shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC408X/serial_api.c@140:ca60b7a31055, 2014-04-01 (annotated)

Committer:
mbed_official
Date:
Tue Apr 01 10:00:07 2014 +0100
Revision:
140:ca60b7a31055
Parent:
51:7838415c99e7
Child:
227:7bd0639b8911
Synchronized with git revision fdcc1e387426ce216bc17175b73bcd5f4aececff



Full URL: https://github.com/mbedmicro/mbed/commit/fdcc1e387426ce216bc17175b73bcd5f4aececff/



Changed error(...) to a weak function

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 15:4892fe388435 1 /* mbed Microcontroller Library
bogdanm 15:4892fe388435 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 15:4892fe388435 3 *
bogdanm 15:4892fe388435 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 15:4892fe388435 5 * you may not use this file except in compliance with the License.
bogdanm 15:4892fe388435 6 * You may obtain a copy of the License at
bogdanm 15:4892fe388435 7 *
bogdanm 15:4892fe388435 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 15:4892fe388435 9 *
bogdanm 15:4892fe388435 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 15:4892fe388435 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 15:4892fe388435 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 15:4892fe388435 13 * See the License for the specific language governing permissions and
bogdanm 15:4892fe388435 14 * limitations under the License.
bogdanm 15:4892fe388435 15 */
bogdanm 15:4892fe388435 16 // math.h required for floating point operations for baud rate calculation
bogdanm 15:4892fe388435 17 #include <math.h>
bogdanm 15:4892fe388435 18 #include <string.h>
mbed_official 140:ca60b7a31055 19 #include <stdlib.h>
bogdanm 15:4892fe388435 20
bogdanm 15:4892fe388435 21 #include "serial_api.h"
bogdanm 15:4892fe388435 22 #include "cmsis.h"
bogdanm 15:4892fe388435 23 #include "pinmap.h"
bogdanm 15:4892fe388435 24 #include "error.h"
bogdanm 15:4892fe388435 25
bogdanm 15:4892fe388435 26 /******************************************************************************
bogdanm 15:4892fe388435 27 * INITIALIZATION
bogdanm 15:4892fe388435 28 ******************************************************************************/
bogdanm 15:4892fe388435 29 static const PinMap PinMap_UART_TX[] = {
bogdanm 15:4892fe388435 30 {P0_0, UART_3, 2},
bogdanm 15:4892fe388435 31 {P0_2, UART_0, 1},
bogdanm 15:4892fe388435 32 {P0_10, UART_2, 1},
bogdanm 15:4892fe388435 33 {P0_15, UART_1, 1},
bogdanm 15:4892fe388435 34 {P1_29, UART_4, 5},
bogdanm 15:4892fe388435 35 {P0_25, UART_3, 3},
bogdanm 15:4892fe388435 36 {P2_0 , UART_1, 2},
bogdanm 15:4892fe388435 37 {P2_8 , UART_2, 2},
bogdanm 15:4892fe388435 38 {P3_16, UART_1, 3},
bogdanm 15:4892fe388435 39 {P4_22, UART_2, 2},
bogdanm 15:4892fe388435 40 {P4_28, UART_3, 2},
bogdanm 15:4892fe388435 41 {P5_4, UART_4, 4},
bogdanm 15:4892fe388435 42 {NC , NC , 0}
bogdanm 15:4892fe388435 43 };
bogdanm 15:4892fe388435 44
bogdanm 15:4892fe388435 45 static const PinMap PinMap_UART_RX[] = {
bogdanm 15:4892fe388435 46 {P0_1 , UART_3, 2},
bogdanm 15:4892fe388435 47 {P0_3 , UART_0, 1},
bogdanm 15:4892fe388435 48 {P0_11, UART_2, 1},
bogdanm 15:4892fe388435 49 {P0_16, UART_1, 1},
