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