Paul Paterson / mbed-src-CanNucleoF0

mbed library sources, include can_api for nucleo-f091rc

Dependents:   CanNucleoF0_example

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC43XX/serial_api.c@339:40bd4701f3e2, 2014-10-06 (annotated)

Committer:
mbed_official
Date:
Mon Oct 06 11:45:07 2014 +0100
Revision:
339:40bd4701f3e2
Parent:
285:31249416b6f9 
Synchronized with git revision 6d6dd0be3a7c63040d853cb4f5bfc1ba605a11bb



Full URL: https://github.com/mbedmicro/mbed/commit/6d6dd0be3a7c63040d853cb4f5bfc1ba605a11bb/



HAL: Allow Serial pin to be NC for all targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 *
bogdanm 20:4263a77256ae 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
bogdanm 20:4263a77256ae 17 */
bogdanm 20:4263a77256ae 18 // math.h required for floating point operations for baud rate calculation
bogdanm 20:4263a77256ae 19 #include <math.h>
bogdanm 20:4263a77256ae 20 #include <string.h>
mbed_official 140:ca60b7a31055 21 #include <stdlib.h>
bogdanm 20:4263a77256ae 22
bogdanm 20:4263a77256ae 23 #include "serial_api.h"
bogdanm 20:4263a77256ae 24 #include "cmsis.h"
bogdanm 20:4263a77256ae 25 #include "pinmap.h"
mbed_official 285:31249416b6f9 26 #include "mbed_error.h"
mbed_official 256:76fd9a263045 27 #include "gpio_api.h"
bogdanm 20:4263a77256ae 28
bogdanm 20:4263a77256ae 29 /******************************************************************************
bogdanm 20:4263a77256ae 30 * INITIALIZATION
bogdanm 20:4263a77256ae 31 ******************************************************************************/
mbed_official 256:76fd9a263045 32 #define UART_NUM 4
mbed_official 256:76fd9a263045 33
mbed_official 283:bf0f62a62bf4 34 // SCU mode for UART pins
mbed_official 283:bf0f62a62bf4 35 #define SCU_PINIO_UART_TX SCU_MODE_PULLDOWN
mbed_official 283:bf0f62a62bf4 36 #define SCU_PINIO_UART_RX SCU_PINIO_PULLNONE
mbed_official 283:bf0f62a62bf4 37
bogdanm 20:4263a77256ae 38 static const PinMap PinMap_UART_TX[] = {
mbed_official 283:bf0f62a62bf4 39 {P1_13, UART_1, (SCU_PINIO_UART_TX | 1)},
mbed_official 283:bf0f62a62bf4 40 {P1_15, UART_2, (SCU_PINIO_UART_TX | 1)},
mbed_official 283:bf0f62a62bf4 41 {P2_0, UART_0, (SCU_PINIO_UART_TX | 1)},
mbed_official 283:bf0f62a62bf4 42 {P2_3, UART_3, (SCU_PINIO_UART_TX | 2)},
mbed_official 283:bf0f62a62bf4 43 {P2_10, UART_2, (SCU_PINIO_UART_TX | 2)},
mbed_official 283:bf0f62a62bf4 44 {P3_4, UART_1, (SCU_PINIO_UART_TX | 4)},
mbed_official 283:bf0f62a62bf4 45 {P4_1, UART_3, (SCU_PINIO_UART_TX | 6)},
mbed_official 283:bf0f62a62bf4 46 {P5_6, UART_1, (SCU_PINIO_UART_TX | 4)},
mbed_official 283:bf0f62a62bf4 47 {P6_4, UART_0, (SCU_PINIO_UART_TX | 2)},
mbed_official 283:bf0f62a62bf4 48 {P7_1, UART_2, (SCU_PINIO_UART_TX | 6)},
