Work with UART (ASM) » History » Version 2
krufter_multiclet, 06/11/2013 05:08 PM
| 1 | 1 | krufter_multiclet | h1. Work with UART (ASM) |
|---|---|---|---|
| 2 | 1 | krufter_multiclet | |
| 3 | 1 | krufter_multiclet | Observe transmit and receive messages via UART more details(on Assembler). |
| 4 | 1 | krufter_multiclet | In code examples constant list is used, which need required with directive " .include " |
| 5 | 1 | krufter_multiclet | |
| 6 | 1 | krufter_multiclet | <pre> |
| 7 | 1 | krufter_multiclet | .include "HDL50001_pcf.inc" |
| 8 | 1 | krufter_multiclet | </pre> |
| 9 | 1 | krufter_multiclet | |
| 10 | 1 | krufter_multiclet | |
| 11 | 2 | krufter_multiclet | h2. а) Transmit via UART |
| 12 | 1 | krufter_multiclet | |
| 13 | 2 | krufter_multiclet | h3. 1. Allow alternative port functions. |
| 14 | 1 | krufter_multiclet | |
| 15 | 2 | krufter_multiclet | Now, produce two development kits, in which using UART0(HW1-MCp04) and UART3(LDM-MCp04). |
| 16 | 2 | krufter_multiclet | Observe assembler commands for allowance alternative port functions. |
| 17 | 2 | krufter_multiclet | For UART0: |
| 18 | 1 | krufter_multiclet | <pre> |
| 19 | 1 | krufter_multiclet | getl 0x00000F00 |
| 20 | 1 | krufter_multiclet | wrl @1, GPIOB_BPS |
| 21 | 1 | krufter_multiclet | </pre> |
| 22 | 1 | krufter_multiclet | |
| 23 | 2 | krufter_multiclet | For UART3: |
| 24 | 1 | krufter_multiclet | <pre> |
| 25 | 1 | krufter_multiclet | getl 0x00000F00 |
| 26 | 1 | krufter_multiclet | wrl @1, GPIOD_BPS |
| 27 | 1 | krufter_multiclet | </pre> |
| 28 | 1 | krufter_multiclet | |
| 29 | 1 | krufter_multiclet | h3. 2. Настраиваем UART на передачу, устанавливаем скорость работы. |
| 30 | 1 | krufter_multiclet | |
| 31 | 1 | krufter_multiclet | Для настройки UART на передачу запишем следующее значение в регистр управления: |
| 32 | 1 | krufter_multiclet | Для UART0: |
| 33 | 1 | krufter_multiclet | <pre> |
| 34 | 1 | krufter_multiclet | getl 0x00000002 |
| 35 | 1 | krufter_multiclet | wrl @1, UART0_CR |
| 36 | 1 | krufter_multiclet | </pre> |
| 37 | 1 | krufter_multiclet | |
| 38 | 1 | krufter_multiclet | Для UART3: |
| 39 | 1 | krufter_multiclet | <pre> |
| 40 | 1 | krufter_multiclet | getl 0x00000002 |
| 41 | 1 | krufter_multiclet | wrl @1, UART3_CR |
| 42 | 1 | krufter_multiclet | </pre> |
| 43 | 1 | krufter_multiclet | |
| 44 | 1 | krufter_multiclet | Для установки скорости используется коэффициент деления BRDIV = Fsys/(8*Fuart - 1) |
| 45 | 1 | krufter_multiclet | Для скорости 38400 кбит/с: |
| 46 | 1 | krufter_multiclet | |
| 47 | 1 | krufter_multiclet | Для UART0: |
| 48 | 1 | krufter_multiclet | <pre> |
| 49 | 1 | krufter_multiclet | getl 0x00000104 |
| 50 | 1 | krufter_multiclet | wrl @1, UART0_BDR |
| 51 | 1 | krufter_multiclet | </pre> |
| 52 | 1 | krufter_multiclet | |
| 53 | 1 | krufter_multiclet | Для UART3: |
| 54 | 1 | krufter_multiclet | <pre> |
| 55 | 1 | krufter_multiclet | getl 0x00000104 |
| 56 | 1 | krufter_multiclet | wrl @1, UART3_BDR |
| 57 | 1 | krufter_multiclet | </pre> |
| 58 | 1 | krufter_multiclet | |
| 59 | 1 | krufter_multiclet | h3. 3. Проверка буфера передатчика на полноту. |
