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Basic documentation

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This commit is contained in:
Alexander Neuhäuser
2025-06-08 15:49:58 +02:00
parent c78d834742
commit 5f85a40f13
3 changed files with 47 additions and 17 deletions
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44
src/peripherals/gpio.rs
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@@ -1,6 +1,5 @@
use core::ptr::{read_volatile, write_volatile};
use core::result::Result;
use core::result::Result::Err;
use core::result::Result::Ok;
use crate::timer::delay_nops;
@@ -15,7 +14,7 @@ const GPREN_BASE: u32 = 0x3F20_004C;
const GPFEN_BASE: u32 = 0x3F20_0058;
#[repr(u32)]
pub enum GPIOState {
pub enum GPIOFunction {
Input = 0b000,
Output = 0b001,
Alternative0 = 0b100,
@@ -26,11 +25,8 @@ pub enum GPIOState {
Alternative5 = 0b010,
}
pub fn set_gpio_state(gpio: u8, state: GPIOState) -> Result<(), &'static str> {
if gpio > 53 {
return Err("GPIO out of range");
}
/// Set the function of the GPIO pin
pub fn set_gpio_function(gpio: u8, state: GPIOFunction) -> Result<(), &'static str> {
let register_index = gpio / 10;
let register_offset = (gpio % 10) * 3;
let register_addr = GPFSEL_BASE + (register_index as u32 * 4);
@@ -47,6 +43,9 @@ pub fn set_gpio_state(gpio: u8, state: GPIOState) -> Result<(), &'static str> {
Ok(())
}
/// Set the GPIO to high
///
/// Should be used when GPIO function is set to `OUTPUT` via `set_gpio_function`
pub fn gpio_high(gpio: u8) -> Result<(), &'static str> {
unsafe {
let register_index = gpio / 32;
@@ -58,6 +57,9 @@ pub fn gpio_high(gpio: u8) -> Result<(), &'static str> {
Ok(())
}
/// Set the GPIO to low
///
/// Should be used when GPIO function is set to `OUTPUT` via `set_gpio_function`
pub fn gpio_low(gpio: u8) -> Result<(), &'static str> {
unsafe {
let register_index = gpio / 32;
@@ -69,6 +71,7 @@ pub fn gpio_low(gpio: u8) -> Result<(), &'static str> {
Ok(())
}
/// Read the current GPIO power state
pub fn gpio_get_state(gpio: u8) -> u8 {
unsafe {
let register_index = gpio / 32;
@@ -80,10 +83,16 @@ pub fn gpio_get_state(gpio: u8) -> u8 {
}
}
/// Pull GPIO up
///
/// Should be used when GPIO function is set to `INPUT` via `set_gpio_function`
pub fn gpio_pull_up(gpio: u8) {
gpio_pull_up_down(gpio, 0b10);
}
/// Pull GPIO down
///
/// Should be used when GPIO function is set to `INPUT` via `set_gpio_function`
pub fn gpio_pull_down(gpio: u8) {
gpio_pull_up_down(gpio, 0b01);
}
@@ -115,20 +124,31 @@ fn gpio_pull_up_down(gpio: u8, val: u32) {
}
}
pub fn read_falling_edge_detect(gpio: u8) -> u32 {
/// Get the current status if falling edge detection is set
pub fn read_falling_edge_detect(gpio: u8) -> bool {
unsafe {
// Determine GPLEN Register
let register_addr = GPFEN_BASE + 4 * (gpio as u32 / 32);
let register_offset = gpio % 32;
let current = read_volatile(register_addr as *const u32);
return (current >> register_offset) & 0b1;
((current >> register_offset) & 0b1) != 0
}
}
/// Get the current status if falling edge detection is set
pub fn read_rising_edge_detect(gpio: u8) -> bool {
unsafe {
let register_addr = GPREN_BASE + 4 * (gpio as u32 / 32);
let register_offset = gpio % 32;
let current = read_volatile(register_addr as *const u32);
((current >> register_offset) & 0b1) != 0
}
}
/// Enables falling edge detection
pub fn set_falling_edge_detect(gpio: u8, enable: bool) {
unsafe {
// Determine GPLEN Register
let register_addr = GPFEN_BASE + 4 * (gpio as u32 / 32);
let register_offset = gpio % 32;
@@ -144,9 +164,9 @@ pub fn set_falling_edge_detect(gpio: u8, enable: bool) {
}
}
/// Enables rising edge detection
pub fn set_rising_edge_detect(gpio: u8, enable: bool) {
unsafe {
// Determine GPHEN Register
let register_addr = GPREN_BASE + 4 * (gpio as u32 / 32);
let register_offset = gpio % 32;