MCBSTM32C/Blinky simple - Revision history

Heth at 08:29, 19 September 2011

2011-09-19T08:29:03Z

Heth: /* Assembler file: startup.c */

2011-09-19T08:19:35Z

‎Assembler file: startup.c

Heth: /* C-File: main.c */

2011-08-29T15:20:13Z

‎C-File: main.c

Heth at 06:58, 29 August 2011

2011-08-29T06:58:27Z

Heth: Created page with "=Assembler file: startup.c= ; Minimum startup from startup_stm32f10x_cl.s ; Author: heth@mercantec.dk ; Revision 1 - 29-aug-2011 ;Define Stack Stack_Size ..."

2011-08-29T06:42:49Z

Created page with "=Assembler file: startup.c= <source lang=asm> ; Minimum startup from startup_stm32f10x_cl.s ; Author: heth@mercantec.dk ; Revision 1 - 29-aug-2011 ;Define Stack Stack_Size ..."

New page

=Assembler file: startup.c=
<source lang=asm>
; Minimum startup from startup_stm32f10x_cl.s
; Author: heth@mercantec.dk
; Revision 1 - 29-aug-2011

;Define Stack
Stack_Size EQU 0x00000200

AREA STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem SPACE Stack_Size
__initial_sp

;Define Heapsize
Heap_Size EQU 0x00000000

AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit

AREA RESET, DATA, READONLY
EXPORT __initial_sp
EXPORT __heap_base
EXPORT __heap_limit

EXPORT __Vectors
EXPORT __Vectors_End
EXPORT __Vectors_Size

PRESERVE8
THUMB ; Use THUMB instruction set

; Vector Table Mapped to Address 0 at Reset
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
__Vectors_End

__Vectors_Size EQU __Vectors_End - __Vectors

; Not nessesary HeTh IMPORT __use_two_region_memory
; Code start
AREA startup, CODE, READONLY

;ENTRY
; Reset Handler (Line 150)

Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT __main
LDR R0, =__main
BX R0
ENDP

END
</source>
=Headerfile: minimum gpio.h=
<source lang=c>

/****************************************************************
* Author: heth@mercantec.dk
* Revision 1 - 29-aug-2011
*****************************************************************
* Minimum setup of GPIO
****************************************************************/

//related definitions from stdint.h
typedef unsigned int uint32_t;

// GPIO related definitions in stm32f10x_cl.h
#define PERIPH_BASE (( uint32_t)0x40000000)
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000)

#define GPIOA_BASE (APB2PERIPH_BASE + 0x0800)
#define GPIOB_BASE (APB2PERIPH_BASE + 0x0C00)
#define GPIOC_BASE (APB2PERIPH_BASE + 0x1000)
#define GPIOD_BASE (APB2PERIPH_BASE + 0x1400)
#define GPIOE_BASE (APB2PERIPH_BASE + 0x1800)

#define __IO volatile /*!< defines 'read / write' permissions */

typedef struct
{
__IO uint32_t CRL;
__IO uint32_t CRH;
__IO uint32_t IDR;
__IO uint32_t ODR;
__IO uint32_t BSRR;
__IO uint32_t BRR;
__IO uint32_t LCKR;
} GPIO_TypeDef;

#define GPIOA ((GPIO_TypeDef *) GPIOA_BASE )
#define GPIOB ((GPIO_TypeDef *) GPIOB_BASE )
#define GPIOC ((GPIO_TypeDef *) GPIOC_BASE )
#define GPIOD ((GPIO_TypeDef *) GPIOD_BASE )
#define GPIOE ((GPIO_TypeDef *) GPIOE_BASE )

// RCC - Reset and Clock Control
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000)
#define RCC_BASE (AHBPERIPH_BASE + 0x1000)
#define RCC ((RCC_TypeDef *) RCC_BASE )
typedef struct
{
__IO uint32_t CR;
__IO uint32_t CFGR;
__IO uint32_t CIR;
__IO uint32_t APB2RSTR;
__IO uint32_t APB1RSTR;
__IO uint32_t AHBENR;
__IO uint32_t APB2ENR;
__IO uint32_t APB1ENR;
__IO uint32_t BDCR;
__IO uint32_t CSR;
__IO uint32_t AHBSTR;
__IO uint32_t CFGR2;
} RCC_TypeDef;
</source>
=C-File: main.c=
<source lang=c>

//Main
/****************************************************************
* Author: heth@mercantec.dk
* Revision 1 - 29-aug-2011
*****************************************************************
* Minimum setup of GPIO
****************************************************************/
#include "minimum gpio.h"

#define forward 1
#define backward 0

//Define bitmask for LED's
const long led_on[] = { 0x100, 0x200,0x400,0x800,0x1000,0x2000,0x4000,0x8000 };
const long led_off[] = { 0x1000000, 0x2000000,0x4000000,0x8000000,0x10000000,
0x20000000,0x40000000,0x80000000 };

int main (void) {
int j;

int led = 0; //Start with first LED ( 0 throug 7 as defined in led_mask)
int direction=forward;

