ADC problem about ADUC7061

Hi,

You mentioned that CH4 is working while CH8 is not but looking at the configuration below, there is another difference. You bypass both buffer when reading from CH4. Can you try to bypass the buffer when using CH8 as well? This is just to check if we have an issue with the buffer. 

ADC1CON = 0x8004 | 0x0480;//ch 8
//ADC1CON = 0x800c | 0x0300;//ch 4

Also, I think the lines below can be skipped.

GP0CON0 = 0x00000000; //p0.0~p0.4 gpio
GP0PAR = 0x0f; //01110
GP0DAT = 0x10100000;

regards,

Mark

I have checked it for several weeks,

In facts, the ADC is correct. the reason to make wrong data of ADC is that the DAC will not work when P0 is configured as analogue input. the DAC will not ouput linear voltage.

Finally, when USE jlink, device works correctly after programming, but will not work correctly after reset again by power off and on.

when use ULINK, device work incorrectly after programming, but it will work in debug mode, run or step by step. if the devcei is resetted again by poweroff/on, the devcei will not work correctly again.

Hi,
I have gone through the code and added some comments to it. I will suggest to disable the SPI/I2C blocks when converting from ADC. Also please take note of the device selection on your compiler, use ADuC7061 instead of ADuC7060. What compiler are you using?

int main()
{
volatile signed long s;
signed char N = -1;
char Err = 0;
float fN = 0;

PLLKEY1 = 0xaa;
PLLCON = 0x00;
PLLKEY2 = 0x55;

POWKEY1 = 0x1;
POWCON0 = 0x38; // Set core to max CPU speed of 10.24Mhz
POWKEY2 = 0xF4;

POWKEY3 = 0x76;
POWCON1 = 0x024; --> Please use 0x020 this if using ADC6 to 9
POWKEY4 = 0xB1;

DACCON = 0x0013;
DACDAT = 0x04ff0000;

while(1)
{

GP0CON0 = 0x00000000; //p0.0~p0.4 gpio
GP0PAR = 0x0f; //01110
GP0DAT = 0x10100000;

GP0KEY1 = 0x7;
GP0CON1 = 0x1; // adc
GP0KEY2 = 0x13;

ADCCFG = 0x84; -->Moved after GPIO CFG
ADCFLT = 0x8083;
ADC0CON = 0;
ADC1CON = 0x878c; --> This is an internal short to ADC3. Are you measuring ADC3 intentionally?

s = ADCSTA;
s = ADC0DAT;
s = ADC1DAT;
//////////
ADCMDE = 0x83; //idle mode
////
ADC1CON = 0x8004 | 0x0480;//ch 8 -> Measuring from CH8, is ADC5 biased with 0.1V?
//ADC1CON = 0x800c | 0x0300;//ch 4 -> Measuring from CH4, is ADC5 biased with 0.1V? Note the gain difference

s = ADC1DAT;
s = ADCSTA;
ADCMDE = 0x82;

do
{
s = ADCSTA;
if (s & 0x2000) //adc1cerr
{
Err |= 1; //over range
}
} while(!(s & 0x2));

s = ADC1DAT;
ADCMDE = 0x83; //idle

//3. exit adc
ADCMDE = 0x83; //idle
ADCFLT = 0x80ff;
ADC1CON = 0x78c; //internally shorted

GP0CON0 = 0x00001011; //back to spi
GP0PAR = 0x04;
GP0DAT = 0x10100000;

GP0KEY1 = 0x7;
GP0CON1 = 0x0; // exit adc
GP0KEY2 = 0x13;
}

void DelayMs(long d)
{
long i, j;
for (j=0; j<d; j++)
{
for (i=0; i<900; i++)
{
//T2CLRI = 0x55;
}
}
}
void SetDacInmv(signed short mV)
{
signed long v;
signed long vdac;
v = mV;
vdac = (v * 4095) / 1200; //by Vdd=2.5V
vdac <<= 16;
if (vdac > 0xfff0000)
{
vdac = 0xfff0000;
}
DACCON = 0x10;
DACDAT = vdac;
}

int main()
{
SetDacInmv(0);
while(1)
{
// T2CLRI = 0x55;
GP0KEY1 = 0x7;
GP0CON1 = 0x1;
GP0KEY2 = 0x13;
SetDacInmv(1200);
DelayMs(5);
SetDacInmv(600);
DelayMs(5);

SetDacInmv(0);
DelayMs(5);
GP0KEY1 = 0x7;
GP0CON1 = 0x0;
GP0KEY2 = 0x13;
SetDacInmv(1200);
DelayMs(5);
SetDacInmv(600);
DelayMs(5);

SetDacInmv(0);
DelayMs(10);
}
}

void DelayMs(long d)
{
long i, j;
for (j=0; j<d; j++)
{
for (i=0; i<900; i++)
{
//T2CLRI = 0x55;
}
}
}
void SetDacInmv(signed short mV)
{
signed long v;
signed long vdac;
v = mV;
vdac = (v * 4095) / 1200; //by Vdd=2.5V
vdac <<= 16;
if (vdac > 0xfff0000)
{
vdac = 0xfff0000;
}
DACCON = 0x10;
DACDAT = vdac;
}

int main()
{
SetDacInmv(0);
while(1)
{
// T2CLRI = 0x55;
GP0KEY1 = 0x7;
GP0CON1 = 0x1;
GP0KEY2 = 0x13;
SetDacInmv(1200);
DelayMs(5);
SetDacInmv(600);
DelayMs(5);

SetDacInmv(0);
DelayMs(5);
GP0KEY1 = 0x7;
GP0CON1 = 0x0;
GP0KEY2 = 0x13;
SetDacInmv(1200);
DelayMs(5);
SetDacInmv(600);
DelayMs(5);

SetDacInmv(0);
DelayMs(10);
}
}