RGB lights working.

FIRMWARE/src/CMakeLists.txt

@@ -1,9 +1,10 @@
-add_executable(${PROJECT_NAME} main.c buttons.c usb_descriptors.c)
+add_executable(${PROJECT_NAME} main.c buttons.c rgb.c usb_descriptors.c)
 
+pico_generate_pio_header(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio)
 target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Werror -Wfatal-errors -O3)
 target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_LIST_DIR})
 target_link_libraries(${PROJECT_NAME} PRIVATE
-    pico_multicore pico_stdlib tinyusb_device tinyusb_board)
+    pico_multicore pico_stdlib hardware_pio tinyusb_device tinyusb_board)
 
 # Make a UF2 binary
 pico_add_extra_outputs(${PROJECT_NAME})

FIRMWARE/src/buttons.c

@@ -9,8 +9,9 @@
 
 #include <stdint.h>
 #include <stdbool.h>
-#include <hardware/gpio.h>
-#include <hardware/timer.h>
+
+#include "hardware/gpio.h"
+#include "hardware/timer.h"
 
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 

FIRMWARE/src/main.c

@@ -11,6 +11,7 @@
 #include "usb_descriptors.h"
 
 #include "buttons.h"
+#include "rgb.h"
 
 uint64_t hid_lights_timeout = 0;
 
@@ -43,11 +44,13 @@ void main_loop()
     }
 }
 
+
 void init()
 {
     board_init();
     tusb_init();
     button_init();
+    rgb_init();
 }
 
 int main(void)
@@ -83,12 +86,15 @@ void tud_hid_set_report_cb(uint8_t itf, uint8_t report_id,
 {
     if ((report_id == REPORT_ID_LIGHTS) &&
         (report_type == HID_REPORT_TYPE_OUTPUT)) {
-        if (bufsize < button_num()) {
+        if (bufsize < button_num() + 3) { /* including logo rgb */
             return;
         }
         for (int i = 0; i < button_num(); i++) {
             button_lights[i] = (buffer[i] > 0);
         }
+        uint8_t const *rgb = buffer + button_num();
+        rgb_update_logo(rgb[0], rgb[1], rgb[2]);
+
         hid_lights_timeout = time_us_64() + 1000000; /* 1 second */
     }
 }

FIRMWARE/src/rgb.c

@@ -0,0 +1,52 @@
+/*
+ * Pico Popn Controller Buttons
+ * WHowe <whowe@gmail.com>
+ * 
+ * A button consists of a switch and an LED
+ */
+
+#include "buttons.h"
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "pico/multicore.h"
+#include "hardware/pio.h"
+
+#include "ws2812.pio.h"
+
+#define WS2812_PIN 28
+
+static inline void put_pixel(uint32_t pixel_grb)
+{
+    pio_sm_put_blocking(pio0, 0, pixel_grb << 8u);
+}
+
+static inline uint32_t urgb_u32(uint8_t r, uint8_t g, uint8_t b)
+{
+    return ((uint32_t)r << 8) | ((uint32_t)g << 16) | (uint32_t)b;
+}
+
+static uint32_t logo_color = 0;
+
+void rgb_update_logo(uint8_t r, uint8_t g, uint8_t b)
+{
+    logo_color = urgb_u32(r, g, b);
+}
+
+void rgb_entry()
+{
+    while (1) {
+        for (int i = 0; i < 10; i++) {
+            put_pixel(logo_color);
+        }
+        sleep_ms(10);
+    }
+}
+
+void rgb_init()
+{
+    uint offset = pio_add_program(pio0, &ws2812_program);
+    ws2812_program_init(pio0, 0, offset, WS2812_PIN, 800000, false);
+    multicore_launch_core1(rgb_entry);
+}

