Bernhard Filzmaier / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11U6X/serial_api.c@186:2e805bf06ee4, 2014-05-12 (annotated)

Committer:
mbed_official
Date:
Mon May 12 10:15:06 2014 +0100
Revision:
186:2e805bf06ee4
Parent:
174:8bb9f3a33240
Child:
220:aa774fb95d17
Synchronized with git revision f41d1e8383b601b353319ce36d53b9b84fb476a3



Full URL: https://github.com/mbedmicro/mbed/commit/f41d1e8383b601b353319ce36d53b9b84fb476a3/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 174:8bb9f3a33240 1 /* mbed Microcontroller Library
mbed_official 174:8bb9f3a33240 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 174:8bb9f3a33240 3 *
mbed_official 174:8bb9f3a33240 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 174:8bb9f3a33240 5 * you may not use this file except in compliance with the License.
mbed_official 174:8bb9f3a33240 6 * You may obtain a copy of the License at
mbed_official 174:8bb9f3a33240 7 *
mbed_official 174:8bb9f3a33240 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 174:8bb9f3a33240 9 *
mbed_official 174:8bb9f3a33240 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 174:8bb9f3a33240 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 174:8bb9f3a33240 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 174:8bb9f3a33240 13 * See the License for the specific language governing permissions and
mbed_official 174:8bb9f3a33240 14 * limitations under the License.
mbed_official 174:8bb9f3a33240 15 */
mbed_official 174:8bb9f3a33240 16 // math.h required for floating point operations for baud rate calculation
mbed_official 174:8bb9f3a33240 17 #include <math.h>
mbed_official 174:8bb9f3a33240 18 #include <string.h>
mbed_official 174:8bb9f3a33240 19 #include <stdlib.h>
mbed_official 174:8bb9f3a33240 20
mbed_official 174:8bb9f3a33240 21 #include "serial_api.h"
mbed_official 174:8bb9f3a33240 22 #include "cmsis.h"
mbed_official 174:8bb9f3a33240 23 #include "pinmap.h"
mbed_official 174:8bb9f3a33240 24 #include "error.h"
mbed_official 174:8bb9f3a33240 25
mbed_official 174:8bb9f3a33240 26 #if DEVICE_SERIAL
mbed_official 174:8bb9f3a33240 27 #warning "[TODO] support from UART_1 to UART_4"
mbed_official 174:8bb9f3a33240 28 /******************************************************************************
mbed_official 174:8bb9f3a33240 29 * INITIALIZATION
mbed_official 174:8bb9f3a33240 30 ******************************************************************************/
mbed_official 174:8bb9f3a33240 31
mbed_official 186:2e805bf06ee4 32 #define UART_NUM 1
mbed_official 174:8bb9f3a33240 33
mbed_official 174:8bb9f3a33240 34 static const PinMap PinMap_UART_TX[] = {
mbed_official 174:8bb9f3a33240 35 {P0_19, UART_0, 1},
mbed_official 174:8bb9f3a33240 36 {P1_18, UART_0, 2},
mbed_official 174:8bb9f3a33240 37 {P1_27, UART_0, 2},
mbed_official 186:2e805bf06ee4 38 // {P1_18, UART_1, 2},
mbed_official 186:2e805bf06ee4 39 // {P1_0 , UART_2, 3},
mbed_official 186:2e805bf06ee4 40 // {P1_23, UART_2, 3},
mbed_official 186:2e805bf06ee4 41 // {P2_4 , UART_3, 1},
