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Update spi.cpp #3

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Update spi.cpp #3

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7 changes: 5 additions & 2 deletions src/spi.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
*/

#include "spi.h"
#include <string.h>

// Constructor
// Opens the SPI device and sets up some default values
Expand Down Expand Up @@ -97,13 +98,15 @@ uint16_t SPI::getDelayUsecs() {
// Transfer some data
bool SPI::transfer(uint8_t *tx, uint8_t *rx, int length) {
struct spi_ioc_transfer tr;


memset(&tr,0,sizeof(tr));
tr.tx_buf = (unsigned long)tx; //tx and rx MUST be the same length!
tr.rx_buf = (unsigned long)rx;
tr.len = length;
tr.delay_usecs = this->delay;
tr.speed_hz = this->speed;
tr.bits_per_word = this->bits;
tr.cs_change = 0;

int ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
if (ret == 1) {
Expand All @@ -116,4 +119,4 @@ bool SPI::transfer(uint8_t *tx, uint8_t *rx, int length) {
// Close the bus
void SPI::close() {
::close(this->fd);
}
}