From da405029113f9c188313b9477f4dc13aa3ab52f9 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Thu, 15 Aug 2019 20:44:51 -0400
Subject: More WIP for btle comms.

---
 ble/src/uarte1.rs | 52 ++++++++++++++++++----------------------------------
 1 file changed, 18 insertions(+), 34 deletions(-)

(limited to 'ble/src/uarte1.rs')

diff --git a/ble/src/uarte1.rs b/ble/src/uarte1.rs
index 1afce29..0beb8cd 100644
--- a/ble/src/uarte1.rs
+++ b/ble/src/uarte1.rs
@@ -2,9 +2,9 @@ use log::info;
 use nrf52840_hal::uarte::{self, Uarte};
 use starb::{Reader, RingBuffer, Writer};
 
-static mut RB: RingBuffer<u8> = RingBuffer::new(0);
+static mut RB: RingBuffer<u8> = RingBuffer::new();
 
-const BUFLEN: usize = 128;
+const BUFLEN: usize = 255;
 
 struct DoubleBuffer {
     bank0: [u8; BUFLEN],
@@ -51,6 +51,9 @@ where
         w.rxstarted().set_bit()
     });
 
+    // Keep the transmission going constantly.
+    uarte.0.shorts.write(|w| w.endrx_startrx().set_bit());
+
     let ptr = unsafe { DBL_BUFF.next_ptr() };
     info!("setting up dma: p: {:x}, maxcnt: {}", ptr as u32, BUFLEN);
     uarte.0.rxd.ptr.write(|w| unsafe { w.ptr().bits(ptr as _) });
@@ -75,48 +78,29 @@ where
     if uarte.0.events_endrx.read().events_endrx().bit_is_set() {
         uarte.0.events_endrx.write(|w| w.events_endrx().clear_bit());
 
-        // The buffer should be swapped from the RXSTARTED event, so
-        // we can restart the read immediately.
-        let optr = uarte.0.rxd.ptr.read().ptr().bits();
-        let ptr = unsafe { DBL_BUFF.cur_ptr() as u32 };
-        /*
-        if optr == ptr {
-            uarte
-                .0
-                .rxd
-                .ptr
-                .write(|w| unsafe { w.ptr().bits(DBL_BUFF.next_ptr() as _) });
-        }
-         */
-        uarte.0.tasks_startrx.write(|w| w.tasks_startrx().set_bit());
-
         // Copy DMA buffer to ring buffer.
         let len = uarte.0.rxd.amount.read().amount().bits();
+        let ptr = unsafe { DBL_BUFF.cur_ptr() };
+        /*
+        let optr = uarte.0.rxd.ptr.read().ptr().bits();
         let mc = uarte.0.rxd.maxcnt.read().maxcnt().bits();
         info!(
-            "endrx - l: {}, p: {:x}, mc: {}, b: {:x}",
-            len, optr, mc, ptr
+            "ENDRX optr: {:x}, mc: {}, ptr: {:x}, len: {}",
+            optr, mc, ptr as u32, len,
         );
-        flush_buf(writer, unsafe { DBL_BUFF.cur_ptr() }, len.into());
-
-    /*
-    uarte
-        .0
-        .rxd
-        .maxcnt
-        .write(|w| unsafe { w.maxcnt().bits(BUFLEN as _) });
-     */
+         */
+        flush_buf(writer, ptr, len as usize);
     } else if uarte.0.events_error.read().events_error().bit_is_set() {
         uarte.0.events_error.write(|w| w.events_error().clear_bit());
 
         let len = uarte.0.rxd.amount.read().amount().bits();
-        info!("error: {:b} {}b", uarte.0.errorsrc.read().bits(), len,);
+        info!("ERROR {:b} {}b", uarte.0.errorsrc.read().bits(), len);
     } else if uarte.0.events_rxto.read().events_rxto().bit_is_set() {
         uarte.0.events_rxto.write(|w| w.events_rxto().clear_bit());
 
         let len = uarte.0.rxd.amount.read().amount().bits();
-        info!("rxto - {}", len);
-        flush_buf(writer, unsafe { DBL_BUFF.cur_ptr() }, len.into());
+        info!("RXTO - {}", len);
+        flush_buf(writer, unsafe { DBL_BUFF.cur_ptr() }, len as usize);
         uarte.0.tasks_flushrx.write(|w| w.tasks_flushrx().set_bit());
     } else if uarte
         .0
@@ -129,7 +113,7 @@ where
             .0
             .events_rxstarted
             .write(|w| w.events_rxstarted().clear_bit());
-        info!("rxstarted");
+        //info!("RXSTARTED");
 
         // Swap to the next buffer as soon as the transfer starts to
         // try and lose as little data as possible.
@@ -140,7 +124,7 @@ where
 
 fn flush_buf(writer: &mut Writer<u8>, ptr: *mut u8, len: usize) {
     let buf = unsafe { core::slice::from_raw_parts(ptr, len) };
-    info!("flush start");
+    //info!("flush start");
     writer.unshift_from(buf);
-    info!("flush end");
+    //info!("flush end");
 }
-- 
cgit v1.2.3