Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL46Z/serial_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "serial_api.h"
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 // math.h required for floating point operations for baud rate calculation
<> 144:ef7eb2e8f9f7 20 #include <math.h>
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include <string.h>
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 25 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 26 #include "clk_freqs.h"
<> 144:ef7eb2e8f9f7 27 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 //Devices either user UART0 or UARTLP
<> 144:ef7eb2e8f9f7 30 #ifndef UARTLP_BASES
<> 144:ef7eb2e8f9f7 31 #define UARTLP_C2_RE_MASK UART0_C2_RE_MASK
<> 144:ef7eb2e8f9f7 32 #define UARTLP_C2_TE_MASK UART0_C2_TE_MASK
<> 144:ef7eb2e8f9f7 33 #define UARTLP_BDH_SBNS_MASK UART0_BDH_SBNS_MASK
<> 144:ef7eb2e8f9f7 34 #define UARTLP_BDH_SBNS_SHIFT UART0_BDH_SBNS_SHIFT
<> 144:ef7eb2e8f9f7 35 #define UARTLP_S1_TDRE_MASK UART0_S1_TDRE_MASK
<> 144:ef7eb2e8f9f7 36 #define UARTLP_S1_TC_MASK UART0_S1_TC_MASK
<> 144:ef7eb2e8f9f7 37 #define UARTLP_S1_OR_MASK UART0_S1_OR_MASK
<> 144:ef7eb2e8f9f7 38 #define UARTLP_C2_RIE_MASK UART0_C2_RIE_MASK
<> 144:ef7eb2e8f9f7 39 #define UARTLP_C2_TIE_MASK UART0_C2_TIE_MASK
<> 144:ef7eb2e8f9f7 40 #define UARTLP_C2_SBK_MASK UART0_C2_SBK_MASK
<> 144:ef7eb2e8f9f7 41 #define UARTLP_S1_RDRF_MASK UART0_S1_RDRF_MASK
<> 144:ef7eb2e8f9f7 42 #endif
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 #ifdef UART2
<> 144:ef7eb2e8f9f7 45 #define UART_NUM 3
<> 144:ef7eb2e8f9f7 46 #else
<> 144:ef7eb2e8f9f7 47 #define UART_NUM 1
<> 144:ef7eb2e8f9f7 48 #endif
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 /******************************************************************************
<> 144:ef7eb2e8f9f7 51 * INITIALIZATION
<> 144:ef7eb2e8f9f7 52 ******************************************************************************/
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 static uint32_t serial_irq_ids[UART_NUM] = {0};
<> 144:ef7eb2e8f9f7 55 static uart_irq_handler irq_handler;
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 int stdio_uart_inited = 0;
<> 144:ef7eb2e8f9f7 58 serial_t stdio_uart;
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void serial_init(serial_t *obj, PinName tx, PinName rx) {
<> 144:ef7eb2e8f9f7 61 // determine the UART to use
<> 144:ef7eb2e8f9f7 62 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
<> 144:ef7eb2e8f9f7 63 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
<> 144:ef7eb2e8f9f7 64 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
<> 144:ef7eb2e8f9f7 65 MBED_ASSERT((int)uart != NC);
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 obj->uart = (UARTLP_Type *)uart;
<> 144:ef7eb2e8f9f7 68 // enable clk
<> 144:ef7eb2e8f9f7 69 switch (uart) {
<> 144:ef7eb2e8f9f7 70 case UART_0: if (mcgpllfll_frequency() != 0) //PLL/FLL is selected
<> 144:ef7eb2e8f9f7 71 SIM->SOPT2 |= (1<<SIM_SOPT2_UART0SRC_SHIFT);
<> 144:ef7eb2e8f9f7 72 else
<> 144:ef7eb2e8f9f7 73 SIM->SOPT2 |= (2<<SIM_SOPT2_UART0SRC_SHIFT);
<> 144:ef7eb2e8f9f7 74 SIM->SCGC4 |= SIM_SCGC4_UART0_MASK; break;
<> 144:ef7eb2e8f9f7 75 #if UART_NUM > 1
<> 144:ef7eb2e8f9f7 76 case UART_1: SIM->SCGC4 |= SIM_SCGC4_UART1_MASK; break;
<> 144:ef7eb2e8f9f7 77 case UART_2: SIM->SCGC4 |= SIM_SCGC4_UART2_MASK; break;
<> 144:ef7eb2e8f9f7 78 #endif
<> 144:ef7eb2e8f9f7 79 }
<> 144:ef7eb2e8f9f7 80 // Disable UART before changing registers
<> 144:ef7eb2e8f9f7 81 obj->uart->C2 &= ~(UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 // Enable UART transmitter to ensure TX activity is finished