mbed_official 283:bf0f62a62bf4 49 {P9_3, UART_3, (SCU_PINIO_UART_TX | 7)},
mbed_official 283:bf0f62a62bf4 50 {P9_5, UART_0, (SCU_PINIO_UART_TX | 7)},
mbed_official 283:bf0f62a62bf4 51 {PA_1, UART_2, (SCU_PINIO_UART_TX | 3)},
mbed_official 283:bf0f62a62bf4 52 {PC_13, UART_1, (SCU_PINIO_UART_TX | 2)},
mbed_official 283:bf0f62a62bf4 53 {PE_11, UART_1, (SCU_PINIO_UART_TX | 2)},
mbed_official 283:bf0f62a62bf4 54 {PF_2, UART_3, (SCU_PINIO_UART_TX | 1)},
mbed_official 283:bf0f62a62bf4 55 {PF_10, UART_0, (SCU_PINIO_UART_TX | 1)},
mbed_official 256:76fd9a263045 56 {NC, NC, 0}
bogdanm 20:4263a77256ae 57 };
bogdanm 20:4263a77256ae 58
bogdanm 20:4263a77256ae 59 static const PinMap PinMap_UART_RX[] = {
mbed_official 283:bf0f62a62bf4 60 {P1_14, UART_1, (SCU_PINIO_UART_RX | 1)},
mbed_official 283:bf0f62a62bf4 61 {P1_16, UART_2, (SCU_PINIO_UART_RX | 1)},
mbed_official 283:bf0f62a62bf4 62 {P2_1, UART_0, (SCU_PINIO_UART_RX | 1)},
mbed_official 283:bf0f62a62bf4 63 {P2_4, UART_3, (SCU_PINIO_UART_RX | 2)},
mbed_official 283:bf0f62a62bf4 64 {P2_11, UART_2, (SCU_PINIO_UART_RX | 2)},
mbed_official 283:bf0f62a62bf4 65 {P3_5, UART_1, (SCU_PINIO_UART_RX | 4)},
mbed_official 283:bf0f62a62bf4 66 {P4_2, UART_3, (SCU_PINIO_UART_RX | 6)},
mbed_official 283:bf0f62a62bf4 67 {P5_7, UART_1, (SCU_PINIO_UART_RX | 4)},
mbed_official 283:bf0f62a62bf4 68 {P6_5, UART_0, (SCU_PINIO_UART_RX | 2)},
mbed_official 283:bf0f62a62bf4 69 {P7_2, UART_2, (SCU_PINIO_UART_RX | 6)},
mbed_official 283:bf0f62a62bf4 70 {P9_4, UART_3, (SCU_PINIO_UART_RX | 7)},
mbed_official 283:bf0f62a62bf4 71 {P9_6, UART_0, (SCU_PINIO_UART_RX | 7)},
mbed_official 283:bf0f62a62bf4 72 {PA_2, UART_2, (SCU_PINIO_UART_RX | 3)},
mbed_official 283:bf0f62a62bf4 73 {PC_14, UART_1, (SCU_PINIO_UART_RX | 2)},
mbed_official 283:bf0f62a62bf4 74 {PE_12, UART_1, (SCU_PINIO_UART_RX | 2)},
mbed_official 283:bf0f62a62bf4 75 {PF_3, UART_3, (SCU_PINIO_UART_RX | 1)},
mbed_official 283:bf0f62a62bf4 76 {PF_11, UART_0, (SCU_PINIO_UART_RX | 1)},
mbed_official 256:76fd9a263045 77 {NC, NC, 0}
bogdanm 20:4263a77256ae 78 };
bogdanm 20:4263a77256ae 79
mbed_official 256:76fd9a263045 80 #if (DEVICE_SERIAL_FC)
mbed_official 256:76fd9a263045 81 // RTS/CTS PinMap for flow control
mbed_official 256:76fd9a263045 82 static const PinMap PinMap_UART_RTS[] = {
mbed_official 256:76fd9a263045 83 {P1_9, UART_1, (SCU_PINIO_FAST | 1)},
mbed_official 256:76fd9a263045 84 {P5_2, UART_1, (SCU_PINIO_FAST | 4)},
mbed_official 256:76fd9a263045 85 {PC_3, UART_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 86 {PE_5, UART_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 87 {NC, NC, 0}
mbed_official 256:76fd9a263045 88 };
bogdanm 20:4263a77256ae 89
