diff --git a/source/spi_dev/spi4test b/source/spi_dev/spi4test
index dc45c6a..3495e9b 100755
Binary files a/source/spi_dev/spi4test and b/source/spi_dev/spi4test differ
diff --git a/source/spi_dev/spi4test.c b/source/spi_dev/spi4test.c
index 04ad170..16f18a4 100755
--- a/source/spi_dev/spi4test.c
+++ b/source/spi_dev/spi4test.c
@@ -27,14 +27,21 @@
 
 /* ========== SPI配置（必须与MCU主设备完全一致）========== */
 #define SPI_DEVICE      "/dev/spidev4.0"
-#define SPI_MODE        SPI_MODE_0      /* CPOL=1, CPHA=1 */
+#define SPI_MODE        SPI_MODE_2      /* CPOL=1, CPHA=1 */
 #define SPI_BITS        8
 #define SPI_SPEED       1000000         /* 1MHz */
-#define FRAME_LEN       128              /* 每帧64字节 */
+#define FRAME_LEN       128              /* 每帧256字节 */
 /* ===================================================== */
 
 static volatile int keep_running = 1;
 
+static int is_all_zero(const uint8_t *buf, int len) {
+    for (int i = 0; i < len; i++)
+        if (buf[i] != 0)
+            return 0;
+    return 1;
+}
+
 void sigint_handler(int sig) {
     (void)sig;
     keep_running = 0;
@@ -43,7 +50,13 @@ void sigint_handler(int sig) {
 
 int main(void)
 {
-    uint8_t buf[FRAME_LEN];
+    uint8_t rx_buf[FRAME_LEN];
+    uint8_t tx_buf[FRAME_LEN] = {0xAA, 0xBB, 0xCC, 0xDD};
+    tx_buf[FRAME_LEN-4] = 0x11;
+    tx_buf[FRAME_LEN-3] = 0x22;
+    tx_buf[FRAME_LEN-2] = 0x33;
+    tx_buf[FRAME_LEN-1] = 0x44;
+
     int fd, ret;
     unsigned int frame_count = 0;
 
@@ -105,32 +118,44 @@ int main(void)
 
     /* 6. 循环接收数据 */
     while (keep_running) {
-        memset(buf, 0, FRAME_LEN);
-        ret = read(fd, buf, FRAME_LEN);
+        memset(rx_buf, 0, FRAME_LEN);
+
+        struct spi_ioc_transfer tr = {
+            .tx_buf        = (unsigned long)tx_buf,
+            .rx_buf        = (unsigned long)rx_buf,
+            .len           = FRAME_LEN,
+            .speed_hz      = SPI_SPEED,
+            .bits_per_word = SPI_BITS,
+        };
+        ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
         if (ret < 0) {
-            perror("read");
+            perror("spi transfer");
             break;
-        } else if (ret == 0) {
-            /* 非阻塞模式可能返回0，但这里用了阻塞模式，一般不会出现 */
-            //continue;
         }
+        ret = FRAME_LEN;  /* transfer 成功则返回 FRAME_LEN */
 
         frame_count++;
+
+        /* 只有 tx 或 rx 数据不全为零时才打印 */
+        if (is_all_zero(tx_buf, FRAME_LEN) && is_all_zero(rx_buf, FRAME_LEN))
+            continue;
+
         printf("\n========== Frame #%u (%d bytes) ==========\n", frame_count, ret);
-        printf("HEX  : ");
-        for (int i = 0; i < ret; i++)
-            printf("0x%02X ", buf[i]);
-        printf("\n");
 
-        printf("ASCII: ");
-        for (int i = 0; i < ret; i++)
-            printf(" %c  ", (buf[i] >= 0x20 && buf[i] < 0x7F) ? buf[i] : '.');
-        printf("\n");
+        if (!is_all_zero(tx_buf, FRAME_LEN)) {
+            printf("TX HEX: ");
+            for (int i = 0; i < ret; i++)
+                printf("0x%02X ", tx_buf[i]);
+            printf("\n");
+        }
+
+        if (!is_all_zero(rx_buf, FRAME_LEN)) {
+            printf("RX HEX: ");
+            for (int i = 0; i < ret; i++)
+                printf("0x%02X ", rx_buf[i]);
+            printf("\n");
+        }
 
-        printf("DEC  : ");
-        for (int i = 0; i < ret; i++)
-            printf("%3d ", buf[i]);
-        printf("\n");
         printf("=========================================\n");
     }