<> 144:ef7eb2e8f9f7 84 obj->uart->C2 |= UARTLP_C2_TE_MASK;
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // Wait for TX activity to finish
<> 144:ef7eb2e8f9f7 87 while(!(obj->uart->S1 & UARTLP_S1_TC_MASK));
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 // Disbale UARTs again
<> 144:ef7eb2e8f9f7 90 obj->uart->C2 &= ~(UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK);
<> 144:ef7eb2e8f9f7 91
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 switch (uart) {
<> 144:ef7eb2e8f9f7 94 case UART_0: obj->index = 0; break;
<> 144:ef7eb2e8f9f7 95 #if UART_NUM > 1
<> 144:ef7eb2e8f9f7 96 case UART_1: obj->index = 1; break;
<> 144:ef7eb2e8f9f7 97 case UART_2: obj->index = 2; break;
<> 144:ef7eb2e8f9f7 98 #endif
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 // set default baud rate and format
<> 144:ef7eb2e8f9f7 102 serial_baud (obj, 9600);
<> 144:ef7eb2e8f9f7 103 serial_format(obj, 8, ParityNone, 1);
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 // pinout the chosen uart
<> 144:ef7eb2e8f9f7 106 pinmap_pinout(tx, PinMap_UART_TX);
<> 144:ef7eb2e8f9f7 107 pinmap_pinout(rx, PinMap_UART_RX);
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 // set rx/tx pins in PullUp mode and enable TX/RX
<> 144:ef7eb2e8f9f7 110 if (tx != NC) {
<> 144:ef7eb2e8f9f7 111 obj->uart->C2 |= UARTLP_C2_TE_MASK;
<> 144:ef7eb2e8f9f7 112 pin_mode(tx, PullUp);
<> 144:ef7eb2e8f9f7 113 }
<> 144:ef7eb2e8f9f7 114 if (rx != NC) {
<> 144:ef7eb2e8f9f7 115 obj->uart->C2 |= UARTLP_C2_RE_MASK;
<> 144:ef7eb2e8f9f7 116 pin_mode(rx, PullUp);
<> 144:ef7eb2e8f9f7 117 }
<> 144:ef7eb2e8f9f7 118
<> 144:ef7eb2e8f9f7 119 if (uart == STDIO_UART) {
<> 144:ef7eb2e8f9f7 120 stdio_uart_inited = 1;
<> 144:ef7eb2e8f9f7 121 memcpy(&stdio_uart, obj, sizeof(serial_t));
<> 144:ef7eb2e8f9f7 122 }
<> 144:ef7eb2e8f9f7 123 }
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 void serial_free(serial_t *obj) {
<> 144:ef7eb2e8f9f7 126 serial_irq_ids[obj->index] = 0;
<> 144:ef7eb2e8f9f7 127 }
<> 144:ef7eb2e8f9f7 128
<> 144:ef7eb2e8f9f7 129 // serial_baud
<> 144:ef7eb2e8f9f7 130 //
<> 144:ef7eb2e8f9f7 131 // set the baud rate, taking in to account the current SystemFrequency
<> 144:ef7eb2e8f9f7 132 void serial_baud(serial_t *obj, int baudrate) {
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 // save C2 state
<> 144:ef7eb2e8f9f7 135 uint8_t c2_state = (obj->uart->C2 & (UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK));
<> 144:ef7eb2e8f9f7 136
<> 144:ef7eb2e8f9f7 137 // Disable UART before changing registers
<> 144:ef7eb2e8f9f7 138 obj->uart->C2 &= ~(UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK);
<> 144:ef7eb2e8f9f7 139
<> 144:ef7eb2e8f9f7 140 uint32_t PCLK;
<> 144:ef7eb2e8f9f7 141 if (obj->uart == UART0) {
<> 144:ef7eb2e8f9f7 142 if (mcgpllfll_frequency() != 0)
<> 144:ef7eb2e8f9f7 143 PCLK = mcgpllfll_frequency();
<> 144:ef7eb2e8f9f7 144 else
<> 144:ef7eb2e8f9f7 145 PCLK = extosc_frequency();
<> 144:ef7eb2e8f9f7 146 } else
<> 144:ef7eb2e8f9f7 147 PCLK = bus_frequency();
<> 144:ef7eb2e8f9f7 148
<> 144:ef7eb2e8f9f7 149 // First we check to see if the basic divide with no DivAddVal/MulVal
<> 144:ef7eb2e8f9f7 150 // ratio gives us an integer result. If it does, we set DivAddVal = 0,
<> 144:ef7eb2e8f9f7 151 // MulVal = 1. Otherwise, we search the valid ratio value range to find
<> 144:ef7eb2e8f9f7 152 // the closest match. This could be more elegant, using search methods
<> 144:ef7eb2e8f9f7 153 // and/or lookup tables, but the brute force method is not that much
<> 144:ef7eb2e8f9f7 154 // slower, and is more maintainable.
