Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NXP/TARGET_LPC11U6X/serial_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16
elessair 0:f269e3021894 17 // math.h required for floating point operations for baud rate calculation
elessair 0:f269e3021894 18 #include "mbed_assert.h"
elessair 0:f269e3021894 19 #include <math.h>
elessair 0:f269e3021894 20 #include <string.h>
elessair 0:f269e3021894 21 #include <stdlib.h>
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 #include "serial_api.h"
elessair 0:f269e3021894 24 #include "cmsis.h"
elessair 0:f269e3021894 25 #include "pinmap.h"
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 #if DEVICE_SERIAL
elessair 0:f269e3021894 28
elessair 0:f269e3021894 29 /******************************************************************************
elessair 0:f269e3021894 30 * INITIALIZATION
elessair 0:f269e3021894 31 ******************************************************************************/
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #define UART_NUM 5
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 // CFG
elessair 0:f269e3021894 36 #define UART_EN (0x01<<0)
elessair 0:f269e3021894 37
elessair 0:f269e3021894 38 // CTL
elessair 0:f269e3021894 39 #define TXBRKEN (0x01<<1)
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 // STAT
elessair 0:f269e3021894 42 #define RXRDY (0x01<<0)
elessair 0:f269e3021894 43 #define TXRDY (0x01<<2)
elessair 0:f269e3021894 44 #define DELTACTS (0x01<<5)
elessair 0:f269e3021894 45 #define RXBRK (0x01<<10)
elessair 0:f269e3021894 46 #define DELTARXBRK (0x01<<11)
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48 static const PinMap PinMap_UART_TX[] = {
elessair 0:f269e3021894 49 {P0_19, UART_0, 1},
elessair 0:f269e3021894 50 {P1_18, UART_0, 2},
elessair 0:f269e3021894 51 {P1_27, UART_0, 2},
elessair 0:f269e3021894 52 {P1_8 , UART_1, 2},
elessair 0:f269e3021894 53 {P0_14, UART_1, 4},
elessair 0:f269e3021894 54 {P1_0 , UART_2, 3},
elessair 0:f269e3021894 55 {P1_23, UART_2, 3},
elessair 0:f269e3021894 56 {P2_4 , UART_3, 1},
elessair 0:f269e3021894 57 {P2_12, UART_4, 1},
elessair 0:f269e3021894 58 { NC , NC , 0}
elessair 0:f269e3021894 59 };
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 static const PinMap PinMap_UART_RX[] = {
elessair 0:f269e3021894 62 {P0_18, UART_0, 1},
elessair 0:f269e3021894 63 {P1_17, UART_0, 2},
elessair 0:f269e3021894 64 {P1_26, UART_0, 2},
elessair 0:f269e3021894 65 {P1_2 , UART_1, 3},
elessair 0:f269e3021894 66 {P0_13, UART_1, 4},
elessair 0:f269e3021894 67 {P0_20, UART_2, 2},
elessair 0:f269e3021894 68 {P1_6 , UART_2, 2},
elessair 0:f269e3021894 69 {P2_3 , UART_3, 1},
elessair 0:f269e3021894 70 {P2_11, UART_4, 1},
elessair 0:f269e3021894 71 {NC , NC , 0}
elessair 0:f269e3021894 72 };
elessair 0:f269e3021894 73
elessair 0:f269e3021894 74 static uint32_t serial_irq_ids[UART_NUM] = {0};
elessair 0:f269e3021894 75 static uart_irq_handler irq_handler;
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 int stdio_uart_inited = 0;
elessair 0:f269e3021894 78 serial_t stdio_uart;
elessair 0:f269e3021894 79
elessair 0:f269e3021894 80 void serial_init(serial_t *obj, PinName tx, PinName rx) {
elessair 0:f269e3021894 81 int is_stdio_uart = 0;
elessair 0:f269e3021894 82
elessair 0:f269e3021894 83 // determine the UART to use
elessair 0:f269e3021894 84 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
elessair 0:f269e3021894 85 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