bogdanm 15:4892fe388435 50 {P0_26, UART_3, 3},
bogdanm 15:4892fe388435 51 {P2_1 , UART_1, 2},
bogdanm 15:4892fe388435 52 {P2_9 , UART_2, 2},
bogdanm 15:4892fe388435 53 {P3_17, UART_1, 3},
bogdanm 15:4892fe388435 54 {P4_23, UART_2, 2},
bogdanm 15:4892fe388435 55 {P4_29, UART_3, 2},
bogdanm 15:4892fe388435 56 {P5_3, UART_4, 4},
bogdanm 15:4892fe388435 57 {NC , NC , 0}
bogdanm 15:4892fe388435 58 };
bogdanm 15:4892fe388435 59
bogdanm 15:4892fe388435 60 #define UART_NUM 5
bogdanm 15:4892fe388435 61
bogdanm 15:4892fe388435 62 static uint32_t serial_irq_ids[UART_NUM] = {0};
bogdanm 15:4892fe388435 63 static uart_irq_handler irq_handler;
bogdanm 15:4892fe388435 64
bogdanm 15:4892fe388435 65 int stdio_uart_inited = 0;
bogdanm 15:4892fe388435 66 serial_t stdio_uart;
bogdanm 15:4892fe388435 67
bogdanm 15:4892fe388435 68 void serial_init(serial_t *obj, PinName tx, PinName rx) {
bogdanm 15:4892fe388435 69 int is_stdio_uart = 0;
bogdanm 15:4892fe388435 70
bogdanm 15:4892fe388435 71 // determine the UART to use
bogdanm 15:4892fe388435 72 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
bogdanm 15:4892fe388435 73 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
bogdanm 15:4892fe388435 74 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
bogdanm 15:4892fe388435 75 if ((int)uart == NC) {
bogdanm 15:4892fe388435 76 error("Serial pinout mapping failed");
bogdanm 15:4892fe388435 77 }
bogdanm 15:4892fe388435 78
bogdanm 15:4892fe388435 79 obj->uart = (LPC_UART_TypeDef *)uart;
bogdanm 15:4892fe388435 80 // enable power
bogdanm 15:4892fe388435 81 switch (uart) {
bogdanm 15:4892fe388435 82 case UART_0: LPC_SC->PCONP |= 1 << 3; break;
bogdanm 15:4892fe388435 83 case UART_1: LPC_SC->PCONP |= 1 << 4; break;
bogdanm 15:4892fe388435 84 case UART_2: LPC_SC->PCONP |= 1 << 24; break;
bogdanm 15:4892fe388435 85 case UART_3: LPC_SC->PCONP |= 1 << 25; break;
bogdanm 15:4892fe388435 86 case UART_4: LPC_SC->PCONP |= 1 << 8; break;
bogdanm 15:4892fe388435 87 }
bogdanm 15:4892fe388435 88
bogdanm 15:4892fe388435 89 // enable fifos and default rx trigger level
bogdanm 15:4892fe388435 90 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
bogdanm 15:4892fe388435 91 | 0 << 1 // Rx Fifo Reset
bogdanm 15:4892fe388435 92 | 0 << 2 // Tx Fifo Reset
bogdanm 15:4892fe388435 93 | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
bogdanm 15:4892fe388435 94
bogdanm 15:4892fe388435 95 // disable irqs
bogdanm 15:4892fe388435 96 obj->uart->IER = 0 << 0 // Rx Data available irq enable
bogdanm 15:4892fe388435 97 | 0 << 1 // Tx Fifo empty irq enable
bogdanm 15:4892fe388435 98 | 0 << 2; // Rx Line Status irq enable
bogdanm 15:4892fe388435 99
bogdanm 15:4892fe388435 100 // set default baud rate and format
bogdanm 15:4892fe388435 101 serial_baud (obj, 9600);
bogdanm 15:4892fe388435 102 serial_format(obj, 8, ParityNone, 1);
bogdanm 15:4892fe388435 103
bogdanm 15:4892fe388435 104 // pinout the chosen uart
bogdanm 15:4892fe388435 105 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 15:4892fe388435 106 pinmap_pinout(rx, PinMap_UART_RX);
bogdanm 15:4892fe388435 107
bogdanm 15:4892fe388435 108 // set rx/tx pins in PullUp mode