<> 144:ef7eb2e8f9f7 155 uint16_t DL = PCLK / (16 * baudrate);
<> 144:ef7eb2e8f9f7 156
<> 144:ef7eb2e8f9f7 157 // set BDH and BDL
<> 144:ef7eb2e8f9f7 158 obj->uart->BDH = (obj->uart->BDH & ~(0x1f)) | ((DL >> 8) & 0x1f);
<> 144:ef7eb2e8f9f7 159 obj->uart->BDL = (obj->uart->BDL & ~(0xff)) | ((DL >> 0) & 0xff);
<> 144:ef7eb2e8f9f7 160
<> 144:ef7eb2e8f9f7 161 // restore C2 state
<> 144:ef7eb2e8f9f7 162 obj->uart->C2 |= c2_state;
<> 144:ef7eb2e8f9f7 163 }
<> 144:ef7eb2e8f9f7 164
<> 144:ef7eb2e8f9f7 165 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
<> 144:ef7eb2e8f9f7 166 MBED_ASSERT((stop_bits == 1) || (stop_bits == 2));
<> 144:ef7eb2e8f9f7 167 MBED_ASSERT((parity == ParityNone) || (parity == ParityOdd) || (parity == ParityEven));
<> 144:ef7eb2e8f9f7 168 MBED_ASSERT(data_bits == 8); // TODO: Support other number of data bits (also in the write method!)
<> 144:ef7eb2e8f9f7 169
<> 144:ef7eb2e8f9f7 170 // save C2 state
<> 144:ef7eb2e8f9f7 171 uint8_t c2_state = (obj->uart->C2 & (UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK));
<> 144:ef7eb2e8f9f7 172
<> 144:ef7eb2e8f9f7 173 // Disable UART before changing registers
<> 144:ef7eb2e8f9f7 174 obj->uart->C2 &= ~(UARTLP_C2_RE_MASK | UARTLP_C2_TE_MASK);
<> 144:ef7eb2e8f9f7 175
<> 144:ef7eb2e8f9f7 176
<> 144:ef7eb2e8f9f7 177 uint8_t parity_enable, parity_select;
<> 144:ef7eb2e8f9f7 178 switch (parity) {
<> 144:ef7eb2e8f9f7 179 case ParityNone: parity_enable = 0; parity_select = 0; break;
<> 144:ef7eb2e8f9f7 180 case ParityOdd : parity_enable = 1; parity_select = 1; data_bits++; break;
<> 144:ef7eb2e8f9f7 181 case ParityEven: parity_enable = 1; parity_select = 0; data_bits++; break;
<> 144:ef7eb2e8f9f7 182 default:
<> 144:ef7eb2e8f9f7 183 break;
<> 144:ef7eb2e8f9f7 184 }
<> 144:ef7eb2e8f9f7 185
<> 144:ef7eb2e8f9f7 186 stop_bits -= 1;
<> 144:ef7eb2e8f9f7 187
<> 144:ef7eb2e8f9f7 188 // data bits, parity and parity mode
<> 144:ef7eb2e8f9f7 189 obj->uart->C1 = ((parity_enable << 1)
<> 144:ef7eb2e8f9f7 190 | (parity_select << 0));
<> 144:ef7eb2e8f9f7 191
<> 144:ef7eb2e8f9f7 192 // stop bits
<> 144:ef7eb2e8f9f7 193 obj->uart->BDH &= ~UARTLP_BDH_SBNS_MASK;
<> 144:ef7eb2e8f9f7 194 obj->uart->BDH |= (stop_bits << UARTLP_BDH_SBNS_SHIFT);
<> 144:ef7eb2e8f9f7 195
<> 144:ef7eb2e8f9f7 196 // restore C2 state
<> 144:ef7eb2e8f9f7 197 obj->uart->C2 |= c2_state;
<> 144:ef7eb2e8f9f7 198 }
<> 144:ef7eb2e8f9f7 199
<> 144:ef7eb2e8f9f7 200 /******************************************************************************
<> 144:ef7eb2e8f9f7 201 * INTERRUPTS HANDLING