elessair 0:f269e3021894 86 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
elessair 0:f269e3021894 87 MBED_ASSERT((int)uart != NC);
elessair 0:f269e3021894 88
elessair 0:f269e3021894 89 switch (uart) {
elessair 0:f269e3021894 90 case UART_0:
elessair 0:f269e3021894 91 obj->index = 0;
elessair 0:f269e3021894 92 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 12);
elessair 0:f269e3021894 93 break;
elessair 0:f269e3021894 94 case UART_1:
elessair 0:f269e3021894 95 obj->index = 1;
elessair 0:f269e3021894 96 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 20);
elessair 0:f269e3021894 97 LPC_SYSCON->PRESETCTRL |= (1 << 5);
elessair 0:f269e3021894 98 break;
elessair 0:f269e3021894 99 case UART_2:
elessair 0:f269e3021894 100 obj->index = 2;
elessair 0:f269e3021894 101 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 21);
elessair 0:f269e3021894 102 LPC_SYSCON->PRESETCTRL |= (1 << 6);
elessair 0:f269e3021894 103 break;
elessair 0:f269e3021894 104 case UART_3:
elessair 0:f269e3021894 105 obj->index = 3;
elessair 0:f269e3021894 106 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
elessair 0:f269e3021894 107 LPC_SYSCON->PRESETCTRL |= (1 << 7);
elessair 0:f269e3021894 108 break;
elessair 0:f269e3021894 109 case UART_4:
elessair 0:f269e3021894 110 obj->index = 4;
elessair 0:f269e3021894 111 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 22);
elessair 0:f269e3021894 112 LPC_SYSCON->PRESETCTRL |= (1 << 8);
elessair 0:f269e3021894 113 break;
elessair 0:f269e3021894 114 }
elessair 0:f269e3021894 115
elessair 0:f269e3021894 116 if (obj->index == 0)
elessair 0:f269e3021894 117 obj->uart = (LPC_USART0_Type *)uart;
elessair 0:f269e3021894 118 else
elessair 0:f269e3021894 119 obj->mini_uart = (LPC_USART4_Type *)uart;
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 if (obj->index == 0) {
elessair 0:f269e3021894 122 // enable fifos and default rx trigger level
elessair 0:f269e3021894 123 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
elessair 0:f269e3021894 124 | 0 << 1 // Rx Fifo Clear
elessair 0:f269e3021894 125 | 0 << 2 // Tx Fifo Clear
elessair 0:f269e3021894 126 | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
elessair 0:f269e3021894 127 // disable irqs
elessair 0:f269e3021894 128 obj->uart->IER = 0 << 0 // Rx Data available irq enable
elessair 0:f269e3021894 129 | 0 << 1 // Tx Fifo empty irq enable
elessair 0:f269e3021894 130 | 0 << 2; // Rx Line Status irq enable
elessair 0:f269e3021894 131 }
elessair 0:f269e3021894 132 else {
elessair 0:f269e3021894 133 // Clear all status bits
elessair 0:f269e3021894 134 obj->mini_uart->STAT = (DELTACTS | DELTARXBRK);
elessair 0:f269e3021894 135 // Enable UART
elessair 0:f269e3021894 136 obj->mini_uart->CFG |= UART_EN;
elessair 0:f269e3021894 137 }
elessair 0:f269e3021894 138 // set default baud rate and format
elessair 0:f269e3021894 139 serial_baud (obj, 9600);
elessair 0:f269e3021894 140 serial_format(obj, 8, ParityNone, 1);
elessair 0:f269e3021894 141
elessair 0:f269e3021894 142 // pinout the chosen uart
elessair 0:f269e3021894 143 pinmap_pinout(tx, PinMap_UART_TX);
elessair 0:f269e3021894 144 pinmap_pinout(rx, PinMap_UART_RX);
elessair 0:f269e3021894 145
elessair 0:f269e3021894 146 // set rx/tx pins in PullUp mode
elessair 0:f269e3021894 147 if (tx != NC) {
elessair 0:f269e3021894 148 pin_mode(tx, PullUp);
elessair 0:f269e3021894 149 }
elessair 0:f269e3021894 150 if (rx != NC) {
