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rt-thread-official/bsp/cypress/psoc6-pioneerkit_modus/drivers/uart.c

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#include <rtthread.h>
#include "uart.h"
#include "cycfg_peripherals.h"
/**
* @addtogroup
*/
/*@{*/
/* RT-Thread Device Interface */
/**
* This function initializes uart
*/
static rt_err_t rt_uart_init (rt_device_t dev)
{
struct uart_device* uart = (struct uart_device*) dev->user_data;
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
rt_memset(uart->int_rx->rx_buffer, 0,
sizeof(uart->int_rx->rx_buffer));
uart->int_rx->read_index = uart->int_rx->save_index = 0;
}
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
{
rt_memset(uart->int_tx->tx_buffer, 0,
sizeof(uart->int_tx->tx_buffer));
uart->int_tx->write_index = uart->int_tx->save_index = 0;
}
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
return RT_EOK;
}
/* save a char to uart buffer */
static void rt_uart_savechar(struct uart_device* uart, char ch)
{
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
uart->int_rx->rx_buffer[uart->int_rx->save_index] = ch;
uart->int_rx->save_index ++;
if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->save_index = 0;
/* if the next position is read index, discard this 'read char' */
if (uart->int_rx->save_index == uart->int_rx->read_index)
{
uart->int_rx->read_index ++;
if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->read_index = 0;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
static rt_err_t rt_uart_open(rt_device_t dev, rt_uint16_t oflag)
{
struct uart_device* uart;
oflag = oflag;
RT_ASSERT(dev != RT_NULL);
uart = (struct uart_device*) dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* enable interrupt */
UART_ENABLE_IRQ(uart->rx_irq);
}
return RT_EOK;
}
static rt_err_t rt_uart_close(rt_device_t dev)
{
struct uart_device* uart;
RT_ASSERT(dev != RT_NULL);
uart = (struct uart_device*) dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
/* disable interrupt */
UART_DISABLE_IRQ(uart->rx_irq);
}
return RT_EOK;
}
static rt_size_t rt_uart_read (rt_device_t dev, rt_off_t pos, void* buffer,
rt_size_t size)
{
rt_uint8_t* ptr;
rt_err_t err_code;
struct uart_device* uart;
pos = pos;
ptr = buffer;
err_code = RT_EOK;
uart = (struct uart_device*)dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_RX)
{
rt_base_t level;
/* interrupt mode Rx */
while (size)
{
if (uart->int_rx->read_index != uart->int_rx->save_index)
{
*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];
size --;
/* disable interrupt */
level = rt_hw_interrupt_disable();
uart->int_rx->read_index ++;
if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
uart->int_rx->read_index = 0;
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
else
{
/* set error code */
err_code = -RT_EEMPTY;
break;
}
}
}
else
{
/* polling mode */
while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
{
while (0UL != Cy_SCB_UART_GetNumInRxFifo(uart->scb_device))
{
*ptr = Cy_SCB_UART_Get(uart->scb_device);
ptr ++;
}
}
}
/* set error code */
rt_set_errno(err_code);
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
static rt_size_t rt_uart_write (rt_device_t dev, rt_off_t pos,
const void* buffer, rt_size_t size)
{
rt_uint8_t* ptr;
rt_err_t err_code;
struct uart_device* uart;
pos = pos;
err_code = RT_EOK;
ptr = (rt_uint8_t*)buffer;
uart = (struct uart_device*)dev->user_data;
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
{
/* interrupt mode Tx */
while (uart->int_tx->save_index != uart->int_tx->write_index)
{
/* save on tx buffer */
uart->int_tx->tx_buffer[uart->int_tx->save_index] = *ptr++;
-- size;
/* move to next position */
uart->int_tx->save_index ++;