<> 144:ef7eb2e8f9f7 202 ******************************************************************************/
<> 144:ef7eb2e8f9f7 203 static inline void uart_irq(uint8_t status, uint32_t index) {
<> 144:ef7eb2e8f9f7 204 if (serial_irq_ids[index] != 0) {
<> 144:ef7eb2e8f9f7 205 if (status & UARTLP_S1_TDRE_MASK)
<> 144:ef7eb2e8f9f7 206 irq_handler(serial_irq_ids[index], TxIrq);
<> 144:ef7eb2e8f9f7 207
<> 144:ef7eb2e8f9f7 208 if (status & UARTLP_S1_RDRF_MASK)
<> 144:ef7eb2e8f9f7 209 irq_handler(serial_irq_ids[index], RxIrq);
<> 144:ef7eb2e8f9f7 210 }
<> 144:ef7eb2e8f9f7 211 }
<> 144:ef7eb2e8f9f7 212
<> 144:ef7eb2e8f9f7 213 void uart0_irq() {
<> 144:ef7eb2e8f9f7 214 uart_irq(UART0->S1, 0);
<> 144:ef7eb2e8f9f7 215 if (UART0->S1 & UARTLP_S1_OR_MASK)
<> 144:ef7eb2e8f9f7 216 UART0->S1 |= UARTLP_S1_OR_MASK;
<> 144:ef7eb2e8f9f7 217 }
<> 144:ef7eb2e8f9f7 218 #if UART_NUM > 1
<> 144:ef7eb2e8f9f7 219 void uart1_irq() {uart_irq(UART1->S1, 1);}
<> 144:ef7eb2e8f9f7 220 void uart2_irq() {uart_irq(UART2->S1, 2);}
<> 144:ef7eb2e8f9f7 221 #endif
<> 144:ef7eb2e8f9f7 222
<> 144:ef7eb2e8f9f7 223 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
<> 144:ef7eb2e8f9f7 224 irq_handler = handler;
<> 144:ef7eb2e8f9f7 225 serial_irq_ids[obj->index] = id;
<> 144:ef7eb2e8f9f7 226 }
<> 144:ef7eb2e8f9f7 227
<> 144:ef7eb2e8f9f7 228 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
<> 144:ef7eb2e8f9f7 229 IRQn_Type irq_n = (IRQn_Type)0;
<> 144:ef7eb2e8f9f7 230 uint32_t vector = 0;
<> 144:ef7eb2e8f9f7 231 switch ((int)obj->uart) {
<> 144:ef7eb2e8f9f7 232 case UART_0: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break;
<> 144:ef7eb2e8f9f7 233 #if UART_NUM > 1
<> 144:ef7eb2e8f9f7 234 case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break;
<> 144:ef7eb2e8f9f7 235 case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break;
<> 144:ef7eb2e8f9f7 236 #endif
<> 144:ef7eb2e8f9f7 237 }
<> 144:ef7eb2e8f9f7 238
<> 144:ef7eb2e8f9f7 239 if (enable) {
<> 144:ef7eb2e8f9f7 240 switch (irq) {
<> 144:ef7eb2e8f9f7 241 case RxIrq: obj->uart->C2 |= (UARTLP_C2_RIE_MASK); break;
<> 144:ef7eb2e8f9f7 242 case TxIrq: obj->uart->C2 |= (UARTLP_C2_TIE_MASK); break;
<> 144:ef7eb2e8f9f7 243 }
<> 144:ef7eb2e8f9f7 244 NVIC_SetVector(irq_n, vector);
<> 144:ef7eb2e8f9f7 245 NVIC_EnableIRQ(irq_n);
<> 144:ef7eb2e8f9f7 246
<> 144:ef7eb2e8f9f7 247 } else { // disable
<> 144:ef7eb2e8f9f7 248 int all_disabled = 0;
<> 144:ef7eb2e8f9f7 249 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
<> 144:ef7eb2e8f9f7 250 switch (irq) {
<> 144:ef7eb2e8f9f7 251 case RxIrq: obj->uart->C2 &= ~(UARTLP_C2_RIE_MASK); break;
