add:spi device cs可选

luat/weak/luat_spi_device.c

@@ -10,7 +10,8 @@
 // luat_spi_device_t* 在lua层看到的是一个userdata
 LUAT_WEAK int luat_spi_device_setup(luat_spi_device_t* spi_dev) {
     luat_spi_bus_setup(spi_dev);
-    luat_gpio_mode(spi_dev->spi_config.cs, Luat_GPIO_OUTPUT, Luat_GPIO_DEFAULT, Luat_GPIO_HIGH); // CS
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_mode(spi_dev->spi_config.cs, Luat_GPIO_OUTPUT, Luat_GPIO_DEFAULT, Luat_GPIO_HIGH); // CS
     return 0;
 }
 
@@ -22,29 +23,33 @@ LUAT_WEAK int luat_spi_device_close(luat_spi_device_t* spi_dev) {
 //收发SPI数据，返回接收字节数
 LUAT_WEAK int luat_spi_device_transfer(luat_spi_device_t* spi_dev, const char* send_buf, size_t send_length, char* recv_buf, size_t recv_length) {
     luat_spi_device_config(spi_dev);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
     int ret = luat_spi_transfer(spi_dev->bus_id, send_buf, send_length, recv_buf, recv_length);
-    // int ret = luat_spi_send(spi_dev->bus_id, send_buf, send_length);
-    // ret = luat_spi_recv(spi_dev->bus_id, recv_buf, recv_length);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
     return ret;
 }
 
 //收SPI数据，返回接收字节数
 LUAT_WEAK int luat_spi_device_recv(luat_spi_device_t* spi_dev, char* recv_buf, size_t length) {
     luat_spi_device_config(spi_dev);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
     int ret = luat_spi_recv(spi_dev->bus_id, recv_buf, length);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
     return ret;
 }
 
 //发SPI数据，返回发送字节数
 LUAT_WEAK int luat_spi_device_send(luat_spi_device_t* spi_dev, const char* send_buf, size_t length) {
     luat_spi_device_config(spi_dev);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_SELECT);
     int ret = luat_spi_send(spi_dev->bus_id, send_buf, length);
-    luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
+    if (spi_dev->spi_config.cs != 255)
+        luat_gpio_set(spi_dev->spi_config.cs, LUAT_SPI_CS_CLEAR);
     return ret;
 }