mirror of
https://github.com/isometimes/rpi4-osdev
synced 2024-11-12 13:20:39 +00:00
468 lines
12 KiB
C
468 lines
12 KiB
C
#include "io.h"
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#include "bt.h"
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#include "fb.h"
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#define MAX_MSG_LEN 50
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#define MAX_READ_RUN 100
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unsigned char data_buf[MAX_MSG_LEN];
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unsigned int data_len;
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unsigned int messages_received = 0;
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unsigned int poll_state = 0;
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enum {
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LE_EVENT_CODE = 0x3e,
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LE_CONNECT_CODE = 0x01,
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LE_ADREPORT_CODE = 0x02,
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HCI_ACL_PKT = 0x02,
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HCI_EVENT_PKT = 0x04
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};
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unsigned int got_echo_sid = 0;
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unsigned int got_echo_name = 0;
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unsigned char echo_addr[6];
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unsigned int connected = 0;
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unsigned int connection_handle = 0;
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unsigned char dir = 50;
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int memcmp(const char *str1, const char *str2, int count) {
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const char *s1 = (const char*)str1;
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const char *s2 = (const char*)str2;
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while (count-- > 0) {
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if (*s1++ != *s2++) return s1[-1] < s2[-1] ? -1 : 1;
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}
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return 0;
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}
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void hci_poll2(unsigned char byte)
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{
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switch (poll_state) {
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case 0:
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if (byte != HCI_EVENT_PKT) poll_state = 0;
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else poll_state = 1;
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break;
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case 1:
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if (byte != LE_EVENT_CODE) poll_state = 0;
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else poll_state = 2;
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break;
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case 2:
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if (byte > MAX_MSG_LEN) poll_state = 0;
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else {
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poll_state = 3;
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data_len = byte;
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}
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break;
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default:
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data_buf[poll_state - 3] = byte;
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if (poll_state == data_len + 3 - 1) {
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messages_received++;
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poll_state = 0;
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} else poll_state++;
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}
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}
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unsigned char *hci_poll()
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{
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unsigned int goal = messages_received + 1;
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if (bt_isReadByteReady()) {
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unsigned int run = 0;
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while (run < MAX_READ_RUN && messages_received < goal && bt_isReadByteReady()) {
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unsigned char byte = bt_readByte();
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hci_poll2(byte);
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run++;
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}
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if (run == MAX_READ_RUN) return 0;
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else return data_buf;
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}
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return 0;
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}
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void bt_search(void) {
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unsigned char *buf;
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while ( (buf = hci_poll()) ) {
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if (data_len >= 2) {
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if (buf[0] == LE_ADREPORT_CODE) {
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if (buf[1] == 1) { // num_reports
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if (buf[2] == 0) { // event_type
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int bufindex = 0;
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unsigned char ad_len = buf[11];
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for (int c=9;c>=4;c--) echo_addr[9-c] = buf[bufindex + c]; // save the mac address
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bufindex += 11;
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got_echo_sid = 0; got_echo_name = 0; // Reset the search state machine
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do {
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ad_len = buf[bufindex];
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unsigned char ad_type = buf[bufindex + 1];
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bufindex += 2;
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if (ad_len >= 2) {
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if (ad_type == 0x03) {
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unsigned int sid = buf[bufindex] | (buf[bufindex + 1] << 8);
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if (sid == 0xEC00) {
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got_echo_sid = 1;
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debugstr("got sid... ");
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}
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} else if (ad_type == 0x09) {
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char remote_name[ad_len - 1];
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unsigned int d=0;
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while (d<ad_len - 1) {
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remote_name[d] = buf[bufindex + d];
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d++;
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}
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if (!memcmp(remote_name,"echo",4)) {
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got_echo_name = 1;
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debugstr("got name... ");
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}
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}
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}
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bufindex += ad_len - 1;
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} while (bufindex < data_len);
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}
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}
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}
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}
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}
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}
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void bt_conn()
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{
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unsigned char *buf;
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while ( (buf = hci_poll()) ) {
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if (!connected && data_len >= 2 && buf[0] == LE_CONNECT_CODE) {
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connected = !*(buf+1);
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debughex(connected); debugstr(" ");
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connection_handle = *(buf+2) | (*(buf+3) << 8);
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debughex(connection_handle); debugstr(" ");
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if (connection_handle == 0) wait_msec(0x186A);
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}
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}
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}
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// The screen
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#define WIDTH 1920
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#define HEIGHT 1080
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#define MARGIN 30
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#define VIRTWIDTH (WIDTH-(2*MARGIN))
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#define FONT_BPG 8
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// For the bricks
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#define ROWS 5
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#define COLS 10
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// Gameplay
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#define NUM_LIVES 3
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// OBJECT TRACKING
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struct Object
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{
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unsigned int type;
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unsigned int x;
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unsigned int y;
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unsigned int width;
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unsigned int height;
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unsigned char alive;
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};
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enum {
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OBJ_NONE = 0,
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OBJ_BRICK = 1,
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OBJ_PADDLE = 2,
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OBJ_BALL = 3
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};
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unsigned int numobjs = 0;
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struct Object *objects = (struct Object *)SAFE_ADDRESS;
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struct Object *ball;
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struct Object *paddle;