bogdanm 15:4892fe388435 109 pin_mode(tx, PullUp);
bogdanm 15:4892fe388435 110 pin_mode(rx, PullUp);
bogdanm 15:4892fe388435 111
bogdanm 15:4892fe388435 112 switch (uart) {
bogdanm 15:4892fe388435 113 case UART_0: obj->index = 0; break;
bogdanm 15:4892fe388435 114 case UART_1: obj->index = 1; break;
bogdanm 15:4892fe388435 115 case UART_2: obj->index = 2; break;
bogdanm 15:4892fe388435 116 case UART_3: obj->index = 3; break;
bogdanm 15:4892fe388435 117 case UART_4: obj->index = 4; break;
bogdanm 15:4892fe388435 118 }
bogdanm 15:4892fe388435 119
bogdanm 15:4892fe388435 120 is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
bogdanm 15:4892fe388435 121
bogdanm 15:4892fe388435 122 if (is_stdio_uart) {
bogdanm 15:4892fe388435 123 stdio_uart_inited = 1;
bogdanm 15:4892fe388435 124 memcpy(&stdio_uart, obj, sizeof(serial_t));
bogdanm 15:4892fe388435 125 }
bogdanm 15:4892fe388435 126 }
bogdanm 15:4892fe388435 127
bogdanm 15:4892fe388435 128 void serial_free(serial_t *obj) {
bogdanm 15:4892fe388435 129 serial_irq_ids[obj->index] = 0;
bogdanm 15:4892fe388435 130 }
bogdanm 15:4892fe388435 131
bogdanm 15:4892fe388435 132 // serial_baud
bogdanm 15:4892fe388435 133 // set the baud rate, taking in to account the current SystemFrequency
bogdanm 15:4892fe388435 134 void serial_baud(serial_t *obj, int baudrate) {
bogdanm 15:4892fe388435 135 uint32_t PCLK = PeripheralClock;
bogdanm 15:4892fe388435 136
bogdanm 15:4892fe388435 137 // First we check to see if the basic divide with no DivAddVal/MulVal
bogdanm 15:4892fe388435 138 // ratio gives us an integer result. If it does, we set DivAddVal = 0,
bogdanm 15:4892fe388435 139 // MulVal = 1. Otherwise, we search the valid ratio value range to find
bogdanm 15:4892fe388435 140 // the closest match. This could be more elegant, using search methods
bogdanm 15:4892fe388435 141 // and/or lookup tables, but the brute force method is not that much
bogdanm 15:4892fe388435 142 // slower, and is more maintainable.
bogdanm 15:4892fe388435 143 uint16_t DL = PCLK / (16 * baudrate);
bogdanm 15:4892fe388435 144
bogdanm 15:4892fe388435 145 uint8_t DivAddVal = 0;
bogdanm 15:4892fe388435 146 uint8_t MulVal = 1;
bogdanm 15:4892fe388435 147 int hit = 0;
bogdanm 15:4892fe388435 148 uint16_t dlv;
bogdanm 15:4892fe388435 149 uint8_t mv, dav;
bogdanm 15:4892fe388435 150 if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
mbed_official 51:7838415c99e7 151 int err_best = baudrate, b;
mbed_official 51:7838415c99e7 152 for (mv = 1; mv < 16 && !hit; mv++)
mbed_official 51:7838415c99e7 153 {
mbed_official 51:7838415c99e7 154 for (dav = 0; dav < mv; dav++)
mbed_official 51:7838415c99e7 155 {
mbed_official 51:7838415c99e7 156 // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
mbed_official 51:7838415c99e7 157 // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
mbed_official 51:7838415c99e7 158 // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
mbed_official 51:7838415c99e7 159 // 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 160 // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
mbed_official 51:7838415c99e7 161