FIRMWARE/src/rgb.h

@@ -0,0 +1,14 @@
+/*
+ * Pico Popn Controller Buttons
+ * WHowe <whowechina@github>
+ */
+
+#ifndef RGB_H
+#define RGB_H
+
+#include <stdint.h>
+
+void rgb_init();
+void rgb_update_logo(uint8_t r, uint8_t g, uint8_t b);
+
+#endif

FIRMWARE/src/usb_descriptors.h

@@ -41,7 +41,7 @@ enum {
 #define GAMECON_REPORT_DESC_LIGHTS(...)                                        \
   HID_USAGE_PAGE(HID_USAGE_PAGE_DESKTOP), HID_USAGE(0x00),                     \
       HID_COLLECTION(HID_COLLECTION_APPLICATION),                              \
-      __VA_ARGS__ HID_REPORT_COUNT(9 + 3), /*LED NUM + RGB */      \
+      __VA_ARGS__ HID_REPORT_COUNT(11 + 3), /*LED NUM + RGB */      \
       HID_REPORT_SIZE(8), HID_LOGICAL_MIN(0x00), HID_LOGICAL_MAX_N(0x00ff, 2), \
       HID_USAGE_PAGE(HID_USAGE_PAGE_ORDINAL), HID_STRING_MINIMUM(4),           \
       HID_STRING_MAXIMUM(16), HID_USAGE_MIN(1), HID_USAGE_MAX(16),             \

FIRMWARE/src/ws2812.pio

@@ -0,0 +1,85 @@
+;
+; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+;
+; SPDX-License-Identifier: BSD-3-Clause
+;
+
+.program ws2812
+.side_set 1
+
+.define public T1 2
+.define public T2 5
+.define public T3 3
+
+.lang_opt python sideset_init = pico.PIO.OUT_HIGH
+.lang_opt python out_init     = pico.PIO.OUT_HIGH
+.lang_opt python out_shiftdir = 1
+
+.wrap_target
+bitloop:
+    out x, 1       side 0 [T3 - 1] ; Side-set still takes place when instruction stalls
+    jmp !x do_zero side 1 [T1 - 1] ; Branch on the bit we shifted out. Positive pulse
+do_one:
+    jmp  bitloop   side 1 [T2 - 1] ; Continue driving high, for a long pulse
+do_zero:
+    nop            side 0 [T2 - 1] ; Or drive low, for a short pulse
+.wrap
+
+% c-sdk {
+#include "hardware/clocks.h"
+
+static inline void ws2812_program_init(PIO pio, uint sm, uint offset, uint pin, float freq, bool rgbw) {
+
+    pio_gpio_init(pio, pin);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
+
+    pio_sm_config c = ws2812_program_get_default_config(offset);
+    sm_config_set_sideset_pins(&c, pin);
+    sm_config_set_out_shift(&c, false, true, rgbw ? 32 : 24);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+
+    int cycles_per_bit = ws2812_T1 + ws2812_T2 + ws2812_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+%}
+
+.program ws2812_parallel
+
+.define public T1 2
+.define public T2 5
+.define public T3 3
+
+.wrap_target
+    out x, 32
+    mov pins, !null [T1-1]
+    mov pins, x     [T2-1]
+    mov pins, null  [T3-2]
+.wrap
+
+% c-sdk {
+#include "hardware/clocks.h"
+
+static inline void ws2812_parallel_program_init(PIO pio, uint sm, uint offset, uint pin_base, uint pin_count, float freq) {
+    for(uint i=pin_base; i<pin_base+pin_count; i++) {
+        pio_gpio_init(pio, i);
+    }
+    pio_sm_set_consecutive_pindirs(pio, sm, pin_base, pin_count, true);
+
+    pio_sm_config c = ws2812_parallel_program_get_default_config(offset);
+    sm_config_set_out_shift(&c, true, true, 32);
+    sm_config_set_out_pins(&c, pin_base, pin_count);
+    sm_config_set_set_pins(&c, pin_base, pin_count);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+
+    int cycles_per_bit = ws2812_parallel_T1 + ws2812_parallel_T2 + ws2812_parallel_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+%}