296 lines
8.6 KiB
C
296 lines
8.6 KiB
C
#include <GenericTypeDefs.h>
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#include <plib.h>
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#include <rtthread.h>
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#include "uart.h"
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#define GetSystemClock() (80000000ul)
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#define GetPeripheralClock() (GetSystemClock()/(1 << OSCCONbits.PBDIV))
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#define GetInstructionClock() (GetSystemClock())
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struct rt_uart_pic32
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{
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struct rt_device parent;
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int uart; /* UART Module ID. */
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/* buffer for reception */
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rt_uint8_t read_index, save_index;
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rt_uint8_t rx_buffer[RT_UART_RX_BUFFER_SIZE];
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};
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#ifdef RT_USING_UART1
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static struct rt_uart_pic32 uart1_device;
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#endif
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#ifdef RT_USING_UART2
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static struct rt_uart_pic32 uart2_device;
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#endif
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static rt_err_t rt_uart_init (rt_device_t dev)
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{
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struct rt_uart_pic32 *uart_device = (struct rt_uart_pic32*)dev;
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UARTConfigure(uart_device->uart, UART_ENABLE_PINS_TX_RX_ONLY);
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UARTSetFifoMode(uart_device->uart, UART_INTERRUPT_ON_TX_NOT_FULL | UART_INTERRUPT_ON_RX_NOT_EMPTY);
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UARTSetLineControl(uart_device->uart, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);
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UARTSetDataRate(uart_device->uart, GetPeripheralClock(), 115200);
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UARTEnable(uart_device->uart, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX | UART_TX));
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// Configure UART RX Interrupt
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INTEnable(INT_SOURCE_UART_RX(uart_device->uart), INT_ENABLED);
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INTSetVectorPriority(INT_VECTOR_UART(uart_device->uart), INT_PRIORITY_LEVEL_2);
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INTSetVectorSubPriority(INT_VECTOR_UART(uart_device->uart), INT_SUB_PRIORITY_LEVEL_0);
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return RT_EOK;
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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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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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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, rt_size_t size)
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{
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rt_uint8_t* ptr;
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struct rt_uart_pic32 *uart_device = (struct rt_uart_pic32*)dev;
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RT_ASSERT(uart_device != RT_NULL);
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/* point to buffer */
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ptr = (rt_uint8_t*) buffer;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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while (size)
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{
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/* interrupt receive */
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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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if (uart_device->read_index != uart_device->save_index)
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{
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*ptr = uart_device->rx_buffer[uart_device->read_index];
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uart_device->read_index ++;
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if (uart_device->read_index >= RT_UART_RX_BUFFER_SIZE)
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uart_device->read_index = 0;
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}
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else
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{
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/* no data in rx buffer */
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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break;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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ptr ++;
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size --;
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}
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return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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}
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return 0;
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}
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static rt_size_t rt_uart_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
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{
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struct rt_uart_pic32 *uart_device = (struct rt_uart_pic32*)dev;
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char *ptr;
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ptr = (char*)buffer;
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if (dev->flag & RT_DEVICE_FLAG_STREAM)
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{
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/* stream mode */
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while (size)
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{
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if (*ptr == '\n')
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{
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while(!UARTTransmitterIsReady(uart_device->uart));
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UARTSendDataByte(uart_device->uart,'\r' );
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while(!UARTTransmissionHasCompleted(uart_device->uart));
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}
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while(!UARTTransmitterIsReady(uart_device->uart));
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UARTSendDataByte(uart_device->uart, *ptr);
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while(!UARTTransmissionHasCompleted(uart_device->uart));
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ptr ++;
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size --;
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}
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}
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else
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{
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while ( size != 0 )
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{
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while(!UARTTransmitterIsReady(uart_device->uart));
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UARTSendDataByte(uart_device->uart, *ptr);
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while(!UARTTransmissionHasCompleted(uart_device->uart));
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ptr++;
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size--;
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}
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}
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return (rt_size_t) ptr - (rt_size_t) buffer;
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}
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#ifdef RT_USING_UART1
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// UART 1 interrupt handler
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// it is set at priority level 2
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void __ISR(_UART1_VECTOR, ipl2) IntUART1Handler(void)
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{
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struct rt_uart_pic32 *uart_device = &uart1_device;
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// Is this an RX interrupt?
