pico scroll library and example

examples/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory(pico_display)
-add_subdirectory(pico_unicorn)
+add_subdirectory(pico_unicorn)
+add_subdirectory(pico_scroll)

examples/pico_scroll/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_executable(
+  scroll
+  demo.cpp
+)
+
+# Pull in pico libraries that we need
+target_link_libraries(scroll pico_stdlib pico_scroll)
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(scroll)

examples/pico_scroll/demo.cpp

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "pico/stdlib.h"
+
+#include "pico_scroll.hpp"
+
+using namespace pimoroni;
+
+PicoScroll pico_scroll;
+
+int main() {
+
+  pico_scroll.init();
+
+  uint32_t i = 0;
+  while(true) {
+    i++;
+
+    pico_scroll.clear();
+
+    for(int y = 0; y < 7; y++) {
+      for(int x = 0; x < 17; x++) {
+        int v = (x + y + (i / 250)) % 2 == 0 ? 0 : 3;
+        pico_scroll.set_pixel(x, y, v);
+      }
+    }
+
+    pico_scroll.update();
+
+    sleep_ms(100);
+  }
+
+  return 0;
+}

libraries/CMakeLists.txt

@@ -1,3 +1,4 @@
 add_subdirectory(pico_graphics)
 add_subdirectory(pico_display)
-add_subdirectory(pico_unicorn)
+add_subdirectory(pico_unicorn)
+add_subdirectory(pico_scroll)

libraries/pico_scroll/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_library(pico_scroll INTERFACE)
+
+target_sources(pico_scroll INTERFACE
+  ${CMAKE_CURRENT_LIST_DIR}/pico_scroll.cpp
+)
+
+target_include_directories(pico_scroll INTERFACE ${CMAKE_CURRENT_LIST_DIR})
+
+# Pull in pico libraries that we need
+target_link_libraries(pico_scroll INTERFACE pico_stdlib hardware_i2c)

libraries/pico_scroll/pico_scroll.cpp

@@ -0,0 +1,93 @@
+#include <string.h>
+#include <math.h>
+
+#include "pico/stdlib.h"
+#include "hardware/i2c.h"
+
+#include "pico_scroll.hpp"
+
+enum pin {
+  SDA   =  4,
+  SCL   =  5,
+  A     = 12,
+  B     = 13,
+  X     = 14,
+  Y     = 15,
+};
+
+enum reg {
+  MODE_REGISTER       = 0x00,
+  FRAME_REGISTER      = 0x01,
+  AUTOPLAY1_REGISTER  = 0x02,
+  AUTOPLAY2_REGISTER  = 0x03,
+  BLINK_REGISTER      = 0x05,
+  AUDIOSYNC_REGISTER  = 0x06,
+  BREATH1_REGISTER    = 0x08,
+  BREATH2_REGISTER    = 0x09,
+  SHUTDOWN_REGISTER   = 0x0a,
+  GAIN_REGISTER       = 0x0b,
+  ADC_REGISTER        = 0x0c,
+  ENABLE_OFFSET       = 0x00,
+  BANK_ADDRESS        = 0xfd,
+  COLOR_OFFSET        = 0x24
+};
+
+void i2c_write(uint8_t reg, const char *data, uint8_t len) {
+  uint8_t buffer[256];
+  buffer[0] = reg;
+  memcpy(&buffer[1], data, len);
+  i2c_write_blocking(i2c0, 0x74, buffer, len + 1, true);
+}
+
+namespace pimoroni {
+
+  void PicoScroll::init() {
+    // setup i2c interface
+    i2c_init(i2c0, 400000);
+
+    gpio_set_function(pin::SDA, GPIO_FUNC_I2C); gpio_pull_up(pin::SDA);
+    gpio_set_function(pin::SCL, GPIO_FUNC_I2C); gpio_pull_up(pin::SCL);
+
+    i2c_write(reg::BANK_ADDRESS, "\x0b", 1);
+    i2c_write(reg::MODE_REGISTER, "\x00", 1);
+    i2c_write(reg::AUDIOSYNC_REGISTER, "\x00", 1);
+    i2c_write(reg::SHUTDOWN_REGISTER, "\x01", 1);
+    i2c_write(reg::BANK_ADDRESS, "\x0b", 1);
+    i2c_write(reg::FRAME_REGISTER, "\x00", 1);
+    i2c_write(reg::BANK_ADDRESS, "\x00", 1);
+    i2c_write(reg::ENABLE_OFFSET, "\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x7f\x00", 18);
+
+    // setup button inputs
+    gpio_set_function(pin::A, GPIO_FUNC_SIO); gpio_set_dir(pin::A, GPIO_IN); gpio_pull_up(pin::A);
+    gpio_set_function(pin::B, GPIO_FUNC_SIO); gpio_set_dir(pin::B, GPIO_IN); gpio_pull_up(pin::B);
+    gpio_set_function(pin::X, GPIO_FUNC_SIO); gpio_set_dir(pin::X, GPIO_IN); gpio_pull_up(pin::X);
+    gpio_set_function(pin::Y, GPIO_FUNC_SIO); gpio_set_dir(pin::Y, GPIO_IN); gpio_pull_up(pin::Y);
+  }
+
+  void PicoScroll::set_pixel(uint8_t x, uint8_t y, uint8_t v) {
+    if(x < 0 || x > 16 || y < 0 || y > 6) return;
+
+    y = 6 - y;
+    if(x > 8) {
+      x = x - 8;
+      y = 6 - (y + 8);
+    }else{
+      x = 8 - x;
+    }
+
+    uint8_t o = x * 16 + y;
+    __fb[o] = v;
+  }
+
+  bool PicoScroll::is_pressed(uint8_t button) {
+    return !gpio_get(button);
+  }
+
+  void PicoScroll::clear() {
+    memset(__fb, 0, 144);
+  }
+
+  void PicoScroll::update() {
+    i2c_write(COLOR_OFFSET, (const char *)__fb, 144);
+  }
+}

libraries/pico_scroll/pico_scroll.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace pimoroni {
+
+  class PicoScroll {
+    uint8_t __fb[144];
+
+  public:
+    void init();
+    void update();
+    void set_pixel(uint8_t x, uint8_t y, uint8_t v);
+    void clear();
+    bool is_pressed(uint8_t button);
+
+    static const uint8_t A = 12;
+    static const uint8_t B = 13;
+    static const uint8_t X = 14;
+    static const uint8_t Y = 15;
+  };
+
+}