| 60 | 1 | krufter_multiclet | |
| 61 | 1 | krufter_multiclet | Для UART0: |
| 62 | 1 | krufter_multiclet | <pre> |
| 63 | 1 | krufter_multiclet | fifo_tx_full: |
| 64 | 1 | krufter_multiclet | rdl UART0_ST |
| 65 | 1 | krufter_multiclet | getl 0x00000200 |
| 66 | 1 | krufter_multiclet | and @1, @2 |
| 67 | 1 | krufter_multiclet | je @1, fifo_tx_full |
| 68 | 1 | krufter_multiclet | jne @2, send_byte |
| 69 | 1 | krufter_multiclet | complete |
| 70 | 1 | krufter_multiclet | </pre> |
| 71 | 1 | krufter_multiclet | |
| 72 | 1 | krufter_multiclet | Для UART3: |
| 73 | 1 | krufter_multiclet | <pre> |
| 74 | 1 | krufter_multiclet | fifo_tx_full: |
| 75 | 1 | krufter_multiclet | rdl UART3_ST |
| 76 | 1 | krufter_multiclet | getl 0x00000200 |
| 77 | 1 | krufter_multiclet | and @1, @2 |
| 78 | 1 | krufter_multiclet | je @1, fifo_tx_full |
| 79 | 1 | krufter_multiclet | jne @2, send_byte |
| 80 | 1 | krufter_multiclet | complete |
| 81 | 1 | krufter_multiclet | </pre> |
| 82 | 1 | krufter_multiclet | |
| 83 | 1 | krufter_multiclet | |
| 84 | 1 | krufter_multiclet | h3. 4. Передача байта по UART. |
| 85 | 1 | krufter_multiclet | |
| 86 | 1 | krufter_multiclet | Для UART0: |
| 87 | 1 | krufter_multiclet | <pre> |
| 88 | 1 | krufter_multiclet | getb 0xAB |
| 89 | 1 | krufter_multiclet | wrb @1, UART0_DATA |
| 90 | 1 | krufter_multiclet | </pre> |
| 91 | 1 | krufter_multiclet | |
| 92 | 1 | krufter_multiclet | Для UART3: |
| 93 | 1 | krufter_multiclet | <pre> |
| 94 | 1 | krufter_multiclet | getb 0xAB |
| 95 | 1 | krufter_multiclet | wrb @1, UART3_DATA |
| 96 | 1 | krufter_multiclet | </pre> |
| 97 | 1 | krufter_multiclet | |
| 98 | 1 | krufter_multiclet | В результате можно получить простой пример по отправке байта по UART со скоростью 38400 Кбит/с: |
| 99 | 1 | krufter_multiclet | |
| 100 | 1 | krufter_multiclet | Для UART0: |
| 101 | 1 | krufter_multiclet | <pre> |
| 102 | 1 | krufter_multiclet | |
| 103 | 1 | krufter_multiclet | .include "HDL50001_pcf.inc" |
| 104 | 1 | krufter_multiclet | |
| 105 | 1 | krufter_multiclet | .text |
| 106 | 1 | krufter_multiclet | |
| 107 | 1 | krufter_multiclet | preset_UART0: |
| 108 | 1 | krufter_multiclet | getl 0x00000F00 |
| 109 | 1 | krufter_multiclet | wrl @1, GPIOB_BPS |
| 110 | 1 | krufter_multiclet | getl 0x00000104 |
| 111 | 1 | krufter_multiclet | wrl @1, UART0_BDR |
| 112 | 1 | krufter_multiclet | getl 0x00000002 |
| 113 | 1 | krufter_multiclet | wrl @1, UART0_CR |
| 114 | 1 | krufter_multiclet | jmp fifo_tx_full |
| 115 | 1 | krufter_multiclet | complete |
| 116 | 1 | krufter_multiclet | |
| 117 | 1 | krufter_multiclet | fifo_tx_full: |
| 118 | 1 | krufter_multiclet | rdl UART0_ST |
| 119 | 1 | krufter_multiclet | getl 0x00000200 |
| 120 | 1 | krufter_multiclet | and @1, @2 |
| 121 | 1 | krufter_multiclet | je @1, fifo_tx_full |
| 122 | 1 | krufter_multiclet | jne @2, paragraph |
| 123 | 1 | krufter_multiclet | complete |
| 124 | 1 | krufter_multiclet | |
| 125 | 1 | krufter_multiclet | send_byte: |
| 126 | 1 | krufter_multiclet | getb 0xAB |
| 127 | 1 | krufter_multiclet | wrb @1, UART0_DATA |
| 128 | 1 | krufter_multiclet | complete |
