init

spi_utils.c

@@ -0,0 +1,43 @@
+#include "spi_utils.h"
+
+int init_device(const char* device,
+                uint8_t spi_mode,
+                uint8_t spi_bits,
+                uint32_t spi_speed) {
+    int fd;
+
+    if ((fd = open(device, O_RDWR)) < 0) {
+        perror("SPI 设备打开失败");
+        close(fd);
+        return -1;
+    }
+
+    ioctl(fd, SPI_IOC_WR_MODE, &spi_mode);
+    ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &spi_bits);
+    ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &spi_speed);
+
+    return fd;
+}
+
+int send_buffer(int fd,
+                uint8_t* buffer,
+                const int data_size,
+                uint32_t spi_speed,
+                uint8_t spi_bits) {
+    int ret;
+
+    struct spi_ioc_transfer tr = {
+        .tx_buf = (unsigned long)buffer,
+        .len = data_size,
+        .speed_hz = spi_speed,
+        .bits_per_word = spi_bits,
+    };
+
+    ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
+
+    if (ret < 0) {
+        perror("SPI 信息发送失败");
+    }
+
+    return ret;
+}