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i am using lpc 1768 but i dont know how to set how to set LPC_UART1->LCR=?? value for 4800 baud,8 data bits,odd parity,1 stop.I hope that someone help me. Thank you.
\mcb1700.code_.bundle.lpc17xx.keil_\keil_examples\UART
/**************************************************************************** * $Id:: uart.c 5751 2010-11-30 23:56:11Z usb00423 $ * Project: NXP LPC17xx UART example * * Description: * This file contains UART code example which include UART initialization, * UART interrupt handler, and APIs for UART access. * **************************************************************************** * Software that is described herein is for illustrative purposes only * which provides customers with programming information regarding the * products. This software is supplied "AS IS" without any warranties. * NXP Semiconductors assumes no responsibility or liability for the * use of the software, conveys no license or title under any patent, * copyright, or mask work right to the product. NXP Semiconductors * reserves the right to make changes in the software without * notification. NXP Semiconductors also make no representation or * warranty that such application will be suitable for the specified * use without further testing or modification. ****************************************************************************/ /***************************************************************************** ** Function name: UARTInit ** ** Descriptions: Initialize UART port, setup pin select, ** clock, parity, stop bits, FIFO, etc. ** ** parameters: portNum(0 or 1) and UART baudrate ** Returned value: true or false, return false only if the ** interrupt handler can't be installed to the ** VIC table ** *****************************************************************************/ uint32_t UARTInit( uint32_t PortNum, uint32_t baudrate ) { uint32_t Fdiv; uint32_t pclkdiv, pclk; if ( PortNum == 0 ) { LPC_PINCON->PINSEL0 &= ~0x000000F0; LPC_PINCON->PINSEL0 |= 0x00000050; /* RxD0 is P0.3 and TxD0 is P0.2 */ /* By default, the PCLKSELx value is zero, thus, the PCLK for all the peripherals is 1/4 of the SystemFrequency. */ /* Bit 6~7 is for UART0 */ pclkdiv = (LPC_SC->PCLKSEL0 >> 6) & 0x03; switch ( pclkdiv ) { case 0x00: default: pclk = SystemFrequency/4; break; case 0x01: pclk = SystemFrequency; break; case 0x02: pclk = SystemFrequency/2; break; case 0x03: pclk = SystemFrequency/8; break; } LPC_UART0->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ Fdiv = ( pclk / 16 ) / baudrate ; /*baud rate */ LPC_UART0->DLM = Fdiv / 256; LPC_UART0->DLL = Fdiv % 256; LPC_UART0->LCR = 0x03; /* DLAB = 0 */ LPC_UART0->FCR = 0x07; /* Enable and reset TX and RX FIFO. */ NVIC_EnableIRQ(UART0_IRQn); LPC_UART0->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART0 interrupt */ return (TRUE); } else if ( PortNum == 1 ) { LPC_PINCON->PINSEL4 &= ~0x0000000F; LPC_PINCON->PINSEL4 |= 0x0000000A; /* Enable RxD1 P2.1, TxD1 P2.0 */ /* By default, the PCLKSELx value is zero, thus, the PCLK for all the peripherals is 1/4 of the SystemFrequency. */ /* Bit 8,9 are for UART1 */ pclkdiv = (LPC_SC->PCLKSEL0 >> 8) & 0x03; switch ( pclkdiv ) { case 0x00: default: pclk = SystemFrequency/4; break; case 0x01: pclk = SystemFrequency; break; case 0x02: pclk = SystemFrequency/2; break; case 0x03: pclk = SystemFrequency/8; break; } LPC_UART1->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ Fdiv = ( pclk / 16 ) / baudrate ; /*baud rate */ LPC_UART1->DLM = Fdiv / 256; LPC_UART1->DLL = Fdiv % 256; LPC_UART1->LCR = 0x03; /* DLAB = 0 */ LPC_UART1->FCR = 0x07; /* Enable and reset TX and RX FIFO. */ NVIC_EnableIRQ(UART1_IRQn); LPC_UART1->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART1 interrupt */ return (TRUE); } return( FALSE ); }
Dear Friends
Thank for your replies. i have datasheet,usermanual,keil sample code etc see here i used UART based sensor. that datasheet was gave 4800 baud ,8data bytes,1stop bit for receive that values
first i tried in hyperterminal everything is fine i modify the keil receiver code. according to that LPC_UART0->LCR = 0xb8. i got data but that value was different compare than microcontroller