mbed_official 186:2e805bf06ee4 42 // {P2_12, UART_4, 1},
mbed_official 174:8bb9f3a33240 43 { NC , NC , 0}
mbed_official 174:8bb9f3a33240 44 };
mbed_official 174:8bb9f3a33240 45
mbed_official 174:8bb9f3a33240 46 static const PinMap PinMap_UART_RX[] = {
mbed_official 174:8bb9f3a33240 47 {P0_18, UART_0, 1},
mbed_official 174:8bb9f3a33240 48 {P1_17, UART_0, 2},
mbed_official 174:8bb9f3a33240 49 {P1_26, UART_0, 2},
mbed_official 186:2e805bf06ee4 50 // {P1_2 , UART_1, 3},
mbed_official 186:2e805bf06ee4 51 // {P0_20, UART_2, 2},
mbed_official 186:2e805bf06ee4 52 // {P1_6 , UART_2, 2},
mbed_official 186:2e805bf06ee4 53 // {P2_3 , UART_3, 1},
mbed_official 186:2e805bf06ee4 54 // {P2_11, UART_4, 1},
mbed_official 174:8bb9f3a33240 55 {NC , NC , 0}
mbed_official 174:8bb9f3a33240 56 };
mbed_official 174:8bb9f3a33240 57
mbed_official 174:8bb9f3a33240 58 static uint32_t serial_irq_ids[UART_NUM] = {0};
mbed_official 174:8bb9f3a33240 59 static uart_irq_handler irq_handler;
mbed_official 174:8bb9f3a33240 60
mbed_official 174:8bb9f3a33240 61 int stdio_uart_inited = 0;
mbed_official 174:8bb9f3a33240 62 serial_t stdio_uart;
mbed_official 174:8bb9f3a33240 63
mbed_official 174:8bb9f3a33240 64 void serial_init(serial_t *obj, PinName tx, PinName rx) {
mbed_official 174:8bb9f3a33240 65 int is_stdio_uart = 0;
mbed_official 174:8bb9f3a33240 66
mbed_official 174:8bb9f3a33240 67 // determine the UART to use
mbed_official 174:8bb9f3a33240 68 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
mbed_official 174:8bb9f3a33240 69 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
mbed_official 174:8bb9f3a33240 70 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
mbed_official 174:8bb9f3a33240 71 if ((int)uart == NC) {
mbed_official 174:8bb9f3a33240 72 error("Serial pinout mapping failed");
mbed_official 174:8bb9f3a33240 73 }
mbed_official 174:8bb9f3a33240 74
mbed_official 174:8bb9f3a33240 75 obj->uart = (LPC_USART0_Type *)uart;
mbed_official 174:8bb9f3a33240 76 LPC_SYSCON->SYSAHBCLKCTRL |= ((1<<12) | (1<<20) | (1<<21) | (1<<22));
mbed_official 174:8bb9f3a33240 77
mbed_official 174:8bb9f3a33240 78 // [TODO] Consider more elegant approach
mbed_official 174:8bb9f3a33240 79 // disconnect USBTX/RX mapping mux, for case when switching ports
mbed_official 174:8bb9f3a33240 80 #ifdef USBTX
mbed_official 174:8bb9f3a33240 81 pin_function(USBTX, 0);
mbed_official 174:8bb9f3a33240 82 pin_function(USBRX, 0);
mbed_official 174:8bb9f3a33240 83 #endif
mbed_official 174:8bb9f3a33240 84
mbed_official 174:8bb9f3a33240 85 // enable fifos and default rx trigger level
mbed_official 174:8bb9f3a33240 86 obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
mbed_official 174:8bb9f3a33240 87 | 0 << 1 // Rx Fifo Clear
mbed_official 174:8bb9f3a33240 88 | 0 << 2 // Tx Fifo Clear
mbed_official 174:8bb9f3a33240 89 | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
mbed_official 174:8bb9f3a33240 90
mbed_official 174:8bb9f3a33240 91 // disable irqs
