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Porting C code to rust
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| #include <stdint.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <sys/fcntl.h> | |
| #include <sys/mman.h> | |
| #include <sys/stat.h> | |
| #define FATAL(msg) \ | |
| do { \ | |
| printf(msg); \ | |
| exit(1); \ | |
| } while (0) | |
| #define GPIO0_REGISTER 0x44E07000 | |
| #define GPIO1_REGISTER 0x4804C000 | |
| #define GPIO2_REGISTER 0x481AC000 | |
| #define GPIO_REGISTER_SIZE 0xFFF | |
| #define GPIO_OE_REGISTER 0x134 | |
| #define GPIO_DATAOUT_REGISTER 0x13C | |
| int main(void) | |
| { | |
| int fd = open("/dev/mem", O_RDWR); | |
| if (!fd) { | |
| FATAL("Cannot open memory device"); | |
| } | |
| volatile void* gpio1 = mmap(0, GPIO_REGISTER_SIZE, PROT_READ | PROT_WRITE, | |
| MAP_SHARED, fd, GPIO1_REGISTER); | |
| if (!gpio1) { | |
| FATAL("Cannot map GPIO memory"); | |
| } | |
| volatile uint32_t* gpio1_oe = gpio1 + GPIO_OE_REGISTER; | |
| volatile uint32_t* gpio1_dataout = gpio1 + GPIO_DATAOUT_REGISTER; | |
| *gpio1_oe = 0x00000000; | |
| while (1) { | |
| *gpio1_dataout = (1 << 12); // pin 12 | |
| *gpio1_dataout = 0; | |
| } | |
| return 0; | |
| } |
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| extern crate sysfs_gpio; | |
| use libc::c_int; | |
| use std::convert::TryInto; | |
| use std::ffi::CString; | |
| pub const GPIO_BASE_REGISTERS: (c_int, c_int, c_int) = (0x44E0_7000, 0x4804_C000, 0x481A_C000); | |
| pub const GPIO_REGISTER_SIZE: usize = 0xFFF; | |
| pub const GPIO_OE_REGISTER: isize = 0x134; | |
| pub const GPIO_DATAOUT_REGISTER: isize = 0x13C; | |
| pub const SDI_PIN: (u8, u8) = (1, 12); | |
| fn main() { | |
| let path = CString::new("/dev/mem").unwrap(); | |
| unsafe { | |
| let fd = libc::open(path.as_ptr(), libc::O_RDWR); | |
| if fd < 0 { | |
| panic!("Cannot open memory device"); | |
| } | |
| let gpio1: *mut u32 = libc::mmap( | |
| std::ptr::null_mut(), | |
| GPIO_REGISTER_SIZE, | |
| libc::PROT_READ | libc::PROT_WRITE, | |
| libc::MAP_SHARED, | |
| fd, | |
| GPIO_BASE_REGISTERS.1.try_into().unwrap(), | |
| ) as *mut u32; | |
| if gpio1.is_null() { | |
| panic!("Cannot map GPIO memory"); | |
| } | |
| let gpio1_oe: *mut u32 = gpio1.offset(GPIO_OE_REGISTER); | |
| let gpio1_dataout: *mut u32 = gpio1.offset(GPIO_DATAOUT_REGISTER); | |
| std::ptr::write_volatile(gpio1_oe, 0); | |
| loop { | |
| std::ptr::write_volatile(gpio1_dataout, 1 << 12); | |
| std::ptr::write_volatile(gpio1_dataout, 0); | |
| } | |
| } | |
| } |
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