Thomas SOETE / SimpleLib

Simple mbed library with macros

Dependents:   SimpleTimer SimpleUART SimpleTimer Stoppuhr1

serial.h@0:aa3c3d1a5918, 2010-11-07 (annotated)

Committer:
Alkorin
Date:
Sun Nov 07 11:28:38 2010 +0000
Revision:
0:aa3c3d1a5918
Child:
3:0b94bf95c552
1st publish

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Alkorin 0:aa3c3d1a5918 1 #ifndef __SERIAL_H__
Alkorin 0:aa3c3d1a5918 2 #define __SERIAL_H__
Alkorin 0:aa3c3d1a5918 3
Alkorin 0:aa3c3d1a5918 4 #include "interrupt.h"
Alkorin 0:aa3c3d1a5918 5 #include "mbed_globals.h"
Alkorin 0:aa3c3d1a5918 6
Alkorin 0:aa3c3d1a5918 7 /** Serial port (Choose UARTn (0,2,3)) **/
Alkorin 0:aa3c3d1a5918 8 #define UART_BASE LPC_UART0_BASE
Alkorin 0:aa3c3d1a5918 9
Alkorin 0:aa3c3d1a5918 10 /** Registers **/
Alkorin 0:aa3c3d1a5918 11 // UARTn Receiver Buffer Register
Alkorin 0:aa3c3d1a5918 12 #define UnRBR 0x00
Alkorin 0:aa3c3d1a5918 13 // UARTn Transmit Holding Register
Alkorin 0:aa3c3d1a5918 14 #define UnTHR 0x00
Alkorin 0:aa3c3d1a5918 15 // UARTn Interrupt Enable Register
Alkorin 0:aa3c3d1a5918 16 #define UnIER 0x04
Alkorin 0:aa3c3d1a5918 17 // UARTn Interrupt Identification Register
Alkorin 0:aa3c3d1a5918 18 #define UnIIR 0x08
Alkorin 0:aa3c3d1a5918 19 // UARTn Line Status Register
Alkorin 0:aa3c3d1a5918 20 #define UnLSR 0x14
Alkorin 0:aa3c3d1a5918 21
Alkorin 0:aa3c3d1a5918 22 /** Bits **/
Alkorin 0:aa3c3d1a5918 23 // RBR Interrupt Enable (UnIER, 14.4.4 p302)
Alkorin 0:aa3c3d1a5918 24 #define RBR_INT_BIT 0
Alkorin 0:aa3c3d1a5918 25 // Receiver Data Ready (UnLSR, 14.4.8 p306)
Alkorin 0:aa3c3d1a5918 26 #define RDR_BIT 0
Alkorin 0:aa3c3d1a5918 27 // Transmitter Holding Register Empty (UnLSR, 14.4.8 p306)
Alkorin 0:aa3c3d1a5918 28 #define THRE_BIT 5
Alkorin 0:aa3c3d1a5918 29
Alkorin 0:aa3c3d1a5918 30 /** Macros **/
Alkorin 0:aa3c3d1a5918 31 #define SERIAL_PUTCHAR(c) while (GET_BIT_VALUE(UART_BASE + UnLSR, THRE_BIT) == 0); \
Alkorin 0:aa3c3d1a5918 32 SET_REGISTER8(UART_BASE + UnTHR, c)
Alkorin 0:aa3c3d1a5918 33
Alkorin 0:aa3c3d1a5918 34 #define SERIAL_DATA_TO_READ() (GET_BIT_VALUE(UART_BASE + UnLSR, RDR_BIT) == 1)
Alkorin 0:aa3c3d1a5918 35
Alkorin 0:aa3c3d1a5918 36 #define SERIAL_GETCHAR() GET_REGISTER8(UART_BASE + UnRBR)
Alkorin 0:aa3c3d1a5918 37
Alkorin 0:aa3c3d1a5918 38 // See 14.4.5 p303
Alkorin 0:aa3c3d1a5918 39 inline int SERIAL_CHECK_INTERRUPT(void) {
Alkorin 0:aa3c3d1a5918 40 unsigned int serialStatus = GET_REGISTER32(UART_BASE + UnIIR);
Alkorin 0:aa3c3d1a5918 41
Alkorin 0:aa3c3d1a5918 42 if (serialStatus & 1) // IntStatus, 1 = No Interrupt is pending.
Alkorin 0:aa3c3d1a5918 43 return 0;
Alkorin 0:aa3c3d1a5918 44
Alkorin 0:aa3c3d1a5918 45 serialStatus = (serialStatus >> 1) & 0x3; // IntId, 2 = More than threshold data to read, 6 = Some caracters to read
Alkorin 0:aa3c3d1a5918 46 if (serialStatus != 2 && serialStatus != 6)
Alkorin 0:aa3c3d1a5918 47 return 0;
Alkorin 0:aa3c3d1a5918 48
Alkorin 0:aa3c3d1a5918 49 return 1;
Alkorin 0:aa3c3d1a5918 50 }
Alkorin 0:aa3c3d1a5918 51
Alkorin 0:aa3c3d1a5918 52 #endif