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stm32f4: spi_transfer_bytes fix sign-compare, reduce scope

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This commit is contained in:
Joakim Gebart 2015-05-27 21:44:33 +02:00
parent 13bdc21c9e
commit 18ea5561f8
1 changed files with 6 additions and 3 deletions
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9
cpu/stm32f4/periph/spi.c
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@ -352,20 +352,23 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
int spi_transfer_bytes(spi_t dev, char *out, char *in, unsigned int length)
{
int trans_bytes = 0;
int i, trans_ret, trans_bytes = 0;
char in_temp;
for (unsigned int i = 0; i < length; i++) {
char in_temp;
int trans_ret;
for (i = 0; i < length; i++) {
if (out) {
trans_ret = spi_transfer_byte(dev, out[i], &in_temp);
}
else {
trans_ret = spi_transfer_byte(dev, 0, &in_temp);
}
if (trans_ret < 0) {
return -1;
}
if (in != NULL) {
in[i] = in_temp;
}