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add ch32 support #397

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Jul 3, 2024
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add ch32 support #397

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172 changes: 169 additions & 3 deletions Adafruit_NeoPixel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -224,7 +224,162 @@ void Adafruit_NeoPixel::rp2040Show(uint8_t pin, uint8_t *pixels, uint32_t numBy
// Bits for transmission must be shifted to top 8 bits
pio_sm_put_blocking(pio, sm, ((uint32_t)*pixels++)<< 24);
}
#elif defined(ARDUINO_ARCH_CH32)

// F_CPU is defined to SystemCoreClock (not constant number)
#if SYSCLK_FREQ_144MHz_HSE == 144000000 || SYSCLK_FREQ_HSE == 144000000 || \
SYSCLK_FREQ_144MHz_HSI == 144000000 || SYSCLK_FREQ_HSI == 144000000
#define CH32_F_CPU 144000000

#elif SYSCLK_FREQ_120MHz_HSE == 120000000 || SYSCLK_FREQ_HSE == 120000000 || \
SYSCLK_FREQ_120MHz_HSI == 120000000 || SYSCLK_FREQ_HSI == 120000000
#define CH32_F_CPU 120000000

#elif SYSCLK_FREQ_96MHz_HSE == 96000000 || SYSCLK_FREQ_HSE == 96000000 || \
SYSCLK_FREQ_96MHz_HSI == 96000000 || SYSCLK_FREQ_HSI == 96000000
#define CH32_F_CPU 96000000

#elif SYSCLK_FREQ_72MHz_HSE == 72000000 || SYSCLK_FREQ_HSE == 72000000 || \
SYSCLK_FREQ_72MHz_HSI == 72000000 || SYSCLK_FREQ_HSI == 72000000
#define CH32_F_CPU 72000000

#elif SYSCLK_FREQ_56MHz_HSE == 56000000 || SYSCLK_FREQ_HSE == 56000000 || \
SYSCLK_FREQ_56MHz_HSI == 56000000 || SYSCLK_FREQ_HSI == 56000000
#define CH32_F_CPU 56000000

#elif SYSCLK_FREQ_48MHz_HSE == 48000000 || SYSCLK_FREQ_HSE == 48000000 || \
SYSCLK_FREQ_48MHz_HSI == 48000000 || SYSCLK_FREQ_HSI == 48000000
#define CH32_F_CPU 48000000

#endif

static void ch32Show(GPIO_TypeDef* ch_port, uint32_t ch_pin, uint8_t* pixels, uint32_t numBytes, bool is800KHz) {
// not support 400khz
if (!is800KHz) return;

volatile uint32_t* set = &ch_port->BSHR;
volatile uint32_t* clr = &ch_port->BCR;

uint8_t* ptr = pixels;
uint8_t* end = ptr + numBytes;
uint8_t p = *ptr++;
uint8_t bitMask = 0x80;

// NVIC_DisableIRQ(SysTicK_IRQn);

while (1) {
if (p & bitMask) { // ONE
// High 800ns
*set = ch_pin;
__asm volatile ("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;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop;"
#if CH32_F_CPU >= 72000000
"nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 96000000
"nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 120000000
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 144000000
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
);

// Low 450ns
*clr = ch_pin;
__asm volatile ("nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop;"
#if CH32_F_CPU >= 72000000
"nop; nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 96000000
"nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 120000000
"nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 144000000
"nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
);
} else { // ZERO
// High 400ns
*set = ch_pin;
__asm volatile ("nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop;"
#if CH32_F_CPU >= 72000000
"nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 96000000
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 120000000
"nop; nop; nop; "
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 144000000
"nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
);

// Low 850ns
*clr = ch_pin;
__asm volatile ("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;"
"nop; nop; nop; nop; nop;"
#if CH32_F_CPU >= 72000000
"nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 96000000
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 120000000
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop;"
#endif
#if CH32_F_CPU >= 144000000
"nop; nop; nop; nop;"
"nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"
#endif
);
}

if (bitMask >>= 1) {
// Move on to the next pixel
asm("nop;");
}
else {
if (ptr >= end) {
break;
}
p = *ptr++;
bitMask = 0x80;
}
}

// NVIC_EnableIRQ(SysTicK_IRQn);
}
#endif

#if defined(ESP8266)
Expand Down Expand Up @@ -282,8 +437,8 @@ void Adafruit_NeoPixel::show(void) {
// state, computes 'pin high' and 'pin low' values, and writes these back
// to the PORT register as needed.

// NRF52 may use PWM + DMA (if available), may not need to disable interrupt
// ESP32 may not disable interrupts because espShow() uses RMT which tries to acquire locks
// NRF52 may use PWM + DMA (if available), may not need to disable interrupt
// ESP32 may not disable interrupts because espShow() uses RMT which tries to acquire locks
#if !(defined(NRF52) || defined(NRF52_SERIES) || defined(ESP32))
noInterrupts(); // Need 100% focus on instruction timing
#endif
Expand Down Expand Up @@ -3108,6 +3263,8 @@ if(is800KHz) {
}
}

#elif defined(ARDUINO_ARCH_CH32)
ch32Show(gpioPort, gpioPin, pixels, numBytes, is800KHz);
#else
#error Architecture not supported
#endif
Expand Down Expand Up @@ -3141,6 +3298,15 @@ void Adafruit_NeoPixel::setPin(int16_t p) {
#if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_ARDUINO_CORE_STM32)
gpioPort = digitalPinToPort(p);
gpioPin = STM_LL_GPIO_PIN(digitalPinToPinName(p));
#elif defined(ARDUINO_ARCH_CH32)
PinName const pin_name = digitalPinToPinName(pin);
gpioPort = get_GPIO_Port(CH_PORT(pin_name));
gpioPin = CH_GPIO_PIN(pin_name);
#if defined (CH32V20x_D6)
if (gpioPort == GPIOC && ((*(volatile uint32_t*)0x40022030) & 0x0F000000) == 0) {
gpioPin = gpioPin >> 13;
}
#endif
#endif
}

Expand Down Expand Up @@ -3553,4 +3719,4 @@ neoPixelType Adafruit_NeoPixel::str2order(const char *v) {
}
if (w < 0) w = r; // If 'w' not specified, duplicate r bits
return (w << 6) | (r << 4) | ((g & 3) << 2) | (b & 3);
}
}
2 changes: 1 addition & 1 deletion Adafruit_NeoPixel.h
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Original file line number Diff line number Diff line change
Expand Up @@ -398,7 +398,7 @@ class Adafruit_NeoPixel {
volatile uint8_t *port; ///< Output PORT register
uint8_t pinMask; ///< Output PORT bitmask
#endif
#if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_ARDUINO_CORE_STM32)
#if defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_ARDUINO_CORE_STM32) || defined(ARDUINO_ARCH_CH32)
GPIO_TypeDef *gpioPort; ///< Output GPIO PORT
uint32_t gpioPin; ///< Output GPIO PIN
#endif
Expand Down
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