mbed_official 256:76fd9a263045 90 static const PinMap PinMap_UART_CTS[] = {
mbed_official 256:76fd9a263045 91 {P1_11, UART_1, (SCU_PINIO_FAST | 1)},
mbed_official 256:76fd9a263045 92 {P5_4, UART_1, (SCU_PINIO_FAST | 4),
mbed_official 256:76fd9a263045 93 {PC_2, UART_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 94 {PE_7, UART_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 95 {NC, NC, 0}
mbed_official 256:76fd9a263045 96 };
mbed_official 256:76fd9a263045 97 #endif
mbed_official 256:76fd9a263045 98
bogdanm 20:4263a77256ae 99 static uart_irq_handler irq_handler;
bogdanm 20:4263a77256ae 100
bogdanm 20:4263a77256ae 101 int stdio_uart_inited = 0;
bogdanm 20:4263a77256ae 102 serial_t stdio_uart;
bogdanm 20:4263a77256ae 103
mbed_official 256:76fd9a263045 104 struct serial_global_data_s {
mbed_official 256:76fd9a263045 105 uint32_t serial_irq_id;
mbed_official 256:76fd9a263045 106 gpio_t sw_rts, sw_cts;
mbed_official 256:76fd9a263045 107 uint8_t count, rx_irq_set_flow, rx_irq_set_api;
mbed_official 256:76fd9a263045 108 };
mbed_official 256:76fd9a263045 109
mbed_official 256:76fd9a263045 110 static struct serial_global_data_s uart_data[UART_NUM];
mbed_official 256:76fd9a263045 111
bogdanm 20:4263a77256ae 112 void serial_init(serial_t *obj, PinName tx, PinName rx) {
bogdanm 20:4263a77256ae 113 int is_stdio_uart = 0;
bogdanm 20:4263a77256ae 114
bogdanm 20:4263a77256ae 115 // determine the UART to use
bogdanm 20:4263a77256ae 116 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
bogdanm 20:4263a77256ae 117 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
bogdanm 20:4263a77256ae 118 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
bogdanm 20:4263a77256ae 119 if ((int)uart == NC) {
bogdanm 20:4263a77256ae 120 error("Serial pinout mapping failed");
bogdanm 20:4263a77256ae 121 }
bogdanm 20:4263a77256ae 122
bogdanm 20:4263a77256ae 123 obj->uart = (LPC_USART_T *)uart;
bogdanm 20:4263a77256ae 124
bogdanm 20:4263a77256ae 125 // enable fifos and default rx trigger level
bogdanm 20:4263a77256ae 126 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
bogdanm 20:4263a77256ae 127 | 0 << 1 // Rx Fifo Reset
bogdanm 20:4263a77256ae 128 | 0 << 2 // Tx Fifo Reset
bogdanm 20:4263a77256ae 129 | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
bogdanm 20:4263a77256ae 130
bogdanm 20:4263a77256ae 131 // disable irqs
bogdanm 20:4263a77256ae 132 obj->uart->IER = 0 << 0 // Rx Data available irq enable
bogdanm 20:4263a77256ae 133 | 0 << 1 // Tx Fifo empty irq enable
bogdanm 20:4263a77256ae 134 | 0 << 2; // Rx Line Status irq enable
bogdanm 20:4263a77256ae 135
bogdanm 20:4263a77256ae 136 // set default baud rate and format
mbed_official 256:76fd9a263045 137 is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