mbed_official 174:8bb9f3a33240 92 obj->uart->IER = 0 << 0 // Rx Data available irq enable
mbed_official 174:8bb9f3a33240 93 | 0 << 1 // Tx Fifo empty irq enable
mbed_official 174:8bb9f3a33240 94 | 0 << 2; // Rx Line Status irq enable
mbed_official 174:8bb9f3a33240 95
mbed_official 174:8bb9f3a33240 96 // set default baud rate and format
mbed_official 174:8bb9f3a33240 97 serial_baud (obj, 9600);
mbed_official 174:8bb9f3a33240 98 serial_format(obj, 8, ParityNone, 1);
mbed_official 174:8bb9f3a33240 99
mbed_official 174:8bb9f3a33240 100 // pinout the chosen uart
mbed_official 174:8bb9f3a33240 101 pinmap_pinout(tx, PinMap_UART_TX);
mbed_official 174:8bb9f3a33240 102 pinmap_pinout(rx, PinMap_UART_RX);
mbed_official 174:8bb9f3a33240 103
mbed_official 174:8bb9f3a33240 104 // set rx/tx pins in PullUp mode
mbed_official 174:8bb9f3a33240 105 pin_mode(tx, PullUp);
mbed_official 174:8bb9f3a33240 106 pin_mode(rx, PullUp);
mbed_official 174:8bb9f3a33240 107
mbed_official 174:8bb9f3a33240 108 switch (uart) {
mbed_official 174:8bb9f3a33240 109 case UART_0: obj->index = 0; break;
mbed_official 174:8bb9f3a33240 110 case UART_1: obj->index = 1; break;
mbed_official 174:8bb9f3a33240 111 case UART_2: obj->index = 2; break;
mbed_official 174:8bb9f3a33240 112 case UART_3: obj->index = 3; break;
mbed_official 174:8bb9f3a33240 113 case UART_4: obj->index = 4; break;
mbed_official 174:8bb9f3a33240 114 }
mbed_official 174:8bb9f3a33240 115
mbed_official 174:8bb9f3a33240 116 is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
mbed_official 174:8bb9f3a33240 117
mbed_official 174:8bb9f3a33240 118 if (is_stdio_uart) {
mbed_official 174:8bb9f3a33240 119 stdio_uart_inited = 1;
mbed_official 174:8bb9f3a33240 120 memcpy(&stdio_uart, obj, sizeof(serial_t));
mbed_official 174:8bb9f3a33240 121 }
mbed_official 174:8bb9f3a33240 122 }
mbed_official 174:8bb9f3a33240 123
mbed_official 174:8bb9f3a33240 124 void serial_free(serial_t *obj) {
mbed_official 174:8bb9f3a33240 125 serial_irq_ids[obj->index] = 0;
mbed_official 174:8bb9f3a33240 126 }
mbed_official 174:8bb9f3a33240 127
mbed_official 174:8bb9f3a33240 128 // serial_baud
mbed_official 174:8bb9f3a33240 129 // set the baud rate, taking in to account the current SystemFrequency
mbed_official 174:8bb9f3a33240 130 void serial_baud(serial_t *obj, int baudrate) {
mbed_official 174:8bb9f3a33240 131 LPC_SYSCON->USART0CLKDIV = 0x1;
mbed_official 186:2e805bf06ee4 132 uint32_t PCLK = SystemCoreClock;
mbed_official 174:8bb9f3a33240 133 // First we check to see if the basic divide with no DivAddVal/MulVal
mbed_official 174:8bb9f3a33240 134 // ratio gives us an integer result. If it does, we set DivAddVal = 0,
mbed_official 174:8bb9f3a33240 135 // MulVal = 1. Otherwise, we search the valid ratio value range to find
mbed_official 174:8bb9f3a33240 136 // the closest match. This could be more elegant, using search methods
mbed_official 174:8bb9f3a33240 137 // and/or lookup tables, but the brute force method is not that much
mbed_official 174:8bb9f3a33240 138 // slower, and is more maintainable.
mbed_official 174:8bb9f3a33240 139 uint16_t DL = PCLK / (16 * baudrate);
mbed_official 174:8bb9f3a33240 140
mbed_official 174:8bb9f3a33240 141 uint8_t DivAddVal = 0;
mbed_official 174:8bb9f3a33240 142 uint8_t MulVal = 1;
mbed_official 174:8bb9f3a33240 143 int hit = 0;
mbed_official 174:8bb9f3a33240 144 uint16_t dlv;
mbed_official 174:8bb9f3a33240 145 uint8_t mv, dav;
mbed_official 174:8bb9f3a33240 146 if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
mbed_official 174:8bb9f3a33240 147 int err_best = baudrate, b;
mbed_official 174:8bb9f3a33240 148 for (mv = 1; mv < 16 && !hit; mv++)
mbed_official 174:8bb9f3a33240 149 {
mbed_official 174:8bb9f3a33240 150 for (dav = 0; dav < mv; dav++)
mbed_official 174:8bb9f3a33240 151 {
mbed_official 174:8bb9f3a33240 152 // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul))
mbed_official 174:8bb9f3a33240 153 // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul))
mbed_official 174:8bb9f3a33240 154 // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding
mbed_official 174:8bb9f3a33240 155 // for many values of mul and PCLK we have 2 or more bits of headroom which can be used to improve precision
mbed_official 174:8bb9f3a33240 156 // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding
mbed_official 174:8bb9f3a33240 157
mbed_official 174:8bb9f3a33240 158 if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom
mbed_official 174:8bb9f3a33240 159 dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2;
mbed_official 174:8bb9f3a33240 160 else // 2 bits headroom, use more precision
mbed_official 174:8bb9f3a33240 161 dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2;
mbed_official 174:8bb9f3a33240 162
mbed_official 174:8bb9f3a33240 163 // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood
mbed_official 174:8bb9f3a33240 164 if (dlv == 0)
mbed_official 174:8bb9f3a33240 165 dlv = 1;
mbed_official 174:8bb9f3a33240 166
mbed_official 174:8bb9f3a33240 167 // datasheet says if dav > 0 then DL must be >= 2
mbed_official 174:8bb9f3a33240 168 if ((dav > 0) && (dlv < 2))
mbed_official 174:8bb9f3a33240 169 dlv = 2;
mbed_official 174:8bb9f3a33240 170
mbed_official 174:8bb9f3a33240 171 // integer rearrangement of the baudrate equation (with rounding)
mbed_official 174:8bb9f3a33240 172 b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2;
mbed_official 174:8bb9f3a33240 173
mbed_official 174:8bb9f3a33240 174 // check to see how we went
mbed_official 174:8bb9f3a33240 175 b = abs(b - baudrate);
mbed_official 174:8bb9f3a33240 176 if (b < err_best)
mbed_official 174:8bb9f3a33240 177 {
mbed_official 174:8bb9f3a33240 178 err_best = b;
mbed_official 174:8bb9f3a33240 179
mbed_official 174:8bb9f3a33240 180 DL = dlv;
mbed_official 174:8bb9f3a33240 181 MulVal = mv;
mbed_official 174:8bb9f3a33240 182 DivAddVal = dav;
mbed_official 174:8bb9f3a33240 183
mbed_official 174:8bb9f3a33240 184 if (b == baudrate)
mbed_official 174:8bb9f3a33240 185 {
mbed_official 174:8bb9f3a33240 186 hit = 1;
mbed_official 174:8bb9f3a33240 187 break;
mbed_official 174:8bb9f3a33240 188 }
mbed_official 174:8bb9f3a33240 189 }
mbed_official 174:8bb9f3a33240 190 }
mbed_official 174:8bb9f3a33240 191 }
mbed_official 174:8bb9f3a33240 192 }
mbed_official 174:8bb9f3a33240 193
mbed_official 174:8bb9f3a33240 194 // set LCR[DLAB] to enable writing to divider registers
mbed_official 174:8bb9f3a33240 195 obj->uart->LCR |= (1 << 7);
mbed_official 174:8bb9f3a33240 196
mbed_official 174:8bb9f3a33240 197 // set divider values
mbed_official 174:8bb9f3a33240 198 obj->uart->DLM = (DL >> 8) & 0xFF;
mbed_official 174:8bb9f3a33240 199 obj->uart->DLL = (DL >> 0) & 0xFF;
mbed_official 174:8bb9f3a33240 200 obj->uart->FDR = (uint32_t) DivAddVal << 0
mbed_official 174:8bb9f3a33240 201 | (uint32_t) MulVal << 4;
mbed_official 174:8bb9f3a33240 202
mbed_official 174:8bb9f3a33240 203 // clear LCR[DLAB]
mbed_official 174:8bb9f3a33240 204 obj->uart->LCR &= ~(1 << 7);
mbed_official 174:8bb9f3a33240 205 }
mbed_official 174:8bb9f3a33240 206
mbed_official 174:8bb9f3a33240 207 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
mbed_official 174:8bb9f3a33240 208 // 0: 1 stop bits, 1: 2 stop bits
mbed_official 174:8bb9f3a33240 209 if (stop_bits != 1 && stop_bits != 2) {
mbed_official 174:8bb9f3a33240 210 error("Invalid stop bits specified");
mbed_official 174:8bb9f3a33240 211 }
mbed_official 174:8bb9f3a33240 212 stop_bits -= 1;
mbed_official 174:8bb9f3a33240 213
mbed_official 174:8bb9f3a33240 214 // 0: 5 data bits ... 3: 8 data bits
mbed_official 174:8bb9f3a33240 215 if (data_bits < 5 || data_bits > 8) {
mbed_official 174:8bb9f3a33240 216 error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
mbed_official 174:8bb9f3a33240 217 }
mbed_official 174:8bb9f3a33240 218 data_bits -= 5;
mbed_official 174:8bb9f3a33240 219
mbed_official 174:8bb9f3a33240 220 int parity_enable, parity_select;
mbed_official 174:8bb9f3a33240 221 switch (parity) {
mbed_official 174:8bb9f3a33240 222 case ParityNone: parity_enable = 0; parity_select = 0; break;
mbed_official 174:8bb9f3a33240 223 case ParityOdd : parity_enable = 1; parity_select = 0; break;
mbed_official 174:8bb9f3a33240 224 case ParityEven: parity_enable = 1; parity_select = 1; break;
mbed_official 174:8bb9f3a33240 225 case ParityForced1: parity_enable = 1; parity_select = 2; break;
mbed_official 174:8bb9f3a33240 226 case ParityForced0: parity_enable = 1; parity_select = 3; break;
mbed_official 174:8bb9f3a33240 227 default:
mbed_official 174:8bb9f3a33240 228 error("Invalid serial parity setting");
mbed_official 174:8bb9f3a33240 229 return;
mbed_official 174:8bb9f3a33240 230 }
mbed_official 174:8bb9f3a33240 231
mbed_official 174:8bb9f3a33240 232 obj->uart->LCR = data_bits << 0
mbed_official 174:8bb9f3a33240 233 | stop_bits << 2
mbed_official 174:8bb9f3a33240 234 | parity_enable << 3
mbed_official 174:8bb9f3a33240 235 | parity_select << 4;
mbed_official 174:8bb9f3a33240 236 }
mbed_official 174:8bb9f3a33240 237
mbed_official 174:8bb9f3a33240 238 /******************************************************************************
mbed_official 174:8bb9f3a33240 239 * INTERRUPTS HANDLING
mbed_official 174:8bb9f3a33240 240 ******************************************************************************/
mbed_official 174:8bb9f3a33240 241 static inline void uart_irq(uint32_t iir, uint32_t index) {
mbed_official 174:8bb9f3a33240 242 // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling
mbed_official 174:8bb9f3a33240 243 SerialIrq irq_type;
mbed_official 174:8bb9f3a33240 244 switch (iir) {
mbed_official 174:8bb9f3a33240 245 case 1: irq_type = TxIrq; break;
mbed_official 174:8bb9f3a33240 246 case 2: irq_type = RxIrq; break;
mbed_official 174:8bb9f3a33240 247 default: return;
mbed_official 174:8bb9f3a33240 248 }
mbed_official 174:8bb9f3a33240 249
mbed_official 174:8bb9f3a33240 250 if (serial_irq_ids[index] != 0)
mbed_official 174:8bb9f3a33240 251 irq_handler(serial_irq_ids[index], irq_type);
mbed_official 174:8bb9f3a33240 252 }
mbed_official 174:8bb9f3a33240 253
mbed_official 174:8bb9f3a33240 254 void uart0_irq()
mbed_official 174:8bb9f3a33240 255 {
mbed_official 174:8bb9f3a33240 256 uart_irq((LPC_USART0->IIR >> 1) & 0x7, 0);
mbed_official 174:8bb9f3a33240 257 }
mbed_official 174:8bb9f3a33240 258
mbed_official 174:8bb9f3a33240 259 void uart1_irq()
mbed_official 174:8bb9f3a33240 260 {
mbed_official 174:8bb9f3a33240 261 //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 1);
mbed_official 174:8bb9f3a33240 262 }
mbed_official 174:8bb9f3a33240 263
mbed_official 174:8bb9f3a33240 264 void uart2_irq()
mbed_official 174:8bb9f3a33240 265 {
mbed_official 174:8bb9f3a33240 266 //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 2);
mbed_official 174:8bb9f3a33240 267 }
mbed_official 174:8bb9f3a33240 268
mbed_official 174:8bb9f3a33240 269 void uart3_irq()
mbed_official 174:8bb9f3a33240 270 {
mbed_official 174:8bb9f3a33240 271 //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 3);
mbed_official 174:8bb9f3a33240 272 }
mbed_official 174:8bb9f3a33240 273
mbed_official 174:8bb9f3a33240 274 void uart4_irq()
mbed_official 174:8bb9f3a33240 275 {
mbed_official 174:8bb9f3a33240 276 //uart_irq((LPC_USART4->IIR >> 1) & 0x7, 4);
mbed_official 174:8bb9f3a33240 277 }
mbed_official 174:8bb9f3a33240 278
mbed_official 174:8bb9f3a33240 279 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
mbed_official 174:8bb9f3a33240 280 irq_handler = handler;
mbed_official 174:8bb9f3a33240 281 serial_irq_ids[obj->index] = id;
mbed_official 174:8bb9f3a33240 282 }
mbed_official 174:8bb9f3a33240 283
mbed_official 174:8bb9f3a33240 284 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
mbed_official 174:8bb9f3a33240 285 IRQn_Type irq_n = (IRQn_Type)0;
mbed_official 174:8bb9f3a33240 286 uint32_t vector = 0;
mbed_official 174:8bb9f3a33240 287 switch ((int)obj->uart) {
mbed_official 174:8bb9f3a33240 288 case UART_0: irq_n = USART0_IRQn; vector = (uint32_t)&uart0_irq; break;
mbed_official 174:8bb9f3a33240 289 case UART_1: irq_n = USART1_4_IRQn; vector = (uint32_t)&uart1_irq; break;
mbed_official 174:8bb9f3a33240 290 case UART_2: irq_n = USART2_3_IRQn; vector = (uint32_t)&uart2_irq; break;
mbed_official 174:8bb9f3a33240 291 case UART_3: irq_n = USART2_3_IRQn; vector = (uint32_t)&uart3_irq; break;
mbed_official 174:8bb9f3a33240 292 case UART_4: irq_n = USART1_4_IRQn; vector = (uint32_t)&uart4_irq; break;
mbed_official 174:8bb9f3a33240 293 }
mbed_official 174:8bb9f3a33240 294
mbed_official 174:8bb9f3a33240 295 if (enable) {
