nanalingS2
commented
10 months ago
/*
* This program turns on/off LED(s) on stm32f429i discovery board.
*
* Reference: http://goo.gl/7iZIVC
*
* Adrian Huang <adrianhuang0701@gmail.com>
*
*/
/*
* Reset and Clock Control Register
*/
#define RCC_ADDR 0x40023800
#define RCC_APB1ENR (*((volatile unsigned long *)(RCC_ADDR + 0x30)))
/*
* GPIOG Register
*/
#define GPIOG_ADDR 0x40021800
/* GPIOG port mode register */
#define GPIOG_MODER (*((volatile unsigned long *) (GPIOG_ADDR)))
/* GPIOG port output type register */
#define GPIOG_OTYPER (*((volatile unsigned long *) (GPIOG_ADDR + 4)))
/* GPIOG port output speed mode register */
#define GPIOG_OSPEEDR (*((volatile unsigned long *) (GPIOG_ADDR + 8)))
/* GPIOG port bit set/reset register */
#define GPIOG_BSRR (*((volatile unsigned long *)(GPIOG_ADDR + 0x18)))
/* Green LED */
#define PG13 13
asm(".word 0x20001000");
asm(".word main");
int main()
{
unsigned int c = 0;
unsigned int shift = (PG13 * 2);
RCC_APB1ENR = (1 << 6); /* GPIOGEN = 1 */
GPIOG_MODER = (1 << shift); /* 1: General purpose output mode. */
GPIOG_OSPEEDR = (1 << shift); /* 1: Medium speed. */
GPIOG_OTYPER &= ~(1 << PG13); /* 0: Output push-pull. */
while (1) {
GPIOG_BSRR = (1 << 29); /* Reset bit: OFF */
for (c = 0; c < 100000; c++);
GPIOG_BSRR = (1 << PG13); /* Set bit: ON */
for (c = 0; c < 100000; c++);
}
return 0;
}
/*
*/
/*
define RCC_ADDR 0x40023800
define RCC_APB1ENR (((volatile unsigned long )(RCC_ADDR + 0x30)))
/*
define GPIOG_ADDR 0x40021800
/ GPIOG port mode register /
define GPIOG_MODER (((volatile unsigned long ) (GPIOG_ADDR)))
/ GPIOG port output type register /
define GPIOG_OTYPER (((volatile unsigned long ) (GPIOG_ADDR + 4)))
/ GPIOG port output speed mode register /
define GPIOG_OSPEEDR (((volatile unsigned long ) (GPIOG_ADDR + 8)))
/ GPIOG port bit set/reset register /
define GPIOG_BSRR (((volatile unsigned long )(GPIOG_ADDR + 0x18)))
/ Green LED /
define PG13 13
asm(".word 0x20001000"); asm(".word main");
int main() { unsigned int c = 0; unsigned int shift = (PG13 * 2);
}