初始化提交

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

@@ -0,0 +1,66 @@
+#include "spi.h"
+#include <pthread.h>
+#include <unistd.h>
+#include <stdexcept>
+
+static pthread_mutex_t spiMutex = PTHREAD_MUTEX_INITIALIZER;
+bool bcmIsInitialized = false;
+
+SPI::SPI()
+{
+
+}
+
+void SPI::begin(int busNo, uint32_t spi_speed)
+{
+    if (!bcmIsInitialized) {
+        if (!bcm2835_init()) {
+            return;
+        }
+    }
+    bcmIsInitialized = true;
+    bcm2835_spi_begin();
+}
+
+void SPI::beginTransaction(SPISettings settings)
+{
+    if (geteuid() != 0) {
+        throw std::runtime_error("Process should run as root");
+    }
+    pthread_mutex_lock(&spiMutex);
+    setBitOrder(settings.border);
+    setDataMode(settings.dmode);
+    setClockDivider(settings.clck);
+}
+
+void SPI::endTransaction()
+{
+    pthread_mutex_unlock(&spiMutex);
+}
+
+void SPI::setBitOrder(uint8_t bit_order)
+{
+    bcm2835_spi_setBitOrder(bit_order);
+}
+
+void SPI::setDataMode(uint8_t data_mode)
+{
+    bcm2835_spi_setDataMode(data_mode);
+}
+
+void SPI::setClockDivider(uint32_t spi_speed)
+{
+    //bcm2835_spi_setClockDivider(spi_speed);
+    bcm2835_spi_set_speed_hz(spi_speed);
+}
+
+void SPI::chipSelect(int csn_pin)
+{
+    bcm2835_spi_chipSelect(csn_pin);
+    delayMicroseconds(5);
+}
+
+SPI::~SPI()
+{
+
+}