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if(INTGetFlag(INT_SOURCE_UART_RX(uart_device->uart)))
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{
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while( U1STAbits.URXDA )
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{
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/* Receive Data Available */
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uart_device->rx_buffer[uart_device->save_index] = UARTGetDataByte(uart_device->uart);//UARTGetDataByte(UART1);
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uart_device->save_index ++;
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if (uart_device->save_index >= RT_UART_RX_BUFFER_SIZE)
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{
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uart_device->save_index = 0;
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}
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}
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/* invoke callback */
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if(uart_device->parent.rx_indicate != RT_NULL)
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{
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rt_size_t length;
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if (uart_device->read_index > uart_device->save_index)
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{
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length = RT_UART_RX_BUFFER_SIZE - uart_device->read_index + uart_device->save_index;
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}
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else
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{
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length = uart_device->save_index - uart_device->read_index;
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}
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if( length )
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{
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uart_device->parent.rx_indicate(&uart_device->parent, length);
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}
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}
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// Clear the RX interrupt Flag
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INTClearFlag(INT_SOURCE_UART_RX(uart_device->uart));
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} // Is this an RX interrupt?
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// We don't care about TX interrupt
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if ( INTGetFlag(INT_SOURCE_UART_TX(uart_device->uart)) )
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{
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INTClearFlag(INT_SOURCE_UART_TX(uart_device->uart));
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}
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}
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#endif
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#ifdef RT_USING_UART2
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// UART 2 interrupt handler
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// it is set at priority level 2
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void __ISR(_UART2_VECTOR, ipl2) IntUART2Handler(void)
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{
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struct rt_uart_pic32 *uart_device = &uart2_device;
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// Is this an RX interrupt?
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if(INTGetFlag(INT_SOURCE_UART_RX(uart_device->uart)))
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{
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while( U2STAbits.URXDA )
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{
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/* Receive Data Available */
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uart_device->rx_buffer[uart_device->save_index] = UARTGetDataByte(uart_device->uart);//UARTGetDataByte(UART1);
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uart_device->save_index ++;
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if (uart_device->save_index >= RT_UART_RX_BUFFER_SIZE)
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{
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uart_device->save_index = 0;
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}
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}
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/* invoke callback */
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if(uart_device->parent.rx_indicate != RT_NULL)
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{
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rt_size_t length;
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if (uart_device->read_index > uart_device->save_index)
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{
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length = RT_UART_RX_BUFFER_SIZE - uart_device->read_index + uart_device->save_index;
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}
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else
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{
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length = uart_device->save_index - uart_device->read_index;
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}
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if( length )
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{
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uart_device->parent.rx_indicate(&uart_device->parent, length);
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}
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}
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// Clear the RX interrupt Flag
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INTClearFlag(INT_SOURCE_UART_RX(uart_device->uart));
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} // Is this an RX interrupt?
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// We don't care about TX interrupt
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if ( INTGetFlag(INT_SOURCE_UART_TX(uart_device->uart)) )
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{
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INTClearFlag(INT_SOURCE_UART_TX(uart_device->uart));
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}
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}
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#endif
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void rt_hw_usart_init(void)
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{
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struct rt_uart_pic32 *uart_device;
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#ifdef RT_USING_UART1
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/* device initialization */
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uart_device = &uart1_device;
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rt_memset(uart_device,0,sizeof(struct rt_uart_pic32));
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uart_device->uart = UART1;
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uart_device->parent.type = RT_Device_Class_Char;
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/* device interface */
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uart_device->parent.init = rt_uart_init;
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uart_device->parent.open = rt_uart_open;
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uart_device->parent.close = rt_uart_close;
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uart_device->parent.read = rt_uart_read;
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uart_device->parent.write = rt_uart_write;
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uart_device->parent.control = RT_NULL;
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uart_device->parent.user_data = RT_NULL;
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rt_device_register(&uart_device->parent,
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"uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
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#endif
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#ifdef RT_USING_UART2
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/* device initialization */
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uart_device = &uart2_device;
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rt_memset(uart_device,0,sizeof(struct rt_uart_pic32));
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uart_device->uart = UART2;
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uart_device->parent.type = RT_Device_Class_Char;
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/* device interface */
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uart_device->parent.init = rt_uart_init;
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uart_device->parent.open = rt_uart_open;
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uart_device->parent.close = rt_uart_close;
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uart_device->parent.read = rt_uart_read;
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uart_device->parent.write = rt_uart_write;
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uart_device->parent.control = RT_NULL;
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uart_device->parent.user_data = RT_NULL;
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rt_device_register(&uart_device->parent,
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"uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_INT_RX);
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#endif
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}
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