// Start Clock on GPIO Port E
RCC->APB2ENR |= 1 << 6; // Bit 6 = Enable IO Port E Clock

GPIOE->CRH=0x33333333;
//GPIOE->ODR=0xf0f0;
while (1) {
for ( j=0; j <= 100000 ; j++); //Loop for pause

GPIOE->BSRR = led_off[led]; //Turn off Current Led

//Forward Direction
if ( direction == forward ) {
if ( led == 7 ) { // Finish in forward direction?
direction = backward;
} else {
led++; // Next led forward
GPIOE->BSRR = led_on[led];
}
}

//Backward Direction
if ( direction == backward ) {
if ( led == 0 ) { // Finish in forward direction
direction = forward;
} else {
led--; // Next led backward
GPIOE->BSRR = led_on[led];
}
}

}
}
</source>
[[Category:ARM]]

@@ Line 1: / Line 1: @@
 A simpe program thats blinks the eight LED's on Keil's [[MCBSTM32C]] board using the [[STM32F107VC/GPIO|GPIO]] Port-E[15:8]. See [http://www.keil.com/mcbstm32c/mcbstm32c-base-board-schematics.pdf Schematics]
 =Assembler file: startup.s=
 <source lang=asm>

← Older revision		Revision as of 06:58, 29 August 2011
Line 1:		Line 1:
		+	A simpe program thats blinks the eight LED's on Keil's [[MCBSTM32C]] board using the [[STM32F107VC/GPIO\|GPIO]] Port-E[15:8]. See [http://www.keil.com/mcbstm32c/mcbstm32c-base-board-schematics.pdf Schematics]
	=Assembler file: startup.c=		=Assembler file: startup.c=
	<source lang=asm>		<source lang=asm>

@@ Line 1: / Line 1: @@
 A simpe program thats blinks the eight LED's on Keil's [[MCBSTM32C]] board using the [[STM32F107VC/GPIO|GPIO]] Port-E[15:8]. See [http://www.keil.com/mcbstm32c/mcbstm32c-base-board-schematics.pdf Schematics]
-=Assembler file: startup.c=
+=Assembler file: startup.s=
 <source lang=asm>
 ; Minimum startup from startup_stm32f10x_cl.s
@@ Line 61: / Line 61: @@
 		END
 </source>
 =Headerfile: minimum gpio.h=
 <source lang=c>

@@ Line 125: / Line 125: @@
 =C-File: main.c=
 <source lang=c>
 //Main
 /****************************************************************
@@ Line 135: / Line 134: @@
 #include "minimum gpio.h"
-#define forward	1
+#define FORWARD	1
-#define backward 0
+#define BACKWARD 0
-//Define bitmask for LED's
+//Setting BSRR bit 8 to 15 bitmasks	(lowest 16 bit set bits on)
-const long led_on[] = { 0x100, 0x200,0x400,0x800,0x1000,0x2000,0x4000,0x8000 };
+// LED's are attached to bit 8 to 15 on the evaluation board.
-const long led_off[] = { 0x1000000, 0x2000000,0x4000000,0x8000000,0x10000000,
+const long led_on[]  = { 0x00000100, // PORT-E bit  8 ON
-x20000000,0x40000000,0x80000000 };
+x00000200, // PORT-E bit  9 ON
@@ Line 149: / Line 178: @@
 	int j;
-	int led = 0; //Start with first LED ( 0 throug 7 as defined in led_mask)
+	//led = Light Emitting Diode
-	int direction=forward;
+	int led = 0; //Start with first LED ( 0 throug 7 as defined in led_on and led_off)
-	// Start Clock on GPIO Port E
+	// Start Clock on GPIO Port E (Enable port E)
 	RCC->APB2ENR |=  1 <<  6;	// Bit 6 = Enable IO Port E Clock
 	GPIOE->CRH=0x33333333;
-	//GPIOE->ODR=0xf0f0;
-	while (1) {
+	while (1) { 		// Do forever
 		for ( j=0; j <= 100000 ; j++); //Loop for pause
@@ Line 163: / Line 194: @@
 		//Forward Direction
-		if ( direction == forward ) {
+		if ( direction == FORWARD ) {
 			if ( led == 7 ) { // Finish in forward direction?
-				direction = backward;
+				direction = BACKWARD;
 			} else {
 				led++; // Next led forward
@@ Line 173: / Line 204: @@
 		//Backward Direction
-		if ( direction == backward ) {
+		if ( direction == BACKWARD ) {
 			if ( led == 0 ) { // Finish in forward direction
-				direction = forward;
+				direction = FORWARD;
 			} else {
 				led--; // Next led backward
@@ Line 181: / Line 212: @@
+			}
+		}
+	}
+}
 </source>
 [[Category:ARM]]