mirror of
https://github.com/rfivet/stm32bringup.git
synced 2024-12-17 22:36:24 -05:00
uptime -- tells how long the system has been running
This commit is contained in:
parent
3d6cd1bdc2
commit
fd13d29f0c
3
Makefile
3
Makefile
@ -30,7 +30,8 @@ PROJECT = f030f4
|
||||
#SRCS = startup.c init.c success.c
|
||||
#SRCS = startup.c board.c success.c
|
||||
#SRCS = startup.c usart1tx.c hello.c
|
||||
SRCS = startup.c uplow.1.c uptime.1.c
|
||||
#SRCS = startup.c uplow.1.c uptime.1.c
|
||||
SRCS = startup.c uplow.2.c uptime.c printf.c putchar.c
|
||||
OBJS = $(SRCS:.c=.o)
|
||||
CPU = -mthumb -mcpu=cortex-m0
|
||||
CFLAGS = $(CPU) -g -Wall -Wextra -Os
|
||||
|
||||
77
printf.c
Normal file
77
printf.c
Normal file
@ -0,0 +1,77 @@
|
||||
/* printf.c -- format and print data */
|
||||
/* Copyright (c) 2020 Renaud Fivet */
|
||||
|
||||
#include <stdarg.h>
|
||||
#include <stdio.h>
|
||||
#include "system.h" /* kputc(), kputs() */
|
||||
|
||||
static int kputu( unsigned u, unsigned d) {
|
||||
char s[ 12] ; /* room for 11 octal digit + EOS */
|
||||
char *p = &s[ sizeof s - 1] ; /* point to last byte */
|
||||
|
||||
*p = 0 ; /* null terminated string */
|
||||
do {
|
||||
unsigned r = u % d ;
|
||||
u /= d ;
|
||||
*--p = "0123456789ABCDEF"[ r] ;
|
||||
} while( u) ;
|
||||
|
||||
return kputs( p) ;
|
||||
}
|
||||
|
||||
static int kputi( int i) {
|
||||
int flag = i < 0 ;
|
||||
if( flag) {
|
||||
i = -i ;
|
||||
kputc( '-') ;
|
||||
}
|
||||
|
||||
return flag + kputu( i, 10) ;
|
||||
}
|
||||
|
||||
int printf( const char *fmt, ...) {
|
||||
va_list ap ;
|
||||
int cnt = 0 ;
|
||||
int c ; /* current char in format string */
|
||||
|
||||
va_start( ap, fmt) ;
|
||||
while( ( c = *fmt++) != 0)
|
||||
if( c != '%') {
|
||||
cnt += 1 ; kputc( c) ;
|
||||
} else if( ( c = *fmt++) == 0) {
|
||||
cnt += 1 ; kputc( '%') ;
|
||||
break ;
|
||||
} else
|
||||
switch( c) {
|
||||
case 'c':
|
||||
cnt += 1 ; kputc( va_arg( ap, int /* char */)) ;
|
||||
break ;
|
||||
case 'o':
|
||||
cnt += kputu( va_arg( ap, unsigned), 8) ;
|
||||
break ;
|
||||
case 'u':
|
||||
cnt += kputu( va_arg( ap, unsigned), 10) ;
|
||||
break ;
|
||||
case 'x':
|
||||
case 'X':
|
||||
cnt += kputu( va_arg( ap, unsigned), 16) ;
|
||||
break ;
|
||||
case 'i':
|
||||
case 'd':
|
||||
cnt += kputi( va_arg( ap, int)) ;
|
||||
break ;
|
||||
case 's':
|
||||
cnt += kputs( va_arg( ap, char *)) ;
|
||||
break ;
|
||||
default:
|
||||
cnt += 1 ; kputc( '%') ;
|
||||
/* fallthrough */
|
||||
case '%':
|
||||
cnt += 1 ; kputc( c) ;
|
||||
}
|
||||
|
||||
va_end( ap) ;
|
||||
return cnt ;
|
||||
}
|
||||
|
||||
/* end of printf.c */
|
||||
12
putchar.c
Normal file
12
putchar.c
Normal file
@ -0,0 +1,12 @@
|
||||
/* putchar.c -- write a character to stdout */
|
||||
/* Copyright (c) 2020 Renaud Fivet */
|
||||
|
||||
#include <stdio.h>
|
||||
#include "system.h" /* kputc() */
|
||||
|
||||
int putchar( int c) {
|
||||
kputc( c) ;
|
||||
return c ;
|
||||
}
|
||||
|
||||
/* end of putchar.c */
|
||||
12
system.h
