108 lines
1.7 KiB
C
108 lines
1.7 KiB
C
#include "sys.h"
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void init() {
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square0->output_address = pdmout0;
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square0->high_val = 0xafff;
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square0->low_val = 0x0000;
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square0->flags = SQUARE_FLAG_ENABLE_msk;
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// will set the period later
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}
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int strlen(const char* str) {
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int i = 0;
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while(str[i] != '\0') {
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i++;
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}
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return i;
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}
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void log(const char* stuff) {
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uart_writen(uart0, stuff, strlen(stuff));
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}
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void dump(uint8_t a) {
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uint8_t hi = a >> 4;
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uint8_t lo = a & 0xf;
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const char* letters = "0123456789abcdef";
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uart_write(uart0, letters[hi]);
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uart_write(uart0, letters[lo]);
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}
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#define midi_uart uart1
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#define MODE_IDLE 0
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#define MODE_DOWN 1
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#define MODE_UP 2
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int main() {
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const int periods[] = {
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1493,
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0,
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1330,
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0,
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1185,
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1119,
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0,
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996,
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0,
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887,
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0,
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791,
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};
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init();
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led0->output = 42;
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int keydown = 0;
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int mode = MODE_IDLE;
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while(1) {
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uint8_t c = uart_read(midi_uart);
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if (c == 0xfe) {
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// nothing
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} else if (c == 0x90) {
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mode = MODE_DOWN;
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} else if (c == 0x80) {
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mode = MODE_UP;
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} else if ((c & 0x80) == 0) {
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if (mode == MODE_DOWN) {
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int period = 0;
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keydown = c;
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log("dn ");
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dump(c);
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log("\r\n");
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if (c > 0x3b) {
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if (c < 0x48) {
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period = periods[c - 0x3c];
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}
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}
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uart_read(midi_uart);
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square0->period = period;
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} else if (mode == MODE_UP) {
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log("up ");
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dump(c);
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log("\r\n");
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uart_read(midi_uart);
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if (keydown == c) {
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square0->period = 0;
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}
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}
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} else {
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log("weird: ");
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dump(c);
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log("\r\n");
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}
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}
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}
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