Initialisation des WS2812 (Neopixel)

CMakeLists.txt

@@ -15,17 +15,24 @@ add_executable(Detection2023
   vl53l1_platform.c
   VL53L1X_api.c
   VL53L1X_calibration.c
+  ws2812.c
   SelectionCapteur.c
 )
+# generate the header file into the source tree as it is included in the RP2040 datasheet
+pico_generate_pio_header(Detection2023 ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio)
+
+
 
 target_link_libraries(Detection2023
   hardware_i2c 
   hardware_uart 
+  hardware_pio 
   pico_stdlib
+
 )
 
 pico_enable_stdio_usb(Detection2023 1)
-pico_enable_stdio_uart(Detection2023 0)
+pico_enable_stdio_uart(Detection2023 1)
 
 pico_add_extra_outputs(Detection2023)
 

main.c

@@ -4,18 +4,25 @@
 #include "VL53L1X_api.h"
 #include "VL53L1X_calibration.h"
 #include "SelectionCapteur.h"
+#include "hardware/pio.h"
+#include "ws2812.h"
+#include "ws2812.pio.h"
 
 #define I2C_SDA_PIN 0
 #define I2C_SCL_PIN 1
 
+
 #define TEST_TIMEOUT_US 10000000
 
 void i2c_master_init(void);
 int continuous_reading(uint8_t device);
 int calibration(uint8_t device);
 int change_address(uint8_t * device, uint8_t new_i2c_7bits_address);
+void initialise_adresses(void);
 void display_menu();
 
+
+
 void main(void)
 {
     int status;
@@ -27,8 +34,8 @@ void main(void)
     Selection_capteur_init();
     Selection_capteur_select(1);
 
-    printf("Waiting to allow user to connect USB serial\n");
+    ws2812_init();
-    sleep_ms(3000);
+
     printf("End waiting\n");
 
     while(1){
@@ -36,9 +43,7 @@ void main(void)
         display_menu();
         
         do{
-            stdio_flush();
             keycode = getchar_timeout_us(TEST_TIMEOUT_US);
-            stdio_flush();
             if(!answer_at_least_once){
                 display_menu();
             }
@@ -61,12 +66,21 @@ void main(void)
             answer_at_least_once=1;
             while(continuous_reading(VL53L1X_device));
             break;
+        default :
+            break;
 
         }
     }
 
 }
 
+void initialise_adresses(void){
+    for(uint capteur=1; capteur<=12; capteur++){
+        Selection_capteur_select(1);
+    }
+    
+}
+
 void display_menu(){
     printf("Select action :\n");
     printf("A - Change I2C address\n");

ws2812.c

@@ -0,0 +1,91 @@
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "ws2812.h"
+#include "ws2812.pio.h"
+
+#define WS2812_PIN 7
+#define IS_RGBW false
+
+
+uint32_t couleur[13];
+uint32_t buffer_couleur[12];
+
+void ws2812_init(){
+    /*couleur[0]=0x000200;
+    couleur[1]=0x010200;
+    couleur[2]=0x020200;
+    couleur[3]=0x020100;
+    couleur[4]=0x020000;
+    couleur[5]=0x020001;
+    couleur[6]=0x020002;
+    couleur[7]=0x010002;
+    couleur[8]=0x000002;
+    couleur[9]=0x000102;
+    couleur[10]=0x000202;
+    couleur[11]=0x000201;
+    couleur[12]=0x000200;*/
+
+    couleur[0]=0x002000;
+    couleur[1]=0x102000;
+    couleur[2]=0x202000;
+    couleur[3]=0x201000;
+    couleur[4]=0x200000;
+    couleur[5]=0x200010;
+    couleur[6]=0x200020;
+    couleur[7]=0x100020;
+    couleur[8]=0x000020;
+    couleur[9]=0x001020;
+    couleur[10]=0x002020;
+    couleur[11]=0x002010;
+    couleur[12]=0x002000;
+
+    /*couleur[0]=0x00FF00;
+    couleur[1]=0x80FF00;
+    couleur[2]=0xFFFF00;
+    couleur[3]=0xFF8000;
+    couleur[4]=0xFF0000;
+    couleur[5]=0xFF0080;
+    couleur[6]=0xFF00FF;
+    couleur[7]=0x8000FF;
+    couleur[8]=0x0000FF;
+    couleur[9]=0x0080FF;
+    couleur[10]=0x00FFFF;
+    couleur[11]=0x00FF80;
+    couleur[12]=0x00FF00;*/
+
+    // initialisation du PIO 
+    PIO pio = pio0;
+    int sm = 0;
+    uint offset = pio_add_program(pio, &ws2812_program);
+
+    ws2812_program_init(pio, sm, offset, WS2812_PIN, 800000, IS_RGBW);
+
+    // Tout rouge !
+    for(uint32_t i = 0; i<12; i++){
+        ws2812_set_buffer_rgb(0x10, 0, 0, i);
+    }
+    ws2812_affiche_buffer();
+}
+
+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);
+}
+
+void ws2812_affiche_buffer(){
+    for(uint32_t i = 0; i<12; i++){
+        put_pixel(buffer_couleur[i]);
+    }
+}
+
+void ws2812_set_buffer_rgb(uint8_t rouge, uint8_t vert, uint8_t bleu, uint8_t index_led){
+    if(index_led <12){
+        buffer_couleur[index_led] = urgb_u32(rouge, vert,bleu);
+    }
+}

ws2812.h

@@ -0,0 +1,5 @@
+#include "pico/stdlib.h"
+
+void ws2812_init(void);
+void ws2812_affiche_buffer(void);
+void ws2812_set_buffer_rgb(uint8_t rouge, uint8_t vert, uint8_t bleu, uint8_t index_led);

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);
+}
+%}