1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/****************************************************************************
* $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.
****************************************************************************/
#include "uart.h"
#include <LPC17xx.h>
#include <stdint.h>
#define IER_RBR 0x01
#define IER_THRE 0x02
#define IER_RLS 0x04
#define IIR_PEND 0x01
#define IIR_RLS 0x03
#define IIR_RDA 0x02
#define IIR_CTI 0x06
#define IIR_THRE 0x01
#define LSR_RDR 0x01
#define LSR_OE 0x02
#define LSR_PE 0x04
#define LSR_FE 0x08
#define LSR_BI 0x10
#define LSR_THRE 0x20
#define LSR_TEMT 0x40
#define LSR_RXFE 0x80
#define BUFSIZE 0x40
#define TRUE 1
#define FALSE 0
volatile uint32_t UART0Status, UART1Status;
volatile uint8_t UART0TxEmpty = 1, UART1TxEmpty = 1;
/*****************************************************************************
** 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 uart_init( uint32_t PortNum, uint32_t baudrate )
{
uint32_t Fdiv;
uint32_t pclkdiv, pclk;
SystemCoreClockUpdate();
uint32_t SystemFrequency = SystemCoreClock;
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 = 0b111; /* 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 );
}
/*****************************************************************************
** Function name: UARTSend
**
** Descriptions: Send a block of data to the UART 0 port based
** on the data length
**
** parameters: portNum, buffer pointer, and data length
** Returned value: None
**
*****************************************************************************/
void uart_send( uint32_t portNum, const char *BufferPtr, uint32_t Length )
{
//unsigned int *U0LSR = (unsigned int *)0x4000C014;
if(portNum == 0) {
while(Length != 0) {
/* THRE status, contain valid data */
//while ( !(UART0TxEmpty & 0x01) );
// while(((*U0LSR) & 0b100000) != 0);
while((LPC_UART0->LSR & 0b100000) == 0);
LPC_UART0->THR = *BufferPtr;
UART0TxEmpty = 0; /* not empty in the THR until it shifts out */
BufferPtr++;
Length--;
}
} else {
while ( Length != 0 )
{
/* THRE status, contain valid data */
while ( !(UART1TxEmpty & 0x01) );
LPC_UART1->THR = *BufferPtr;
UART1TxEmpty = 0; /* not empty in the THR until it shifts out */
BufferPtr++;
Length--;
}
}
return;
}
void uart_receive(uint32_t portNum, char *BufferPtr, uint32_t Length)
{
if(portNum == 0) {
while(Length != 0) {
/* THRE status, contain valid data */
//while ( !(UART0TxEmpty & 0x01) );
// while(((*U0LSR) & 0b100000) != 0);
while((LPC_UART0->LSR & 0b1) == 0);
*BufferPtr = LPC_UART0->RBR;
BufferPtr++;
Length--;
}
} else {
/*
while ( Length != 0 )
{
while ( !(UART1TxEmpty & 0x01) );
LPC_UART1->THR = *BufferPtr;
UART1TxEmpty = 0; // not empty in the THR until it shifts out
BufferPtr++;
Length--;
}
*/
}
return;
}
/******************************************************************************
** End Of File
******************************************************************************/
|
