add uart framework

include/component.h

@@ -6,7 +6,8 @@
 
 // component type
 enum {
-  BUTTON_TYPE = 1, SWITCH_TYPE, NAIVE_LED_TYPE, RGB_LED_TYPE, SEGS7_TYPE, VGA_TYPE, KEYBOARD_TYPE
+  BUTTON_TYPE = 1, SWITCH_TYPE, NAIVE_LED_TYPE, RGB_LED_TYPE, SEGS7_TYPE,
+  VGA_TYPE, KEYBOARD_TYPE, UART_TYPE
 };
 
 // logic type

include/pins.h

@@ -13,10 +13,6 @@ typedef struct PinNode {
 } PinNode;
 extern PinNode pin_array[];
 
-static inline bool is_input_pin(int pin) {
-  return (pin < NR_INPUT_PINS);
-}
-
 static inline uint8_t pin_peek(int pin) {
   PinNode *p = &pin_array[pin];
   if (p->vector_len == 1) {

include/uart.h

@@ -0,0 +1,19 @@
+#ifndef _NVBOARD_UART_H
+#define _NVBOARD_UART_H
+
+#include <component.h>
+#include <string>
+
+class UART : public Component{
+private:
+  int region_w, region_h;
+  std::string str;
+public:
+  UART(SDL_Renderer *rend, int cnt, int init_val, int ct);
+  ~UART();
+
+  virtual void update_gui();
+  virtual void update_state();
+};
+
+#endif

src/component.cpp

@@ -96,7 +96,7 @@ void RGB_LED::update_state() {
 #endif
 
 void init_components(SDL_Renderer *renderer) {
-#define COMPONENT_LIST(f) f(led) f(switch) f(button) f(segs7) f(keyboard) f(vga)
+#define COMPONENT_LIST(f) f(led) f(switch) f(button) f(segs7) f(keyboard) f(vga) f(uart)
 #define INIT_FN(c) { void concat(init_, c)(SDL_Renderer *); concat(init_, c)(renderer); }
   COMPONENT_LIST(INIT_FN);
 }

src/font.cpp

@@ -7,18 +7,19 @@ void init_font() {
   int ret = TTF_Init();
   assert(ret != -1);
   std::string nvboard_home = getenv("NVBOARD_HOME");
-  font = TTF_OpenFont((nvboard_home + "/resources/font/" + "FreeMono.ttf").c_str(), 28);
+  font = TTF_OpenFont((nvboard_home + "/resources/font/" + "FreeMono.ttf").c_str(), 16);
   assert(font != NULL);
 }
 
-void test_font(SDL_Renderer *renderer) {
-  SDL_Color c = {.r = 0xff, .g = 0xff, .b = 0xff };
-  SDL_Surface *s = TTF_RenderText_Solid_Wrapped(font, "abc", c, 0);
+SDL_Texture* render_str(SDL_Renderer *renderer, std::string str, int wrap_len_in_pixel, int *w, int *h) {
+  SDL_Color c = {.r = 0x00, .g = 0x00, .b = 0x00 };
+  SDL_Surface *s = TTF_RenderText_Solid_Wrapped(font, str.c_str(), c, wrap_len_in_pixel);
+  assert(s != NULL);
   SDL_Texture *t = SDL_CreateTextureFromSurface(renderer, s);
-  SDL_Rect r = { 0, 0, s->w, s->h };
-  SDL_RenderCopy(renderer, t, NULL, &r);
+  assert(t != NULL);
+  *w = s->w; *h = s->h;
   SDL_FreeSurface(s);
-  SDL_DestroyTexture(t);
+  return t;
 }
 
 void close_font() {

src/nvboard.cpp

@@ -77,16 +77,15 @@ void nvboard_init(int vga_clk_cycle) {
     #endif
         0
     );
+    SDL_SetRenderDrawColor(main_renderer, 0xff, 0xff, 0xff, 0);
+
+    void init_font();
+    init_font();
 
     init_render(main_renderer);
     init_components(main_renderer);
     init_gui(main_renderer);
 