mbed_official 51:7838415c99e7 162 if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
mbed_official 51:7838415c99e7 163 dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
mbed_official 51:7838415c99e7 164 else // 2 bits headroom, use more precision
mbed_official 51:7838415c99e7 165 dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
mbed_official 51:7838415c99e7 166
mbed_official 51:7838415c99e7 167 // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
mbed_official 51:7838415c99e7 168 if (dlv == 0)
mbed_official 51:7838415c99e7 169 dlv = 1;
mbed_official 51:7838415c99e7 170
mbed_official 51:7838415c99e7 171 // datasheet says if dav > 0 then DL must be >= 2
mbed_official 51:7838415c99e7 172 if ((dav > 0) && (dlv < 2))
mbed_official 51:7838415c99e7 173 dlv = 2;
mbed_official 51:7838415c99e7 174
mbed_official 51:7838415c99e7 175 // integer rearrangement of the baudrate equation (with rounding)
mbed_official 51:7838415c99e7 176 b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
mbed_official 51:7838415c99e7 177
mbed_official 51:7838415c99e7 178 // check to see how we went
mbed_official 51:7838415c99e7 179 b = abs(b - baudrate);
mbed_official 51:7838415c99e7 180 if (b < err_best)
mbed_official 51:7838415c99e7 181 {
mbed_official 51:7838415c99e7 182 err_best = b;
mbed_official 51:7838415c99e7 183
mbed_official 51:7838415c99e7 184 DL = dlv;
mbed_official 51:7838415c99e7 185 MulVal = mv;
mbed_official 51:7838415c99e7 186 DivAddVal = dav;
mbed_official 51:7838415c99e7 187
mbed_official 51:7838415c99e7 188 if (b == baudrate)
mbed_official 51:7838415c99e7 189 {
mbed_official 51:7838415c99e7 190 hit = 1;
mbed_official 51:7838415c99e7 191 break;
bogdanm 15:4892fe388435 192 }
bogdanm 15:4892fe388435 193 }
bogdanm 15:4892fe388435 194 }
bogdanm 15:4892fe388435 195 }
bogdanm 15:4892fe388435 196 }
bogdanm 15:4892fe388435 197
bogdanm 15:4892fe388435 198 // set LCR[DLAB] to enable writing to divider registers
bogdanm 15:4892fe388435 199 obj->uart->LCR |= (1 << 7);
bogdanm 15:4892fe388435 200
bogdanm 15:4892fe388435 201 // set divider values
bogdanm 15:4892fe388435 202 obj->uart->DLM = (DL >> 8) & 0xFF;
bogdanm 15:4892fe388435 203 obj->uart->DLL = (DL >> 0) & 0xFF;
bogdanm 15:4892fe388435 204 obj->uart->FDR = (uint32_t) DivAddVal << 0
bogdanm 15:4892fe388435 205 | (uint32_t) MulVal << 4;
bogdanm 15:4892fe388435 206
bogdanm 15:4892fe388435 207 // clear LCR[DLAB]
bogdanm 15:4892fe388435 208 obj->uart->LCR &= ~(1 << 7);
bogdanm 15:4892fe388435 209 }
bogdanm 15:4892fe388435 210
bogdanm 15:4892fe388435 211 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
bogdanm 15:4892fe388435 212 // 0: 1 stop bits, 1: 2 stop bits
bogdanm 15:4892fe388435 213 if (stop_bits != 1 && stop_bits != 2) {
bogdanm 15:4892fe388435 214 error("Invalid stop bits specified");
bogdanm 15:4892fe388435 215 }
bogdanm 15:4892fe388435 216 stop_bits -= 1;
bogdanm 15:4892fe388435 217
bogdanm 15:4892fe388435 218 // 0: 5 data bits ... 3: 8 data bits
bogdanm 15:4892fe388435 219 if (data_bits < 5 || data_bits > 8) {
bogdanm 15:4892fe388435 220 error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
bogdanm 15:4892fe388435 221 }
bogdanm 15:4892fe388435 222 data_bits -= 5;