<> 144:ef7eb2e8f9f7 252 case TxIrq: obj->uart->C2 &= ~(UARTLP_C2_TIE_MASK); break;
<> 144:ef7eb2e8f9f7 253 }
<> 144:ef7eb2e8f9f7 254 switch (other_irq) {
<> 144:ef7eb2e8f9f7 255 case RxIrq: all_disabled = (obj->uart->C2 & (UARTLP_C2_RIE_MASK)) == 0; break;
<> 144:ef7eb2e8f9f7 256 case TxIrq: all_disabled = (obj->uart->C2 & (UARTLP_C2_TIE_MASK)) == 0; break;
<> 144:ef7eb2e8f9f7 257 }
<> 144:ef7eb2e8f9f7 258 if (all_disabled)
<> 144:ef7eb2e8f9f7 259 NVIC_DisableIRQ(irq_n);
<> 144:ef7eb2e8f9f7 260 }
<> 144:ef7eb2e8f9f7 261 }
<> 144:ef7eb2e8f9f7 262
<> 144:ef7eb2e8f9f7 263 /******************************************************************************
<> 144:ef7eb2e8f9f7 264 * READ/WRITE
<> 144:ef7eb2e8f9f7 265 ******************************************************************************/
<> 144:ef7eb2e8f9f7 266 int serial_getc(serial_t *obj) {
<> 144:ef7eb2e8f9f7 267 while (!serial_readable(obj));
<> 144:ef7eb2e8f9f7 268 return obj->uart->D;
<> 144:ef7eb2e8f9f7 269 }
<> 144:ef7eb2e8f9f7 270
<> 144:ef7eb2e8f9f7 271 void serial_putc(serial_t *obj, int c) {
<> 144:ef7eb2e8f9f7 272 while (!serial_writable(obj));
<> 144:ef7eb2e8f9f7 273 obj->uart->D = c;
<> 144:ef7eb2e8f9f7 274 }
<> 144:ef7eb2e8f9f7 275
<> 144:ef7eb2e8f9f7 276 int serial_readable(serial_t *obj) {
<> 144:ef7eb2e8f9f7 277 // check overrun
<> 144:ef7eb2e8f9f7 278 if (obj->uart->S1 & UARTLP_S1_OR_MASK) {
<> 144:ef7eb2e8f9f7 279 obj->uart->S1 |= UARTLP_S1_OR_MASK;
<> 144:ef7eb2e8f9f7 280 }
<> 144:ef7eb2e8f9f7 281 return (obj->uart->S1 & UARTLP_S1_RDRF_MASK);
<> 144:ef7eb2e8f9f7 282 }
<> 144:ef7eb2e8f9f7 283
<> 144:ef7eb2e8f9f7 284 int serial_writable(serial_t *obj) {
<> 144:ef7eb2e8f9f7 285 // check overrun
<> 144:ef7eb2e8f9f7 286 if (obj->uart->S1 & UARTLP_S1_OR_MASK) {
<> 144:ef7eb2e8f9f7 287 obj->uart->S1 |= UARTLP_S1_OR_MASK;
<> 144:ef7eb2e8f9f7 288 }
<> 144:ef7eb2e8f9f7 289 return (obj->uart->S1 & UARTLP_S1_TDRE_MASK);
<> 144:ef7eb2e8f9f7 290 }
<> 144:ef7eb2e8f9f7 291
<> 144:ef7eb2e8f9f7 292 void serial_clear(serial_t *obj) {
<> 144:ef7eb2e8f9f7 293 }
<> 144:ef7eb2e8f9f7 294
<> 144:ef7eb2e8f9f7 295 void serial_pinout_tx(PinName tx) {
<> 144:ef7eb2e8f9f7 296 pinmap_pinout(tx, PinMap_UART_TX);
<> 144:ef7eb2e8f9f7 297 }
<> 144:ef7eb2e8f9f7 298
<> 144:ef7eb2e8f9f7 299 void serial_break_set(serial_t *obj) {
<> 144:ef7eb2e8f9f7 300 obj->uart->C2 |= UARTLP_C2_SBK_MASK;
<> 144:ef7eb2e8f9f7 301 }
<> 144:ef7eb2e8f9f7 302
<> 144:ef7eb2e8f9f7 303 void serial_break_clear(serial_t *obj) {
<> 144:ef7eb2e8f9f7 304 obj->uart->C2 &= ~UARTLP_C2_SBK_MASK;
<> 144:ef7eb2e8f9f7 305 }