mbed_official 256:76fd9a263045 138 serial_baud (obj, is_stdio_uart ? 115200 : 9600);
bogdanm 20:4263a77256ae 139 serial_format(obj, 8, ParityNone, 1);
bogdanm 20:4263a77256ae 140
bogdanm 20:4263a77256ae 141 // pinout the chosen uart
bogdanm 20:4263a77256ae 142 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 20:4263a77256ae 143 pinmap_pinout(rx, PinMap_UART_RX);
bogdanm 20:4263a77256ae 144
bogdanm 20:4263a77256ae 145 // set rx/tx pins in PullUp mode
mbed_official 339:40bd4701f3e2 146 if (tx != NC) {
mbed_official 339:40bd4701f3e2 147 pin_mode(tx, PullUp);
mbed_official 339:40bd4701f3e2 148 }
mbed_official 339:40bd4701f3e2 149 if (rx != NC) {
mbed_official 339:40bd4701f3e2 150 pin_mode(rx, PullUp);
mbed_official 339:40bd4701f3e2 151 }
bogdanm 20:4263a77256ae 152
bogdanm 20:4263a77256ae 153 switch (uart) {
bogdanm 20:4263a77256ae 154 case UART_0: obj->index = 0; break;
bogdanm 20:4263a77256ae 155 case UART_1: obj->index = 1; break;
bogdanm 20:4263a77256ae 156 case UART_2: obj->index = 2; break;
bogdanm 20:4263a77256ae 157 case UART_3: obj->index = 3; break;
bogdanm 20:4263a77256ae 158 }
mbed_official 256:76fd9a263045 159 uart_data[obj->index].sw_rts.pin = NC;
mbed_official 256:76fd9a263045 160 uart_data[obj->index].sw_cts.pin = NC;
mbed_official 256:76fd9a263045 161 serial_set_flow_control(obj, FlowControlNone, NC, NC);
bogdanm 20:4263a77256ae 162
bogdanm 20:4263a77256ae 163 if (is_stdio_uart) {
bogdanm 20:4263a77256ae 164 stdio_uart_inited = 1;
bogdanm 20:4263a77256ae 165 memcpy(&stdio_uart, obj, sizeof(serial_t));
bogdanm 20:4263a77256ae 166 }
bogdanm 20:4263a77256ae 167 }
bogdanm 20:4263a77256ae 168
bogdanm 20:4263a77256ae 169 void serial_free(serial_t *obj) {
mbed_official 256:76fd9a263045 170 uart_data[obj->index].serial_irq_id = 0;
bogdanm 20:4263a77256ae 171 }
bogdanm 20:4263a77256ae 172
bogdanm 20:4263a77256ae 173 // serial_baud
bogdanm 20:4263a77256ae 174 // set the baud rate, taking in to account the current SystemFrequency
bogdanm 20:4263a77256ae 175 void serial_baud(serial_t *obj, int baudrate) {
bogdanm 20:4263a77256ae 176 uint32_t PCLK = SystemCoreClock;
mbed_official 256:76fd9a263045 177
bogdanm 20:4263a77256ae 178 // First we check to see if the basic divide with no DivAddVal/MulVal
bogdanm 20:4263a77256ae 179 // ratio gives us an integer result. If it does, we set DivAddVal = 0,
bogdanm 20:4263a77256ae 180 // MulVal = 1. Otherwise, we search the valid ratio value range to find
bogdanm 20:4263a77256ae 181 // the closest match. This could be more elegant, using search methods
bogdanm 20:4263a77256ae 182 // and/or lookup tables, but the brute force method is not that much
bogdanm 20:4263a77256ae 183 // slower, and is more maintainable.