bogdanm 15:4892fe388435 223
bogdanm 15:4892fe388435 224 int parity_enable, parity_select;
bogdanm 15:4892fe388435 225 switch (parity) {
bogdanm 15:4892fe388435 226 case ParityNone: parity_enable = 0; parity_select = 0; break;
bogdanm 15:4892fe388435 227 case ParityOdd : parity_enable = 1; parity_select = 0; break;
bogdanm 15:4892fe388435 228 case ParityEven: parity_enable = 1; parity_select = 1; break;
bogdanm 15:4892fe388435 229 case ParityForced1: parity_enable = 1; parity_select = 2; break;
bogdanm 15:4892fe388435 230 case ParityForced0: parity_enable = 1; parity_select = 3; break;
bogdanm 15:4892fe388435 231 default:
bogdanm 15:4892fe388435 232 error("Invalid serial parity setting");
bogdanm 15:4892fe388435 233 return;
bogdanm 15:4892fe388435 234 }
bogdanm 15:4892fe388435 235
bogdanm 15:4892fe388435 236 obj->uart->LCR = data_bits << 0
bogdanm 15:4892fe388435 237 | stop_bits << 2
bogdanm 15:4892fe388435 238 | parity_enable << 3
bogdanm 15:4892fe388435 239 | parity_select << 4;
bogdanm 15:4892fe388435 240 }
bogdanm 15:4892fe388435 241
bogdanm 15:4892fe388435 242 /******************************************************************************
bogdanm 15:4892fe388435 243 * INTERRUPTS HANDLING
bogdanm 15:4892fe388435 244 ******************************************************************************/
bogdanm 15:4892fe388435 245 static inline void uart_irq(uint32_t iir, uint32_t index) {
bogdanm 15:4892fe388435 246 // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling
bogdanm 15:4892fe388435 247 SerialIrq irq_type;
bogdanm 15:4892fe388435 248 switch (iir) {
bogdanm 15:4892fe388435 249 case 1: irq_type = TxIrq; break;
bogdanm 15:4892fe388435 250 case 2: irq_type = RxIrq; break;
bogdanm 15:4892fe388435 251 default: return;
bogdanm 15:4892fe388435 252 }
bogdanm 15:4892fe388435 253
bogdanm 15:4892fe388435 254 if (serial_irq_ids[index] != 0)
bogdanm 15:4892fe388435 255 irq_handler(serial_irq_ids[index], irq_type);
bogdanm 15:4892fe388435 256 }
bogdanm 15:4892fe388435 257
bogdanm 15:4892fe388435 258 void uart0_irq() {uart_irq((LPC_UART0->IIR >> 1) & 0x7, 0);}
bogdanm 15:4892fe388435 259 void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1);}
bogdanm 15:4892fe388435 260 void uart2_irq() {uart_irq((LPC_UART2->IIR >> 1) & 0x7, 2);}
bogdanm 15:4892fe388435 261 void uart3_irq() {uart_irq((LPC_UART3->IIR >> 1) & 0x7, 3);}
bogdanm 15:4892fe388435 262 void uart4_irq() {uart_irq((LPC_UART4->IIR >> 1) & 0x7, 4);}
bogdanm 15:4892fe388435 263
bogdanm 15:4892fe388435 264 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
bogdanm 15:4892fe388435 265 irq_handler = handler;
bogdanm 15:4892fe388435 266 serial_irq_ids[obj->index] = id;
bogdanm 15:4892fe388435 267 }
bogdanm 15:4892fe388435 268
bogdanm 15:4892fe388435 269 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
bogdanm 15:4892fe388435 270 IRQn_Type irq_n = (IRQn_Type)0;
bogdanm 15:4892fe388435 271 uint32_t vector = 0;
bogdanm 15:4892fe388435 272 switch ((int)obj->uart) {
bogdanm 15:4892fe388435 273 case UART_0: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break;
bogdanm 15:4892fe388435 274 case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break;