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const int paddlewidth = 80;
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const int ballradius = 15;
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void removeObject(struct Object *object)
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{
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if (object->type == OBJ_BALL) {
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drawCircle(object->x + ballradius, object->y + ballradius, ballradius, 0, 1);
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} else {
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drawRect(object->x, object->y, object->x + object->width, object->y + object->height, 0, 1);
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}
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object->alive = 0;
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}
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void moveObjectAbs(struct Object *object, int x, int y)
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{
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if (object->type == OBJ_BALL) {
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drawCircle(object->x + ballradius, object->y + ballradius, ballradius, 0, 1);
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drawCircle(x + ballradius, y + ballradius, ballradius, 0x55, 1);
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} else {
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moveRectAbs(object->x, object->y, object->width, object->height, x, y, 0x00);
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}
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object->x = x;
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object->y = y;
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}
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struct Object *detectCollision(struct Object *with, int xoff, int yoff)
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{
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for (int i=0; i<numobjs;i++) {
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if (&objects[i] != with && objects[i].alive == 1) {
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if (with->x + xoff > objects[i].x + objects[i].width || objects[i].x > with->x + xoff + with->width) {
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// with is too far left or right to collide
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} else if (with->y + yoff > objects[i].y + objects[i].height || objects[i].y > with->y + yoff + with->height) {
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// with is too far up or down to collide
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} else {
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// Collision!
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return &objects[i];
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}
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}
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}
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return 0;
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}
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// OBJECT INITIALISERS
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void initBricks()
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{
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int brickwidth = 32;
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int brickheight = 8;
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int brickspacer = 20;
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const int brickcols[] = { 0x11, 0x22, 0xEE, 0x44, 0x66 };
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int ybrick = MARGIN + brickheight;
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for (int i=0; i<ROWS; i++) {
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int xbrick = MARGIN + (VIRTWIDTH/COLS/2) - (brickwidth/2);
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for (int j = 0; j<COLS; j++) {
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drawRect(xbrick, ybrick, xbrick+brickwidth, ybrick+brickheight, brickcols[i], 1);
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objects[numobjs].type = OBJ_BRICK;
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objects[numobjs].x = xbrick;
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objects[numobjs].y = ybrick;
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objects[numobjs].width = brickwidth;
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objects[numobjs].height = brickheight;
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objects[numobjs].alive = 1;
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numobjs++;
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xbrick += (VIRTWIDTH/COLS);
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}
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ybrick = ybrick + brickspacer;
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}
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}
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void initBall()
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{
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drawCircle(WIDTH/2, HEIGHT/2, ballradius, 0x55, 1);
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objects[numobjs].type = OBJ_BALL;
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objects[numobjs].x = (WIDTH/2) - ballradius;
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objects[numobjs].y = (HEIGHT/2) - ballradius;
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objects[numobjs].width = ballradius * 2;
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objects[numobjs].height = ballradius * 2;
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objects[numobjs].alive = 1;
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ball = &objects[numobjs];
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numobjs++;
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}
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void initPaddle()
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{
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int paddleheight = 20;
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int startx = MARGIN + (dir * ((VIRTWIDTH - paddlewidth + MARGIN)/100));
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drawRect(startx, (HEIGHT-MARGIN-paddleheight), startx + paddlewidth, (HEIGHT-MARGIN), 0x11, 1);
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objects[numobjs].type = OBJ_PADDLE;
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objects[numobjs].x = startx;
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objects[numobjs].y = (HEIGHT-MARGIN-paddleheight);
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objects[numobjs].width = paddlewidth;
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objects[numobjs].height = paddleheight;
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objects[numobjs].alive = 1;
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paddle = &objects[numobjs];
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numobjs++;
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}
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void drawScoreboard(int score, int lives)
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{
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char tens = score / 10; score -= (10 * tens);
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char ones = score;
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drawString((WIDTH/2)-252, MARGIN-25, "Score: 0 Lives: ", 0x0f, 3);
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drawChar(tens + 0x30, (WIDTH/2)-252 + (8*8*3), MARGIN-25, 0x0f, 3);
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drawChar(ones + 0x30, (WIDTH/2)-252 + (8*9*3), MARGIN-25, 0x0f, 3);
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drawChar((char)lives + 0x30, (WIDTH/2)-252 + (8*20*3), MARGIN-25, 0x0f, 3);
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}
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void acl_poll()
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{
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while (bt_isReadByteReady()) {
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unsigned char byte = bt_readByte();
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if (byte == HCI_EVENT_PKT) {
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bt_readByte(); // opcode
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unsigned char length = bt_readByte();
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for (int i=0;i<length;i++) bt_readByte();
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} else if (byte == HCI_ACL_PKT) {
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unsigned char h1 = bt_readByte(); // handle1
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unsigned char h2 = bt_readByte(); // handle2
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unsigned char thandle = h1 | (h2 << 8);
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unsigned char d1 = bt_readByte();
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unsigned char d2 = bt_readByte();
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unsigned int dlen = d1 | (d2 << 8);
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unsigned char data[dlen];
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if (dlen > 7) {
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for (int i=0;i<dlen;i++) data[i] = bt_readByte();
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unsigned int length = data[0] | (data[1] << 8);
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unsigned int channel = data[2] | (data[3] << 8);
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unsigned char opcode = data[4];
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if (thandle == connection_handle && length == 4 && opcode == 0x1b) {
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if (channel == 4 && data[5] == 0x2a && data[6] == 0x00) {
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dir = data[7];
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moveObjectAbs(paddle, MARGIN + (dir * ((VIRTWIDTH - paddlewidth + MARGIN)/100)), paddle->y);
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}
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}
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}
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}
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}
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}
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void breakout()
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{
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struct Object *foundObject;
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int bricks = ROWS * COLS;
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int lives = NUM_LIVES;
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int points = 0;
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int velocity_x = 1;
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int velocity_y = 3;
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initBricks();
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initBall();
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initPaddle();
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drawScoreboard(points, lives);
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while (lives > 0 && bricks > 0) {
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acl_poll();
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// Are we going to hit anything?