bogdanm 20:4263a77256ae 184 uint16_t DL = PCLK / (16 * baudrate);
bogdanm 20:4263a77256ae 185
bogdanm 20:4263a77256ae 186 uint8_t DivAddVal = 0;
bogdanm 20:4263a77256ae 187 uint8_t MulVal = 1;
bogdanm 20:4263a77256ae 188 int hit = 0;
bogdanm 20:4263a77256ae 189 uint16_t dlv;
bogdanm 20:4263a77256ae 190 uint8_t mv, dav;
bogdanm 20:4263a77256ae 191 if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
mbed_official 51:7838415c99e7 192 int err_best = baudrate, b;
mbed_official 51:7838415c99e7 193 for (mv = 1; mv < 16 && !hit; mv++)
mbed_official 51:7838415c99e7 194 {
mbed_official 51:7838415c99e7 195 for (dav = 0; dav < mv; dav++)
mbed_official 51:7838415c99e7 196 {
mbed_official 51:7838415c99e7 197 // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
mbed_official 51:7838415c99e7 198 // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
mbed_official 51:7838415c99e7 199 // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
mbed_official 51:7838415c99e7 200 // for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
mbed_official 51:7838415c99e7 201 // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
mbed_official 51:7838415c99e7 202
mbed_official 51:7838415c99e7 203 if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
mbed_official 51:7838415c99e7 204 dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
mbed_official 51:7838415c99e7 205 else // 2 bits headroom, use more precision
mbed_official 51:7838415c99e7 206 dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
mbed_official 51:7838415c99e7 207
mbed_official 51:7838415c99e7 208 // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
mbed_official 51:7838415c99e7 209 if (dlv == 0)
mbed_official 51:7838415c99e7 210 dlv = 1;
mbed_official 51:7838415c99e7 211
mbed_official 51:7838415c99e7 212 // datasheet says if dav > 0 then DL must be >= 2
mbed_official 51:7838415c99e7 213 if ((dav > 0) && (dlv < 2))
mbed_official 51:7838415c99e7 214 dlv = 2;
mbed_official 51:7838415c99e7 215
mbed_official 51:7838415c99e7 216 // integer rearrangement of the baudrate equation (with rounding)
mbed_official 51:7838415c99e7 217 b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
mbed_official 51:7838415c99e7 218
mbed_official 51:7838415c99e7 219 // check to see how we went
mbed_official 51:7838415c99e7 220 b = abs(b - baudrate);
mbed_official 51:7838415c99e7 221 if (b < err_best)
mbed_official 51:7838415c99e7 222 {
mbed_official 51:7838415c99e7 223 err_best = b;
mbed_official 51:7838415c99e7 224
mbed_official 51:7838415c99e7 225 DL = dlv;
mbed_official 51:7838415c99e7 226 MulVal = mv;
mbed_official 51:7838415c99e7 227 DivAddVal = dav;
mbed_official 51:7838415c99e7 228
mbed_official 51:7838415c99e7 229 if (b == baudrate)
mbed_official 51:7838415c99e7 230 {
mbed_official 51:7838415c99e7 231 hit = 1;
mbed_official 51:7838415c99e7 232 break;
bogdanm 20:4263a77256ae 233 }
bogdanm 20:4263a77256ae 234 }
bogdanm 20:4263a77256ae 235 }
bogdanm 20:4263a77256ae 236 }
bogdanm 20:4263a77256ae 237 }
bogdanm 20:4263a77256ae 238
bogdanm 20:4263a77256ae 239 // set LCR[DLAB] to enable writing to divider registers
bogdanm 20:4263a77256ae 240 obj->uart->LCR |= (1 << 7);
bogdanm 20:4263a77256ae 241
bogdanm 20:4263a77256ae 242 // set divider values
bogdanm 20:4263a77256ae 243 obj->uart->DLM = (DL >> 8) & 0xFF;
bogdanm 20:4263a77256ae 244 obj->uart->DLL = (DL >> 0) & 0xFF;
