maniacbug:
Oh goodness.. If Maple scares you off, I don't think there's much ARM stuff out there that will be palatable. You could TRY Simple Cortex SimpleCortex, For When An Arduino Is Too Wimpy | Hackaday Although that is a completely different chip.Anyway, I think it's safe to say that "easy" and "STM32F4" don't really go together right now.
What scared me off was all the multitude of problems people have! like remapping the peripherals etc etc! but my main argument is I want to learn how to program properley, Arduino IDE is really good for getting started but its so simplified and I think the Maple IDE is just the same good for beginners but a lot more to learn
cyclegadget:
Sorry, so far I have only got as far as changing the loaded program with one that makes the leds come on and stay on. I still have plenty to learn about the language for Atollic and STM32.Some people on LeafLabs forum have made a Maple IDE port to the STM32F4 discovery but, I have not figured out how to use it. The Maple IDE is a based on Arduino IDE but, the hardware makes programming a little different in some cases.
Well I have not given up!, I have tried Coocox CoIDE with no luck but I have had some success with Attolic True Studio, pretty straight forward process once you know what options to set etc.
So I first started uploading a program that just turned the four LEDs on and after lots of messing about I have this very basic program
#include "stm32f4_discovery.h"
int T=1000000;
GPIO_InitTypeDef GPIO_InitStructure;
void Delay(__IO uint32_t nCount);
int main(void)
{
/* GPIOD Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
/* Configure PD12, PD13, PD14 and PD15 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
while (1)
{
/* PD12 to be toggled */
GPIO_SetBits(GPIOD, GPIO_Pin_12);
/* Insert delay */
Delay(T);
/* PD13 to be toggled */
GPIO_SetBits(GPIOD, GPIO_Pin_13);
/* Insert delay */
Delay(T);
/* PD14 to be toggled */
GPIO_SetBits(GPIOD, GPIO_Pin_14);
/* Insert delay */
Delay(T);
/* PD15 to be toggled */
GPIO_SetBits(GPIOD, GPIO_Pin_15);
/* Insert delay */
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_12);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_13);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_14);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_15);
Delay(T);
GPIO_SetBits(GPIOD, GPIO_Pin_15);
Delay(T);
GPIO_SetBits(GPIOD, GPIO_Pin_14);
Delay(T);
GPIO_SetBits(GPIOD, GPIO_Pin_13);
Delay(T);
GPIO_SetBits(GPIOD, GPIO_Pin_12);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_15);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_14);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_13);
Delay(T);
GPIO_ResetBits(GPIOD, GPIO_Pin_12);
Delay(T);
}
}
void Delay(__IO uint32_t nCount)
{
while(nCount--)
{
}
}
I can upload the code and alter the delay value T, the great thing with attolic is I can debug the program and single step through which is a massive help for me to learn how a C program runs in fact this has learnt me a lot
Any other noobs need help getting this going just drop me a message and I will do my best to help, its taken me about 5 days reading and playing
I have lots of questions
void Delay(__IO uint32_t nCount)
{
while(nCount--)
{
}
}
Can anyone explain what this part does?
uint32_t is an unsigned 32 bit Int, I know what a while loop does but I dont get what that does in the code
GPIO_InitTypeDef GPIO_InitStructure;
What about this one any explanations?
Finally for today
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
I see this a lot | its the Or command yeah?, whats it do in the above line?
Many thanks for looking