comments and update readme

CMakeLists.txt

@@ -5,7 +5,11 @@ set(PROJECT_MAIN_COMPONENT ${CMAKE_CURRENT_LIST_DIR}/src)
 
 set(EXTRA_COMPONENT_DIRS
     ${CMAKE_CURRENT_LIST_DIR}/config
-    ${CMAKE_CURRENT_LIST_DIR}/src
+    ${CMAKE_CURRENT_LIST_DIR}/src/drivers
+    ${CMAKE_CURRENT_LIST_DIR}/src/main
+    ${CMAKE_CURRENT_LIST_DIR}/src/tasks
+    ${CMAKE_CURRENT_LIST_DIR}/src/ssd
+    ${CMAKE_CURRENT_LIST_DIR}/src/wsled
 )
 
 # For the esp-idf configuration

README.md

@@ -13,8 +13,8 @@ Scripts are in scripts directory, named appropriately.
 - [x] Build setup, get working hello-world program.
 - [x] Develop 7-segment display driver for the soburg-v2 board, which uses 32-bit shift registers.
     Ensures functional hardware interaction and interface design.
-- [ ] Develop WS2812b driver, would be nice to have some kind of testing for this.
-- [ ] Develop WS2812b interface. I like the FastLed library for Arduino so might have a lot of similar functionality.
+- [x] Develop WS2812b driver, would be nice to have some kind of testing for this.
+- [x] Develop WS2812b interface. I like the FastLed library for Arduino so might have a lot of similar functionality.
 - [ ] Implement proper app structure, with error checking and performance profiling
 - [ ] Add a couple LED effects- the random blink and rainbow sweep are easy ones.
 - [ ] Create a mock LED panel that executes natively to test LED effects outside of hardware. (SDL2 or something)
@@ -35,3 +35,11 @@ After cloning: $ ./scripts/repo-setup # installs esp-idf, sets up target configu
 To build:      $ ./scripts/build.sh\
 To flash:      $ ./scripts/flash.sh # note: flash.sh automatically builds\
 To monitor:    $ ./scripts/monitor.sh\
+
+## TODOs for developers
+- [ ] Move all hardware specifications to config/Kconfig.projbuild file. (things like NUM_LEDS, pins.h, ssd_digits, etc.)
+- [ ] Create an effect base class for effects to inherit from
+- [ ] Attach interrupts for hardware inputs
+- [ ] Human I/O (like from buttons, knobs) needs to be in its own io task. Other tasks will be injected with a general I/O interface
+- [ ] Investigate putting the wsled task on a separate core from io and such
+- [ ] Wsled interface needs a platform for matrix creation

scripts/build.sh

@@ -8,6 +8,7 @@ export IDF_PATH=${PWD}/lib/esp-idf
 export SDKCONFIG=${PWD}/config/sdkconfig
 export SDKCONFIG_DEFAULTS=${PWD}/config/sdkconfig.defaults
 
+export IDF_PATH_FORCE=1
 . ${IDF_PATH}/export.sh
 
 idf.py set-target esp32s3

scripts/flash.sh

@@ -8,6 +8,7 @@ export IDF_PATH=${PWD}/lib/esp-idf
 export SDKCONFIG=${PWD}/config/sdkconfig
 export SDKCONFIG_DEFAULTS=${PWD}/config/sdkconfig.defaults
 
+export IDF_PATH_FORCE=1
 . ${IDF_PATH}/export.sh
 
 idf.py fullclean

scripts/monitor.sh

@@ -5,6 +5,7 @@ set -e
 export IDF_TOOLS_PATH=${PWD}/lib/idf-tools
 export IDF_PATH=${PWD}/lib/esp-idf
 
+export IDF_PATH_FORCE=1
 . ${IDF_PATH}/export.sh
 
 idf.py -b 115200 monitor

src/DemoTask.cpp

@@ -1,34 +0,0 @@
-
-#include "DemoTask.hpp"
-
-#include "driver/gpio.h"
-#include "freertos/FreeRTOS.h"
-#include "freertos/task.h"
-#include "esp_log.h"
-
-#include "SsdInterface.hpp"
-#include "pins.hpp"
-
-DemoTask::DemoTask() {
-
-}
-
-void DemoTask::run() {
-
-    ESP_LOGI(__FILE__, "Demo Task: run()");
-
-    ssd_595_t dev = { gpio_ssd_data, gpio_ssd_clk, gpio_ssd_latch, true };
-    SsdInterface ssd(&dev, ssdDigits);
-
-    uint32_t delay = 500; // ms
-    uint8_t digit = 0;
-
-    while(1) {
-        ssd.writeRaw(&digitMap[digit], 1);
-        digit++;
-        if(digit >= 16) digit = 0;
-
-        vTaskDelay(delay / portTICK_PERIOD_MS);
-    }
-
-}

