63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
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* LpcUart.h
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*
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* Created on: 4.2.2019
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* Author: keijo
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*/
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#ifndef LPCUART_H_
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#define LPCUART_H_
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#include <stdint.h>
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#include "chip.h"
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struct LpcPinMap {
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int port; /* set to -1 to indicate unused pin */
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int pin; /* set to -1 to indicate unused pin */
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};
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struct LpcUartConfig {
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LPC_USART_T *pUART;
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uint32_t speed;
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uint32_t data;
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bool rs485;
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LpcPinMap tx;
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LpcPinMap rx;
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LpcPinMap rts; /* used as output enable if RS-485 mode is enabled */
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LpcPinMap cts;
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};
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class LpcUart {
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public:
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LpcUart(const LpcUartConfig &cfg);
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LpcUart(const LpcUart &) = delete;
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virtual ~LpcUart();
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int free(); /* get amount of free space in transmit buffer */
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int peek(); /* get number of received characters in receive buffer */
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int write(char c);
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int write(const char *s);
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int write(const char *buffer, int len);
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int read(char &c); /* get a single character. Returns number of characters read --> returns 0 if no character is available */
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int read(char *buffer, int len);
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void txbreak(bool brk); /* set break signal on */
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bool rxbreak(); /* check if break is received */
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void speed(int bps); /* change transmission speed */
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bool txempty();
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void isr(); /* ISR handler. This will be called by the HW ISR handler. Do not call from application */
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private:
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LPC_USART_T *uart;
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IRQn_Type irqn;
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/* currently we support only fixed size ring buffers */
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static const int UART_RB_SIZE = 256;
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/* Transmit and receive ring buffers */
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RINGBUFF_T txring;
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RINGBUFF_T rxring;
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uint8_t rxbuff[UART_RB_SIZE];
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uint8_t txbuff[UART_RB_SIZE];
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static bool init; /* set when first UART is initialized. We have a global clock setting for all UARTSs */
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};
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#endif /* LPCUART_H_ */
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