Use analogWrite together with a polyfill lib

Author: bor0

README.md

@@ -28,6 +28,10 @@ In order to reload a program, use the `0000` instruction to halt the VM and rest
 
 Tested on ESP32 Arduino (WROOM32).
 
+Prerequisites:
+
+- Install analogWrite polyfill
+
 References:
 
 - http://en.wikipedia.org/wiki/CHIP-8

bin/example.bin

@@ -1,10 +1,12 @@
+#include <analogWrite.h>
+
 void setup() {
   pinMode(LED_BUILTIN, OUTPUT);
 }
 
 void loop() {
-  digitalWrite(LED_BUILTIN, HIGH);
+  analogWrite(LED_BUILTIN, 255);
   delay(1000);
-  digitalWrite(LED_BUILTIN, LOW);
+  analogWrite(LED_BUILTIN, 0);
   delay(1000);
 }

bin/example.c

@@ -1,8 +1,8 @@
 6002 ; V[0] = 2 (LED_BUILTIN for ESP WROOM32)
 E2A1 ; pinMode(V[0], 2); (OUTPUT for ESP WROOM32)
 
-6101 ; V[1] = 1
-E0A3 ; digitalWrite(5, 1);
+61FF ; V[1] = 255
+E0A3 ; analogWrite(2, 255);
 
 62FA ; V[2] = 250
 72FA ; V[2] += 250
@@ -11,7 +11,7 @@ E0A3 ; digitalWrite(5, 1);
 E0A0 ; delay(1000);
 
 6100 ; V[1] = 0
-E0A3 ; digitalWrite(5, 0);
+E0A3 ; analogWrite(2, 0);
 
 E0A0 ; delay(1000);
 

bin/example.hex

@@ -16,6 +16,7 @@ along with evm-esp32. If not, see <http://www.gnu.org/licenses/>.
 
 */
 #include "include/opcodes.h"
+#include <analogWrite.h>
 
 void parse_opcode(struct vm *VM, uint16_t opcode)
 {
@@ -44,7 +45,7 @@ void parse_opcode(struct vm *VM, uint16_t opcode)
         break;
     case 0xE0A3:
         /* Write to pin (first register) a value (second register) */
-        digitalWrite(VM->registers.v[0], VM->registers.v[1]);
+        analogWrite(VM->registers.v[0], VM->registers.v[1]);
         return;
         break;
     default: