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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/serial_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
104:a6a92e2e5a92 
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 104:a6a92e2e5a92 2 * Copyright (c) 2013 Nordic Semiconductor
mbed_official 85:e1a8e879a6a9 3 *
mbed_official 85:e1a8e879a6a9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 85:e1a8e879a6a9 5 * you may not use this file except in compliance with the License.
mbed_official 85:e1a8e879a6a9 6 * You may obtain a copy of the License at
mbed_official 85:e1a8e879a6a9 7 *
mbed_official 85:e1a8e879a6a9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 85:e1a8e879a6a9 9 *
mbed_official 85:e1a8e879a6a9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 85:e1a8e879a6a9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 85:e1a8e879a6a9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 85:e1a8e879a6a9 13 * See the License for the specific language governing permissions and
mbed_official 85:e1a8e879a6a9 14 * limitations under the License.
mbed_official 85:e1a8e879a6a9 15 */
mbed_official 85:e1a8e879a6a9 16 // math.h required for floating point operations for baud rate calculation
mbed_official 85:e1a8e879a6a9 17 //#include <math.h>
mbed_official 85:e1a8e879a6a9 18 #include <string.h>
mbed_official 227:7bd0639b8911 19 #include "mbed_assert.h"
mbed_official 85:e1a8e879a6a9 20
mbed_official 85:e1a8e879a6a9 21 #include "serial_api.h"
mbed_official 85:e1a8e879a6a9 22 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 23 #include "pinmap.h"
mbed_official 227:7bd0639b8911 24
mbed_official 85:e1a8e879a6a9 25 /******************************************************************************
mbed_official 85:e1a8e879a6a9 26 * INITIALIZATION
mbed_official 85:e1a8e879a6a9 27 ******************************************************************************/
mbed_official 85:e1a8e879a6a9 28 #define UART_NUM 1
mbed_official 85:e1a8e879a6a9 29
mbed_official 85:e1a8e879a6a9 30 static const PinMap PinMap_UART_TX[] = {
mbed_official 85:e1a8e879a6a9 31 {TX_PIN_NUMBER, UART_0, 1},
mbed_official 85:e1a8e879a6a9 32 { NC , NC , 0}
mbed_official 85:e1a8e879a6a9 33 };
mbed_official 85:e1a8e879a6a9 34
mbed_official 85:e1a8e879a6a9 35 static const PinMap PinMap_UART_RX[] = {
mbed_official 85:e1a8e879a6a9 36 {RX_PIN_NUMBER, UART_0, 1},
mbed_official 85:e1a8e879a6a9 37 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 38 };
mbed_official 85:e1a8e879a6a9 39
mbed_official 85:e1a8e879a6a9 40 static uint32_t serial_irq_ids[UART_NUM] = {0};
mbed_official 85:e1a8e879a6a9 41 static uart_irq_handler irq_handler;
mbed_official 85:e1a8e879a6a9 42 static uint32_t acceptedSpeeds[16][2] = {{1200,UART_BAUDRATE_BAUDRATE_Baud1200},
mbed_official 85:e1a8e879a6a9 43 {2400,UART_BAUDRATE_BAUDRATE_Baud2400},
mbed_official 85:e1a8e879a6a9 44 {4800,UART_BAUDRATE_BAUDRATE_Baud4800},
mbed_official 85:e1a8e879a6a9 45 {9600,UART_BAUDRATE_BAUDRATE_Baud9600},
mbed_official 85:e1a8e879a6a9 46 {14400,UART_BAUDRATE_BAUDRATE_Baud14400},
mbed_official 85:e1a8e879a6a9 47 {19200,UART_BAUDRATE_BAUDRATE_Baud19200},
mbed_official 85:e1a8e879a6a9 48 {28800,UART_BAUDRATE_BAUDRATE_Baud28800},
mbed_official 85:e1a8e879a6a9 49 {38400,UART_BAUDRATE_BAUDRATE_Baud38400},
mbed_official 85:e1a8e879a6a9 50 {57600,UART_BAUDRATE_BAUDRATE_Baud57600},
mbed_official 85:e1a8e879a6a9 51 {76800,UART_BAUDRATE_BAUDRATE_Baud76800},
mbed_official 85:e1a8e879a6a9 52 {115200,UART_BAUDRATE_BAUDRATE_Baud115200},
mbed_official 85:e1a8e879a6a9 53 {230400,UART_BAUDRATE_BAUDRATE_Baud230400},
mbed_official 85:e1a8e879a6a9 54 {250000,UART_BAUDRATE_BAUDRATE_Baud250000},
mbed_official 85:e1a8e879a6a9 55 {460800,UART_BAUDRATE_BAUDRATE_Baud460800},
mbed_official 85:e1a8e879a6a9 56 {921600,UART_BAUDRATE_BAUDRATE_Baud921600},
mbed_official 85:e1a8e879a6a9 57 {1000000,UART_BAUDRATE_BAUDRATE_Baud1M}};
mbed_official 85:e1a8e879a6a9 58
mbed_official 85:e1a8e879a6a9 59 int stdio_uart_inited = 0;
mbed_official 85:e1a8e879a6a9 60 serial_t stdio_uart;
mbed_official 85:e1a8e879a6a9 61
mbed_official 85:e1a8e879a6a9 62
mbed_official 85:e1a8e879a6a9 63 void serial_init(serial_t *obj, PinName tx, PinName rx) {
mbed_official 85:e1a8e879a6a9 64 // determine the UART to use -- for mcu's with multiple uart connections
mbed_official 85:e1a8e879a6a9 65 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
mbed_official 85:e1a8e879a6a9 66 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
mbed_official 85:e1a8e879a6a9 67 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
mbed_official 85:e1a8e879a6a9 68
mbed_official 227:7bd0639b8911 69 MBED_ASSERT((int)uart != NC);
mbed_official 85:e1a8e879a6a9 70
mbed_official 85:e1a8e879a6a9 71 obj->uart = (NRF_UART_Type *)uart;
mbed_official 85:e1a8e879a6a9 72
mbed_official 227:7bd0639b8911 73 //pin configurations --
mbed_official 227:7bd0639b8911 74 //outputs
mbed_official 85:e1a8e879a6a9 75 NRF_GPIO->DIR |= (1<<tx);//TX_PIN_NUMBER);
mbed_official 85:e1a8e879a6a9 76 NRF_GPIO->DIR |= (1<<RTS_PIN_NUMBER);
mbed_official 85:e1a8e879a6a9 77
mbed_official 85:e1a8e879a6a9 78 NRF_GPIO->DIR &= ~(1<<rx);//RX_PIN_NUMBER);
mbed_official 85:e1a8e879a6a9 79 NRF_GPIO->DIR &= ~(1<<CTS_PIN_NUMBER);
mbed_official 85:e1a8e879a6a9 80
mbed_official 85:e1a8e879a6a9 81 obj->uart->PSELRTS = RTS_PIN_NUMBER;
mbed_official 85:e1a8e879a6a9 82 obj->uart->PSELTXD = tx;//TX_PIN_NUMBER;
mbed_official 85:e1a8e879a6a9 83
mbed_official 85:e1a8e879a6a9 84 //inputs
mbed_official 85:e1a8e879a6a9 85 obj->uart->PSELCTS = CTS_PIN_NUMBER;
mbed_official 85:e1a8e879a6a9 86 obj->uart->PSELRXD = rx;//RX_PIN_NUMBER;
mbed_official 85:e1a8e879a6a9 87
mbed_official 85:e1a8e879a6a9 88
mbed_official 85:e1a8e879a6a9 89 // set default baud rate and format
mbed_official 85:e1a8e879a6a9 90 serial_baud (obj, 9600);
mbed_official 85:e1a8e879a6a9 91 serial_format(obj, 8, ParityNone, 1);
mbed_official 85:e1a8e879a6a9 92
mbed_official 85:e1a8e879a6a9 93 obj->uart->ENABLE = (UART_ENABLE_ENABLE_Enabled << UART_ENABLE_ENABLE_Pos);;
mbed_official 85:e1a8e879a6a9 94 obj->uart->TASKS_STARTTX = 1;
mbed_official 85:e1a8e879a6a9 95 obj->uart->TASKS_STARTRX = 1;
mbed_official 85:e1a8e879a6a9 96 obj->uart->EVENTS_RXDRDY =0;
mbed_official 85:e1a8e879a6a9 97
mbed_official 85:e1a8e879a6a9 98 obj->index = 0;
mbed_official 85:e1a8e879a6a9 99
mbed_official 85:e1a8e879a6a9 100 // set rx/tx pins in PullUp mode
mbed_official 85:e1a8e879a6a9 101 pin_mode(tx, PullUp);
mbed_official 85:e1a8e879a6a9 102 pin_mode(rx, PullUp);
mbed_official 85:e1a8e879a6a9 103
mbed_official 85:e1a8e879a6a9 104 if (uart == STDIO_UART) {
mbed_official 85:e1a8e879a6a9 105 stdio_uart_inited = 1;
mbed_official 85:e1a8e879a6a9 106 memcpy(&stdio_uart, obj, sizeof(serial_t));
mbed_official 85:e1a8e879a6a9 107 }
mbed_official 85:e1a8e879a6a9 108 }
mbed_official 85:e1a8e879a6a9 109
mbed_official 85:e1a8e879a6a9 110 void serial_free(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 111 serial_irq_ids[obj->index] = 0;
mbed_official 85:e1a8e879a6a9 112 }
mbed_official 85:e1a8e879a6a9 113
mbed_official 85:e1a8e879a6a9 114 // serial_baud
mbed_official 85:e1a8e879a6a9 115 // set the baud rate, taking in to account the current SystemFrequency
mbed_official 85:e1a8e879a6a9 116 void serial_baud(serial_t *obj, int baudrate) {
mbed_official 85:e1a8e879a6a9 117 if(baudrate<=1200){
mbed_official 85:e1a8e879a6a9 118 obj->uart->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1200;
mbed_official 85:e1a8e879a6a9 119 return;
mbed_official 227:7bd0639b8911 120 }
mbed_official 85:e1a8e879a6a9 121
mbed_official 227:7bd0639b8911 122 for(int i=1;i<16;i++){
mbed_official 85:e1a8e879a6a9 123 if(baudrate<acceptedSpeeds[i][0]){
mbed_official 85:e1a8e879a6a9 124 obj->uart->BAUDRATE = acceptedSpeeds[i-1][1];
mbed_official 85:e1a8e879a6a9 125 return;
mbed_official 85:e1a8e879a6a9 126 }
mbed_official 85:e1a8e879a6a9 127 }
mbed_official 85:e1a8e879a6a9 128 obj->uart->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1M;
mbed_official 85:e1a8e879a6a9 129 }
mbed_official 85:e1a8e879a6a9 130
mbed_official 85:e1a8e879a6a9 131 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
mbed_official 85:e1a8e879a6a9 132 // 0: 1 stop bits, 1: 2 stop bits
mbed_official 85:e1a8e879a6a9 133 // int parity_enable, parity_select;
mbed_official 85:e1a8e879a6a9 134 switch (parity) {
mbed_official 227:7bd0639b8911 135 case ParityNone:
mbed_official 85:e1a8e879a6a9 136 obj->uart->CONFIG = 0;
mbed_official 85:e1a8e879a6a9 137 break;
mbed_official 85:e1a8e879a6a9 138 default:
mbed_official 85:e1a8e879a6a9 139 obj->uart->CONFIG = (UART_CONFIG_PARITY_Included<<UART_CONFIG_PARITY_Pos);
mbed_official 85:e1a8e879a6a9 140 return;
mbed_official 85:e1a8e879a6a9 141 }
mbed_official 85:e1a8e879a6a9 142 //no Flow Control
mbed_official 85:e1a8e879a6a9 143 }
mbed_official 85:e1a8e879a6a9 144
mbed_official 85:e1a8e879a6a9 145 //******************************************************************************