-    void init_font();
-    void test_font(SDL_Renderer *renderer);
-    init_font();
-    test_font(main_renderer);
-
     for (int i = 0; i < NR_PINS; i ++) {
       if (pin_array[i].ptr == NULL) pin_array[i].ptr = &pin_array[i].data;
     }

src/uart.cpp

@@ -0,0 +1,50 @@
+#include <nvboard.h>
+#include <uart.h>
+
+UART* uart = NULL;
+
+SDL_Texture* render_str(SDL_Renderer *renderer, std::string str, int wrap_len_in_pixel, int *w, int *h);
+
+UART::UART(SDL_Renderer *rend, int cnt, int init_val, int ct):
+    Component(rend, cnt, init_val, ct),
+    region_w(WINDOW_WIDTH / 2), region_h(WINDOW_HEIGHT / 2), str(" ") {
+  SDL_Texture *temp_texture = SDL_CreateTexture(rend, SDL_PIXELFORMAT_ARGB8888,
+    SDL_TEXTUREACCESS_STREAMING, region_w, region_h);
+  set_texture(temp_texture, 0);
+}
+
+UART::~UART() {
+  SDL_DestroyTexture(get_texture(0));
+}
+
+void UART::update_gui() {
+  SDL_Renderer *r = get_renderer();
+  SDL_Rect rect = *get_rect(0);
+  SDL_RenderFillRect(r, &rect);
+  int w = 0, h = 0;
+  SDL_Texture *t = render_str(r, str, region_w, &w, &h);
+  rect.w = w; rect.h = h;
+  SDL_RenderCopy(r, t, NULL, &rect);
+  SDL_DestroyTexture(t);
+  set_redraw();
+}
+
+void UART::update_state() {
+  static int i = 0;
+  i ++;
+  if (i < 10) return;
+  i = 0;
+  char last = str[str.length() - 1];
+  str += last + 1;
+  update_gui();
+}
+
+void init_uart(SDL_Renderer *renderer) {
+  uart = new UART(renderer, 1, 0, UART_TYPE);
+  SDL_Rect *rect_ptr = new SDL_Rect;
+  *rect_ptr = (SDL_Rect){WINDOW_WIDTH / 2, 0, WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2};
+  uart->set_rect(rect_ptr, 0);
+  uart->add_pin(UART_TX);
+  uart->add_pin(UART_RX);
+  add_component(uart);
+}

usr/include/pins.h

@@ -30,7 +30,8 @@
                          SEG6A, SEG6B, SEG6C, SEG6D, SEG6E, SEG6F, SEG6G, DEC6P, \
                          SEG7A, SEG7B, SEG7C, SEG7D, SEG7E, SEG7F, SEG7G, DEC7P
 
-//#define UART_OUTPUT
+#define UART_OUTPUT UART_TX
+#define UART_INPUT  UART_RX
 
 #define VGA_OUTPUT VGA_VSYNC, VGA_HSYNC, VGA_BLANK_N,  \
                    VGA_R0, VGA_R1, VGA_R2, VGA_R3, VGA_R4, VGA_R5, VGA_R6, VGA_R7, \
@@ -43,14 +44,14 @@ enum {
   BTN_INPUT,
   SW_INPUT,
   KEYBOARD_INPUT,
-  NR_INPUT_PINS,
+  UART_INPUT,
+
   NAIVE_LEDS_OUTPUT,
   RGB_LEDS_OUTPUT,
-  SEG7_ENBS_OUTPUT,
   SEG7_SEGS_OUTPUT,
   VGA_OUTPUT,
+  UART_OUTPUT,
   NR_PINS,
-  NR_OUTPUT_PINS = NR_PINS - NR_INPUT_PINS
 };
 
 #endif