bogdanm 15:4892fe388435 275 case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break;
bogdanm 15:4892fe388435 276 case UART_3: irq_n=UART3_IRQn; vector = (uint32_t)&uart3_irq; break;
bogdanm 15:4892fe388435 277 case UART_4: irq_n=UART4_IRQn; vector = (uint32_t)&uart4_irq; break;
bogdanm 15:4892fe388435 278 }
bogdanm 15:4892fe388435 279
bogdanm 15:4892fe388435 280 if (enable) {
bogdanm 15:4892fe388435 281 obj->uart->IER |= 1 << irq;
bogdanm 15:4892fe388435 282 NVIC_SetVector(irq_n, vector);
bogdanm 15:4892fe388435 283 NVIC_EnableIRQ(irq_n);
bogdanm 15:4892fe388435 284 } else { // disable
bogdanm 15:4892fe388435 285 int all_disabled = 0;
bogdanm 15:4892fe388435 286 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
bogdanm 15:4892fe388435 287 obj->uart->IER &= ~(1 << irq);
bogdanm 15:4892fe388435 288 all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
bogdanm 15:4892fe388435 289 if (all_disabled)
bogdanm 15:4892fe388435 290 NVIC_DisableIRQ(irq_n);
bogdanm 15:4892fe388435 291 }
bogdanm 15:4892fe388435 292 }
bogdanm 15:4892fe388435 293
bogdanm 15:4892fe388435 294 /******************************************************************************
bogdanm 15:4892fe388435 295 * READ/WRITE
bogdanm 15:4892fe388435 296 ******************************************************************************/
bogdanm 15:4892fe388435 297 int serial_getc(serial_t *obj) {
bogdanm 15:4892fe388435 298 while (!serial_readable(obj));
bogdanm 15:4892fe388435 299 return obj->uart->RBR;
bogdanm 15:4892fe388435 300 }
bogdanm 15:4892fe388435 301
bogdanm 15:4892fe388435 302 void serial_putc(serial_t *obj, int c) {
bogdanm 15:4892fe388435 303 while (!serial_writable(obj));
bogdanm 15:4892fe388435 304 obj->uart->THR = c;
bogdanm 15:4892fe388435 305 }
bogdanm 15:4892fe388435 306
bogdanm 15:4892fe388435 307 int serial_readable(serial_t *obj) {
bogdanm 15:4892fe388435 308 return obj->uart->LSR & 0x01;
bogdanm 15:4892fe388435 309 }
bogdanm 15:4892fe388435 310
bogdanm 15:4892fe388435 311 int serial_writable(serial_t *obj) {
bogdanm 15:4892fe388435 312 return obj->uart->LSR & 0x20;
bogdanm 15:4892fe388435 313 }
bogdanm 15:4892fe388435 314
bogdanm 15:4892fe388435 315 void serial_clear(serial_t *obj) {
mbed_official 29:6ac4027eff2b 316 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
mbed_official 29:6ac4027eff2b 317 | 1 << 1 // rx FIFO reset
mbed_official 29:6ac4027eff2b 318 | 1 << 2 // tx FIFO reset
mbed_official 29:6ac4027eff2b 319 | 0 << 6; // interrupt depth
bogdanm 15:4892fe388435 320 }
bogdanm 15:4892fe388435 321
bogdanm 15:4892fe388435 322 void serial_pinout_tx(PinName tx) {
bogdanm 15:4892fe388435 323 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 15:4892fe388435 324 }
bogdanm 15:4892fe388435 325
bogdanm 15:4892fe388435 326 void serial_break_set(serial_t *obj) {
bogdanm 15:4892fe388435 327 obj->uart->LCR |= (1 << 6);
bogdanm 15:4892fe388435 328 }
bogdanm 15:4892fe388435 329
bogdanm 15:4892fe388435 330 void serial_break_clear(serial_t *obj) {
bogdanm 15:4892fe388435 331 obj->uart->LCR &= ~(1 << 6);
bogdanm 15:4892fe388435 332 }
bogdanm 15:4892fe388435 333