| 129 | 1 | krufter_multiclet | </pre> |
| 130 | 1 | krufter_multiclet | |
| 131 | 1 | krufter_multiclet | Для UART3 всё будет аналогично. Ознакомиться с другими примерами работы с UART можно в Хранилище, интересующие вопросы по всем интерфейсам можно задать на форуме. |
| 132 | 1 | krufter_multiclet | |
| 133 | 1 | krufter_multiclet | h2. б) Приём по UART |
| 134 | 1 | krufter_multiclet | |
| 135 | 1 | krufter_multiclet | Для приёма байта по UART необходимо: |
| 136 | 1 | krufter_multiclet | |
| 137 | 1 | krufter_multiclet | h3. 1. Разрешить алтернативные функции портов (аналогично пункту 1 в "передаче") |
| 138 | 1 | krufter_multiclet | |
| 139 | 1 | krufter_multiclet | h3. 2. Настраиваем UART на приём, устанавливаем скорость работы. |
| 140 | 1 | krufter_multiclet | |
| 141 | 1 | krufter_multiclet | Для настройки UART на передачу запишем следующее значение в регистр управления: |
| 142 | 1 | krufter_multiclet | Для UART0: |
| 143 | 1 | krufter_multiclet | <pre> |
| 144 | 1 | krufter_multiclet | getl 0x00000001 |
| 145 | 1 | krufter_multiclet | wrl @1, UART0_CR |
| 146 | 1 | krufter_multiclet | </pre> |
| 147 | 1 | krufter_multiclet | |
| 148 | 1 | krufter_multiclet | Для UART3: |
| 149 | 1 | krufter_multiclet | <pre> |
| 150 | 1 | krufter_multiclet | getl 0x00000001 |
| 151 | 1 | krufter_multiclet | wrl @1, UART3_CR |
| 152 | 1 | krufter_multiclet | </pre> |
| 153 | 1 | krufter_multiclet | |
| 154 | 1 | krufter_multiclet | Настройка скорости работы аналогично пункту 2 в "передаче". |
| 155 | 1 | krufter_multiclet | |
| 156 | 1 | krufter_multiclet | h3. 3. Проверить наличие новых данных в буфере приёма |
| 157 | 1 | krufter_multiclet | |
| 158 | 1 | krufter_multiclet | Для UART0: |
| 159 | 1 | krufter_multiclet | <pre> |
| 160 | 1 | krufter_multiclet | fifo_rx_newb: |
| 161 | 1 | krufter_multiclet | rdl UART0_ST |
| 162 | 1 | krufter_multiclet | getl 0x00000001 |
| 163 | 1 | krufter_multiclet | and @1, @2 |
| 164 | 1 | krufter_multiclet | je @1, fifo_rx_newb |
| 165 | 1 | krufter_multiclet | jne @2, get_byte |
| 166 | 1 | krufter_multiclet | complete |
| 167 | 1 | krufter_multiclet | </pre> |
| 168 | 1 | krufter_multiclet | |
| 169 | 1 | krufter_multiclet | Для UART3: |
| 170 | 1 | krufter_multiclet | <pre> |
| 171 | 1 | krufter_multiclet | fifo_rx_newb: |
| 172 | 1 | krufter_multiclet | rdl UART3_ST |
| 173 | 1 | krufter_multiclet | getl 0x00000001 |
| 174 | 1 | krufter_multiclet | and @1, @2 |
| 175 | 1 | krufter_multiclet | je @1, fifo_rx_newb |
| 176 | 1 | krufter_multiclet | jne @2, get_byte |
| 177 | 1 | krufter_multiclet | complete |
| 178 | 1 | krufter_multiclet | </pre> |
| 179 | 1 | krufter_multiclet | |
| 180 | 1 | krufter_multiclet | h3. 4. Принять байт |
| 181 | 1 | krufter_multiclet | |
| 182 | 1 | krufter_multiclet | Для UART0: |
| 183 | 1 | krufter_multiclet | <pre> |
| 184 | 1 | krufter_multiclet | rdl UART0_DATA |
| 185 | 1 | krufter_multiclet | </pre> |
| 186 | 1 | krufter_multiclet | |
| 187 | 1 | krufter_multiclet | Для UART3: |
| 188 | 1 | krufter_multiclet | <pre> |
| 189 | 1 | krufter_multiclet | rdl UART3_DATA |
| 190 | 1 | krufter_multiclet | </pre> |