Start adding support for Apollo3 devices

Signed-off-by: Carey Sonsino <[email protected]>
adafruit · Sep 16, 2019 · aeafa85 · aeafa85
1 parent 48da9b3
commit aeafa85
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Showing 3 changed files with 157 additions and 1 deletion.
diff --git a/Adafruit_NeoPixel.cpp b/Adafruit_NeoPixel.cpp
@@ -1700,6 +1700,10 @@ void Adafruit_NeoPixel::show(void) {
   }
 #endif
 
+#elif defined (AM_PART_APOLLO3) // Apollo3
+
+  apollo3Show(pin, pixels, numBytes, is800KHz);
+
 #elif defined (__SAMD51__) // M4
 
   uint8_t  *ptr, *end, p, bitMask, portNum, bit;
@@ -2210,7 +2214,18 @@ void Adafruit_NeoPixel::show(void) {
   @param   p  Arduino pin number (-1 = no pin).
 */
 void Adafruit_NeoPixel::setPin(uint16_t p) {
-  if(begun && (pin >= 0)) pinMode(pin, INPUT);
+  if(begun && (pin >= 0)) {
+#if defined(AM_PART_APOLLO3)
+    // The pin has already been mapped to the Apollo3 pad
+    apollo3UnsetPin(pin);
+#endif
+    pinMode(pin, INPUT);
+  }
+#if defined(AM_PART_APOLLO3)
+    // Map the specified pin to the Apollo3 pad
+    p = ap3_gpio_pin2pad(p);
+    apollo3SetPin(p);
+#endif
   pin = p;
   if(begun) {
     pinMode(p, OUTPUT);

diff --git a/Adafruit_NeoPixel.h b/Adafruit_NeoPixel.h
@@ -334,6 +334,12 @@ class Adafruit_NeoPixel {
 
  protected:
 
+#if defined (AM_PART_APOLLO3)
+  void apollo3UnsetPin(uint16_t pin);
+  void apollo3SetPin(uint16_t pin);
+  void apollo3Show(uint16_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz);
+#endif // AM_PART_APOLLO3
+
 #ifdef NEO_KHZ400  // If 400 KHz NeoPixel support enabled...
   boolean           is800KHz;   ///< true if 800 KHz pixels
 #endif

diff --git a/apollo3.cpp b/apollo3.cpp
@@ -0,0 +1,135 @@
+// This provides the functionality for Apollo3 devices.
+
+#if defined(AM_PART_APOLLO3)
+
+#include <ap3_types.h>
+#include <am_hal_gpio.h>
+
+#include "Adafruit_NeoPixel.h"
+
+// The timing method used to control the NeoPixels
+// TODO: Implement something better (interrupts, DMA, etc)
+#define PIN_METHOD_FAST_GPIO
+
+/*!
+  @brief   Unset the NeoPixel output pin number.
+  @param   p  Arduino pin number (-1 = no pin).
+*/
+void Adafruit_NeoPixel::apollo3UnsetPin(uint16_t pin) {
+#if defined(PIN_METHOD_FAST_GPIO)
+  // Unconfigure the pin for Fast GPIO.
+  am_hal_gpio_fastgpio_disable(pin);
+#endif
+}
+
+/*!
+  @brief   Set the NeoPixel output pin number.
+  @param   p  Arduino pin number (-1 = no pin).
+*/
+void Adafruit_NeoPixel::apollo3SetPin(uint16_t pin) {
+#if defined(PIN_METHOD_FAST_GPIO)
+  // Configure the pin to be used for Fast GPIO.
+  am_hal_gpio_fastgpio_disable(pin);
+  am_hal_gpio_fastgpio_clr(pin);
+
+  am_hal_gpio_fast_pinconfig((uint64_t)0x1 << pin,
+                             g_AM_HAL_GPIO_OUTPUT, 0);
+  // uint32_t ui32Ret = am_hal_gpio_fast_pinconfig((uint64_t)0x1 << pin,
+  //                                               g_AM_HAL_GPIO_OUTPUT, 0);
+  // if (ui32Ret) {
+  //   am_util_stdio_printf(
+  //     "Error returned from am_hal_gpio_fast_pinconfig() = .\n", ui32Ret);
+  // }
+#endif
+}
+
+// Note - The timings used below are based on the Arduino Zero,
+//   Gemma/Trinket M0 code.
+
+/*!
+  @brief   Transmit pixel data in RAM to NeoPixels.
+  @note    The current design is a quick hack and should be replaced with
+           a more robust timing mechanism.
+*/
+void Adafruit_NeoPixel::apollo3Show(
+  uint16_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
+
+  uint8_t  *ptr, *end, p, bitMask;
+  ptr     =  pixels;
+  end     =  ptr + numBytes;
+  p       = *ptr++;
+  bitMask =  0x80;
+
+#if defined(PIN_METHOD_FAST_GPIO)
+
+  // disable interrupts
+  am_hal_interrupt_master_disable();
+
+#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
+  if(is800KHz) {
+#endif
+    for(;;) {
+      am_hal_gpio_fastgpio_set(pin);
+      //asm("nop; nop; nop; nop; nop; nop; nop; nop;");
+      asm("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");
+      if(p & bitMask) {
+        asm("nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop;");
+        am_hal_gpio_fastgpio_clr(pin);
+      } else {
+        am_hal_gpio_fastgpio_clr(pin);
+        asm("nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop;");
+      }
+      if(bitMask >>= 1) {
+	asm("nop; nop; nop; nop; nop; nop; nop; nop; nop;");
+      } else {
+        if(ptr >= end) break;
+        p       = *ptr++;
+        bitMask = 0x80;
+      }
+    }
+#ifdef NEO_KHZ400
+  } else { // 400 KHz bitstream
+    // NOTE - These timings may need to be tweaked
+    for(;;) {
+      am_hal_gpio_fastgpio_set(pin);
+      //asm("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");
+      asm("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");
+      if(p & bitMask) {
+        asm("nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop;");
+        am_hal_gpio_fastgpio_clr(pin);
+      } else {
+        am_hal_gpio_fastgpio_clr(pin);
+        asm("nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop; nop; nop; nop; nop; nop;"
+            "nop; nop; nop;");
+      }
+      asm("nop; nop; nop; nop; nop; nop; nop; nop;"
+          "nop; nop; nop; nop; nop; nop; nop; nop;"
+          "nop; nop; nop; nop; nop; nop; nop; nop;"
+          "nop; nop; nop; nop; nop; nop; nop; nop;");
+      if(bitMask >>= 1) {
+        asm("nop; nop; nop; nop; nop; nop; nop;");
+      } else {
+        if(ptr >= end) break;
+        p       = *ptr++;
+        bitMask = 0x80;
+      }
+    }
+  }
+
+  // re-enable interrupts
+  am_hal_interrupt_master_enable();
+
+#endif // NEO_KHZ400
+#endif // PIN_METHOD_FAST_GPIO
+}
+
+#endif // AM_PART_APOLLO3