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Initial Apollo3 Implementation #205

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Initial Apollo3 Implementation #205

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17 changes: 16 additions & 1 deletion Adafruit_NeoPixel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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 been mapped to the Apollo3 pad
apollo3UnsetPad(pin);
#endif
pinMode(pin, INPUT);
}
#if defined(AM_PART_APOLLO3)
// Map the specified pin to the Apollo3 pad
p = ap3_gpio_pin2pad(p);
apollo3SetPad(p);
#endif
pin = p;
if(begun) {
pinMode(p, OUTPUT);
Expand Down
6 changes: 6 additions & 0 deletions Adafruit_NeoPixel.h
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Original file line number Diff line number Diff line change
Expand Up @@ -334,6 +334,12 @@ class Adafruit_NeoPixel {

protected:

#if defined (AM_PART_APOLLO3)
void apollo3UnsetPad(ap3_gpio_pad_t pad);
void apollo3SetPad(ap3_gpio_pad_t pad);
void apollo3Show(ap3_gpio_pad_t pad, 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
Expand Down
135 changes: 135 additions & 0 deletions apollo3.cpp
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Original file line number Diff line number Diff line change
@@ -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 pad number.
@param pad Apollo3 pad number
*/
void Adafruit_NeoPixel::apollo3UnsetPad(ap3_gpio_pad_t pad) {
#if defined(PIN_METHOD_FAST_GPIO)
// Unconfigure the pad for Fast GPIO.
am_hal_gpio_fastgpio_disable(pad);
#endif
}

/*!
@brief Set the NeoPixel output pad number.
@param pad Apollo3 pad number
*/
void Adafruit_NeoPixel::apollo3SetPad(ap3_gpio_pad_t pad) {
#if defined(PIN_METHOD_FAST_GPIO)
// Configure the pad to be used for Fast GPIO.
am_hal_gpio_fastgpio_disable(pad);
am_hal_gpio_fastgpio_clr(pad);

am_hal_gpio_fast_pinconfig((uint64_t)0x1 << pad,
g_AM_HAL_GPIO_OUTPUT, 0);
// uint32_t ui32Ret = am_hal_gpio_fast_pinconfig((uint64_t)0x1 << pad,
// 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(
ap3_gpio_pad_t pad, 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(pad);
//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(pad);
} else {
am_hal_gpio_fastgpio_clr(pad);
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(pad);
//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(pad);
} else {
am_hal_gpio_fastgpio_clr(pad);
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