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foundObject = detectCollision(ball, velocity_x, velocity_y);
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if (foundObject) {
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if (foundObject == paddle) {
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velocity_y = -velocity_y;
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// Are we going to hit the side of the paddle
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if (ball->x + ball->width + velocity_x == paddle->x || ball->x + velocity_x == paddle->x + paddle->width) velocity_x = -velocity_x;
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} else if (foundObject->type == OBJ_BRICK) {
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removeObject(foundObject);
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velocity_y = -velocity_y;
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bricks--;
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points++;
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drawScoreboard(points, lives);
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}
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}
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wait_msec(0x186A);
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moveObjectAbs(ball, ball->x + velocity_x, ball->y + velocity_y);
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// Check we're in the game arena still
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if (ball->x + ball->width >= WIDTH-MARGIN) {
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velocity_x = -velocity_x;
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} else if (ball->x <= MARGIN) {
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velocity_x = -velocity_x;
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} else if (ball->y + ball->height >= HEIGHT-MARGIN) {
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lives--;
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removeObject(ball);
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removeObject(paddle);
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drawScoreboard(points, lives);
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if (lives) {
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initBall();
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initPaddle();
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}
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} else if (ball->y <= MARGIN) {
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velocity_y = -velocity_y;
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}
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}
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int zoom = WIDTH/192;
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int strwidth = 10 * FONT_BPG * zoom;
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int strheight = FONT_BPG * zoom;
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if (bricks == 0) drawString((WIDTH/2)-(strwidth/2), (HEIGHT/2)-(strheight/2), "Well done!", 0x02, zoom);
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else drawString((WIDTH/2)-(strwidth/2), (HEIGHT/2)-(strheight/2), "Game over!", 0x04, zoom);
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wait_msec(0x500000); // Wait 5 seconds
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drawRect((WIDTH/2)-(strwidth/2), (HEIGHT/2)-(strheight/2), (WIDTH/2)+(strwidth/2), (HEIGHT/2)+(strheight/2), 0, 1);
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numobjs = 0;
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}
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void main()
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{
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fb_init();
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uart_init();
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bt_init();
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debugstr("Initialising Bluetooth: ");
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debugstr(">> reset: ");
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bt_reset();
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debugstr(">> firmware load: ");
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bt_loadfirmware();
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debugstr(">> set baud: ");
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bt_setbaud();
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debugstr(">> set bdaddr: ");
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bt_setbdaddr();
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// Print the BD_ADDR
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unsigned char local_addr[6];
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bt_getbdaddr(local_addr);
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for (int c=5;c>=0;c--) debugch(local_addr[c]);
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debugcrlf();
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// Start scanning
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debugstr("Setting event mask... ");
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setLEeventmask(0xff);
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debugstr("Starting scanning... ");
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startActiveScanning();
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// Search for the echo
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debugstr("Waiting...");
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debugcrlf();
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while (!(got_echo_sid && got_echo_name)) bt_search();
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stopScanning();
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for (int c=0;c<=5;c++) debugch(echo_addr[c]);
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debugcrlf();
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// Connecting to echo
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debugstr("Connecting to echo: ");
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connect(echo_addr);
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while (!(connected && connection_handle)) bt_conn();
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debugstr("Connected!");
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debugcrlf();
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// Subscribe to updates
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debugstr("Sending read request: ");
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debughex(connection_handle); debugcrlf();
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sendACLsubscribe(connection_handle);
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// Begin the game
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debugstr("Let the game commence...\n");
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wait_msec(0x100000); // Wait a second
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while (1) breakout();
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}
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