diff options
| -rw-r--r-- | docs/esp8266/quickref.rst | 20 | ||||
| -rw-r--r-- | esp8266/Makefile | 1 | ||||
| -rw-r--r-- | esp8266/espapa102.c | 110 | ||||
| -rw-r--r-- | esp8266/espapa102.h | 27 | ||||
| -rw-r--r-- | esp8266/modesp.c | 12 | ||||
| -rw-r--r-- | esp8266/scripts/apa102.py | 28 |
6 files changed, 198 insertions, 0 deletions
diff --git a/docs/esp8266/quickref.rst b/docs/esp8266/quickref.rst index d2d677dc79..7b246a65e1 100644 --- a/docs/esp8266/quickref.rst +++ b/docs/esp8266/quickref.rst @@ -271,6 +271,26 @@ For low-level driving of a NeoPixel:: import esp esp.neopixel_write(pin, grb_buf, is800khz) +APA102 driver +------------- + +Use the ``apa102`` module:: + + from machine import Pin + from apa102 import APA102 + + clock = Pin(14, Pin.OUT) # set GPIO14 to output to drive the clock + data = Pin(13, Pin.OUT) # set GPIO13 to output to drive the data + apa = APA102(clock, data, 8) # create APA102 driver on the clock and the data pin for 8 pixels + apa[0] = (255, 255, 255, 31) # set the first pixel to white with a maximum brightness of 31 + apa.write() # write data to all pixels + r, g, b, brightness = apa[0] # get first pixel colour + +For low-level driving of an APA102:: + + import esp + esp.apa102_write(clock_pin, data_pin, rgbi_buf) + WebREPL (web browser interactive prompt) ---------------------------------------- diff --git a/esp8266/Makefile b/esp8266/Makefile index d8786301a8..2d65b4bd6d 100644 --- a/esp8266/Makefile +++ b/esp8266/Makefile @@ -65,6 +65,7 @@ SRC_C = \ esppwm.c \ esponewire.c \ espneopixel.c \ + espapa102.c \ intr.c \ modpyb.c \ modpybpin.c \ diff --git a/esp8266/espapa102.c b/esp8266/espapa102.c new file mode 100644 index 0000000000..e5f3024b10 --- /dev/null +++ b/esp8266/espapa102.c @@ -0,0 +1,110 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2016 Robert Foss, Daniel Busch + * + * 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 <stdio.h> +#include "c_types.h" +#include "eagle_soc.h" +#include "user_interface.h" +#include "espapa102.h" + +#define NOP asm volatile(" nop \n\t") + +static inline void _esp_apa102_send_byte(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t byte) { + for (uint32_t i = 0; i < 8; i++) { + if (byte & 0x80) { + // set data pin high + GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask); + } else { + // set data pin low + GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, dataPinMask); + } + + // set clock pin high + GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask); + byte <<= 1; + NOP; + NOP; + + // set clock pin low + GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask); + NOP; + NOP; + } +} + +static inline void _esp_apa102_send_colors(uint32_t clockPinMask, uint32_t dataPinMask, uint8_t *pixels, uint32_t numBytes) { + for (uint32_t i = 0; i < numBytes / 4; i++) { + _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 3] | 0xE0); + _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 2]); + _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4 + 1]); + _esp_apa102_send_byte(clockPinMask, dataPinMask, pixels[i * 4]); + } +} + +static inline void _esp_apa102_start_frame(uint32_t clockPinMask, uint32_t dataPinMask) { + for (uint32_t i = 0; i < 4; i++) { + _esp_apa102_send_byte(clockPinMask, dataPinMask, 0x00); + } +} + +static inline void _esp_apa102_append_additionial_cycles(uint32_t clockPinMask, uint32_t dataPinMask, uint32_t numBytes) { + GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, dataPinMask); + + // we need to write some more clock cycles, because each led + // delays the data by one edge after inverting the clock + for (uint32_t i = 0; i < numBytes / 8 + ((numBytes / 4) % 