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spi: return int instead of uint8_t in mraa_spi_write

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This stops the error code getting lost since -1 wraps around to 0xFF when cast
to a uint8_t. This fixes #146

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2015-03-03 16:20:29 +00:00
parent 7375146295
commit f854a2b410
3 changed files with 7 additions and 7 deletions
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6
src/spi/spi.c
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@@ -234,7 +234,7 @@ mraa_spi_bit_per_word(mraa_spi_context dev, unsigned int bits)
return MRAA_SUCCESS;
}
uint8_t
int
mraa_spi_write(mraa_spi_context dev, uint8_t data)
{
struct spi_ioc_transfer msg;
@@ -242,7 +242,7 @@ mraa_spi_write(mraa_spi_context dev, uint8_t data)
uint16_t length = 1;
uint8_t recv = 0;
unsigned long recv = 0;
msg.tx_buf = (unsigned long) &data;
msg.rx_buf = (unsigned long) &recv;
msg.speed_hz = dev->clock;
@@ -253,7 +253,7 @@ mraa_spi_write(mraa_spi_context dev, uint8_t data)
syslog(LOG_ERR, "spi: Failed to perform dev transfer");
return -1;
}
return recv;
return (int) recv;
}
uint16_t