garbaj earle code

rp2040_uart/2024-03_rp2040-uart.md

@@ -60,3 +60,21 @@ Not totally sure, but I'm going to move on to try out Earle's software serial PI
 [the earle pio softwareserial.cpp](https://github.com/earlephilhower/arduino-pico/blob/4c1c72c996b6a1243b0eafa956dd0eb6410e2362/cores/rp2040/SerialPIO.cpp)  
 
 So - let's try this out. 
+
+OK, my big dawg `earle` looks to have this locked down, it is werken. It's also wrapped in the arduino Serial API meaning I could use 'em in an abstracted class for P2P comms. Bless his heart, now I need to check i.e. continuity and make some measurements... 
+
+Ah, jesus, nevermind, it is catching garbage bytes... all 255's, and it's reporting new-byteness when in fact none are visible on the line. 
+
+---
+
+### Not in Flash
+
+I'm also noticing [this pattern](https://github.com/earlephilhower/arduino-pico/blob/4c1c72c996b6a1243b0eafa956dd0eb6410e2362/cores/rp2040/SerialPIO.cpp#L90) to do:
+
+```cpp
+void __not_in_flash_func(){}
+```
+
+Around some handlers. I wonder if this is a missing step on lots of these codes... This is discussed [in this forum post](https://forums.raspberrypi.com/viewtopic.php?t=311811) and also shows up in [the sdk here](https://github.com/raspberrypi/pico-sdk/blob/master/src/rp2_common/hardware_spi/spi.c#L84) - for fast shit. Maybe important...
+
+Also points to a larger red flag for me about the system... maybe this is not actually the microcontroller for hardo realtime stuff... 
\ No newline at end of file

rp2040_uart/code/uart_pio_earle_rx/screen.cpp

+#include "screen.h"
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#include <Wire.h>
+
+// OLED 
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+
+#define X_POS 0
+#define Y_POS 0
+#define TXT_SIZE 1
+
+// even for displays with i.e. "0x78" printed on the back, 
+// the address that works is 0x3C, IDK 
+#define SCREEN_ADDRESS 0x3C
+
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT);
+
+// warning: is blocking, takes ~ 33ms ! 
+void displayPrint(String msg){
+  display.clearDisplay();
+  display.setCursor(X_POS, Y_POS);
+  display.print(msg);
+  display.display();
+}
+
+void displaySetup(void){
+  // initialize the screen,
+  // oddly, SWITCHCAPVCC is the option that works even though OLED is hooked to 5V 
+  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
+  display.clearDisplay();
+  display.display();
+  display.setTextColor(SSD1306_WHITE);
+  display.setTextSize(TXT_SIZE);
+  display.setTextWrap(true);
+  display.dim(false);
+  displayPrint("bonjour...");
+}
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rp2040_uart/code/uart_pio_earle_rx/screen.h

+#ifndef SCREEN_H_
+#define SCREEN_H_
+
+#include <Arduino.h>
+
+void displaySetup(void);
+void displayPrint(String msg);
+
+#endif 
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rp2040_uart/code/uart_pio_earle_rx/uart_pio_earle_rx.ino

+#include "screen.h"
+
+// using an RP2040 XIAO 
+// with earle philhower core 
+
+// "D10" - GPIO 3 
+#define PIN_DEBUG 3 
+
+// on XIAO "RX" - GPIO 1
+#define PIN_RX 1
+#define PIO_BAUD 1000000
+
+SerialPIO serial(SerialPIO::NOPIN, PIN_RX);
+
+void setup(void){
+  pinMode(PIN_LED_B, OUTPUT);
+  digitalWrite(PIN_LED_B, LOW);
+
+  pinMode(PIN_DEBUG, OUTPUT);
+  digitalWrite(PIN_DEBUG, LOW);
+
+  // the display setup 
+  displaySetup();
+  displayPrint("bonjour...");
+
+  serial.begin(PIO_BAUD);
+}
+
+uint32_t lastUpdate = 0;
+uint32_t updateInterval = 200;
+
+uint8_t expectedRx = 0;
+uint32_t missCount = 0;
+uint32_t catchCount = 0;
+
+uint8_t chars[256];
+
+void loop(void){
+  if(serial.available()){
+    // earle core throws -1 if we have an error, 
+    int data = serial.read();
+    if(data < 0) {
+      return;
+    }
+    // count total hits 
+    catchCount ++;
+    // catch data and count sequence errors 
+    digitalWrite(PIN_DEBUG, !digitalRead(PIN_DEBUG));
+    chars[catchCount & 255] = data;
+    if(data != expectedRx){
+      missCount ++;
+    }
+    expectedRx = data + 1;
+  }
+  // uint8_t data = uart_rx_program_getc(pio, sm);
+  // digitalWrite(PIN_DEBUG, LOW);
+  // ... 
+  if(lastUpdate + updateInterval < millis()){
+    lastUpdate = millis();
+    digitalWrite(PIN_LED_B, !digitalRead(PIN_LED_B));
+    displayPrint(String(missCount) + " / " + String(catchCount) + " \n" + 
+    String(chars[0]) + ", " + String(chars[1]) + ", " + String(chars[2]) + ", " + String(chars[3]) + ", " + String(chars[4]) + ", " + String(chars[5]) + ", "
+    );
+
+    // displayPrint(spipi_print());
+    // displayPrint(String(rxCount) + "\n" + 
+    //   String(rxSize) 
+    // );
+  }
+}
+

rp2040_uart/code/uart_pio_tx/uart_pio_tx.ino

@@ -9,7 +9,7 @@
 
 // on XIAO "TX" - GPIO 0 
 #define PIN_TX 0
-#define PIO_BAUD 115200
+#define PIO_BAUD 1000000
 
 // the PIO, and statemachine ? 
 PIO pio = pio0;
@@ -34,10 +34,12 @@ void setup(void){
 uint32_t lastUpdate = 0;
 uint32_t updateInterval = 200;
 
+uint8_t seqNum = 0;
+
 void loop(void){
   digitalWrite(PIN_DEBUG, HIGH);
   // blocking tx-put: 
-  uart_tx_program_putc(pio, sm, 85);
+  uart_tx_program_putc(pio, sm, seqNum ++);
   delayMicroseconds(200);
   digitalWrite(PIN_DEBUG, LOW);
   // ...