elessair 0:f269e3021894 151 pin_mode(rx, PullUp);
elessair 0:f269e3021894 152 }
elessair 0:f269e3021894 153
elessair 0:f269e3021894 154 is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
elessair 0:f269e3021894 155
elessair 0:f269e3021894 156 if (is_stdio_uart && (obj->index == 0)) {
elessair 0:f269e3021894 157 stdio_uart_inited = 1;
elessair 0:f269e3021894 158 memcpy(&stdio_uart, obj, sizeof(serial_t));
elessair 0:f269e3021894 159 }
elessair 0:f269e3021894 160 }
elessair 0:f269e3021894 161
elessair 0:f269e3021894 162 void serial_free(serial_t *obj) {
elessair 0:f269e3021894 163 serial_irq_ids[obj->index] = 0;
elessair 0:f269e3021894 164 }
elessair 0:f269e3021894 165
elessair 0:f269e3021894 166 // serial_baud
elessair 0:f269e3021894 167 // set the baud rate, taking in to account the current SystemFrequency
elessair 0:f269e3021894 168 void serial_baud(serial_t *obj, int baudrate) {
elessair 0:f269e3021894 169 LPC_SYSCON->USART0CLKDIV = 1;
elessair 0:f269e3021894 170 LPC_SYSCON->FRGCLKDIV = 1;
elessair 0:f269e3021894 171
elessair 0:f269e3021894 172 if (obj->index == 0) {
elessair 0:f269e3021894 173 uint32_t PCLK = SystemCoreClock;
elessair 0:f269e3021894 174 // First we check to see if the basic divide with no DivAddVal/MulVal
elessair 0:f269e3021894 175 // ratio gives us an integer result. If it does, we set DivAddVal = 0,
elessair 0:f269e3021894 176 // MulVal = 1. Otherwise, we search the valid ratio value range to find
elessair 0:f269e3021894 177 // the closest match. This could be more elegant, using search methods
elessair 0:f269e3021894 178 // and/or lookup tables, but the brute force method is not that much
elessair 0:f269e3021894 179 // slower, and is more maintainable.
elessair 0:f269e3021894 180 uint16_t DL = PCLK / (16 * baudrate);
elessair 0:f269e3021894 181
elessair 0:f269e3021894 182 uint8_t DivAddVal = 0;
elessair 0:f269e3021894 183 uint8_t MulVal = 1;
elessair 0:f269e3021894 184 int hit = 0;
elessair 0:f269e3021894 185 uint16_t dlv;
elessair 0:f269e3021894 186 uint8_t mv, dav;
elessair 0:f269e3021894 187 if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
elessair 0:f269e3021894 188 int err_best = baudrate, b;
elessair 0:f269e3021894 189 for (mv = 1; mv < 16 && !hit; mv++)
elessair 0:f269e3021894 190 {
elessair 0:f269e3021894 191 for (dav = 0; dav < mv; dav++)
elessair 0:f269e3021894 192 {
elessair 0:f269e3021894 193 // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
elessair 0:f269e3021894 194 // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
elessair 0:f269e3021894 195 // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
elessair 0:f269e3021894 196 // for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
elessair 0:f269e3021894 197 // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
elessair 0:f269e3021894 198
elessair 0:f269e3021894 199 if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
elessair 0:f269e3021894 200 dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
elessair 0:f269e3021894 201 else // 2 bits headroom, use more precision
elessair 0:f269e3021894 202 dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
elessair 0:f269e3021894 203
elessair 0:f269e3021894 204 // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
elessair 0:f269e3021894 205 if (dlv == 0)
elessair 0:f269e3021894 206 dlv = 1;
elessair 0:f269e3021894 207
elessair 0:f269e3021894 208 // datasheet says if dav > 0 then DL must be >= 2
