libpynq (release 5EWC0-2023 version 0.2.2 of 2023-09-24 22:22)
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uart.c
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1/*
2Copyright (c) 2023 Eindhoven University of Technology
3
4Permission is hereby granted, free of charge, to any person obtaining a copy
5of this software and associated documentation files (the "Software"), to deal
6in the Software without restriction, including without limitation the rights
7to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8copies of the Software, and to permit persons to whom the Software is
9furnished to do so, subject to the following conditions:
10
11The above copyright notice and this permission notice shall be included in all
12copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20SOFTWARE.
21*/
22#include "uart.h"
24#include "log.h"
25#include <platform.h>
26#include <stdio.h>
27
28#define UART_REG_RECEIVE_FIFO 0
29#define UART_REG_TRANSMIT_FIFO 1
30#define UART_REG_STATUS 2
31#define UART_REG_CONTROL 3
32
33#define UART_REG_STATUS_BIT_RX_FIFO_HAS_DATA 1
34#define UART_REG_STATUS_BIT_RX_FIFO_FULL 2
35#define UART_REG_STATUS_BIT_TX_FIFO_EMPTY 4
36#define UART_REG_STATUS_BIT_TX_FIFO_FULL 8
37
38#define UART_REG_CONTROL_BIT_CLEAR_TX_FIFO 1
39#define UART_REG_CONTROL_BIT_CLEAR_RX_FIFO 2
40#define UART_REG_CONTROL_BIT_CLEAR_FIFOS \
41 (UART_REG_CONTROL_BIT_CLEAR_RX_FIFO | UART_REG_CONTROL_BIT_CLEAR_TX_FIFO)
42
43static arm_shared uart_handles[NUM_UARTS];
44static volatile uint32_t *uart_ptrs[NUM_UARTS] = {
45 NULL,
46};
47
48void uart_init(const int uart) {
49 if (!(uart >= UART0 && uart < NUM_UARTS)) {
50 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
51 }
52 if (uart == UART0) {
53 uart_ptrs[uart] =
54 arm_shared_init(&(uart_handles[uart]), axi_uartlite_0, 4096);
55 } else if (uart == UART1) {
56 uart_ptrs[uart] =
57 arm_shared_init(&(uart_handles[uart]), axi_uartlite_1, 4096);
58 }
59}
60
61void uart_destroy(const int uart) {
62 if (!(uart >= UART0 && uart < NUM_UARTS)) {
63 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
64 }
65 if (uart_ptrs[uart] == NULL) {
66 pynq_error("UART%d has not been initialized.\n", uart);
67 }
68 arm_shared_close(&(uart_handles[uart]));
69 uart_ptrs[uart] = NULL;
70}
71
72void uart_send(const int uart, const uint8_t data) {
73 if (!(uart >= UART0 && uart < NUM_UARTS)) {
74 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
75 }
76 if (uart_ptrs[uart] == NULL) {
77 pynq_error("UART%d has not been initialized.\n", uart);
78 }
79 while ((uart_ptrs[uart][UART_REG_STATUS] &
81 ;
82 uart_ptrs[uart][UART_REG_TRANSMIT_FIFO] = data;
83}
84
85uint8_t uart_recv(const int uart) {
86 if (!(uart >= UART0 && uart < NUM_UARTS)) {
87 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
88 }
89 if (uart_ptrs[uart] == NULL) {
90 pynq_error("UART%d has not been initialized.\n", uart);
91 }
92 while ((uart_ptrs[uart][UART_REG_STATUS] &
94 }
95 return uart_ptrs[uart][UART_REG_RECEIVE_FIFO];
96}
97
98bool uart_has_data(const int uart) {
99 if (!(uart >= UART0 && uart < NUM_UARTS)) {
100 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
101 }
102 if (uart_ptrs[uart] == NULL) {
103 pynq_error("UART%d has not been initialized.\n", uart);
104 }
105 return ((uart_ptrs[uart][UART_REG_STATUS] &
108}
109
110bool uart_has_space(const int uart) {
111 if (!(uart >= UART0 && uart < NUM_UARTS)) {
112 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
113 }
114 if (uart_ptrs[uart] == NULL) {
115 pynq_error("UART%d has not been initialized.\n", uart);
116 }
117 return ((uart_ptrs[uart][UART_REG_STATUS] &
119}
120
121void uart_reset_fifos(const int uart) {
122 if (!(uart >= UART0 && uart < NUM_UARTS)) {
123 pynq_error("invalid UART %d, must be 0..%d-1\n", uart, NUM_UARTS);
124 }
125 if (uart_ptrs[uart] == NULL) {
126 pynq_error("UART%d has not been initialized.\n", uart);
127 }
129}
void arm_shared_close(arm_shared *handle)
void * arm_shared_init(arm_shared *handle, const uint32_t address, const uint32_t length)
#define pynq_error(...)
Definition log.h:118
void uart_destroy(const int uart)
Close the shared memory handle for the specified UART index.
Definition uart.c:61
void uart_reset_fifos(const int uart)
This function resets both the transmit and receive FIFOs of the UART specified by the uart parameter....
Definition uart.c:121
bool uart_has_data(const int uart)
Check if the receive FIFO for the specified UART index has data available.
Definition uart.c:98
bool uart_has_space(const int uart)
Check if the transmit FIFO for the specified UART index has space available.
Definition uart.c:110
uint8_t uart_recv(const int uart)
Receive a byte of data from the specified UART index by waiting for the receive FIFO to have data and...
Definition uart.c:85
void uart_send(const int uart, const uint8_t data)
Send a byte of data on the specified UART index by waiting for the transmit FIFO to have space and th...
Definition uart.c:72
void uart_init(const int uart)
Initialize the UART specified by the index with a shared memory handle and a buffer size of 4096 byte...
Definition uart.c:48
@ NUM_UARTS
Definition uart.h:107
@ UART0
Definition uart.h:107
@ UART1
Definition uart.h:107
#define UART_REG_STATUS_BIT_RX_FIFO_HAS_DATA
Definition uart.c:33
#define UART_REG_CONTROL
Definition uart.c:31
#define UART_REG_CONTROL_BIT_CLEAR_FIFOS
Definition uart.c:40
#define UART_REG_STATUS
Definition uart.c:30
#define UART_REG_RECEIVE_FIFO
Definition uart.c:28
#define UART_REG_STATUS_BIT_TX_FIFO_FULL
Definition uart.c:36
#define UART_REG_TRANSMIT_FIFO
Definition uart.c:29