151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "board.h"
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#include "drv_uart.h"
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#include "hardware/uart.h"
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#include "hardware/irq.h"
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#define UART_ID uart0
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#define BAUD_RATE 115200
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#define DATA_BITS 8
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#define STOP_BITS 1
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#define PARITY UART_PARITY_NONE
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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 UART_TX_PIN 0
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#define UART_RX_PIN 1
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#define PICO_UART_DEVICE(uart) (struct pico_uart_dev *)(uart)
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static struct pico_uart_dev uart0_dev;
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struct pico_uart_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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void pico_uart_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(uart0)) /* rx ind */
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{
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rt_hw_serial_isr(&uart0_dev.parent, RT_SERIAL_EVENT_RX_IND);
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}
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rt_interrupt_leave();
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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_uart_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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static rt_err_t pico_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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return RT_EOK;
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}
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static int pico_uart_putc(struct rt_serial_device *serial, char c)
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{
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uart_putc_raw(uart0, c);
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return 1;
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}
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static int pico_uart_getc(struct rt_serial_device *serial)
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{
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int ch;
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if (uart_is_readable(uart0))
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{
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ch = uart_get_hw(uart0)->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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return ch;
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}
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const static struct rt_uart_ops _uart_ops =
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{
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pico_uart_configure,
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pico_uart_control,
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pico_uart_putc,
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pico_uart_getc,
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RT_NULL,
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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_uart_init(void)
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{
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rt_err_t ret = RT_EOK;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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uart_init(UART_ID, 115200);
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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(UART_TX_PIN, GPIO_FUNC_UART);
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gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
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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(UART_ID, BAUD_RATE);
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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(UART_ID, false, false);
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// Set our data format
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uart_set_format(UART_ID, DATA_BITS, STOP_BITS, PARITY);
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// Turn off FIFO's - we want to do this character by character
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uart_set_fifo_enabled(UART_ID, false);
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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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// Select correct interrupt for the UART we are using
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int UART_IRQ = UART_ID == uart0 ? UART0_IRQ : UART1_IRQ;
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// And set up and enable the interrupt handlers
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irq_set_exclusive_handler(UART_IRQ, pico_uart_isr);
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irq_set_enabled(UART_IRQ, true);
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// Now enable the UART to send interrupts - RX only
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uart_set_irq_enables(UART_ID, true, false);
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uart0_dev.parent.ops = &_uart_ops;
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uart0_dev.parent.config = config;
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ret = rt_hw_serial_register(&uart0_dev.parent,
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"uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
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&uart0_dev);
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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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