src/drivers/CMakeLists.txt

@@ -2,12 +2,11 @@
 file(GLOB SRC_FILES
     "*.c"
     "*.cpp"
-    "drivers/*.c"
 )
 
 idf_component_register(
     SRCS ${SRC_FILES}
     PRIV_REQUIRES spi_flash
-    REQUIRES esp_driver_gpio
+    REQUIRES esp_driver_gpio esp_driver_spi
     INCLUDE_DIRS "."
 )

src/drivers/wsled.c

@@ -0,0 +1,116 @@
+
+#include "wsled.h"
+
+#include "esp_heap_caps.h"
+#include "esp_log.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static uint16_t* dmaBuffer;
+static size_t dmaBufferSize;
+
+static spi_settings_t spiSettings = {
+    .host = SPI2_HOST,
+    .dma_chan = SPI_DMA_CH_AUTO,
+    .buscfg =
+        {
+            .miso_io_num = -1,
+            .sclk_io_num = -1,
+            .quadwp_io_num = -1,
+            .quadhd_io_num = -1,
+        },
+    .devcfg =
+        {
+            .clock_speed_hz = 3.2 * 1000 * 1000, // Clock out at 3.2 MHz
+            .mode = 0,                           // SPI mode 0
+            .spics_io_num = -1,                  // CS pin
+            .queue_size = 1,
+            .command_bits = 0,
+            .address_bits = 0,
+            //.flags = SPI_DEVICE_TXBIT_LSBFIRST,
+        },
+};
+
+// translations from SPI -> ws2812b protocol
+// [spi] 0b1110 = [ws2812b]0b1 and [spi] 0b1000 = [ws2812b]0b0
+static const uint16_t timingBits[16] = {
+    0x1111, 0x7111, 0x1711, 0x7711, 0x1171, 0x7171, 0x1771, 0x7771,
+    0x1117, 0x7117, 0x1717, 0x7717, 0x1177, 0x7177, 0x1777, 0x7777};
+
+// WS2812b can handle shorter reset delays than the WS2815
+static inline uint32_t resetDelay(const wsled_t* dev) {
+    return (dev->type == WS2812B) ? WSLED_12_RESET_TIME : WSLED_15_RESET_TIME;
+}
+
+esp_err_t wsledInit(const wsled_t* dev) {
+
+    // 12 bytes for each led + bytes for initial zero and reset state
+    dmaBufferSize = dev->numLeds * 12 + (resetDelay(dev) + 1) * 2;
+
+    spiSettings.buscfg.mosi_io_num = dev->pin;
+    spiSettings.buscfg.max_transfer_sz = dmaBufferSize;
+
+    if (ESP_OK != spi_bus_initialize(spiSettings.host, &spiSettings.buscfg, spiSettings.dma_chan)) {
+        ESP_LOGI(__FILE__, "SPI initialization failed");
+        return -1;
+    }
+
+    if (ESP_OK != spi_bus_add_device(spiSettings.host, &spiSettings.devcfg, &spiSettings.spi)) {
+        ESP_LOGI(__FILE__, "Failed to add spi bus device");
+        return -1;
+    }
+
+    dmaBuffer = heap_caps_malloc(dmaBufferSize, MALLOC_CAP_DMA);
+    if (NULL == dmaBuffer) {
+        ESP_LOGI(__FILE__, "Failed to heap_caps_malloc");
+        return -1;
+    }
+    return ESP_OK;
+}
+
+esp_err_t wsledUpdate(const wsled_t* dev, const CRGB* pixels, size_t ledCount) {
+
+    uint32_t n = 0;
+
+    memset(dmaBuffer, 0, dmaBufferSize);
+    dmaBuffer[n++] = 0;
+
+    for (int i = 0; i < ledCount; i++) {
+
+        CRGB currentPixel = pixels[i];
+
+        uint8_t b0 = (dev->type == WS2812B) ? currentPixel.g : currentPixel.r;
+        uint8_t b1 = (dev->type == WS2812B) ? currentPixel.r : currentPixel.g;
+        uint8_t b2 = currentPixel.b;
+
+        // Green
+        dmaBuffer[n++] = timingBits[(b0 >> 4) & 0x0F];
+        dmaBuffer[n++] = timingBits[b0 & 0x0F];
+
+        // Red
+        dmaBuffer[n++] = timingBits[(b1 >> 4) & 0x0F];
+        dmaBuffer[n++] = timingBits[b1 & 0x0F];
+
+        // Blue
+        dmaBuffer[n++] = timingBits[(b2 >> 4) & 0x0F];
+        dmaBuffer[n++] = timingBits[b2 & 0x0F];
+
+    }
+
+    // reset pulse
+    for (int i = 0; i < resetDelay(dev); i++) {
+        dmaBuffer[n++] = 0;
+    }
+
+    esp_err_t error = spi_device_transmit(spiSettings.spi, &(spi_transaction_t) {
+                                                    .length = dmaBufferSize * 8,
+                                                    .tx_buffer = dmaBuffer,
+                                                });
+    return error;
+}
+
+#ifdef __cplusplus
+}
+#endif