elessair 0:f269e3021894 209 if ((dav > 0) && (dlv < 2))
elessair 0:f269e3021894 210 dlv = 2;
elessair 0:f269e3021894 211
elessair 0:f269e3021894 212 // integer rearrangement of the baudrate equation (with rounding)
elessair 0:f269e3021894 213 b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
elessair 0:f269e3021894 214
elessair 0:f269e3021894 215 // check to see how we went
elessair 0:f269e3021894 216 b = abs(b - baudrate);
elessair 0:f269e3021894 217 if (b < err_best)
elessair 0:f269e3021894 218 {
elessair 0:f269e3021894 219 err_best = b;
elessair 0:f269e3021894 220
elessair 0:f269e3021894 221 DL = dlv;
elessair 0:f269e3021894 222 MulVal = mv;
elessair 0:f269e3021894 223 DivAddVal = dav;
elessair 0:f269e3021894 224
elessair 0:f269e3021894 225 if (b == baudrate)
elessair 0:f269e3021894 226 {
elessair 0:f269e3021894 227 hit = 1;
elessair 0:f269e3021894 228 break;
elessair 0:f269e3021894 229 }
elessair 0:f269e3021894 230 }
elessair 0:f269e3021894 231 }
elessair 0:f269e3021894 232 }
elessair 0:f269e3021894 233 }
elessair 0:f269e3021894 234
elessair 0:f269e3021894 235 // set LCR[DLAB] to enable writing to divider registers
elessair 0:f269e3021894 236 obj->uart->LCR |= (1 << 7);
elessair 0:f269e3021894 237
elessair 0:f269e3021894 238 // set divider values
elessair 0:f269e3021894 239 obj->uart->DLM = (DL >> 8) & 0xFF;
elessair 0:f269e3021894 240 obj->uart->DLL = (DL >> 0) & 0xFF;
elessair 0:f269e3021894 241 obj->uart->FDR = (uint32_t) DivAddVal << 0
elessair 0:f269e3021894 242 | (uint32_t) MulVal << 4;
elessair 0:f269e3021894 243
elessair 0:f269e3021894 244 // clear LCR[DLAB]
elessair 0:f269e3021894 245 obj->uart->LCR &= ~(1 << 7);
elessair 0:f269e3021894 246 }
elessair 0:f269e3021894 247 else {
elessair 0:f269e3021894 248 uint32_t UARTSysClk = SystemCoreClock / LPC_SYSCON->FRGCLKDIV;
elessair 0:f269e3021894 249 obj->mini_uart->BRG = UARTSysClk / 16 / baudrate - 1;
elessair 0:f269e3021894 250
elessair 0:f269e3021894 251 LPC_SYSCON->UARTFRGDIV = 0xFF;
elessair 0:f269e3021894 252 LPC_SYSCON->UARTFRGMULT = ( ((UARTSysClk / 16) * (LPC_SYSCON->UARTFRGDIV + 1)) /
elessair 0:f269e3021894 253 (baudrate * (obj->mini_uart->BRG + 1))
elessair 0:f269e3021894 254 ) - (LPC_SYSCON->UARTFRGDIV + 1);
elessair 0:f269e3021894 255 }
elessair 0:f269e3021894 256 }
elessair 0:f269e3021894 257
elessair 0:f269e3021894 258 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
elessair 0:f269e3021894 259 MBED_ASSERT((stop_bits == 1) || (stop_bits == 2)); // 0: 1 stop bits, 1: 2 stop bits
elessair 0:f269e3021894 260
elessair 0:f269e3021894 261 stop_bits -= 1;
elessair 0:f269e3021894 262
elessair 0:f269e3021894 263 if (obj->index == 0) {
elessair 0:f269e3021894 264 MBED_ASSERT((data_bits > 4) && (data_bits < 9)); // 0: 5 data bits ... 3: 8 data bits
elessair 0:f269e3021894 265 MBED_ASSERT((parity == ParityNone) || (parity == ParityOdd) || (parity == ParityEven) ||
elessair 0:f269e3021894 266 (parity == ParityForced1) || (parity == ParityForced0));
elessair 0:f269e3021894 267 data_bits -= 5;
elessair 0:f269e3021894 268
elessair 0:f269e3021894 269 int parity_enable, parity_select;
elessair 0:f269e3021894 270 switch (parity) {
elessair 0:f269e3021894 271 case ParityNone: parity_enable = 0; parity_select = 0; break;
elessair 0:f269e3021894 272 case ParityOdd : parity_enable = 1; parity_select = 0; break;
elessair 0:f269e3021894 273 case ParityEven: parity_enable = 1; parity_select = 1; break;
