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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-09-26 1ridic Integrate with RT-Thread driver framework.
*/
#include <rtdevice.h>
#include <drv_uart.h>
#include <hardware/gpio.h>
#ifdef RT_USING_SERIAL
#include "hardware/uart.h"
#include "hardware/irq.h"
#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1)
#error "Please define at least one BSP_USING_UARTx"
/* this driver can be disabled at menuconfig -> RT-Thread Components -> Device Drivers */
#endif
#ifdef BSP_USING_UART0
void pico_uart0_isr(void);
#endif
#ifdef BSP_USING_UART1
void pico_uart1_isr(void);
#endif
struct pico_uart_dev
{
rt_serial_t parent;
uart_inst_t *instance;
rt_uint32_t irqno;
rt_uint32_t tx_pin;
rt_uint32_t rx_pin;
void (*uart_isr)(void);
};
static struct pico_uart_dev uart_dev[] =
{
#ifdef BSP_USING_UART0
{
.instance = uart0,
.irqno = UART0_IRQ,
.tx_pin = BSP_UART0_TX_PIN,
.rx_pin = BSP_UART0_RX_PIN,
.uart_isr = pico_uart0_isr,
},
#endif
#ifdef BSP_USING_UART1
{
.instance = uart1,
.irqno = UART1_IRQ,
.tx_pin = BSP_UART1_TX_PIN,
.rx_pin = BSP_UART1_RX_PIN,
.uart_isr = pico_uart1_isr,
},
#endif
};
enum
{
#ifdef BSP_USING_UART0
UART0_INDEX,
#endif
#ifdef BSP_USING_UART1
UART1_INDEX,
#endif
};
#ifdef BSP_USING_UART0
void pico_uart0_isr(void)
{
rt_interrupt_enter();
/* read interrupt status and clear it */
if (uart_is_readable(uart0)) /* rx ind */
{
rt_hw_serial_isr(&uart_dev[UART0_INDEX].parent, RT_SERIAL_EVENT_RX_IND);
}
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART1
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(&uart_dev[UART1_INDEX].parent, RT_SERIAL_EVENT_RX_IND);
}
rt_interrupt_leave();
}
#endif
/*
* UART interface
*/
static rt_err_t pico_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct pico_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = rt_container_of(serial, struct pico_uart_dev, parent);
uart_init(uart->instance, cfg->baud_rate);
// 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(uart->rx_pin, GPIO_FUNC_UART);
gpio_set_function(uart->tx_pin, GPIO_FUNC_UART);
// Set UART flow control CTS/RTS
if (cfg->flowcontrol == RT_SERIAL_FLOWCONTROL_CTSRTS)
uart_set_hw_flow(uart->instance, true, true);
else
uart_set_hw_flow(uart->instance, false, false);
// Set our data format
uart_parity_t uart_parity = UART_PARITY_NONE;
if (cfg->parity == PARITY_ODD)
uart_parity = UART_PARITY_ODD;
else if (cfg->parity == PARITY_EVEN)
uart_parity = UART_PARITY_EVEN;
uart_set_format(uart->instance, cfg->data_bits, cfg->stop_bits, uart_parity);
// Turn off FIFO's - we want to do this character by character
uart_set_fifo_enabled(uart->instance, false);
return RT_EOK;
}
static rt_err_t pico_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct pico_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct pico_uart_dev, parent);
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(uart->irqno, uart->uart_isr);
irq_set_enabled(uart->irqno, true);
// Now enable the UART to send interrupts - RX only
uart_set_irq_enables(uart->instance, true, false);
break;
}
return RT_EOK;
}
static int pico_uart_putc(struct rt_serial_device *serial, char c)
{
struct pico_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct pico_uart_dev, parent);
uart_putc_raw(uart->instance, c);
return 1;
}
static int pico_uart_getc(struct rt_serial_device *serial)
{
struct pico_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct pico_uart_dev, parent);
int ch;
if (uart_is_readable(uart->instance))
{
ch = uart_get_hw(uart->instance)->dr;
}
else
{
ch = -1;
}
return ch;
}
const static struct rt_uart_ops _uart_ops =
{
pico_uart_configure,
pico_uart_control,
pico_uart_putc,
pico_uart_getc,
RT_NULL,
};
/*
* UART Initiation
*/
int rt_hw_uart_init(void)
{
rt_err_t ret = RT_EOK;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef BSP_USING_UART0
uart_dev[UART0_INDEX].parent.ops = &_uart_ops;
uart_dev[UART0_INDEX].parent.config = config;
ret = rt_hw_serial_register(&uart_dev[UART0_INDEX].parent,
"uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
&uart_dev[UART0_INDEX]);
RT_ASSERT(ret == RT_EOK);
#endif
#ifdef BSP_USING_UART1
uart_dev[UART1_INDEX].parent.ops = &_uart_ops;
uart_dev[UART1_INDEX].parent.config = config;
ret = rt_hw_serial_register(&uart_dev[UART1_INDEX].parent,
"uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
&uart_dev[UART1_INDEX]);
RT_ASSERT(ret == RT_EOK);
#endif
return ret;
}
#endif /* RT_USING_SERIAL */
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