Suzu Tomo / WS2812B_SPI

WS2812B Liblary this use SPI

WS2812B.cpp@1:c7bb475f0022, 2019-01-20 (annotated)

Committer:
Suzutomo
Date:
Sun Jan 20 09:05:07 2019 +0000
Revision:
1:c7bb475f0022
Parent:
0:6a2dcf5cd545
Child:
3:c0a82b9775e6
change F446 SPIfre 2300000 -> 2250000

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Suzutomo 0:6a2dcf5cd545 1 //--------------------------------------------------------
Suzutomo 0:6a2dcf5cd545 2 // SPI を使って WS2812B を点灯するためのクラス
Suzutomo 0:6a2dcf5cd545 3 // サポートするボード： Nucleo-F401RE, Nucleo-F446RE
Suzutomo 0:6a2dcf5cd545 4 //
Suzutomo 0:6a2dcf5cd545 5 // 2016/11/21, Copyright (c) 2016 MIKAMI, Naoki
Suzutomo 0:6a2dcf5cd545 6 //--------------------------------------------------------
Suzutomo 0:6a2dcf5cd545 7
Suzutomo 0:6a2dcf5cd545 8 #include "WS2812B.h"
Suzutomo 0:6a2dcf5cd545 9 #include "PeripheralPins.h" // for pinmap_peripheral()
Suzutomo 0:6a2dcf5cd545 10
Suzutomo 0:6a2dcf5cd545 11 WS2812B::WS2812B(PinName pin, bool inv)
Suzutomo 0:6a2dcf5cd545 12 : spi_(pin, NC, NC),
Suzutomo 0:6a2dcf5cd545 13 mySpi_((SPI_TypeDef *)pinmap_peripheral(pin, PinMap_SPI_MOSI))
Suzutomo 0:6a2dcf5cd545 14 {
Suzutomo 0:6a2dcf5cd545 15 spi_.format(8, 0);
Suzutomo 0:6a2dcf5cd545 16 // クロックを 23 MHz 以下で最大の値に設定
Suzutomo 0:6a2dcf5cd545 17 // F401RE: 21.0 MHz
Suzutomo 0:6a2dcf5cd545 18 // F446RE: 22.5 MHz
Suzutomo 0:6a2dcf5cd545 19 #if defined(STM32F446xx)
Suzutomo 1:c7bb475f0022 20 spi_.frequency(22500000);
Suzutomo 0:6a2dcf5cd545 21 #elif defined(STM32F401xE)
Suzutomo 0:6a2dcf5cd545 22 spi_.frequency(21000000);
Suzutomo 0:6a2dcf5cd545 23 #else
Suzutomo 0:6a2dcf5cd545 24 #error This code is not move this board.
Suzutomo 0:6a2dcf5cd545 25 #endif
Suzutomo 0:6a2dcf5cd545 26 if (!inv) fp = &WS2812B::SendByteNorm;
Suzutomo 0:6a2dcf5cd545 27 else fp = &WS2812B::SendByteInv;
Suzutomo 0:6a2dcf5cd545 28 }
Suzutomo 0:6a2dcf5cd545 29
Suzutomo 0:6a2dcf5cd545 30 void WS2812B::Write(uint32_t x)
Suzutomo 0:6a2dcf5cd545 31 {
Suzutomo 0:6a2dcf5cd545 32 static const uint32_t bit23 = 0x800000;
Suzutomo 0:6a2dcf5cd545 33 for (int n=0; n<24; n++)
Suzutomo 0:6a2dcf5cd545 34 {
Suzutomo 0:6a2dcf5cd545 35 if ((x & bit23) == bit23) T1HL();
Suzutomo 0:6a2dcf5cd545 36 else T0HL();
Suzutomo 0:6a2dcf5cd545 37 x <<= 1;
Suzutomo 0:6a2dcf5cd545 38 }
Suzutomo 0:6a2dcf5cd545 39 }
Suzutomo 0:6a2dcf5cd545 40
Suzutomo 0:6a2dcf5cd545 41 void WS2812B::Write(uint32_t x, int k)
Suzutomo 0:6a2dcf5cd545 42 {
Suzutomo 0:6a2dcf5cd545 43 for (int n=0; n<k; n++) Write(x);
Suzutomo 0:6a2dcf5cd545 44 }
Suzutomo 0:6a2dcf5cd545 45
Suzutomo 0:6a2dcf5cd545 46 void WS2812B::Clear(int k)
Suzutomo 0:6a2dcf5cd545 47 {
Suzutomo 0:6a2dcf5cd545 48 for (int n=0; n<k; n++) Write(0x000000);
Suzutomo 0:6a2dcf5cd545 49 Reset();
Suzutomo 0:6a2dcf5cd545 50 }
Suzutomo 0:6a2dcf5cd545 51
Suzutomo 0:6a2dcf5cd545 52 void WS2812B::Send3Bytes(uint8_t x0, uint8_t x1, uint8_t x2)
Suzutomo 0:6a2dcf5cd545 53 {
Suzutomo 0:6a2dcf5cd545 54 SendByte(x0);
Suzutomo 0:6a2dcf5cd545 55 SendByte(x1);
Suzutomo 0:6a2dcf5cd545 56 SendByte(x2);
Suzutomo 0:6a2dcf5cd545 57 }
Suzutomo 0:6a2dcf5cd545 58
Suzutomo 0:6a2dcf5cd545 59 void WS2812B::SendByteNorm(uint8_t x)
Suzutomo 0:6a2dcf5cd545 60 {
Suzutomo 0:6a2dcf5cd545 61 while ((mySpi_->SR & SPI_SR_TXE) != SPI_SR_TXE) {}
Suzutomo 0:6a2dcf5cd545 62 mySpi_->DR = x;
Suzutomo 0:6a2dcf5cd545 63 }
Suzutomo 0:6a2dcf5cd545 64
Suzutomo 0:6a2dcf5cd545 65 void WS2812B::SendByteInv(uint8_t x)
Suzutomo 0:6a2dcf5cd545 66 {
Suzutomo 0:6a2dcf5cd545 67 while ((mySpi_->SR & SPI_SR_TXE) != SPI_SR_TXE) {}
Suzutomo 0:6a2dcf5cd545 68 mySpi_->DR = ~x;
Suzutomo 0:6a2dcf5cd545 69 }
Suzutomo 0:6a2dcf5cd545 70