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TX sample generation loop that outputs an eight-sample sine wave. (1.25MHz assuming 10MHz codec clock.)

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This commit is contained in:
Jared Boone
2012-06-15 16:20:46 -07:00
parent bab6ec5fef
commit 72e3dc1e21
1 changed files with 17 additions and 2 deletions
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15
firmware/sgpio/sgpio.c
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@ -194,8 +194,23 @@ void configure_sgpio_test_tx() {
(1L << SGPIO_SLICE_A) (1L << SGPIO_SLICE_A)
; ;
// LSB goes out first, samples are 0x<Q1><I1><Q0><I0>
volatile uint32_t buffer[] = {
0xda808080,
0xda80ff80,
0x26808080,
0x26800180,
};
uint32_t i = 0;
// Enable codec data stream. // Enable codec data stream.
SGPIO_GPIO_OUTREG &= ~(1L << 10); SGPIO_GPIO_OUTREG &= ~(1L << 10);
while(true) {
while(SGPIO_STATUS_1 == 0);
SGPIO_REG_SS(SGPIO_SLICE_A) = buffer[(i++) & 3];
SGPIO_CLR_STATUS_1 = 1;
}
} }
void configure_sgpio_test_rx() { void configure_sgpio_test_rx() {