elessair 0:f269e3021894 274 case ParityForced1: parity_enable = 1; parity_select = 2; break;
elessair 0:f269e3021894 275 case ParityForced0: parity_enable = 1; parity_select = 3; break;
elessair 0:f269e3021894 276 default:
elessair 0:f269e3021894 277 return;
elessair 0:f269e3021894 278 }
elessair 0:f269e3021894 279
elessair 0:f269e3021894 280 obj->uart->LCR = data_bits << 0
elessair 0:f269e3021894 281 | stop_bits << 2
elessair 0:f269e3021894 282 | parity_enable << 3
elessair 0:f269e3021894 283 | parity_select << 4;
elessair 0:f269e3021894 284 }
elessair 0:f269e3021894 285 else {
elessair 0:f269e3021894 286 // 0: 7 data bits ... 2: 9 data bits
elessair 0:f269e3021894 287 MBED_ASSERT((data_bits > 6) && (data_bits < 10));
elessair 0:f269e3021894 288 MBED_ASSERT((parity == ParityNone) || (parity == ParityOdd) || (parity == ParityEven));
elessair 0:f269e3021894 289 data_bits -= 7;
elessair 0:f269e3021894 290
elessair 0:f269e3021894 291 int paritysel;
elessair 0:f269e3021894 292 switch (parity) {
elessair 0:f269e3021894 293 case ParityNone: paritysel = 0; break;
elessair 0:f269e3021894 294 case ParityEven: paritysel = 2; break;
elessair 0:f269e3021894 295 case ParityOdd : paritysel = 3; break;
elessair 0:f269e3021894 296 default:
elessair 0:f269e3021894 297 return;
elessair 0:f269e3021894 298 }
elessair 0:f269e3021894 299 obj->mini_uart->CFG = (data_bits << 2)
elessair 0:f269e3021894 300 | (paritysel << 4)
elessair 0:f269e3021894 301 | (stop_bits << 6)
elessair 0:f269e3021894 302 | UART_EN;
elessair 0:f269e3021894 303 }
elessair 0:f269e3021894 304 }
elessair 0:f269e3021894 305
elessair 0:f269e3021894 306 /******************************************************************************
elessair 0:f269e3021894 307 * INTERRUPTS HANDLING
elessair 0:f269e3021894 308 ******************************************************************************/
elessair 0:f269e3021894 309 static inline void uart_irq(uint32_t iir, uint32_t index) {
elessair 0:f269e3021894 310 SerialIrq irq_type;
elessair 0:f269e3021894 311 switch (iir) {
elessair 0:f269e3021894 312 case 1: irq_type = TxIrq; break;
elessair 0:f269e3021894 313 case 2: irq_type = RxIrq; break;
elessair 0:f269e3021894 314 default: return;
elessair 0:f269e3021894 315 }
elessair 0:f269e3021894 316
elessair 0:f269e3021894 317 if (serial_irq_ids[index] != 0)
elessair 0:f269e3021894 318 irq_handler(serial_irq_ids[index], irq_type);
elessair 0:f269e3021894 319 }
elessair 0:f269e3021894 320
elessair 0:f269e3021894 321 void uart0_irq()
elessair 0:f269e3021894 322 {
elessair 0:f269e3021894 323 uart_irq((LPC_USART0->IIR >> 1) & 0x7, 0);
elessair 0:f269e3021894 324 }
elessair 0:f269e3021894 325
elessair 0:f269e3021894 326 void uart1_irq()
elessair 0:f269e3021894 327 {
elessair 0:f269e3021894 328 if(LPC_USART1->STAT & (1 << 2)){
elessair 0:f269e3021894 329 uart_irq(1, 1);
elessair 0:f269e3021894 330 }
elessair 0:f269e3021894 331 if(LPC_USART1->STAT & (1 << 0)){
elessair 0:f269e3021894 332 uart_irq(2, 1);
elessair 0:f269e3021894 333 }
elessair 0:f269e3021894 334 }
elessair 0:f269e3021894 335
elessair 0:f269e3021894 336 void uart2_irq()
elessair 0:f269e3021894 337 {
elessair 0:f269e3021894 338 if(LPC_USART2->STAT & (1 << 2)){
elessair 0:f269e3021894 339 uart_irq(1, 2);
elessair 0:f269e3021894 340 }
elessair 0:f269e3021894 341 if(LPC_USART2->STAT & (1 << 0)){
elessair 0:f269e3021894 342 uart_irq(2, 2);
elessair 0:f269e3021894 343 }
elessair 0:f269e3021894 344 }