src/drivers/wsled.h

@@ -0,0 +1,49 @@
+
+#pragma once
+
+#include "driver/gpio.h"
+#include "driver/spi_master.h"
+#include <stdio.h>
+#include <string.h>
+
+#define WSLED_12_RESET_TIME 5
+#define WSLED_15_RESET_TIME 30
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} CRGB;
+
+typedef enum {
+    WS2812B = 0,
+    WS2815
+} WsledType;
+
+typedef struct {
+    spi_host_device_t host;
+    spi_device_handle_t spi;
+    int dma_chan;
+    spi_device_interface_config_t devcfg;
+    spi_bus_config_t buscfg;
+} spi_settings_t;
+
+typedef struct {
+    gpio_num_t pin;
+    WsledType type;
+    uint32_t numLeds;
+} wsled_t;
+
+// initializes the wsled device provided the device settings 
+esp_err_t wsledInit(const wsled_t* dev);
+
+// outputs the pixel data in pixels to the device
+esp_err_t wsledUpdate(const wsled_t* dev, const CRGB* pixels, size_t ledCount);
+
+#ifdef __cplusplus
+}
+#endif

src/main/App.cpp

@@ -7,7 +7,7 @@
 #include "esp_log.h"
 #include "sdkconfig.h"
 
-#include "pins.hpp"
+#include "shared/pins.h"
 
 #include "DemoTask.hpp"
 

src/main/App.hpp

@@ -3,6 +3,7 @@
 
 #include<stdint.h>
 
+// This class is for managing tasks
 class App {
 
 public:
@@ -14,8 +15,6 @@ public:
 
 private:
 
-    uint32_t ledState = 0;
-    uint32_t blinkTime = 250;
     const char *TAG = "app"; // TODO: instead of this for logging you can use __FILE__ or __func__
 
 };

src/main/CMakeLists.txt

@@ -0,0 +1,10 @@
+
+file(GLOB SRC_FILES
+    "*.c"
+    "*.cpp"
+)
+
+idf_component_register(
+    SRCS ${SRC_FILES}
+    INCLUDE_DIRS "." ".."
+)

src/ssd/CMakeLists.txt

@@ -0,0 +1,12 @@
+
+file(GLOB SRC_FILES
+    "*.c"
+    "*.cpp"
+)
+
+idf_component_register(
+    SRCS ${SRC_FILES}
+    PRIV_REQUIRES spi_flash
+    REQUIRES esp_driver_gpio esp_driver_spi
+    INCLUDE_DIRS "." ".."
+)

src/ssd/SsdInterface.hpp

@@ -4,7 +4,7 @@
 #include "stdint.h"
 
 #include "drivers/ssd.h"
-#include "common.h"
+#include "shared/common.h"
 
 class SsdInterface {
 

src/tasks/CMakeLists.txt

@@ -0,0 +1,12 @@
+
+file(GLOB SRC_FILES
+    "*.c"
+    "*.cpp"
+)
+
+idf_component_register(
+    SRCS ${SRC_FILES}
+    PRIV_REQUIRES spi_flash
+    REQUIRES esp_driver_gpio esp_driver_spi
+    INCLUDE_DIRS "." ".."
+)

