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arduino-cli/libraries/RF24/utility/wiringPi/spi.cpp

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+/*
+ * File:   spi.cpp
+ * Author:
+ *
+ * Created on
+ *
+ * Inspired from spi speed test from wiringPi
+ * wiringPi/examples/spiSpeed.c
+ */
+
+#include "spi.h"
+
+#include <wiringPi.h>
+#include <wiringPiSPI.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#define RF24_SPI_CHANNEL    0
+
+SPI::SPI():fd(-1)
+{
+    printf("wiringPi RF24 DRIVER\n");
+}
+
+void SPI::begin(int csn_pin, uint32_t spi_speed)
+{
+    // initialize the wiringPiSPI
+    if ((this->fd = wiringPiSPISetup(RF24_SPI_CHANNEL, spi_speed)) < 0) {
+        printf("Cannot configure the SPI device!\n");
+        fflush(stdout);
+        abort();
+    } else {
+        printf("Configured SPI fd: %d - pin: %d\n", fd, csn_pin);
+    }
+}
+
+uint8_t SPI::transfer(uint8_t tx)
+{
+    memset(&msgByte, 0, sizeof(msgByte));
+    memcpy(&msgByte, &tx, sizeof(tx));
+
+    if (wiringPiSPIDataRW(RF24_SPI_CHANNEL, &msgByte, sizeof(tx)) < 0) {
+        printf("transfer(): Cannot send data: %s\n", strerror(errno));
+        fflush(stdout);
+        abort();
+    }
+
+    return msgByte;
+}
+
+void SPI::transfern(char* buf, uint32_t len)
+{
+    printf("transfern(tx: %s)\n", buf);
+
+    if (wiringPiSPIDataRW(RF24_SPI_CHANNEL, (uint8_t*) buf, len) < 0) {
+        printf("transfern(): Cannot send data %s\n", strerror(errno));
+        fflush(stdout);
+        abort();
+    }
+}
+
+void SPI::transfernb(char* tbuf, char* rbuf, uint32_t len)
+{
+    // using an auxiliary buffer to keep tx and rx different
+    memset(msg, 0, sizeof(msg));
+    memcpy(msg, tbuf, len);
+
+    if (wiringPiSPIDataRW(RF24_SPI_CHANNEL, msg, len) < 0) {
+        printf("transfernb() Cannot send data %s\n", strerror(errno));
+        fflush(stdout);
+        abort();
+    }
+
+    memcpy(rbuf, msg, len);
+}
+
+SPI::~SPI()
+{
+    if (this->fd >= 0) {
+        close(this->fd);
+        this->fd = -1;
+    }
+}