Merge pull request #4496 from variegated-coffee/psram

feat(embassy-rp): RP2350 - Add support for QMI CS1, and for APS6404L PSRAM

1 files changed, 49 insertions, 0 deletions

diff --git a/examples/rp235x/src/bin/psram.rs b/examples/rp235x/src/bin/psram.rs
new file mode 100644
index 000000000..716ac7695
--- /dev/null
+++ b/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 core::slice;
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[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;
+    }
+}