43 lines
1.1 KiB
C
43 lines
1.1 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 = 0xffff;
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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 main() {
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init();
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while(1) {
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uint8_t c = uart_read(uart0);
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uint16_t period;
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if (c == 'c') {
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period = 1493; // C4, 262.63 Hz, maybe
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uart_writen(uart0, "C4\r\n", 4);
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} else if (c == 'd') {
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period = 1330; // D4, 293.66 Hz, maybe
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uart_writen(uart0, "D4\r\n", 4);
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} else if (c == 'e') {
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period = 1185; // E4, 329.63 Hz, maybe
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uart_writen(uart0, "E4\r\n", 4);
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} else if (c == 'f') {
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period = 1119; // F4, 249.23 Hz, maybe
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uart_writen(uart0, "F4\r\n", 4);
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} else if (c == 'g') {
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period = 996; // G4, 392.00 Hz, maybe
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uart_writen(uart0, "G4\r\n", 4);
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} else if (c == 'a') {
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period = 887; // A4, 440.00 Hz, maybe
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uart_writen(uart0, "A4\r\n", 4);
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} else if (c == 'b') {
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period = 791; // B4, 493.88 Hz, maybe
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uart_writen(uart0, "B4\r\n", 4);
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}
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square0->period = period;
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}
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}
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