hi everyone i need some code to control 6 relays via the gpio pins
ill give you the c code i have but i want it in python pls can you help me
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#define IOBASE 0x20000000
#define GPIO_BASE (IOBASE + 0x200000)
#define GPFSEL0 *(gpio.addr + 0)
#define GPFSEL1 *(gpio.addr + 1)
#define GPFSEL2 *(gpio.addr + 2)
#define GPFSEL3 *(gpio.addr + 3)
#define GPFSEL4 *(gpio.addr + 4)
#define GPFSEL5 *(gpio.addr + 5)
// Reserved @ word offset 6
#define GPSET0 *(gpio.addr + 7)
#define GPSET1 *(gpio.addr + 8)
// Reserved @ word offset 9
#define GPCLR0 *(gpio.addr + 10)
#define GPCLR1 *(gpio.addr + 11)
// Reserved @ word offset 12
#define GPLEV0 *(gpio.addr + 13)
#define GPLEV1 *(gpio.addr + 14)
#define BIT_17 (1 << 17)
#define PAGESIZE 4096
#define BLOCK_SIZE 4096
struct bcm2835_peripheral {
unsigned long addr_p;
int mem_fd;
void *map;
volatile unsigned int *addr;
};
struct bcm2835_peripheral gpio = {GPIO_BASE};
// Some forward declarations...
int map_peripheral(struct bcm2835_peripheral *p);
void unmap_peripheral(struct bcm2835_peripheral *p);
int gpio_state = -1;
////////////////
// main()
////////////////
int main(int argc, char *argv[]) {
if(argc == 2) {
if(!strcmp(argv[1], "on"))
gpio_state = 1;
if(!strcmp(argv[1], "off"))
gpio_state = 0;
}
if(map_peripheral(&gpio) == -1) {
printf("Failed to map the physical GPIO registers into the virtual memory space.\n");
return -1;
}
/* Set GPIO 17 as an output pin */
GPFSEL1 &= ~(7 << 21); // Mask out bits 23-21 of GPFSEL1 (i.e. force to zero)
GPFSEL1 |= (1 << 21); // Set bits 23-21 of GPFSEL1 to binary '001'
if(gpio_state == 0)
GPCLR0 = BIT_17;
else if(gpio_state == 1)
GPSET0 = BIT_17;
usleep(1); // Delay to allow any change in state to be reflected in the LEVn, register bit.
printf("GPIO 17 is %s\n", (GPLEV0 & BIT_17) ? "high" : "low");
unmap_peripheral(&gpio);
// Done!
}
// Exposes the physical address defined in the passed structure using mmap on /dev/mem
int map_peripheral(struct bcm2835_peripheral *p)
{
// Open /dev/mem
if ((p->mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
printf("Failed to open /dev/mem, try checking permissions.\n");
return -1;
}
p->map = mmap(
NULL,
BLOCK_SIZE,
PROT_READ|PROT_WRITE,
MAP_SHARED,
p->mem_fd, // File descriptor to physical memory virtual file '/dev/mem'
p->addr_p // Address in physical map that we want this memory block to expose
);
if (p->map == MAP_FAILED) {
perror("mmap");
return -1;
}
p->addr = (volatile unsigned int *)p->map;
return 0;
}
void unmap_peripheral(struct bcm2835_peripheral *p) {
munmap(p->map, BLOCK_SIZE);
close(p->mem_fd);
}
