Altium教程Simple UART LH79520软件设计B1

Logic Zoom SDK - Simple UART - LH79520软件设计第一部分 原理图1.1Logic Zoom SDK - Simple UART.SchDocU201.2hardware.c/********************************************************************\|*|* Version : 1.0|*|* Copyright : Copyright (C) 2006, PurPer|*|* Description : This project uses the serial interface of the Logic|* Zoom development board to output a message and echo|* some text to an HyperTerminal interface for example.|*\********************************************************************/#include "hardware.h"#include <string.h>/** Constants and definitions*/#define STR_SIZE 255/*********************************************************************** |*|* Function : uart_init|*|* Parameters :|*|* Returns :|* Description : Enable and initialize the UART interface.*/void uart_init( void ){// Enable UART1 on Multiplexed Pins - p154 of LH79520 User's GuideIOCON_UARTMux(IOCONBase) |= ( IOCON_UARTMux_U1RxD | IOCON_UARTMux_U1TxD );// Activate UART1 clock - p136 of LH79520 User's GuideRCPC_PeriphClkCtrl1(RCPCBase) &= ~(0x1 << 2);// Select UART1 clock source - p140 of LH79520 User's GuideRCPC_PeriphClkSelect(RCPCBase) &= ~(0x1 << 2);// Set 1 Stop bits, 8-bit word lenght and no parity - p350 of LH79520 User's GuideUART1_UARTLCR_H(UART1Base) = UART1_UARTLCR_H_FEN | UART1_UARTLCR_H_WLEN8;// p354UART1_UARTIFLS(UART1Base) = UART1_UARTIFLS_TXIFLSEL(2) | UART1_UARTIFLS_RXIFLSEL(2);// Clear all interrupts for UART1 - p355 of LH79520 User's GuideUART1_UARTICR(UART1Base) = UART1_UARTICR_OEIC | UART1_UARTICR_BEIC | UART1_UARTICR_PEIC |UART1_UARTICR_FEIC | UART1_UARTICR_RTIC | UART1_UARTICR_TXIC |UART1_UARTICR_RXIC;// Disable all interrupt for UART1 - p355 of LH79520 User's GuideUART1_UARTIMSC(UART1Base) = 0;// Disable CTS/RTS flow control - p352 - not sure why it should be commented but it works without ???//UART1_UARTCR(UART1Base) = UART1_UARTCR_TXE | UART1_UARTCR_RXE | UART1_UARTCR_UARTEN;/***********************************************************************|*|* Function : uart_read|*|* Parameters : buffer = string|* n_bytes = size of string|*|* Returns : bytes = number of bytes read|*|* Description : Read data from the UART and returns the number of|* characters read.*/unsigned int uart_read( void * buffer, unsigned int n_bytes ){unsigned char *data = (unsigned char *) buffer;unsigned int bytes = 0;while ( (n_bytes > 0) && ( (UART1_UARTFR(UART1Base) & UART1_UARTFR_RXFE) == 0 ) ) {// Read data from the FIFP into the buffer*data = UART1_UARTDR(UART1Base); // (unsigned char)data++;// Increment data count and decrement buffer size coundbytes++;n_bytes--;}return bytes;}/*********************************************************************** |*|* Function : uart_write|*|* Parameters : buffer = string|* n_bytes = size of string|*|* Returns : bytes = number of bytes written|*|* Description : Write data to the UART and returns the number of|* characters written.*/unsigned int uart_write( void * buffer, unsigned int n_bytes ){unsigned char *data = (unsigned char*) buffer;unsigned int bytes = 0;while( n_bytes > 0 ){if ( (UART1_UARTFR(UART1Base) & UART1_UARTFR_TXFF) == 0 ){UART1_UARTDR(UART1Base) = *data;data++;bytes++;n_bytes--;}}return bytes;}/*********************************************************************** |*|* Function : uart_write_welcome|*|* Parameters :|*|* Returns :|*|* Description : Ouputs instructions through the serial interface.*/void uart_write_welcome( void ){char * line0 = "\r\n";char * line1 = "************************************************\r\n";char * line2 = " Hello Example for Logic Zoom LH79520 Dev Kit\r\n";char * line3 = "\r\n";char * line4 = " Version 1.0\r\n";char * line5 = "************************************************\r\n";char * line6 = " Type some text and press the Enter key to\r\n";char * line7 = " echo a string of 256 characters maximum\r\n";char * line8 = "************************************************\r\n";uart_write(line0, strlen(line0));uart_write(line1, strlen(line1));uart_write(line2, strlen(line2));uart_write(line3, strlen(line3));uart_write(line4, strlen(line4));uart_write(line5, strlen(line5));uart_write(line6, strlen(line6));uart_write(line7, strlen(line7));uart_write(line8, strlen(line8));}/*********************************************************************** |*|* Function : main|*|* Parameters :|*|* Returns :|*|* Description : main function*/void main( void ){unsigned int index = 0;char output[STR_SIZE];char buffer[10];uart_init();uart_write_welcome();output[0] = '\0';while (1){while(uart_read(buffer, 1) == 0);buffer[1] = '\0';if((buffer[0] == '\r') || (index >= STR_SIZE)) {uart_write("\r\n",2);uart_write("You typed - ", 12);uart_write(output, strlen(output));uart_write("\r\n",2);output[0] = '\0';index = 0;}else{strcat(output, buffer);uart_write(buffer, 1);}index++;}}1.3main.c/********************************************************************\|*|* Version : 1.0|*|* Copyright : Copyright (C) 2006, PurPer|*|* Description : This project flashes the Status Leds of the Logic|* Zoom development board.|*\********************************************************************//** Registers definitions*/#define GPIO2Base 0xFFFDD000#define GPIO2_BASE(base) ((volatile unsigned char *) base)#define GPIO2_PFDR(base) GPIO2_BASE(base)[0x04] // Port F Data Register#define GPIO2_PFDDR(base) GPIO2_BASE(base)[0x0C] // Port F Data Direction Register/***********************************************************************|*|* Function : delay|*|* Parameters :|*|* Returns :|*|* Description : Creates a delay*/void delay (void){ /* Wait function */unsigned long i, j;for ( i = 0 ; i < 2048 ; i++ ){for ( j = 0 ; j < 2048 ; j++ ){__asm("NOP");}}}/*********************************************************************** |*|* Function : main|*|* Parameters :|*|* Returns :|*|* Description : main function*/void main (void){// Trun Off Status Led 0 & 1 - PFDR.1 = 1 & PFDR.2 = 1GPIO2_PFDR(GPIO2Base) = 0x06;// Set bits 1 & 2 of Port F in Output modeGPIO2_PFDDR(GPIO2Base) = 0x06;while (1){// Trun Off Status Led 1 - PFDR.2 = 1GPIO2_PFDR(GPIO2Base) |= 0x04;// Trun On Status Led 0 - PFDR.1 = 0GPIO2_PFDR(GPIO2Base) &= ~0x02;delay();// Trun Off Status Led 0 - PFDR.1 = 1GPIO2_PFDR(GPIO2Base) |= 0x02;// Trun On Status Led 1 - PFDR.2 = 0GPIO2_PFDR(GPIO2Base) &= ~0x04;delay();}}第11页 共11页。