src/tasks/DemoTask.cpp

@@ -0,0 +1,46 @@
+
+#include "DemoTask.hpp"
+
+#include "esp_log.h"
+
+#include "ssd/SsdInterface.hpp"
+#include "wsled/WsledInterface.hpp"
+#include "shared/pins.h"
+
+#define NUM_LEDS 4
+
+DemoTask::DemoTask() {
+
+}
+
+void DemoTask::run() {
+
+    ESP_LOGI(__FILE__, "Demo Task: run()");
+
+    // ssd device
+    ssd_595_t ssdDev = { gpio_ssd_data, gpio_ssd_clk, gpio_ssd_latch, true };
+    SsdInterface ssd(&ssdDev, ssdDigits);
+
+    // wsled device
+    wsled_t wsledDev = { gpio_ws2812b, WS2812B, NUM_LEDS};
+    WsledInterface wsled(&wsledDev);
+
+    uint32_t delay = 500; // ms
+    uint8_t digit = 0;
+
+    while(1) {
+
+        // the SSD demo shifts a single hex digit over
+        ssd.writeRaw(&digitMap[digit], 1);
+        digit++;
+        if(digit >= 16) digit = 0;
+
+        // the wsled demo toggles the entire array between red and blue
+        CRGB color = (digit % 2) ? CRGB{100, 20, 20} : CRGB{20, 20, 100};
+        wsled.fill(color);
+        wsled.flush();
+
+        vTaskDelay(delay / portTICK_PERIOD_MS);
+    }
+
+}

src/wsled/CMakeLists.txt

@@ -0,0 +1,12 @@
+
+file(GLOB SRC_FILES
+    "*.c"
+    "*.cpp"
+)
+
+idf_component_register(
+    SRCS ${SRC_FILES}
+    PRIV_REQUIRES spi_flash
+    REQUIRES esp_driver_gpio esp_driver_spi
+    INCLUDE_DIRS "." ".."
+)

src/wsled/WsledInterface.cpp

@@ -0,0 +1,50 @@
+
+#include "WsledInterface.hpp"
+
+WsledInterface::WsledInterface(const wsled_t* device) : device_(device), numLeds_(device->numLeds) {
+
+    (void)wsledInit(device);
+
+    // who cares if its dynamically allocated we have like 4 Mb of ram 
+    // an led strip 1024 long will use 3kb here and 12kb in the driver for dma
+    leds_.resize(numLeds_);
+
+    // turn all leds off
+    (void)fill(CRGB(0, 0, 0));
+    (void)flush();
+
+}
+
+STATUS WsledInterface::writePixel(CRGB pixel, size_t index) {
+    
+    // is it really that easy
+    leds_[index] = pixel;
+
+    return OKAY;
+}
+
+STATUS WsledInterface::get(CRGB* pixel, size_t index) {
+
+    // I could just return the pixel but im so cool and C coded
+    *pixel = leds_[index];
+
+    return OKAY;
+}
+
+STATUS WsledInterface::flush() {
+
+    // man I wrote my driver so well that it really is that easy
+    wsledUpdate(device_, leds_.data(), numLeds_);
+
+    return OKAY;
+}
+
+STATUS WsledInterface::fill(CRGB color) {
+
+    // I HATE ITERATORS YOU CAN NEVER MAKE ME USE THEM !!!!
+    for (size_t i = 0; i < numLeds_; i++) {
+        leds_[i] = color;
+    }
+
+    return OKAY;
+}

src/wsled/WsledInterface.hpp

@@ -0,0 +1,47 @@
+
+#pragma once
+
+#include "stdint.h"
+#include <vector>
+
+#include "drivers/wsled.h"
+#include "shared/common.h"
+
+class WsledInterface {
+
+public:
+
+    WsledInterface(const wsled_t* device);
+    ~WsledInterface() = default;
+
+    // Sets a pixel in the leds buffer to a particular color
+    // index: the order in the strip of the pixel
+    // Returns: execution status
+    STATUS writePixel(CRGB pixel, size_t index);
+
+    // Copies the color currently in a pixel to the pointer
+    // index: the order in the strip of the pixel 
+    // Returns: execution status
+    STATUS get(CRGB* pixel, size_t index);
+
+    // Writes all the data in the leds buffer to hardware
+    // Returns: execution status
+    STATUS flush();
+
+    // Below are the helper functions for manipulating the led buffer
+
+    // Fills the buffer with a single color
+    // Returns: execution status
+    STATUS fill(CRGB color);
+
+    // getter for numLeds_
+    size_t ledCount() { return numLeds_; }
+
+private:
+
+    const wsled_t* device_;
+    size_t numLeds_;
+
+    std::vector<CRGB> leds_;
+
+};