Normal file
12
system.h
Normal file
@ -0,0 +1,12 @@
|
||||
/* system.h -- system services */
|
||||
/* Copyright (c) 2020 Renaud Fivet */
|
||||
|
||||
extern volatile unsigned uptime ; /* seconds elapsed since boot */
|
||||
|
||||
int init( void) ; /* System initialization, called once at startup */
|
||||
|
||||
void kputc( unsigned char c) ; /* character output */
|
||||
int kputs( const char s[]) ; /* string output */
|
||||
void yield( void) ; /* give way */
|
||||
|
||||
/* end of system.h */
|
||||
124
uplow.2.c
Normal file
124
uplow.2.c
Normal file
@ -0,0 +1,124 @@
|
||||
/* uplow.2.c -- uptime lower layer
|
||||
** Copyright (c) 2020 Renaud Fivet
|
||||
**
|
||||
** implements system.h interface
|
||||
** uptime = seconds elapsed since boot
|
||||
** SysClck 8MHz HSI based, baudrate 9600, Busy wait transmission
|
||||
** user LED toggled every second
|
||||
** SysTick interrupt every second
|
||||
*/
|
||||
|
||||
#include "system.h" /* implements system.h */
|
||||
|
||||
#define SYSTICK ((volatile long *) 0xE000E010)
|
||||
#define SYSTICK_CSR SYSTICK[ 0]
|
||||
#define SYSTICK_RVR SYSTICK[ 1]
|
||||
#define SYSTICK_CVR SYSTICK[ 2]
|
||||
|
||||
#define CAT( a, b) a##b
|
||||
#define HEXA( a) CAT( 0x, a)
|
||||
#define RCC ((volatile long *) 0x40021000)
|
||||
#define RCC_AHBENR RCC[ 5]
|
||||
#define RCC_AHBENR_IOP( h) (1 << (17 + HEXA( h) - 0xA))
|
||||
#define RCC_APB2ENR RCC[ 6]
|
||||
#define RCC_APB2ENR_USART1EN 0x00004000 /* 14: USART1 clock enable */
|
||||
|
||||
#define GPIOA ((volatile long *) 0x48000000)
|
||||
#define GPIOB ((volatile long *) 0x48000400)
|
||||
#define GPIO( x) CAT( GPIO, x)
|
||||
#define MODER 0
|
||||
#define ODR 5
|
||||
#define AFRH 9
|
||||
|
||||
#define USART1 ((volatile long *) 0x40013800)
|
||||
#define CR1 0 /* Config */
|
||||
#define BRR 3 /* Baudrate */
|
||||
#define ISR 7 /* Interrupt and Status */
|
||||
#define TDR 10 /* Transmit Data */
|
||||
#define USART_CR1_TE 8 /* 3: Transmit Enable */
|
||||
#define USART_CR1_RE 4 /* 2: Receive Enable */
|
||||
#define USART_CR1_UE 1 /* 0: USART Enable */
|
||||
#define USART_ISR_TXE (1 << 7) /* 7: Transmit Data Register Empty */
|
||||
|
||||
/* user LED ON when PA4 is high */
|
||||
#define LED_IOP A
|
||||
#define LED_PIN 4
|
||||
#define LED_ON 1
|
||||
|
||||
void kputc( unsigned char c) { /* character output */
|
||||
static unsigned char lastc ;
|
||||
|
||||
if( c == '\n' && lastc != '\r')
|
||||
kputc( '\r') ;
|
||||
|
||||
/* Active wait while transmit register is full */
|
||||
while( (USART1[ ISR] & USART_ISR_TXE) == 0) ;
|
||||
|
||||
USART1[ TDR] = c ;
|
||||
lastc = c ;
|
||||
}
|
||||
|
||||
int kputs( const char s[]) { /* string output */
|
||||
int cnt = 0 ;
|
||||
int c ;
|
||||
|
||||
while( (c = *s++) != 0) {
|
||||
kputc( c) ;
|
||||
cnt += 1 ;
|
||||
}
|
||||
|
||||
return cnt ;
|
||||
}
|
||||
|
||||
void yield( void) { /* give way */
|
||||
__asm( "WFI") ; /* Wait for System Tick Interrupt */
|
||||
}
|
||||
|
||||