/* wrap save index */
if (uart->int_tx->save_index >= UART_TX_BUFFER_SIZE)
uart->int_tx->save_index = 0;
}
/* set error code */
if (size > 0)
err_code = -RT_EFULL;
}
else
{
/* polling mode */
while (size)
{
/*
* to be polite with serial console add a line feed
* to the carriage return character
*/
if (*ptr == '\n' && (dev->flag & RT_DEVICE_FLAG_STREAM))
{
while(0 == Cy_SCB_UART_Put(uart->scb_device, '\r'));
}
while(0 == Cy_SCB_UART_Put(uart->scb_device, (*ptr & 0x1FF)));
++ptr;
--size;
}
}
/* set error code */
rt_set_errno(err_code);
return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
}
static rt_err_t rt_uart_control (rt_device_t dev, int cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
args = args;
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
break;
case RT_DEVICE_CTRL_RESUME:
/* resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
break;
}
return RT_EOK;
}
/*
* serial register
*/
rt_err_t rt_hw_uart_register(rt_device_t device, const char* name,
rt_uint32_t flag, struct uart_device *serial)
{
RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_Char;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_uart_init;
device->open = rt_uart_open;
device->close = rt_uart_close;
device->read = rt_uart_read;
device->write = rt_uart_write;
device->control = rt_uart_control;
device->user_data = serial;
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/* ISR for uart interrupt */
void rt_hw_uart_isr(rt_device_t device)
{
struct uart_device* uart = (struct uart_device*) device->user_data;
/* interrupt mode receive */
RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);
/* Check for "RX fifo not empty interrupt" */
if((uart->scb_device->INTR_RX_MASKED & SCB_INTR_RX_MASKED_NOT_EMPTY_Msk ) != 0)
{
/* Clear UART "RX fifo not empty interrupt" */
uart->scb_device->INTR_RX = uart->scb_device->INTR_RX & SCB_INTR_RX_NOT_EMPTY_Msk;
/* Get the character from terminal */
rt_uart_savechar(uart, Cy_SCB_UART_Get(uart->scb_device));
}
/* invoke callback */
if (device->rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?
UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :
uart->int_rx->save_index - uart->int_rx->read_index;
device->rx_indicate(device, rx_length);
}
}
#ifdef RT_USING_UART0
/* UART0 device driver structure */
#define UART0_SCB_IRQ__INTC_NUMBER 46u
cy_stc_scb_uart_context_t UART0_context;
const cy_stc_sysint_t UART0_SCB_IRQ_cfg =
{
.intrSrc = scb_5_interrupt_IRQn,
.intrPriority = 3u,
};
/* UART0 device driver structure */
struct uart_int_rx uart0_int_rx;
struct uart_device uart0 =
{
UART0_HW,
&UART0_config,
&UART0_context,
&UART0_SCB_IRQ_cfg,
(IRQn_Type)UART0_SCB_IRQ__INTC_NUMBER,
(IRQn_Type)UART0_SCB_IRQ__INTC_NUMBER,
&uart0_int_rx,
RT_NULL
};
struct rt_device uart0_device;
/* UART0 Interrupt Hanlder */
void uart0_isr_callback(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_hw_uart_isr(&uart0_device);
/* leave interrupt */
rt_interrupt_leave();
}
#endif
void rt_hw_uart_init(void)
{
/* Start UART operation. */
if(Cy_SCB_UART_Init(uart0.scb_device, uart0.uart_config, uart0.uart_context) != CY_SCB_UART_SUCCESS)
{
rt_assert_handler("UART0 init", __FUNCTION__, __LINE__);
}
Cy_SCB_UART_Enable(uart0.scb_device);
/* Unmasking only the RX fifo not empty interrupt bit */
uart0.scb_device->INTR_RX_MASK = SCB_INTR_RX_MASK_NOT_EMPTY_Msk;
/* Interrupt Settings for UART */
Cy_SysInt_Init(uart0.uart_int, uart0_isr_callback);
/* Enable the interrupt */
NVIC_EnableIRQ(uart0.uart_int->intrSrc);
/* register UART0 device */
rt_hw_uart_register(&uart0_device,
"uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
&uart0);
}
/*@}*/
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