at91sysclock.c
55 lines
| 1.2 KiB
| text/x-c
|
CLexer
| r116 | /* | |||
| * This programmer uses AT91' System clock | ||||
| * | ||||
| * 2010 by Ricardo V. Rojas Quispe | ||||
| */ | ||||
| #include <stdint.h> | ||||
| #include <stdlib.h> | ||||
| #include <stdio.h> | ||||
| #include <unistd.h> | ||||
| #include <sys/types.h> | ||||
| #include <sys/stat.h> | ||||
| #include <sys/mman.h> | ||||
| #include <fcntl.h> | ||||
| #include "./Librerias/at91sysclock.h" | ||||
| //Mapeando los registro en memoria: | ||||
| AT91S_PMC *clock_map(unsigned int clockbase){ | ||||
| int fd; | ||||
| void *base; | ||||
| AT91S_PMC *clock; | ||||
| off_t addr = clockbase; | ||||
| if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) { | ||||
| fprintf(stderr, "Cannot open /dev/mem.\n"); | ||||
| exit(EXIT_FAILURE); | ||||
| } | ||||
| //fprintf(stderr, "/dev/mem opened.\n"); | ||||
| base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr & ~MAP_MASK); | ||||
| if (base == (void *) -1) { | ||||
| fprintf(stderr, "Cannot open /dev/mem.\n"); | ||||
| exit(EXIT_FAILURE); | ||||
| } | ||||
| //fprintf(stderr, "Memory mapped at address %p.\n", base); | ||||
| clock = base + (addr & MAP_MASK); | ||||
| return clock; | ||||
| } | ||||
| //Habilitamos el clock de ADC | ||||
| void enable_clock_adc(AT91S_PMC * clock){ | ||||
| clock->PMC_PCER=0x20; | ||||
| } | ||||
| //Leemos el registro de estado de clock para perifericos | ||||
| unsigned int status_clock_adc(AT91S_PMC * clock){ | ||||
| return (clock->PMC_PCSR); | ||||
| } | ||||
