mirror of
https://github.com/rfivet/stm32bringup.git
synced 2024-11-16 17:46:07 -05:00
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
|
/* ledon.c -- user LED on
|
||
|
|
** Copyright (c) 2020 Renaud Fivet
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Memory locations defined by linker script */
|
||
|
|
extern long __StackTop ; /* &__StackTop points after end of stack */
|
||
|
|
void Reset_Handler( void) ; /* Entry point for execution */
|
||
|
|
|
||
|
|
/* Interrupt vector table:
|
||
|
|
* 1 Stack Pointer reset value
|
||
|
|
* 15 System Exceptions
|
||
|
|
* NN Device specific Interrupts
|
||
|
|
*/
|
||
|
|
typedef void (*isr_p)( void) ;
|
||
|
|
isr_p const isr_vector[ 2] __attribute__((section(".isr_vector"))) = {
|
||
|
|
(isr_p) &__StackTop,
|
||
|
|
/* System Exceptions */
|
||
|
|
Reset_Handler
|
||
|
|
} ;
|
||
|
|
|
||
|
|
#define RCC ((volatile long *) 0x40021000)
|
||
|
|
#define RCC_AHBENR RCC[ 5]
|
||
|
|
#define RCC_AHBENR_IOPBEN 0x00040000 /* 18: I/O port B clock enable */
|
||
|
|
|
||
|
|
#define GPIOB ((volatile long *) 0x48000400)
|
||
|
|
#define GPIOB_MODER GPIOB[ 0]
|
||
|
|
|
||
|
|
void Reset_Handler( void) {
|
||
|
|
/* User LED ON */
|
||
|
|
RCC_AHBENR |= RCC_AHBENR_IOPBEN ; /* Enable IOPB periph */
|
||
|
|
GPIOB_MODER |= 1 << (1 * 2) ; /* PB1 Output [01], over default 00 */
|
||
|
|
/* OTYPER Push-Pull by default */
|
||
|
|
/* PB1 output default LOW at reset */
|
||
|
|
for( ;;) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* end of ledon.c */
|