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stm32f4: Add for-loop guard for transmit_packet xfers < 4 chars.

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This commit is contained in:
William D. Jones 2019-02-07 21:25:27 -05:00
parent 28ccc8bd0b
commit 5645d44127
1 changed files with 9 additions and 3 deletions
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12
src/portable/stm/stm32f4/dcd_stm32f4.c
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@ -428,9 +428,15 @@ static void transmit_packet(xfer_ctl_t * xfer, USB_OTG_INEndpointTypeDef * in_ep
// Buffer might not be aligned to 32b, so we need to force alignment
// by copying to a temp var.
uint8_t * base = (xfer->buffer + xfer->queued_len);
for(uint16_t i = 0; i < to_xfer_size_aligned; i += 4) {
uint32_t tmp = base[i] | (base[i + 1] << 8) | (base[i + 2] << 16) | (base[i + 3] << 24);
(* tx_fifo) = tmp;
// This for loop always runs at least once- skip if less than 4 bytes
// to send off.
if(to_xfer_size >= 4) {
for(uint16_t i = 0; i < to_xfer_size_aligned; i += 4) {
uint32_t tmp = base[i] | (base[i + 1] << 8) | \
(base[i + 2] << 16) | (base[i + 3] << 24);
(* tx_fifo) = tmp;
}
}
// Do not read beyond end of buffer if not divisible by 4.