No Debugging possible

nik · ‎2007-09-13

Posted on September 14, 2007 at 06:14

nik · ‎2011-05-17

Posted on May 17, 2011 at 09:46

Hi,

I am making myself familiar with the ADC as I will need it for a future project.

Everything compiles fine and should work in my opinion. But when trying to debug (to see the ADC value), debugging is cancelled and after that I have to do an erase reset.

As I am a beginner in uC programming, all information I got was the Software Library Doc and Reference Manual. It is not clear to me, whether I have to use a timer for the ADC.

I am using MCBSTR9 from Keil with uVision.

Any help is appreciated!

Cheers

Nik

--- Code ---

#include

#include ''main.h''

int main (void){

u16 ADC_Conversion = 0;

setup();

ADC_ConversionCmd(ADC_Conversion_Start);

wait(300);

while(1){

while(ADC_GetFlagStatus(ADC_FLAG_ECV)==RESET);

ADC_Conversion = ADC_GetConversionValue(ADC_Channel_0);

ADC_ClearFlag(ADC_FLAG_ECV);

}

return 0;

}

void setup(void){

// Variables

ADC_InitTypeDef ADC_Setup;

GPIO_InitTypeDef GPIO_Setup;

// Clocks

SCU_MCLKSourceConfig(SCU_MCLK_OSC);

SCU_PLLFactorsConfig(192,25,2);

SCU_PLLCmd(ENABLE);

SCU_MCLKSourceConfig(SCU_MCLK_PLL);

SCU_PCLKDivisorConfig(SCU_PCLK_Div2);

SCU_APBPeriphClockConfig(__ADC, ENABLE);

SCU_APBPeriphClockConfig(__GPIO4, ENABLE);

// Configuration

ADC_DeInit();

ADC_StructInit(&ADC_Setup);

ADC_Setup.ADC_Channel_0_Mode = ADC_NoThreshold_Conversion;

ADC_Setup.ADC_Conversion_Mode = ADC_Continuous_Mode;

ADC_Cmd(ENABLE);

ADC_PrescalerConfig(0x0);

GPIO_DeInit(GPIO4);

GPIO_StructInit(&GPIO_Setup);

GPIO_Setup.GPIO_IPConnected = GPIO_IPConnected_Enable;

GPIO_ANAPinConfig(GPIO_ANAChannel0, ENABLE);

// Setup

ADC_Init(&ADC_Setup);

GPIO_Init(GPIO4, &GPIO_Setup);

}

void wait(int time){

int count=0;

time *= 100000; // time in ms

while(count

}

[ This message was edited by: Liqnik on 13-09-2007 16:14 ]

mark9 · ‎2011-05-17

Posted on May 17, 2011 at 09:46

Your ADC clock might be running too fast. If I read the code correctly, it looks like your PLL is 96MHz, the PCLK is 48MHz, and ADC clock is 48MHz. The datasheets says the ADC is limited to 25MHz.

[ This message was edited by: lakata on 14-09-2007 19:58 ]

nik · ‎2011-05-17

Posted on May 17, 2011 at 09:46

Hi,

thanks for the hint. It solved part of the problem.

I changed the prescaler to 0x2. As I am running the program now, it stucks in the while(ADC_GetFlagStatus(ADC_FLAG_ECV)==RESET)... I wonder why this flag does not get set. I do not need to configure an interrupt for it, do I?

Cheers

Nik

nik · ‎2011-05-17

Posted on May 17, 2011 at 09:46

Hi,

to specify my question: is it possible at all to use the ADC without configuring interrupts? My understanding was, that the chip does produce some kind of hardware interrupt to set the ECV flag even when it is ''stuck'' in a software loop.

--- pseudo code ---

while(1){

start_conversion();

while(conversionflag not set) {wait}; // flag gets set in background when conversion is finished

value = conversion(value);

clear_flag(ECV);

}

--- end pseudo code ---

Cheers

Nik

[ This message was edited by: Liqnik on 14-09-2007 09:45 ]

2nd Edit:

Never mind. I forgot to set the STR bit...

[ This message was edited by: Liqnik on 14-09-2007 09:58 ]