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