ad9850

[sfiber]

hi friends I use stm32f4 and I try this code with ad9850 module.
but there is a problem I think.Because when I debug data_to_load and frequency_to_load parameters never take a value.
can you check this and if you have a sample code can you share with me

Code: [Select]

#include "stm32f4_discovery.h"

//d8 w_clk
//d9 frequency update
//d10 data
//d11 reset

GPIO_InitTypeDef GPIO_InitStructure;
int i,b;
void delay(uint32_t count);
void Load_Frequency(long long frequency_to_load);
void load_bytes(uint16_t data_to_load);
void PIN_Initing(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_15;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);
}

void load_bytes(uint16_t data_to_load)
{
for(i=0;i<8;i++,data_to_load>>=1)
{
GPIO_WriteBit(GPIOD,GPIO_Pin_10,(data_to_load & 0x01));
GPIO_SetBits(GPIOD,GPIO_Pin_8);
delay(0x00000010);
GPIO_ResetBits(GPIOD,GPIO_Pin_8);
}
}

void Load_Frequency(long long frequency_to_load)
{
long long freq=frequency_to_load*4294967295/125000000;
for(b=0;b<4;b++,freq>>=8)
{
load_bytes(freq & 0xFF);
}
delay(0x0000050);
load_bytes(0x0000);
GPIO_SetBits(GPIOD,GPIO_Pin_9);
}
void delay(uint32_t count)
{
while(count--)
{

}
}

int main(void)
{
PIN_Initing();
GPIO_SetBits(GPIOD,GPIO_Pin_15);
GPIO_SetBits(GPIOD,GPIO_Pin_11);
GPIO_SetBits(GPIOD,GPIO_Pin_8);
GPIO_SetBits(GPIOD,GPIO_Pin_9);
delay(0x0000F00);
Load_Frequency(10.e6);
  while(1)
{}
}


[dannyf]

Why do you think they never take a value?

[bwat]

Code: [Select]

Load_Frequency(10.e6);


Efendim, 10.e6 bir "float" ama bir "long long" istiyorsunuz, degil mi?

[sfiber]

Code: [Select]

Load_Frequency(10.e6);


Efendim, 10.e6 bir "float" ama bir "long long" istiyorsunuz, degil mi?

I tried wtih double but nothing changed

[bwat]

Why would you try with a double? Why not use a long long just like the function is specified to take as an argument?

[sfiber]

Why would you try with a double? Why not use a long long just like the function is specified to take as an argument?

what do you offer me to use

[bwat]

Why would you try with a double? Why not use a long long just like the function is specified to take as an argument?

what do you offer me to use

A long long perhaps? Basically, any integer type with at least 25 bits of precision will do since:

Code: [Select]

| ?- X is 1+ceiling(ln(10.0e6)/ln(2)).
X = 25 ?

Edit: My original formula was off by one!!! Fixed.

[sfiber]

Why would you try with a double? Why not use a long long just like the function is specified to take as an argument?

what do you offer me to use

A long long perhaps? Basically, any integer type with at least 25 bits of precision will do since:

Code: [Select]

| ?- X is 1+ceiling(ln(10.0e6)/ln(2)).
X = 25 ?

do you have a source code to use

Edit: My original formula was off by one!!! Fixed.

[bwat]

do you have a source code to use

1) You've misunderstood what I'm saying. Just use 10000000 instead of 10.0e6.
2) I should have used floor and not ceiling. I managed to mess up that simple formula twice!

[dannyf]

10.e6 bir "float" ama bir "long long" istiyorsunuz, degil mi?

The compiler, assuming that it is reasonably competent, would have done that conversion.

So it is not the problem - well, it shouldn't be the problem.

The OP never established why s/he thought the variables were not taking the values s/he expected them to.

[sfiber]

10.e6 bir "float" ama bir "long long" istiyorsunuz, degil mi?

The compiler, assuming that it is reasonably competent, would have done that conversion.

So it is not the problem - well, it shouldn't be the problem.

The OP never established why s/he thought the variables were not taking the values s/he expected them to.

yes completely true.variables dont take value.when I added them to watch window I can only see "not in scope".I never met problem like this.

[dannyf]

I never met problem like this.

We cannot help you if you refuse to help us help you.

[bwat]

10.e6 bir "float" ama bir "long long" istiyorsunuz, degil mi?

The compiler, assuming that it is reasonably competent, would have done that conversion.

So it is not the problem - well, it shouldn't be the problem.

I agree it's probably not the source of his problem. I pointed it out as the conversion from a float to an int can be a source of undefined behaviour according to K&R 2nd edition. It was something he needed to sort out.

[abyrvalg]

Looks like you are trying to watch local variables outside of functions they belong to. Set a breakpoint INSIDE the Load_frequency() function - there you should see the frequency_to_load var w/o any problems. Same for data_to_load - it does exist only inside the load_data() function.
Note: you may need a second delay - after gpio_resetbits in load_data().