volatile unsigned uptime ; /* seconds elapsed since boot */
|
||||
|
||||
#ifdef LED_ON
|
||||
static void userLEDtoggle( void) {
|
||||
GPIO( LED_IOP)[ ODR] ^= 1 << LED_PIN ; /* Toggle User LED */
|
||||
}
|
||||
#endif
|
||||
|
||||
void SysTick_Handler( void) {
|
||||
uptime += 1 ;
|
||||
#ifdef LED_ON
|
||||
userLEDtoggle() ;
|
||||
#endif
|
||||
}
|
||||
|
||||
int init( void) {
|
||||
/* By default SYSCLK == HSI [8MHZ] */
|
||||
|
||||
/* SYSTICK */
|
||||
SYSTICK_RVR = 1000000 - 1 ; /* HBA / 8 */
|
||||
SYSTICK_CVR = 0 ;
|
||||
SYSTICK_CSR = 3 ; /* HBA / 8, Interrupt ON, Enable */
|
||||
/* SysTick_Handler will execute every 1s from now on */
|
||||
|
||||
#ifdef LED_ON
|
||||
/* User LED ON */
|
||||
RCC_AHBENR |= RCC_AHBENR_IOP( LED_IOP) ; /* Enable IOPx periph */
|
||||
GPIO( LED_IOP)[ MODER] |= 1 << (LED_PIN * 2) ; /* LED_IO Output [01],
|
||||
** over default 00 */
|
||||
/* OTYPER Push-Pull by default */
|
||||
/* Pxn output default LOW at reset */
|
||||
# if LED_ON
|
||||
userLEDtoggle() ;
|
||||
# endif
|
||||
#endif
|
||||
|
||||
/* USART1 9600 8N1 */
|
||||
RCC_AHBENR |= RCC_AHBENR_IOP( A) ; /* Enable GPIOA periph */
|
||||
GPIOA[ MODER] |= 0x0A << (9 * 2) ; /* PA9-10 ALT 10, over default 00 */
|
||||
GPIOA[ AFRH] |= 0x110 ; /* PA9-10 AF1 0001, over default 0000 */
|
||||
RCC_APB2ENR |= RCC_APB2ENR_USART1EN ;
|
||||
USART1[ BRR] = 8000000 / 9600 ; /* PCLK [8MHz] */
|
||||
USART1[ CR1] |= USART_CR1_UE | USART_CR1_TE ; /* Enable USART & Tx */
|
||||
|
||||
return 0 ;
|
||||
}
|
||||
|
||||
/* end of uplow.2.c */
|
||||
@ -1,4 +1,4 @@
|
||||
/* uptime.1.c --tells how long the system has been running
|
||||
/* uptime.1.c -- tells how long the system has been running
|
||||
** Copyright (c) 2020 Renaud Fivet
|
||||
**
|
||||
** v1 displays the number of seconds elapsed since boot
|
||||
|
||||
47
uptime.c
Normal file
47
uptime.c
Normal file
@ -0,0 +1,47 @@
|
||||
/* uptime.c -- tells how long the system has been running */
|
||||
/* Copyright (c) 2020 Renaud Fivet */
|
||||
|
||||
#include <stdio.h>
|
||||
#include "system.h" /* uptime, yield() */
|
||||
|
||||
static void display( unsigned u, const char *s) {
|
||||
if( u)
|
||||
printf( " %d %s%s", u, s, &"s"[ u <= 1]) ;
|
||||
}
|
||||
|
||||
int main( void) {
|
||||
static unsigned last ;
|
||||
|
||||
for( ;;)
|
||||
if( last != uptime) {
|
||||
unsigned w, d, h, m ,s ;
|
||||
|
||||
last = uptime ;
|
||||
d = h = m = 0 ;
|
||||
s = last % 60 ;
|
||||
w = last / 60 ;
|
||||
if( w) {
|
||||
m = w % 60 ;
|
||||
w /= 60 ;
|
||||
if( w) {
|
||||
h = w % 24 ;
|
||||
w /= 24 ;
|
||||
if( w) {
|
||||
d = w % 7 ;
|
||||
w /= 7 ;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
printf( "up") ;
|
||||
display( w, "week") ;
|
||||
display( d, "day") ;
|
||||
display( h, "hour") ;
|
||||
display( m, "minute") ;
|
||||
display( s, "second") ;
|
||||
printf( "\n") ;
|
||||
} else
|
||||
yield() ; /* Wait for System Tick Interrupt */
|
||||
}
|
||||
|
||||
/* end of uptime.c */
|
||||
Loading…
Reference in New Issue
Block a user