bogdanm 20:4263a77256ae 245 obj->uart->FDR = (uint32_t) DivAddVal << 0
bogdanm 20:4263a77256ae 246 | (uint32_t) MulVal << 4;
bogdanm 20:4263a77256ae 247
bogdanm 20:4263a77256ae 248 // clear LCR[DLAB]
bogdanm 20:4263a77256ae 249 obj->uart->LCR &= ~(1 << 7);
bogdanm 20:4263a77256ae 250 }
bogdanm 20:4263a77256ae 251
bogdanm 20:4263a77256ae 252 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
mbed_official 256:76fd9a263045 253 // 0: 1 stop bits, 1: 2 stop bits
mbed_official 256:76fd9a263045 254 if (stop_bits != 1 && stop_bits != 2) {
mbed_official 256:76fd9a263045 255 error("Invalid stop bits specified");
mbed_official 256:76fd9a263045 256 }
bogdanm 20:4263a77256ae 257 stop_bits -= 1;
mbed_official 256:76fd9a263045 258
mbed_official 256:76fd9a263045 259 // 0: 5 data bits ... 3: 8 data bits
mbed_official 256:76fd9a263045 260 if (data_bits < 5 || data_bits > 8) {
mbed_official 256:76fd9a263045 261 error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
mbed_official 256:76fd9a263045 262 }
bogdanm 20:4263a77256ae 263 data_bits -= 5;
bogdanm 20:4263a77256ae 264
bogdanm 20:4263a77256ae 265 int parity_enable, parity_select;
bogdanm 20:4263a77256ae 266 switch (parity) {
bogdanm 20:4263a77256ae 267 case ParityNone: parity_enable = 0; parity_select = 0; break;
bogdanm 20:4263a77256ae 268 case ParityOdd : parity_enable = 1; parity_select = 0; break;
bogdanm 20:4263a77256ae 269 case ParityEven: parity_enable = 1; parity_select = 1; break;
bogdanm 20:4263a77256ae 270 case ParityForced1: parity_enable = 1; parity_select = 2; break;
bogdanm 20:4263a77256ae 271 case ParityForced0: parity_enable = 1; parity_select = 3; break;
bogdanm 20:4263a77256ae 272 default:
mbed_official 256:76fd9a263045 273 error("Invalid serial parity setting");
mbed_official 256:76fd9a263045 274 return;
bogdanm 20:4263a77256ae 275 }
bogdanm 20:4263a77256ae 276
bogdanm 20:4263a77256ae 277 obj->uart->LCR = data_bits << 0
bogdanm 20:4263a77256ae 278 | stop_bits << 2
bogdanm 20:4263a77256ae 279 | parity_enable << 3
bogdanm 20:4263a77256ae 280 | parity_select << 4;
bogdanm 20:4263a77256ae 281 }
bogdanm 20:4263a77256ae 282
bogdanm 20:4263a77256ae 283 /******************************************************************************
bogdanm 20:4263a77256ae 284 * INTERRUPTS HANDLING
bogdanm 20:4263a77256ae 285 ******************************************************************************/
mbed_official 256:76fd9a263045 286 static inline void uart_irq(uint32_t iir, uint32_t index, LPC_USART_T *puart) {
bogdanm 20:4263a77256ae 287 // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling
bogdanm 20:4263a77256ae 288 SerialIrq irq_type;
bogdanm 20:4263a77256ae 289 switch (iir) {
bogdanm 20:4263a77256ae 290 case 1: irq_type = TxIrq; break;
bogdanm 20:4263a77256ae 291 case 2: irq_type = RxIrq; break;
bogdanm 20:4263a77256ae 292 default: return;
bogdanm 20:4263a77256ae 293 }
mbed_official 256:76fd9a263045 294 if ((RxIrq == irq_type) && (NC != uart_data[index].sw_rts.pin)) {
mbed_official 256:76fd9a263045 295 gpio_write(&uart_data[index].sw_rts, 1);
mbed_official 256:76fd9a263045 296 // Disable interrupt if it wasn't enabled by other part of the application
mbed_official 256:76fd9a263045 297 if (!uart_data[index].rx_irq_set_api)
mbed_official 256:76fd9a263045 298 puart->IER &= ~(1 << RxIrq);
mbed_official 256:76fd9a263045 299 }