elessair 0:f269e3021894 345
elessair 0:f269e3021894 346 void uart3_irq()
elessair 0:f269e3021894 347 {
elessair 0:f269e3021894 348 if(LPC_USART3->STAT & (1 << 2)){
elessair 0:f269e3021894 349 uart_irq(1, 3);
elessair 0:f269e3021894 350 }
elessair 0:f269e3021894 351 if(LPC_USART3->STAT & (1 << 0)){
elessair 0:f269e3021894 352 uart_irq(2, 3);
elessair 0:f269e3021894 353 }
elessair 0:f269e3021894 354 }
elessair 0:f269e3021894 355
elessair 0:f269e3021894 356 void uart4_irq()
elessair 0:f269e3021894 357 {
elessair 0:f269e3021894 358 if(LPC_USART4->STAT & (1 << 2)){
elessair 0:f269e3021894 359 uart_irq(1, 4);
elessair 0:f269e3021894 360 }
elessair 0:f269e3021894 361 if(LPC_USART4->STAT & (1 << 0)){
elessair 0:f269e3021894 362 uart_irq(2, 4);
elessair 0:f269e3021894 363 }
elessair 0:f269e3021894 364 }
elessair 0:f269e3021894 365
elessair 0:f269e3021894 366 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
elessair 0:f269e3021894 367 irq_handler = handler;
elessair 0:f269e3021894 368 serial_irq_ids[obj->index] = id;
elessair 0:f269e3021894 369 }
elessair 0:f269e3021894 370
elessair 0:f269e3021894 371 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
elessair 0:f269e3021894 372 IRQn_Type irq_n = (IRQn_Type)0;
elessair 0:f269e3021894 373 uint32_t vector = 0;
elessair 0:f269e3021894 374 if(obj->index == 0){
elessair 0:f269e3021894 375 irq_n = USART0_IRQn; vector = (uint32_t)&uart0_irq;
elessair 0:f269e3021894 376 }
elessair 0:f269e3021894 377 else{
elessair 0:f269e3021894 378 switch ((int)obj->mini_uart) {
elessair 0:f269e3021894 379 case UART_0: irq_n = USART0_IRQn; vector = (uint32_t)&uart0_irq; break;
elessair 0:f269e3021894 380 case UART_1: irq_n = USART1_4_IRQn; vector = (uint32_t)&uart1_irq; break;
elessair 0:f269e3021894 381 case UART_2: irq_n = USART2_3_IRQn; vector = (uint32_t)&uart2_irq; break;
elessair 0:f269e3021894 382 case UART_3: irq_n = USART2_3_IRQn; vector = (uint32_t)&uart3_irq; break;
elessair 0:f269e3021894 383 case UART_4: irq_n = USART1_4_IRQn; vector = (uint32_t)&uart4_irq; break;
elessair 0:f269e3021894 384 }
elessair 0:f269e3021894 385 }
elessair 0:f269e3021894 386
elessair 0:f269e3021894 387 if (enable) {
elessair 0:f269e3021894 388 if (obj->index == 0) {
elessair 0:f269e3021894 389 obj->uart->IER |= (1 << irq);
elessair 0:f269e3021894 390 }
elessair 0:f269e3021894 391 else {
elessair 0:f269e3021894 392 obj->mini_uart->INTENSET = (1 << ((irq == RxIrq) ? 0 : 2));
elessair 0:f269e3021894 393 }
elessair 0:f269e3021894 394 NVIC_SetVector(irq_n, vector);
elessair 0:f269e3021894 395 NVIC_EnableIRQ(irq_n);
elessair 0:f269e3021894 396 } else { // disable
elessair 0:f269e3021894 397 int all_disabled = 0;
elessair 0:f269e3021894 398 SerialIrq other_irq = (irq == RxIrq) ? (RxIrq) : (TxIrq);
elessair 0:f269e3021894 399
elessair 0:f269e3021894 400 if (obj->index == 0) {
elessair 0:f269e3021894 401 obj->uart->IER &= ~(1 << irq);
elessair 0:f269e3021894 402 all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
elessair 0:f269e3021894 403 }
elessair 0:f269e3021894 404 else {
elessair 0:f269e3021894 405 obj->mini_uart->INTENCLR = (1 << ((irq == RxIrq) ? 0 : 2));
elessair 0:f269e3021894 406 all_disabled = (obj->mini_uart->INTENSET) == 0;
elessair 0:f269e3021894 407 }
elessair 0:f269e3021894 408
elessair 0:f269e3021894 409 if (all_disabled)
elessair 0:f269e3021894 410 NVIC_DisableIRQ(irq_n);
elessair 0:f269e3021894 411 }
elessair 0:f269e3021894 412 }
elessair 0:f269e3021894 413