mbed_official 174:8bb9f3a33240 296 obj->uart->IER |= (1 << irq);
mbed_official 174:8bb9f3a33240 297 NVIC_SetVector(irq_n, vector);
mbed_official 174:8bb9f3a33240 298 NVIC_EnableIRQ(irq_n);
mbed_official 174:8bb9f3a33240 299 } else { // disable
mbed_official 174:8bb9f3a33240 300 int all_disabled = 0;
mbed_official 174:8bb9f3a33240 301 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
mbed_official 174:8bb9f3a33240 302
mbed_official 174:8bb9f3a33240 303 obj->uart->IER &= ~(1 << irq);
mbed_official 174:8bb9f3a33240 304 all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
mbed_official 174:8bb9f3a33240 305
mbed_official 174:8bb9f3a33240 306 if (all_disabled)
mbed_official 174:8bb9f3a33240 307 NVIC_DisableIRQ(irq_n);
mbed_official 174:8bb9f3a33240 308 }
mbed_official 174:8bb9f3a33240 309 }
mbed_official 174:8bb9f3a33240 310
mbed_official 174:8bb9f3a33240 311 /******************************************************************************
mbed_official 174:8bb9f3a33240 312 * READ/WRITE
mbed_official 174:8bb9f3a33240 313 ******************************************************************************/
mbed_official 174:8bb9f3a33240 314 int serial_getc(serial_t *obj) {
mbed_official 174:8bb9f3a33240 315 while (!serial_readable(obj));
mbed_official 174:8bb9f3a33240 316 return obj->uart->RBR;
mbed_official 174:8bb9f3a33240 317 }
mbed_official 174:8bb9f3a33240 318
mbed_official 174:8bb9f3a33240 319 void serial_putc(serial_t *obj, int c) {
mbed_official 174:8bb9f3a33240 320 while (!serial_writable(obj));
mbed_official 174:8bb9f3a33240 321 obj->uart->THR = c;
mbed_official 174:8bb9f3a33240 322 }
mbed_official 174:8bb9f3a33240 323
mbed_official 174:8bb9f3a33240 324 int serial_readable(serial_t *obj) {
mbed_official 174:8bb9f3a33240 325 return obj->uart->LSR & 0x01;
mbed_official 174:8bb9f3a33240 326 }
mbed_official 174:8bb9f3a33240 327
mbed_official 174:8bb9f3a33240 328 int serial_writable(serial_t *obj) {
mbed_official 174:8bb9f3a33240 329 return obj->uart->LSR & 0x20;
mbed_official 174:8bb9f3a33240 330 }
mbed_official 174:8bb9f3a33240 331
mbed_official 174:8bb9f3a33240 332 void serial_clear(serial_t *obj) {
mbed_official 174:8bb9f3a33240 333 obj->uart->FCR = 1 << 1 // rx FIFO reset
mbed_official 174:8bb9f3a33240 334 | 1 << 2 // tx FIFO reset
mbed_official 174:8bb9f3a33240 335 | 0 << 6; // interrupt depth
mbed_official 174:8bb9f3a33240 336 }
mbed_official 174:8bb9f3a33240 337
mbed_official 174:8bb9f3a33240 338 void serial_pinout_tx(PinName tx) {
mbed_official 174:8bb9f3a33240 339 pinmap_pinout(tx, PinMap_UART_TX);
mbed_official 174:8bb9f3a33240 340 }
mbed_official 174:8bb9f3a33240 341
mbed_official 174:8bb9f3a33240 342 void serial_break_set(serial_t *obj) {
mbed_official 174:8bb9f3a33240 343 obj->uart->LCR |= (1 << 6);
mbed_official 174:8bb9f3a33240 344 }
mbed_official 174:8bb9f3a33240 345
mbed_official 174:8bb9f3a33240 346 void serial_break_clear(serial_t *obj) {
mbed_official 174:8bb9f3a33240 347 obj->uart->LCR &= ~(1 << 6);
mbed_official 174:8bb9f3a33240 348 }
mbed_official 174:8bb9f3a33240 349
mbed_official 174:8bb9f3a33240 350
mbed_official 174:8bb9f3a33240 351 #endif