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nrf: i2sout: Fix double-increment when copying samples

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This caused two problems when playing unsigned samples:
 * When an even number of samples were present, it "worked" but only
   every other sample was copied into the output, changing the waveform
 * When an odd number of samples were present, the copy continued beyond
   the end of the buffers and caused a hard fault
This commit is contained in:
Jeff Epler 2019-11-25 09:07:20 -06:00
parent c000567d88
commit 19d122e546
1 changed files with 2 additions and 2 deletions
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4
ports/nrf/common-hal/audiobusio/I2SOut.c
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@ -139,14 +139,14 @@ static void i2s_buffer_fill(audiobusio_i2sout_obj_t* self) {
uint16_t *bp = (uint16_t*)buffer;
uint16_t *be = (uint16_t*)(buffer + bytecount);
uint16_t *sp = (uint16_t*)self->sample_data;
for (; bp != be; bp++) {
for (; bp != be;) {
*bp++ = *sp++ + 0x8000;
}
} else {
uint8_t *bp = (uint8_t*)buffer;
uint8_t *be = (uint8_t*)(buffer + bytecount);
uint8_t *sp = (uint8_t*)self->sample_data;
for (; bp != be; bp++) {
for (; bp != be;) {
*bp++ = *sp++ + 0x80;
}
}