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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2009-02-05 Bernard first version
* 2009-10-25 Bernard fix rt_serial_read bug when there is no data
* in the buffer.
* 2010-03-29 Bernard cleanup code.
* 2010-03-30 Kyle Ported from STM32 to AVR32.
* 2023-10-25 Raman Gopalan UART driver for at32uc3a: Initial version
* 2023-11-06 Raman Gopalan Driver abstractions for uc3a and uc3b devices
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "drv_uart.h"
#ifdef RT_USING_SERIAL
#include "compiler.h"
#include "usart.h"
#include "gpio.h"
#include "intc.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 avr32uc3_uart0_isr(void);
#endif
#ifdef BSP_USING_UART1
void avr32uc3_uart1_isr(void);
#endif
#ifdef BSP_USING_UART2
void avr32uc3_uart2_isr(void);
#endif
/* AVR32UC3B uart driver */
struct avr32uc3_uart_dev
{
rt_serial_t parent;
avr32_usart_t *instance;
rt_uint32_t irqno;
rt_uint32_t irq_level;
rt_uint32_t tx_pin;
rt_uint32_t tx_pin_function;
rt_uint32_t rx_pin;
rt_uint32_t rx_pin_function;
void (*uart_isr)(void);
};
static struct avr32uc3_uart_dev uart_dev[] =
{
#ifdef BSP_USING_UART0
{
.instance = (avr32_usart_t *)&AVR32_USART0,
.irqno = AVR32_USART0_IRQ,
.irq_level = AVR32_INTC_INT0,
.tx_pin = BSP_UART0_TX_PIN,
.tx_pin_function = BSP_UART0_TX_PIN_FUNCTION,
.rx_pin = BSP_UART0_RX_PIN,
.rx_pin_function = BSP_UART0_RX_PIN_FUNCTION,
.uart_isr = avr32uc3_uart0_isr,
},
#endif
#ifdef BSP_USING_UART1
{
.instance = (avr32_usart_t *)&AVR32_USART1,
.irqno = AVR32_USART1_IRQ,
.irq_level = AVR32_INTC_INT0,
.tx_pin = BSP_UART1_TX_PIN,
.tx_pin_function = BSP_UART1_TX_PIN_FUNCTION,
.rx_pin = BSP_UART1_RX_PIN,
.rx_pin_function = BSP_UART1_RX_PIN_FUNCTION,
.uart_isr = avr32uc3_uart1_isr,
},
#endif
#ifdef BSP_USING_UART2
{
.instance = (avr32_usart_t *)&AVR32_USART2,
.irqno = AVR32_USART2_IRQ,
.irq_level = AVR32_INTC_INT0,
.tx_pin = BSP_UART2_TX_PIN,
.tx_pin_function = BSP_UART2_TX_PIN_FUNCTION,
.rx_pin = BSP_UART2_RX_PIN,
.rx_pin_function = BSP_UART2_RX_PIN_FUNCTION,
.uart_isr = avr32uc3_uart2_isr,
},
#endif
};
enum
{
#ifdef BSP_USING_UART0
UART0_INDEX,
#endif
#ifdef BSP_USING_UART1
UART1_INDEX,
#endif
#ifdef BSP_USING_UART2
UART2_INDEX,
#endif
};
#ifdef BSP_USING_UART0
void avr32uc3_uart0_isr(void)
{
rt_interrupt_enter();
/* read interrupt status and clear it */
if (usart_test_hit(&AVR32_USART0)) /* 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 avr32uc3_uart1_isr(void)
{
rt_interrupt_enter();
/* read interrupt status and clear it */
if (usart_test_hit(&AVR32_USART1)) /* rx ind */
{
rt_hw_serial_isr(&uart_dev[UART1_INDEX].parent, RT_SERIAL_EVENT_RX_IND);
}
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART2
void avr32uc3_uart2_isr(void)
{
rt_interrupt_enter();
/* read interrupt status and clear it */
if (usart_test_hit(&AVR32_USART2)) /* rx ind */
{
rt_hw_serial_isr(&uart_dev[UART2_INDEX].parent, RT_SERIAL_EVENT_RX_IND);
}
rt_interrupt_leave();
}
#endif
/**
* @addtogroup AVR32UC3
*/
/*@{*/
static rt_err_t avr32uc3_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct avr32uc3_uart_dev *uart = RT_NULL;
unsigned char l_parity;
unsigned short l_stop;
unsigned long l_baud;
unsigned char l_data_bits;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = rt_container_of(serial, struct avr32uc3_uart_dev, parent);
// Set the TX and RX pins by using the function select on the GPIO
// Set datasheet for more information on function select
gpio_enable_module_pin(uart->tx_pin, uart->tx_pin_function);
gpio_enable_module_pin(uart->rx_pin, uart->rx_pin_function);
/* Parity settings */
if (cfg->parity == PARITY_ODD)
l_parity = USART_ODD_PARITY;
else if (cfg->parity == PARITY_EVEN)
l_parity = USART_EVEN_PARITY;
else
l_parity = USART_NO_PARITY;
/* Stopbit settings */
if (cfg->stop_bits == STOP_BITS_1)
l_stop = USART_1_STOPBIT;
else
l_stop = USART_2_STOPBITS;
l_baud = cfg->baud_rate;
l_data_bits = cfg->data_bits;
/* Populate */
usart_options_t usart_options = {
.baudrate = l_baud,
.charlength = l_data_bits,
.paritytype = l_parity,
.stopbits = l_stop,
.channelmode = USART_NORMAL_CHMODE
};
usart_init_rs232(uart->instance, &usart_options, FPBA);
return RT_EOK;
}
static rt_err_t avr32uc3_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct avr32uc3_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct avr32uc3_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
//INTC_init_interrupts();
INTC_register_interrupt(uart->uart_isr, uart->irqno, uart->irq_level);
uart->instance->ier = AVR32_USART_IER_RXRDY_MASK;
break;
}
return RT_EOK;
}
static int avr32uc3_uart_putc(struct rt_serial_device *serial, char c)
{
struct avr32uc3_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct avr32uc3_uart_dev, parent);
usart_putchar(uart->instance, c);
return 1;
}
static int avr32uc3_uart_getc(struct rt_serial_device *serial)
{
struct avr32uc3_uart_dev *uart = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart = rt_container_of(serial, struct avr32uc3_uart_dev, parent);
int ch;
if (usart_read_char(uart->instance, &ch) == USART_SUCCESS)
return ch;
return -1;
}
const static struct rt_uart_ops _uart_ops =
{
avr32uc3_uart_configure,
avr32uc3_uart_control,
avr32uc3_uart_putc,
avr32uc3_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
#ifdef BSP_USING_UART2
uart_dev[UART2_INDEX].parent.ops = &_uart_ops;
uart_dev[UART2_INDEX].parent.config = config;
ret = rt_hw_serial_register(&uart_dev[UART2_INDEX].parent,
"uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
&uart_dev[UART2_INDEX]);
RT_ASSERT(ret == RT_EOK);
#endif
return ret;
}
#endif /* RT_USING_SERIAL */
/*@}*/
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