adafruit-mirror/Adafruit_Blinka_Raspberry_Pi5_Piomatter
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restore large xfer workaround

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This commit is contained in:
Jeff Epler 2025-03-17 10:29:45 -05:00
parent 100c96d87e
commit e8e07106be
1 changed files with 30 additions and 2 deletions
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32
src/include/piomatter/piomatter.h
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@ -12,6 +12,34 @@
namespace piomatter {
static int pio_sm_xfer_data_large(PIO pio, int sm, int direction, size_t size,
uint32_t *databuf) {
int r = pio_sm_xfer_data(pio, sm, direction, size, databuf);
if (r != -EPERM) {
// Kernels that don't support large transfers return EPERM
return r;
}
static bool once = false;
if (!once) {
once = true;
fprintf(stderr,
"Transmission limit workaround engaged. May reduce quality of "
"output.\nSee https://github.com/raspberrypi/utils/issues/123 "
"for details.");
}
constexpr size_t MAX_XFER = 65532;
while (size) {
size_t xfersize = std::min(size_t{MAX_XFER}, size);
r = pio_sm_xfer_data(pio, sm, direction, xfersize, databuf);
if (r) {
return r;
}
size -= xfersize;
databuf += xfersize / sizeof(*databuf);
}
return 0;
}
static uint64_t monotonicns64() {
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
@ -181,8 +209,8 @@ struct piomatter : piomatter_base {
auto dataptr = const_cast<uint32_t *>(&data[0]);
// returns err = rp1_ioctl.... which seems to be a negative
// errno value
int r =
pio_sm_xfer_data(pio, sm, PIO_DIR_TO_SM, datasize, dataptr);
int r = pio_sm_xfer_data_large(pio, sm, PIO_DIR_TO_SM, datasize,
dataptr);
if (r != 0) {
pending_error_errno.store(-r);
printf("xfer_data() returned error %d (%s)\n", r,