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uart_8xx.c
Go to the documentation of this file.
1 /*
2 * @brief LPC8xx UART driver
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licenser disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "chip.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /*****************************************************************************
39 * Public types/enumerations/variables
40 ****************************************************************************/
41
42 /*****************************************************************************
43 * Private functions
44 ****************************************************************************/
45
46 /*****************************************************************************
47 * Public functions
48 ****************************************************************************/
49
50 /* Initialize the UART peripheral */
51 void Chip_UART_Init(LPC_USART_T *pUART)
52 {
53 /* Clear the interrupt */
54 IP_UART_ClearStatus(pUART, CTS_DELTA | DELTA_RXBRK);
55
56 /* Enable the UART */
57 IP_UART_Init(pUART);
58 }
59
60 /* Set baud rate for UART */
61 void Chip_UART_SetBaudRate(LPC_USART_T *pUART, uint32_t baudrate)
62 {
63 uint32_t err, uart_fra_multiplier, baudRateGenerator;
64 uint32_t systemCoreClock = Chip_Clock_GetMainClockRate();
65
66 /* Calculate baudrate generator value */
67 baudRateGenerator = systemCoreClock / (16 * baudrate);
68 err = systemCoreClock - baudRateGenerator * 16 * baudrate;
69 uart_fra_multiplier = (err * 0xFF) / (baudRateGenerator * 16 * baudrate);
70 IP_UART_SetBaudRate(pUART, baudRateGenerator - 1); /*baud rate */
71 Chip_SYSCTL_SetUSARTFRGDivider(0xFF); /* value 0xFF is always used */
72 Chip_SYSCTL_SetUSARTFRGMultiplier(uart_fra_multiplier);
73 }
74
75 /* Transmit a 8 bits data */
76 Status Chip_UART_SendByte(LPC_USART_T *pUART, uint8_t data)
77 {
78 if (IP_UART_GetStatus(pUART) & (TXRDY)) {
79 IP_UART_Transmit(pUART, data);
80 return SUCCESS;
81 }
82 return ERROR;
83 }
84
85 /* Receive a 8 bits data */
86 Status Chip_UART_ReceiveByte(LPC_USART_T *pUART, uint8_t *Data)
87 {
88 if (IP_UART_GetStatus(pUART) & (RXRDY)) {
89 *Data = IP_UART_Receive(pUART);
90 return SUCCESS;
91 }
92 return ERROR;
93 }