working C button 'presser'
[megadrive.git] / main.c
CommitLineData
0c1e003e 1#include <stdint.h>
2#include <stdio.h>
3#include <string.h>
4#include "teensy3/core_pins.h"
5#include "teensy3/usb_seremu.h"
6#include "teensy3/usb_rawhid.h"
7
9c4f55f4 8/* ?0SA 00DU, ?1CB RLDU */
9static uint8_t fixed_state[4] = { 0x33, 0x3f };
10
0c1e003e 11ssize_t _write(int fd, const void *buf, size_t nbyte)
12{
13 char tbuf[64];
14 int ret;
15
16 if (fd != 1 && fd != 2) {
17 snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd);
18 usb_seremu_write(tbuf, strlen(tbuf));
19 }
20
21 ret = usb_seremu_write(buf, nbyte);
22 return ret < 0 ? ret : nbyte;
23}
24
25void yield(void)
26{
27}
28
9c4f55f4 29static void pin0_irq(void)
30{
31}
32
33void portb_isr(void)
34{
35 uint32_t isfr;
36
37 //printf("irq, GPIOB_PDIR: %08x\n", GPIOB_PDIR);
38
39 GPIOD_PDOR = fixed_state[(GPIOB_PDIR >> CORE_PIN0_BIT) & 1];
40
41 isfr = PORTB_ISFR;
42 PORTB_ISFR = isfr;
43}
44
0c1e003e 45int main(void)
46{
9c4f55f4 47 //int ret;
0c1e003e 48
49 delay(1000); // wait for usb..
50
51 printf("starting, rawhid: %d\n", usb_rawhid_available());
52
9c4f55f4 53 // md pin th tr tl r l d u
54 // md bit* 6 5 4 3 2 1 0
55 // t bit b16 d5 d4 d3 d2 d1 d0
56 // t pin 0 20 6 8 7 14 2
57 // * - note: tl/tr mixed in most docs
58 pinMode(0, INPUT);
59 attachInterrupt(0, pin0_irq, CHANGE);
60
61 pinMode( 2, OUTPUT);
62 pinMode(14, OUTPUT);
63 pinMode( 7, OUTPUT);
64 pinMode( 8, OUTPUT);
65 pinMode( 6, OUTPUT);
66 pinMode(20, OUTPUT);
67
68 // led
69 pinMode(13, OUTPUT);
70 // CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
71 // CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
72
73 // CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16
74 printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR);
75 printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR);
76 printf("PORTB_PCR16: %08x\n", PORTB_PCR16);
77
0c1e003e 78 // ret = usb_rawhid_recv(buf, 2000);
79 // ret = usb_rawhid_send(buf, 2000);
80
0c1e003e 81 while (1) {
9c4f55f4 82 delay(4000);
83 fixed_state[1] &= ~0x20;
0c1e003e 84 CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
9c4f55f4 85
86 delay(700);
87 fixed_state[1] |= 0x20;
0c1e003e 88 CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
0c1e003e 89 }
90}