/* WS2812Serial - Non-blocking WS2812 LED Display Library https://github.com/PaulStoffregen/WS2812Serial Copyright (c) 2017 Paul Stoffregen, PJRC.COM, LLC Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "WS2812Serial.h" bool WS2812Serial::begin() { uint32_t divisor, portconfig, hwtrigger; KINETISK_UART_t *uart; switch (pin) { #if defined(KINETISK) // Teensy 3.x case 1: // Serial1 case 5: #if defined(__MK64FX512__) || defined(__MK66FX1M0__) case 26: #endif uart = &KINETISK_UART0; divisor = BAUD2DIV(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART0_TX; SIM_SCGC4 |= SIM_SCGC4_UART0; break; case 10: // Serial2 #if defined(__MK20DX128__) || defined(__MK20DX256__) case 31: #elif defined(__MK64FX512__) || defined(__MK66FX1M0__) case 58: #endif uart = &KINETISK_UART1; divisor = BAUD2DIV2(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART1_TX; SIM_SCGC4 |= SIM_SCGC4_UART1; break; case 8: // Serial3 uart = &KINETISK_UART2; divisor = BAUD2DIV3(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART2_TX; SIM_SCGC4 |= SIM_SCGC4_UART2; break; #if defined(__MK64FX512__) || defined(__MK66FX1M0__) case 32: // Serial4 case 62: uart = &KINETISK_UART3; divisor = BAUD2DIV3(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART3_TX; SIM_SCGC4 |= SIM_SCGC4_UART3; break; case 33: // Serial5 uart = &KINETISK_UART4; divisor = BAUD2DIV3(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART4_RXTX; SIM_SCGC1 |= SIM_SCGC1_UART4; break; #endif #if defined(__MK64FX512__) case 48: // Serial6 uart = &KINETISK_UART5; divisor = BAUD2DIV3(4000000); portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART5_RXTX; SIM_SCGC1 |= SIM_SCGC1_UART5; break; #endif #elif defined(KINETISL) // Teensy LC case 1: // Serial1 case 5: uart = &KINETISK_UART0; divisor = 1; portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); hwtrigger = DMAMUX_SOURCE_UART0_TX; SIM_SCGC4 |= SIM_SCGC4_UART0; break; case 4: uart = &KINETISK_UART0; divisor = 1; portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(2); hwtrigger = DMAMUX_SOURCE_UART0_TX; SIM_SCGC4 |= SIM_SCGC4_UART0; break; case 24: uart = &KINETISK_UART0; divisor = 1; portconfig = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(4); hwtrigger = DMAMUX_SOURCE_UART0_TX; SIM_SCGC4 |= SIM_SCGC4_UART0; break; #endif default: return false; // pin not supported } if (!dma) { dma = new DMAChannel; if (!dma) return false; // unable to allocate DMA channel } #if defined(KINETISK) if (divisor < 32) divisor = 32; uart->BDH = (divisor >> 13) & 0x1F; uart->BDL = (divisor >> 5) & 0xFF; uart->C4 = divisor & 0x1F; #elif defined(KINETISL) uart->BDH = (divisor >> 8) & 0x1F; uart->BDL = divisor & 0xFF; uart->C4 = 11; #endif uart->C1 = 0; uart->C2 = UART_C2_TE | UART_C2_TIE; uart->C3 = UART_C3_TXINV; uart->C5 = UART_C5_TDMAS; #if defined(KINETISK) uart->PFIFO = 0; // TODO: is this ok for Serial3-6? #endif *(portConfigRegister(pin)) = portconfig; dma->destination(uart->D); dma->triggerAtHardwareEvent(hwtrigger); memset(drawBuffer, 0, numled * 3); return true; } void WS2812Serial::show() { // wait if prior DMA still in progress #if defined(KINETISK) while ((DMA_ERQ & (1 << dma->channel))) { yield(); } #elif defined(KINETISL) while ((dma->CFG->DCR & DMA_DCR_ERQ)) { yield(); } #endif // copy drawing buffer to frame buffer const uint8_t *p = drawBuffer; const uint8_t *end = p + (numled * 3); uint8_t *fb = frameBuffer; while (p < end) { uint8_t b = *p++; uint8_t g = *p++; uint8_t r = *p++; uint32_t n=0; switch (config) { case WS2812_RGB: n = (r << 16) | (g << 8) | b; break; case WS2812_RBG: n = (r << 16) | (b << 8) | g; break; case WS2812_GRB: n = (g << 16) | (r << 8) | b; break; case WS2812_GBR: n = (g << 16) | (b << 8) | r; break; case WS2812_BRG: n = (b << 16) | (r << 8) | g; break; case WS2812_BGR: n = (b << 16) | (g << 8) | r; break; } const uint8_t *stop = fb + 12; do { uint8_t x = 0x08; if (!(n & 0x00800000)) x |= 0x07; if (!(n & 0x00400000)) x |= 0xE0; n <<= 2; *fb++ = x; } while (fb < stop); } // wait 300us WS2812 reset time uint32_t min_elapsed = (numled * 30) + 300; if (min_elapsed < 2500) min_elapsed = 2500; uint32_t m; while (1) { m = micros(); if ((m - prior_micros) > min_elapsed) break; yield(); } prior_micros = m; // start DMA transfer to update LEDs :-) #if defined(KINETISK) dma->sourceBuffer(frameBuffer, numled * 12); dma->transferSize(1); dma->transferCount(numled * 12); dma->disableOnCompletion(); dma->enable(); #elif defined(KINETISL) dma->CFG->SAR = frameBuffer; dma->CFG->DSR_BCR = 0x01000000; dma->CFG->DSR_BCR = numled * 12; dma->CFG->DCR = DMA_DCR_ERQ | DMA_DCR_CS | DMA_DCR_SSIZE(1) | DMA_DCR_SINC | DMA_DCR_DSIZE(1) | DMA_DCR_D_REQ; #endif }