mbed_official 256:76fd9a263045 300 if (uart_data[index].serial_irq_id != 0)
mbed_official 256:76fd9a263045 301 if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api))
mbed_official 256:76fd9a263045 302 irq_handler(uart_data[index].serial_irq_id, irq_type);
bogdanm 20:4263a77256ae 303 }
bogdanm 20:4263a77256ae 304
mbed_official 256:76fd9a263045 305 void uart0_irq() {uart_irq((LPC_USART0->IIR >> 1) & 0x7, 0, (LPC_USART_T*)LPC_USART0);}
mbed_official 256:76fd9a263045 306 void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1, (LPC_USART_T*)LPC_UART1);}
mbed_official 256:76fd9a263045 307 void uart2_irq() {uart_irq((LPC_USART2->IIR >> 1) & 0x7, 2, (LPC_USART_T*)LPC_USART2);}
mbed_official 256:76fd9a263045 308 void uart3_irq() {uart_irq((LPC_USART3->IIR >> 1) & 0x7, 3, (LPC_USART_T*)LPC_USART3);}
bogdanm 20:4263a77256ae 309
bogdanm 20:4263a77256ae 310 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
bogdanm 20:4263a77256ae 311 irq_handler = handler;
mbed_official 256:76fd9a263045 312 uart_data[obj->index].serial_irq_id = id;
bogdanm 20:4263a77256ae 313 }
bogdanm 20:4263a77256ae 314
mbed_official 256:76fd9a263045 315 static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) {
bogdanm 20:4263a77256ae 316 IRQn_Type irq_n = (IRQn_Type)0;
bogdanm 20:4263a77256ae 317 uint32_t vector = 0;
bogdanm 20:4263a77256ae 318 switch ((int)obj->uart) {
bogdanm 20:4263a77256ae 319 case UART_0: irq_n=USART0_IRQn; vector = (uint32_t)&uart0_irq; break;
mbed_official 256:76fd9a263045 320 case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break;
bogdanm 20:4263a77256ae 321 case UART_2: irq_n=USART2_IRQn; vector = (uint32_t)&uart2_irq; break;
bogdanm 20:4263a77256ae 322 case UART_3: irq_n=USART3_IRQn; vector = (uint32_t)&uart3_irq; break;
bogdanm 20:4263a77256ae 323 }
bogdanm 20:4263a77256ae 324
bogdanm 20:4263a77256ae 325 if (enable) {
bogdanm 20:4263a77256ae 326 obj->uart->IER |= 1 << irq;
bogdanm 20:4263a77256ae 327 NVIC_SetVector(irq_n, vector);
bogdanm 20:4263a77256ae 328 NVIC_EnableIRQ(irq_n);
mbed_official 256:76fd9a263045 329 } else if ((TxIrq == irq) || (uart_data[obj->index].rx_irq_set_api + uart_data[obj->index].rx_irq_set_flow == 0)) { // disable
bogdanm 20:4263a77256ae 330 int all_disabled = 0;
bogdanm 20:4263a77256ae 331 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
bogdanm 20:4263a77256ae 332 obj->uart->IER &= ~(1 << irq);
bogdanm 20:4263a77256ae 333 all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
bogdanm 20:4263a77256ae 334 if (all_disabled)
bogdanm 20:4263a77256ae 335 NVIC_DisableIRQ(irq_n);
bogdanm 20:4263a77256ae 336 }
bogdanm 20:4263a77256ae 337 }
bogdanm 20:4263a77256ae 338
mbed_official 256:76fd9a263045 339 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
mbed_official 256:76fd9a263045 340 if (RxIrq == irq)
mbed_official 256:76fd9a263045 341 uart_data[obj->index].rx_irq_set_api = enable;
mbed_official 256:76fd9a263045 342 serial_irq_set_internal(obj, irq, enable);
mbed_official 256:76fd9a263045 343 }
mbed_official 256:76fd9a263045 344
mbed_official 256:76fd9a263045 345 #if (DEVICE_SERIAL_FC)
mbed_official 256:76fd9a263045 346 static void serial_flow_irq_set(serial_t *obj, uint32_t enable) {
mbed_official 256:76fd9a263045 347 uart_data[obj->index].rx_irq_set_flow = enable;
mbed_official 256:76fd9a263045 348 serial_irq_set_internal(obj, RxIrq, enable);
mbed_official 256:76fd9a263045 349 }