mbed_official 85:e1a8e879a6a9 146 // * INTERRUPT HANDLING
mbed_official 85:e1a8e879a6a9 147 //******************************************************************************
mbed_official 85:e1a8e879a6a9 148 static inline void uart_irq(uint32_t iir, uint32_t index) {
mbed_official 85:e1a8e879a6a9 149 SerialIrq irq_type;
mbed_official 85:e1a8e879a6a9 150 switch (iir) {
mbed_official 227:7bd0639b8911 151 case 1:
mbed_official 227:7bd0639b8911 152 irq_type = TxIrq;
mbed_official 85:e1a8e879a6a9 153 break;
mbed_official 227:7bd0639b8911 154 case 2:
mbed_official 227:7bd0639b8911 155 irq_type = RxIrq;
mbed_official 85:e1a8e879a6a9 156 break;
mbed_official 85:e1a8e879a6a9 157
mbed_official 85:e1a8e879a6a9 158 default: return;
mbed_official 85:e1a8e879a6a9 159 }
mbed_official 85:e1a8e879a6a9 160
mbed_official 85:e1a8e879a6a9 161 if (serial_irq_ids[index] != 0){
mbed_official 85:e1a8e879a6a9 162 irq_handler(serial_irq_ids[index], irq_type);
mbed_official 85:e1a8e879a6a9 163 }
mbed_official 85:e1a8e879a6a9 164 }
mbed_official 85:e1a8e879a6a9 165 #ifdef __cplusplus
mbed_official 85:e1a8e879a6a9 166 extern "C" {
mbed_official 227:7bd0639b8911 167 #endif
mbed_official 85:e1a8e879a6a9 168 void UART0_IRQHandler()
mbed_official 85:e1a8e879a6a9 169 {
mbed_official 85:e1a8e879a6a9 170 uint32_t irtype =0;
mbed_official 85:e1a8e879a6a9 171
mbed_official 85:e1a8e879a6a9 172 if(NRF_UART0->EVENTS_TXDRDY){
mbed_official 85:e1a8e879a6a9 173 irtype =1;
mbed_official 85:e1a8e879a6a9 174 }
mbed_official 85:e1a8e879a6a9 175 else if(NRF_UART0->EVENTS_RXDRDY){
mbed_official 85:e1a8e879a6a9 176 irtype =2;
mbed_official 85:e1a8e879a6a9 177 }
mbed_official 85:e1a8e879a6a9 178 uart_irq(irtype, 0);
mbed_official 85:e1a8e879a6a9 179 }
mbed_official 85:e1a8e879a6a9 180 #ifdef __cplusplus
mbed_official 85:e1a8e879a6a9 181 }
mbed_official 227:7bd0639b8911 182 #endif
mbed_official 85:e1a8e879a6a9 183 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
mbed_official 85:e1a8e879a6a9 184 irq_handler = handler;
mbed_official 85:e1a8e879a6a9 185 serial_irq_ids[obj->index] = id;
mbed_official 85:e1a8e879a6a9 186 }
mbed_official 85:e1a8e879a6a9 187
mbed_official 85:e1a8e879a6a9 188 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
mbed_official 85:e1a8e879a6a9 189 IRQn_Type irq_n = (IRQn_Type)0;
mbed_official 85:e1a8e879a6a9 190
mbed_official 85:e1a8e879a6a9 191 switch ((int)obj->uart) {
mbed_official 85:e1a8e879a6a9 192 case UART_0: irq_n=UART0_IRQn ;
mbed_official 85:e1a8e879a6a9 193 break;
mbed_official 85:e1a8e879a6a9 194 }
mbed_official 85:e1a8e879a6a9 195
mbed_official 85:e1a8e879a6a9 196 if (enable) {
mbed_official 85:e1a8e879a6a9 197 switch (irq) {
mbed_official 85:e1a8e879a6a9 198 case RxIrq: obj->uart->INTENSET |= (UART_INTENSET_RXDRDY_Msk);break;
mbed_official 85:e1a8e879a6a9 199 case TxIrq: obj->uart->INTENSET |= (UART_INTENSET_TXDRDY_Msk);break;
mbed_official 85:e1a8e879a6a9 200 }
mbed_official 85:e1a8e879a6a9 201 NVIC_SetPriority(irq_n, 3);
mbed_official 85:e1a8e879a6a9 202 NVIC_EnableIRQ(irq_n);
