[bsp][raspberry-pico]add uart1 support.

bsp/raspberry-pico/README.md

@@ -64,14 +64,14 @@ msh >
 
 ## Peripheral Condition
 
-| Drive | Support | Remark |
-| ----- | ------- | ------ |
-| UART  | Support | UART0  |
-| GPIO  | Support | 0-29   |
-| I2C   | -       | -      |
-| RTC   | -       | -      |
-| SDIO  | -       | -      |
-| SPI   | -       | -      |
-| TIMER | -       | -      |
-| WDT   | -       | -      |
+| Drive | Support | Remark  |
+| ----- | ------- | ------- |
+| UART  | Support | UART0/1 |
+| GPIO  | Support | 0-29    |
+| I2C   | -       | -       |
+| RTC   | -       | -       |
+| SDIO  | -       | -       |
+| SPI   | -       | -       |
+| TIMER | -       | -       |
+| WDT   | -       | -       |
 

bsp/raspberry-pico/drivers/drv_uart.c

@@ -153,3 +153,130 @@ int rt_hw_uart_init(void)
     return ret;
 }
 // INIT_DEVICE_EXPORT(rt_hw_uart_init);
+
+// We are using pins 0 and 1, but see the GPIO function select table in the
+// datasheet for information on which other pins can be used.
+#define UART1_TX_PIN 4
+#define UART1_RX_PIN 5
+
+static struct pico_uart1_dev uart1_dev;
+
+struct pico_uart1_dev
+{
+    struct rt_serial_device parent;
+    rt_uint32_t uart_periph;
+    rt_uint32_t irqno;
+};
+
+void pico_uart1_isr(void)
+{
+    rt_interrupt_enter();
+    /* read interrupt status and clear it */
+    if (uart_is_readable(uart1)) /* rx ind */
+    {
+        rt_hw_serial_isr(&uart1_dev.parent, RT_SERIAL_EVENT_RX_IND);
+    }
+
+    rt_interrupt_leave();
+}
+
+/*
+ * UART interface
+ */
+static rt_err_t pico_uart1_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
+{
+    return RT_EOK;
+}
+
+static rt_err_t pico_uart1_control(struct rt_serial_device *serial, int cmd, void *arg)
+{
+    switch (cmd)
+    {
+    /* enable interrupt */
+    case RT_DEVICE_CTRL_SET_INT:
+        // Set up a RX interrupt
+        // We need to set up the handler first
+        // And set up and enable the interrupt handlers
+        irq_set_exclusive_handler(UART1_IRQ, pico_uart1_isr);
+        irq_set_enabled(UART1_IRQ, true);
+
+        // Now enable the UART to send interrupts - RX only
+        uart_set_irq_enables(uart1, true, false);
+        break;
+    }
+    return RT_EOK;
+}
+
+static int pico_uart1_putc(struct rt_serial_device *serial, char c)
+{
+    uart_putc_raw(uart1, c);
+
+    return 1;
+}
+
+static int pico_uart1_getc(struct rt_serial_device *serial)
+{
+    int ch;
+
+    if (uart_is_readable(uart1))
+    {
+        ch = uart_get_hw(uart1)->dr;
+    }
+    else
+    {
+        ch =-1;
+    }
+
+    return ch;
+}
+
+const static struct rt_uart_ops _uart1_ops =
+{
+    pico_uart1_configure,
+    pico_uart1_control,
+    pico_uart1_putc,
+    pico_uart1_getc,
+    RT_NULL,
+};
+
+/*
+ * UART Initiation
+ */
+int rt_hw_uart1_init(void)
+{
+    rt_err_t ret = RT_EOK;
+
+    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
+
+    uart_init(uart1, 115200);
+
+    // Set the TX and RX pins by using the function select on the GPIO
+    // Set datasheet for more information on function select
+    gpio_set_function(UART1_TX_PIN, GPIO_FUNC_UART);
+    gpio_set_function(UART1_RX_PIN, GPIO_FUNC_UART);
+
+    // Actually, we want a different speed
+    // The call will return the actual baud rate selected, which will be as close as
+    // possible to that requested
+    uart_set_baudrate(uart1, BAUD_RATE);
+
+    // Set UART flow control CTS/RTS, we don't want these, so turn them off
+    uart_set_hw_flow(uart1, false, false);
+
+    // Set our data format
+    uart_set_format(uart1, DATA_BITS, STOP_BITS, PARITY);
+
+    // Turn off FIFO's - we want to do this character by character
+    uart_set_fifo_enabled(uart1, false);
+
+    uart1_dev.parent.ops = &_uart1_ops;
+    uart1_dev.parent.config = config;
+
+    ret = rt_hw_serial_register(&uart1_dev.parent,
+                                "uart1",
+                                RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                                &uart1_dev);
+
+    return ret;
+}
+INIT_DEVICE_EXPORT(rt_hw_uart1_init);