mbed_official 256:76fd9a263045 350 #endif
mbed_official 256:76fd9a263045 351
bogdanm 20:4263a77256ae 352 /******************************************************************************
bogdanm 20:4263a77256ae 353 * READ/WRITE
bogdanm 20:4263a77256ae 354 ******************************************************************************/
bogdanm 20:4263a77256ae 355 int serial_getc(serial_t *obj) {
bogdanm 20:4263a77256ae 356 while (!serial_readable(obj));
mbed_official 256:76fd9a263045 357 int data = obj->uart->RBR;
mbed_official 256:76fd9a263045 358 if (NC != uart_data[obj->index].sw_rts.pin) {
mbed_official 256:76fd9a263045 359 gpio_write(&uart_data[obj->index].sw_rts, 0);
mbed_official 256:76fd9a263045 360 obj->uart->IER |= 1 << RxIrq;
mbed_official 256:76fd9a263045 361 }
mbed_official 256:76fd9a263045 362 return data;
bogdanm 20:4263a77256ae 363 }
bogdanm 20:4263a77256ae 364
bogdanm 20:4263a77256ae 365 void serial_putc(serial_t *obj, int c) {
bogdanm 20:4263a77256ae 366 while (!serial_writable(obj));
bogdanm 20:4263a77256ae 367 obj->uart->THR = c;
mbed_official 256:76fd9a263045 368 uart_data[obj->index].count++;
bogdanm 20:4263a77256ae 369 }
bogdanm 20:4263a77256ae 370
bogdanm 20:4263a77256ae 371 int serial_readable(serial_t *obj) {
bogdanm 20:4263a77256ae 372 return obj->uart->LSR & 0x01;
bogdanm 20:4263a77256ae 373 }
bogdanm 20:4263a77256ae 374
bogdanm 20:4263a77256ae 375 int serial_writable(serial_t *obj) {
mbed_official 256:76fd9a263045 376 int isWritable = 1;
mbed_official 256:76fd9a263045 377 if (NC != uart_data[obj->index].sw_cts.pin)
mbed_official 256:76fd9a263045 378 isWritable = (gpio_read(&uart_data[obj->index].sw_cts) == 0) && (obj->uart->LSR & 0x40); //If flow control: writable if CTS low + UART done
mbed_official 256:76fd9a263045 379 else {
mbed_official 256:76fd9a263045 380 if (obj->uart->LSR & 0x20)
mbed_official 256:76fd9a263045 381 uart_data[obj->index].count = 0;
mbed_official 256:76fd9a263045 382 else if (uart_data[obj->index].count >= 16)
mbed_official 256:76fd9a263045 383 isWritable = 0;
mbed_official 256:76fd9a263045 384 }
mbed_official 256:76fd9a263045 385 return isWritable;
bogdanm 20:4263a77256ae 386 }
bogdanm 20:4263a77256ae 387
bogdanm 20:4263a77256ae 388 void serial_clear(serial_t *obj) {
mbed_official 256:76fd9a263045 389 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
mbed_official 256:76fd9a263045 390 | 1 << 1 // rx FIFO reset
bogdanm 20:4263a77256ae 391 | 1 << 2 // tx FIFO reset
bogdanm 20:4263a77256ae 392 | 0 << 6; // interrupt depth
bogdanm 20:4263a77256ae 393 }
bogdanm 20:4263a77256ae 394
bogdanm 20:4263a77256ae 395 void serial_pinout_tx(PinName tx) {
bogdanm 20:4263a77256ae 396 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 20:4263a77256ae 397 }
bogdanm 20:4263a77256ae 398
bogdanm 20:4263a77256ae 399 void serial_break_set(serial_t *obj) {
bogdanm 20:4263a77256ae 400 obj->uart->LCR |= (1 << 6);
bogdanm 20:4263a77256ae 401 }
bogdanm 20:4263a77256ae 402
bogdanm 20:4263a77256ae 403 void serial_break_clear(serial_t *obj) {
bogdanm 20:4263a77256ae 404 obj->uart->LCR &= ~(1 << 6);
bogdanm 20:4263a77256ae 405 }
bogdanm 20:4263a77256ae 406
mbed_official 256:76fd9a263045 407 void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) {
mbed_official 256:76fd9a263045 408 #if (DEVICE_SERIAL_FC)
mbed_official 256:76fd9a263045 409 #endif
mbed_official 256:76fd9a263045 410 }