mbed_official 85:e1a8e879a6a9 203 }
mbed_official 85:e1a8e879a6a9 204 else { // disable
mbed_official 85:e1a8e879a6a9 205 int all_disabled = 0;
mbed_official 85:e1a8e879a6a9 206 switch (irq) {
mbed_official 85:e1a8e879a6a9 207 case RxIrq: obj->uart->INTENSET &= ~(UART_INTENSET_RXDRDY_Msk);
mbed_official 85:e1a8e879a6a9 208 all_disabled = (obj->uart->INTENSET& (UART_INTENSET_TXDRDY_Msk))==0;
mbed_official 85:e1a8e879a6a9 209 break;
mbed_official 85:e1a8e879a6a9 210 case TxIrq: obj->uart->INTENSET &= ~(UART_INTENSET_TXDRDY_Msk);
mbed_official 85:e1a8e879a6a9 211 all_disabled = (obj->uart->INTENSET& (UART_INTENSET_RXDRDY_Msk))==0;
mbed_official 85:e1a8e879a6a9 212 break;
mbed_official 85:e1a8e879a6a9 213 }
mbed_official 85:e1a8e879a6a9 214
mbed_official 85:e1a8e879a6a9 215 if (all_disabled){
mbed_official 85:e1a8e879a6a9 216 NVIC_DisableIRQ(irq_n);
mbed_official 85:e1a8e879a6a9 217 }
mbed_official 85:e1a8e879a6a9 218 }
mbed_official 85:e1a8e879a6a9 219 }
mbed_official 85:e1a8e879a6a9 220
mbed_official 85:e1a8e879a6a9 221 //******************************************************************************
mbed_official 85:e1a8e879a6a9 222 //* READ/WRITE
mbed_official 85:e1a8e879a6a9 223 //******************************************************************************
mbed_official 85:e1a8e879a6a9 224 int serial_getc(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 225 while (!serial_readable(obj));
mbed_official 85:e1a8e879a6a9 226
mbed_official 85:e1a8e879a6a9 227 obj->uart->EVENTS_RXDRDY = 0;
mbed_official 85:e1a8e879a6a9 228
mbed_official 85:e1a8e879a6a9 229 return (uint8_t)obj->uart->RXD;
mbed_official 85:e1a8e879a6a9 230 }
mbed_official 85:e1a8e879a6a9 231
mbed_official 85:e1a8e879a6a9 232 void serial_putc(serial_t *obj, int c) {
mbed_official 85:e1a8e879a6a9 233 obj->uart->TXD = (uint8_t)c;
mbed_official 85:e1a8e879a6a9 234
mbed_official 85:e1a8e879a6a9 235 while (!serial_writable(obj));
mbed_official 85:e1a8e879a6a9 236
mbed_official 85:e1a8e879a6a9 237 obj->uart->EVENTS_TXDRDY =0;
mbed_official 85:e1a8e879a6a9 238 }
mbed_official 85:e1a8e879a6a9 239
mbed_official 85:e1a8e879a6a9 240 int serial_readable(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 241 return (obj->uart->EVENTS_RXDRDY == 1);
mbed_official 85:e1a8e879a6a9 242 }
mbed_official 85:e1a8e879a6a9 243
mbed_official 85:e1a8e879a6a9 244 int serial_writable(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 245 return (obj->uart->EVENTS_TXDRDY ==1);
mbed_official 85:e1a8e879a6a9 246 }
mbed_official 85:e1a8e879a6a9 247
mbed_official 85:e1a8e879a6a9 248 void serial_break_set(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 249 obj->uart->TASKS_SUSPEND = 1;
mbed_official 85:e1a8e879a6a9 250 }
mbed_official 85:e1a8e879a6a9 251
mbed_official 85:e1a8e879a6a9 252 void serial_break_clear(serial_t *obj) {
mbed_official 85:e1a8e879a6a9 253 obj->uart->TASKS_STARTTX = 1;
mbed_official 85:e1a8e879a6a9 254 obj->uart->TASKS_STARTRX = 1;
mbed_official 85:e1a8e879a6a9 255 }