elessair 0:f269e3021894 414 /******************************************************************************
elessair 0:f269e3021894 415 * READ/WRITE
elessair 0:f269e3021894 416 ******************************************************************************/
elessair 0:f269e3021894 417 int serial_getc(serial_t *obj) {
elessair 0:f269e3021894 418 while (!serial_readable(obj));
elessair 0:f269e3021894 419 if (obj->index == 0) {
elessair 0:f269e3021894 420 return obj->uart->RBR;
elessair 0:f269e3021894 421 }
elessair 0:f269e3021894 422 else {
elessair 0:f269e3021894 423 return obj->mini_uart->RXDAT;
elessair 0:f269e3021894 424 }
elessair 0:f269e3021894 425 }
elessair 0:f269e3021894 426
elessair 0:f269e3021894 427 void serial_putc(serial_t *obj, int c) {
elessair 0:f269e3021894 428 while (!serial_writable(obj));
elessair 0:f269e3021894 429 if (obj->index == 0) {
elessair 0:f269e3021894 430 obj->uart->THR = c;
elessair 0:f269e3021894 431 }
elessair 0:f269e3021894 432 else {
elessair 0:f269e3021894 433 obj->mini_uart->TXDAT = c;
elessair 0:f269e3021894 434 }
elessair 0:f269e3021894 435 }
elessair 0:f269e3021894 436
elessair 0:f269e3021894 437 int serial_readable(serial_t *obj) {
elessair 0:f269e3021894 438 if (obj->index == 0) {
elessair 0:f269e3021894 439 return obj->uart->LSR & 0x01;
elessair 0:f269e3021894 440 }
elessair 0:f269e3021894 441 else {
elessair 0:f269e3021894 442 return obj->mini_uart->STAT & RXRDY;
elessair 0:f269e3021894 443 }
elessair 0:f269e3021894 444 }
elessair 0:f269e3021894 445
elessair 0:f269e3021894 446 int serial_writable(serial_t *obj) {
elessair 0:f269e3021894 447 if (obj->index == 0) {
elessair 0:f269e3021894 448 return obj->uart->LSR & 0x20;
elessair 0:f269e3021894 449 }
elessair 0:f269e3021894 450 else {
elessair 0:f269e3021894 451 return obj->mini_uart->STAT & TXRDY;
elessair 0:f269e3021894 452 }
elessair 0:f269e3021894 453 }
elessair 0:f269e3021894 454
elessair 0:f269e3021894 455 void serial_clear(serial_t *obj) {
elessair 0:f269e3021894 456 if (obj->index == 0) {
elessair 0:f269e3021894 457 obj->uart->FCR = 1 << 1 // rx FIFO reset
elessair 0:f269e3021894 458 | 1 << 2 // tx FIFO reset
elessair 0:f269e3021894 459 | 0 << 6; // interrupt depth
elessair 0:f269e3021894 460 }
elessair 0:f269e3021894 461 else {
elessair 0:f269e3021894 462 obj->mini_uart->STAT = 0;
elessair 0:f269e3021894 463 }
elessair 0:f269e3021894 464 }
elessair 0:f269e3021894 465
elessair 0:f269e3021894 466 void serial_pinout_tx(PinName tx) {
elessair 0:f269e3021894 467 pinmap_pinout(tx, PinMap_UART_TX);
elessair 0:f269e3021894 468 }
elessair 0:f269e3021894 469
elessair 0:f269e3021894 470 void serial_break_set(serial_t *obj) {
elessair 0:f269e3021894 471 if (obj->index == 0) {
elessair 0:f269e3021894 472 obj->uart->LCR |= (1 << 6);
elessair 0:f269e3021894 473 }
elessair 0:f269e3021894 474 else {
elessair 0:f269e3021894 475 obj->mini_uart->CTL |= TXBRKEN;
elessair 0:f269e3021894 476 }
elessair 0:f269e3021894 477 }
elessair 0:f269e3021894 478
elessair 0:f269e3021894 479 void serial_break_clear(serial_t *obj) {
elessair 0:f269e3021894 480 if (obj->index == 0) {
elessair 0:f269e3021894 481 obj->uart->LCR &= ~(1 << 6);
elessair 0:f269e3021894 482 }
elessair 0:f269e3021894 483 else {
elessair 0:f269e3021894 484 obj->mini_uart->CTL &= ~TXBRKEN;
elessair 0:f269e3021894 485 }
elessair 0:f269e3021894 486 }
elessair 0:f269e3021894 487
elessair 0:f269e3021894 488
elessair 0:f269e3021894 489 #endif