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Blink an LED on pi

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This commit is contained in:
Alexander Neuhäuser
2025-05-19 18:33:13 +02:00
parent d4063f025d
commit 948cbf758f
11 changed files with 44 additions and 62 deletions
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60
src/gpio.rs
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@@ -3,66 +3,28 @@ use crate::{
uart::{self},
};
const GPFSEL2: u32 = 0x3F20_0008; //GPIO 20-29
const GPFSEL4: u32 = 0x3F20_0010; //GPIO 40-49
const GPPUD: u32 = 0x3F20_0094;
const GPPUD_CLK: u32 = 0x3F20_0098; // GPIO 32-53
const GPSET0: u32 = 0x3F20_001C;
const GPCLR0: u32 = 0x3F20_0028;
unsafe fn set_gpio47_to_output() {
let value: u32 = 0b001 << 21;
unsafe fn set_gpio29_to_output() {
let value: u32 = 0b001 << 27;
core::ptr::write_volatile(GPFSEL4 as *mut u32, value);
core::ptr::write_volatile(GPFSEL2 as *mut u32, value);
}
unsafe fn enable_pull_up() {
let value: u32 = 0b10;
core::ptr::write_volatile(GPPUD as *mut u32, value);
}
unsafe fn enable_pull_down() {
let value: u32 = 0b01;
core::ptr::write_volatile(GPPUD as *mut u32, value);
}
unsafe fn disable_GPPUD() {
core::ptr::write_volatile(GPPUD as *mut u32, 0);
}
unsafe fn enable_clock_gpio47() {
let value: u32 = 0b1 << 13;
core::ptr::write_volatile(GPPUD as *mut u32, value);
}
unsafe fn disable_GPPUD_CLK() {
core::ptr::write_volatile(GPPUD as *mut u32, 0);
}
pub fn pull_up_gpio47() {
pub fn pull_up_gpio29() {
unsafe {
uart::print("Pull Up\n");
set_gpio47_to_output();
enable_pull_up();
// Wait 150 cycles
delay(150);
enable_clock_gpio47();
delay(150);
disable_GPPUD();
disable_GPPUD_CLK();
set_gpio29_to_output();
core::ptr::write_volatile(GPSET0 as *mut u32, 1 << 29);
}
}
pub fn pull_down_gpio47() {
pub fn pull_down_gpio29() {
unsafe {
uart::print("Pull Down\n");
set_gpio47_to_output();
enable_pull_down();
// Wait 150 cycles
delay(150);
enable_clock_gpio47();
delay(150);
disable_GPPUD();
disable_GPPUD_CLK();
core::ptr::write_volatile(GPCLR0 as *mut u32, 1 << 29);
}
}