[arduino] add comment (#6016)

bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/pins_arduino.c

@@ -46,6 +46,10 @@ const pin_map_t pin_map_table[]=
     {D23, GET_PIN(E,9), "pwm1", 1}, /* PWM, BSP: BLUE-LED */
     {D24, GET_PIN(B,0)}, /* INFRARED EMISSION */
     {D25, GET_PIN(B,1)}, /* INFRARED RECEPTION */
+    {D26, GET_PIN(D,7)}, /* LCD CS */
+    {D27, GET_PIN(B,6)}, /* LCD RESET */
+    {D28, GET_PIN(B,4)}, /* LCD DC (data or command) */
+    {D29, GET_PIN(B,7)}, /* LCD POWER */
     {A0, GET_PIN(C,2), "adc1", 3}, /* ADC */
     {A1, GET_PIN(C,4), "adc1", 13}, /* ADC */
     {A2, RT_NULL, "adc1", 0}, /* ADC, On-Chip: internal reference voltage, ADC_CHANNEL_VREFINT */

bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/pins_arduino.h

@@ -38,22 +38,32 @@
 #define D23  (23)
 #define D24  (24)
 #define D25  (25)
-#define A0   (26)
-#define A1   (27)
-#define A2   (28)
-#define A3   (29)
-#define DAC0 (30)
+#define D26  (26)
+#define D27  (27)
+#define D28  (28)
+#define D29  (29)
+#define A0   (30)
+#define A1   (31)
+#define A2   (32)
+#define A3   (33)
+#define DAC0 (34)
 
 #define F_CPU  80000000L /* CPU: 80MHz */
 #define LED_BUILTIN  D22 /* Default Built-in LED */
 
 /*
- * i2c1 - PC7-SDA PC6-SCL(User I2C)
+ * i2c1 - PC7-SDA PC6-SCL (User I2C)
  * i2c3 - ICM20608, AP3216C (On Board)
  * i2c4 - AHT10 (On Board)
  */
 #define RTDUINO_DEFAULT_IIC_BUS_NAME            "i2c4"
+
+/*
+ * spi2 - Wireless Interface (User SPI)
+ * spi3 - LCD ST7789
+ */
 #define RTDUINO_DEFAULT_SPI_BUS_NAME            "spi2"
+
 #define RTDUINO_DEFAULT_HWTIMER_DEVICE_NAME     "timer7"
 #define RTDUINO_SERIAL2_DEVICE_NAME             "uart2"
 

bsp/stm32/stm32l475-atk-pandora/board/Kconfig

@@ -39,18 +39,21 @@ menu "Onboard Peripheral Drivers"
         select BSP_USING_ADC
         select BSP_USING_ADC1
         select BSP_USING_I2C
-        select BSP_USING_I2C1
-        select BSP_USING_I2C3
-        select BSP_USING_I2C4
+        select BSP_USING_I2C1 # PC7-SDA PC6-SCL (User I2C)
+        select BSP_USING_I2C3 # ICM20608, AP3216C (On Board)
+        select BSP_USING_I2C4 # AHT10 (On Board)
         select BSP_USING_DAC
         select BSP_USING_DAC1
         select BSP_USING_SPI
-        select BSP_USING_SPI2
+        select BSP_USING_SPI2 # Wireless Interface (User SPI)
         imply BSP_SPI2_TX_USING_DMA
         imply BSP_SPI2_RX_USING_DMA
+        select BSP_USING_SPI3 # LCD ST7789
+        select BSP_SPI3_TX_USING_DMA
         imply RTDUINO_USING_SERVO
         imply RTDUINO_USING_WIRE
         imply RTDUINO_USING_SPI
+        imply RTDUINO_USING_USBSERIAL
         imply RTDUINO_USING_ADAFRUIT
         imply RTDUINO_USING_MSTIMER2
         default n

bsp/stm32/stm32l475-atk-pandora/board/ports/lcd/drv_lcd.c

@@ -40,7 +40,7 @@ static int rt_hw_lcd_config(void)
 
     /* config spi */
     {
-        struct rt_spi_configuration cfg;
+        struct rt_spi_configuration cfg = {0};
         cfg.data_width = 8;
         cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
         cfg.max_hz = 42 * 1000 * 1000; /* 42M,SPI max 42MHz,lcd 4-wire spi */

components/drivers/include/drivers/adc.h

@@ -20,7 +20,7 @@ struct rt_adc_ops
     rt_err_t (*enabled)(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled);
     rt_err_t (*convert)(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value);
     rt_uint8_t (*get_resolution)(struct rt_adc_device *device);
-    rt_int16_t (*get_vref) (const struct rt_adc_device *device);
+    rt_int16_t (*get_vref) (struct rt_adc_device *device);
 };
 
 struct rt_adc_device

components/drivers/include/drivers/rt_drv_pwm.h

@@ -23,7 +23,7 @@
 
 struct rt_pwm_configuration
 {
-    rt_uint32_t channel; /* 0-n */
+    rt_uint32_t channel; /* 1-n or 0-n, which depends on specific MCU requirements */
     rt_uint32_t period;  /* unit:ns 1ns~4.29s:1Ghz~0.23hz */
     rt_uint32_t pulse;   /* unit:ns (pulse<=period) */