1
#define MMA7455_INT1 PIN_B0 //1 DRDY
//**************************SPI_write data to MMA7455
void spi_write(char addr)
{
char a;
for(a=0;a<8;a++) // loop 8 bit
{
if((addr & 0x80)== 0x80) //check data bit 8 w=1 r=0
output_high(MMA7455_SDO); //Sent 1 to SDO
else
output_low(MMA7455_SDO); //Sent 0 to SDO
output_high(MMA7455_CLK);
output_low(MMA7455_CLK);
addr<<=1; //Shift data Next Bit
}
}
//******************************write_Acc value for set up MMA7455
void write_Acc(char reg,char dat) //reg(reg for write),dat(set up Acc)
{
output_low(MMA7455_CS); //from timing
spi_write(((reg&0x3F)<<1)|0x80); //write address data for write to SPI(th guide)
spi_write(dat); //Write data to SPI
output_high(MMA7455_CS);
}
//********************************************SPI_read
char spi_read(char reg)
{
char a,result=0;
for(a=0;a<8;a++) //write reg for read(SDO)
{
if((reg & 0x80)== 0x80) //check data bit 8 w=1 r=0
output_high(MMA7455_SDO);
else
output_low(MMA7455_SDO);
output_high(MMA7455_CLK);
output_low(MMA7455_CLK);
reg <<= 1;
}
for(a=0;a<8;a++) //read data(SDI)
{
output_high(MMA7455_CLK);
result <<= 1;
if((MMA7455_SDI && 0x08)== 0x08) //If SDI = "1"
{
result |= 0x01; //Keep Result of data-Read
output_low(MMA7455_CLK);
}
}
return(result); //Return data
}
//******************************read_Acc data
signed char read_Acc(char reg)
{
signed char dat;
output_low(MMA7455_CS);
dat=spi_read(((reg&0x3F)<<1)); //Write address command for read to SPI Accelerate
output_high(MMA7455_CS);
return(dat);
}
//************************************Check status ready
void data_ready()
{
while((MMA7455_INT1&&0x01) != 0x01){;} //Check Data Ready exit loop
}
void Acc_init(void)
{
set_tris_b(0xFF);
set_tris_c(0x20);
setup_spi(SPI_MASTER|SPI_H_TO_L|SPI_XMIT_L_TO_H|SPI_CLK_DIV_16);
output_high(MMA7455_CS);
output_high(MMA7455_SDO);
output_low(MMA7455_CLK);
delay_ms(100);
write_Acc(MCTL,0x09); //4g,meas,4wire
}
//*************************main********************
void main()
{
int Xdata,Ydata,Zdata;
Acc_init();
delay_ms(100);
while(TRUE)
{
data_ready();
Xdata = read_Acc(XOUT8);
Ydata = read_Acc(YOUT8);
Zdata = read_Acc(ZOUT8);
delay_ms(100);
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Aug 23, 2011 1:28 pm |
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Look at the .LST file. The compiler is ignoring your spi_write() and
spi_read() functions because you gave them the same names as the
built-in CCS functions. If you want it to use your functions, change
the names slightly. You could call it my_spi_write(), or spi_wrt() and
spi_rd().
Also, if you want to use your own software spi functions, then don't
call the setup_spi() function.
Also, you don't need to set the TRIS. The compiler will do it for you. |
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