2); i++) { + GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, clockPinMask); + NOP; + NOP; + + GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, clockPinMask); + NOP; + NOP; + } +} + +static inline void _esp_apa102_end_frame(uint32_t clockPinMask, uint32_t dataPinMask) { + for (uint32_t i = 0; i < 4; i++) { + _esp_apa102_send_byte(clockPinMask, dataPinMask, 0xFF); + } +} + +void esp_apa102_write(uint8_t clockPin, uint8_t dataPin, uint8_t *pixels, uint32_t numBytes) { + uint32_t clockPinMask, dataPinMask; + + clockPinMask = 1 << clockPin; + dataPinMask = 1 << dataPin; + + // start the frame + _esp_apa102_start_frame(clockPinMask, dataPinMask); + + // write pixels + _esp_apa102_send_colors(clockPinMask, dataPinMask, pixels, numBytes); + + // end the frame + _esp_apa102_append_additionial_cycles(clockPinMask, dataPinMask, numBytes); + _esp_apa102_end_frame(clockPinMask, dataPinMask); +} diff --git a/esp8266/espapa102.h b/esp8266/espapa102.h new file mode 100644 index 0000000000..82c92025d3 --- /dev/null +++ b/esp8266/espapa102.h @@ -0,0 +1,27 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2016 Robert Foss, Daniel Busch + * + * 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. + */ + +void esp_apa102_write(uint8_t clockPin, uint8_t dataPin, uint8_t *pixels, uint32_t numBytes); diff --git a/esp8266/modesp.c b/esp8266/modesp.c index 885e7ae95e..4b0c0e4668 100644 --- a/esp8266/modesp.c +++ b/esp8266/modesp.c @@ -43,6 +43,7 @@ #include "spi_flash.h" #include "mem.h" #include "espneopixel.h" +#include "espapa102.h" #include "modpyb.h" #define MODESP_ESPCONN (0) @@ -636,6 +637,16 @@ STATIC mp_obj_t esp_neopixel_write_(mp_obj_t pin, mp_obj_t buf, mp_obj_t is800k) } STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp_neopixel_write_obj, esp_neopixel_write_); +STATIC mp_obj_t esp_apa102_write_(mp_obj_t clockPin, mp_obj_t dataPin, mp_obj_t buf) { + mp_buffer_info_t bufinfo; + mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ); + esp_apa102_write(mp_obj_get_pin_obj(clockPin)->phys_port, + mp_obj_get_pin_obj(dataPin)->phys_port, + (uint8_t*)bufinfo.buf, bufinfo.len); + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp_apa102_write_obj, esp_apa102_write_); + STATIC mp_obj_t esp_freemem() { return MP_OBJ_NEW_SMALL_INT(system_get_free_heap_size()); } @@ -679,6 +690,7 @@ STATIC const mp_map_elem_t esp_module_globals_table[] = { { MP_OBJ_NEW_QSTR(MP_QSTR_getaddrinfo), (mp_obj_t)&esp_getaddrinfo_obj }, #endif { MP_OBJ_NEW_QSTR(MP_QSTR_neopixel_write), (mp_obj_t)&esp_neopixel_write_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_apa102_write), (mp_obj_t)&esp_apa102_write_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_freemem), (mp_obj_t)&esp_freemem_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_meminfo), (mp_obj_t)&esp_meminfo_obj }, { MP_OBJ_NEW_QSTR(MP_QSTR_info), (mp_obj_t)&pyb_info_obj }, // TODO delete/rename/move elsewhere diff --git a/esp8266/scripts/apa102.py b/esp8266/scripts/apa102.py new file mode 100644 index 0000000000..126448cc20 --- /dev/null +++ b/esp8266/scripts/apa102.py @@ -0,0 +1,28 @@ +# APA102 driver for MicroPython on ESP8266 +# MIT license; Copyright (c) 2016 Robert Foss, Daniel Busch + +from esp import apa102_write + +class APA102: + def __init__(self, clock_pin, data_pin, n): + self.clock_pin = clock_pin + self.data_pin = data_pin + self.n = n + self.buf = bytearray(n * 4) + + self.clock_pin.init(clock_pin.OUT) + self.data_pin.init(data_pin.OUT) + + def __setitem__(self, index, val): + r, g, b, brightness = val + self.buf[index * 4] = r + self.buf[index * 4 + 1] = g + self.buf[index * 4 + 2] = b + self.buf[index * 4 + 3] = brightness + + def __getitem__(self, index): + i = index * 4 + return self.buf[i], self.buf[i + 1], self.buf[i + 2], self.buf[i + 3] + + def write(self): + apa102_write(self.clock_pin, self.data_pin, self.buf) |