Interface changes and added example

embassy-rp/src/psram.rs

@@ -11,10 +11,9 @@
 #![cfg(feature = "_rp235x")]
 
 use critical_section::{acquire, release, CriticalSection, RestoreState};
-use embassy_hal_internal::Peri;
 
 use crate::qmi_cs1::QmiCs1;
-use crate::{pac, peripherals};
+use crate::pac;
 
 /// PSRAM errors.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -215,11 +214,9 @@ impl<'d> Psram<'d> {
     ///
     /// This will detect the PSRAM device and configure it for memory-mapped access.
     pub fn new(
-        qmi_cs1_peripheral: Peri<'d, peripherals::QMI_CS1>,
+        qmi_cs1: QmiCs1<'d>,
-        cs1: Peri<'d, impl crate::qmi_cs1::QmiCs1Pin>,
         config: Config,
     ) -> Result<Self, Error> {
-        let qmi_cs1 = QmiCs1::new(qmi_cs1_peripheral, cs1);
         let qmi = pac::QMI;
         let xip = pac::XIP_CTRL;
 

examples/rp235x/src/bin/psram.rs

@@ -0,0 +1,49 @@
+//! This example tests an APS6404L PSRAM chip connected to the RP235x
+//! It fills the PSRAM with alternating patterns and reads back a value
+//!
+//! In this example, the PSRAM CS is connected to Pin 0.
+
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+use core::slice;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let config = embassy_rp::config::Config::default();
+    let p = embassy_rp::init(config);
+    let psram_config = embassy_rp::psram::Config::aps6404l();
+    let psram = embassy_rp::psram::Psram::new(embassy_rp::qmi_cs1::QmiCs1::new(p.QMI_CS1, p.PIN_0), psram_config);
+
+    let Ok(psram) = psram else {
+        error!("PSRAM not found");
+        loop {
+            Timer::after_secs(1).await;
+        };
+    };
+
+    let psram_slice = unsafe {
+        let psram_ptr = psram.base_address();
+        let slice: &'static mut [u8] =
+            slice::from_raw_parts_mut(psram_ptr, psram.size() as usize);
+        slice
+    };
+
+    loop {
+        psram_slice.fill(0x55);
+        info!("PSRAM filled with 0x55");
+        let at_addr = psram_slice[0x100];
+        info!("Read from PSRAM at address 0x100: 0x{:02x}", at_addr);
+        Timer::after_secs(1).await;
+
+        psram_slice.fill(0xAA);
+        info!("PSRAM filled with 0xAA");
+        let at_addr = psram_slice[0x100];
+        info!("Read from PSRAM at address 0x100: 0x{:02x}", at_addr);
+        Timer::after_secs(1).await;
+    }
+}