Improve writing.minimalist

1 files changed, 14 insertions, 26 deletions

diff --git a/_log/e-reader.md b/_log/e-reader.md
index bc979ea..583788d 100644
--- a/_log/e-reader.md
+++ b/_log/e-reader.md
@@ -6,20 +6,20 @@ project: true
 thumbnail: thumb_sm.png
 ---
 
-Built an e-reader using an ESP-WROOM-32, a 7.5" Waveshare e-paper display, and
-a three-button interface (prev/next/sleep).
+Stitched together an e-reader using an ESP-WROOM-32, a 7.5" Waveshare e-paper
+display, and a three-button interface (prev/next/sleep).
 
 <video style="max-width:100%;" controls="" poster="poster.png">
   <source src="ereader.mp4" type="video/mp4">
 </video>
 
-ESP-32-WROOM has 512 KB SRAM and 4 MB flash. Internal flash is unsuitable for
-storing books due to P/E cycle limit. Used HTTP Range requests to stream them
-on-demand. Saved reading progress to RTC memory to survive deep sleep without
+ESP-WROOM-32 has 512 KB SRAM and 4 MB flash. Internal flash is unsuitable for
+storing books due to P/E cycle limit. Streamed pages via HTTP on-demand
+instead. Reading progress is saved in RTC memory to survive deep sleep without
 flash wear.
 
 Rasterized PDFs into sequences of bitmaps. 1 byte = 8 pixels, 1 page = 48 KB
-(display resolution), headerless. Optimized for Range requests without
+(the display resolution), headerless; optimized for HTTP Range requests without
 server-side logic:
 
 ```
@@ -34,30 +34,18 @@ esp_http_client_set_header(http_client, "Range", buf);
 esp_http_client_perform(http_client);
 ```
 
-Implemented a three-page circular buffer (prev/current/next)—maximum possible
-with 512 KB. GPIO interrupts triggered by button presses cycle the buffer,
-update the screen, and prefetch the next page.
+A circular buffer stores three pages—maximum possible with the 512 KB.
+Button-triggered GPIO interrupts cycle the buffer, update the screen, and
+prefetch the next page.
 
-```
-c_page_num++;
-pg.page_num = c_page_num + 2;
-pg.page_buf = pages[(c_page_num + 1) % PAGE_LEN];
-
-xSemaphoreGive(mutex);
-xQueueSend(http_evt_queue, &pg, portMAX_DELAY);
-
-epd_draw_async(pages[c_page_num % PAGE_LEN], PAGE_SIZE);
-epd_draw_await();
-```
+Reader isn't as responsive as I'd hoped. Scheduling GPIO, SPI, and HTTP tasks
+on a single core causes input lag. 
 
-System isn't as responsive as I'd hoped. Scheduling GPIO, SPI, and HTTP tasks
-on a single core causes input lag. Pinned the GPIO/SPI tasks to one core and
-the HTTP task to the other.
+Pinned the GPIO and SPI tasks to one core and the HTTP task to the other.
 
-Better, but screen updates block user input; page turning feels sluggish. 
+Better, but screen updates block user input. Page turning feels sluggish. 
 
-Moved the SPI buffers to DMA and made the transfers async, hoping to shave off
-a few more cycles.
+Moved SPI buffers to DMA and made transfers async, hoping to offload the CPU.
 
 Can't think of anything else. Led to [Etlas](../etlas/).