mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC43XX/serial_api.c@51:7838415c99e7, 2013-12-02 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Dec 02 10:00:04 2013 +0000
- Revision:
- 51:7838415c99e7
- Parent:
- 20:4263a77256ae
- Child:
- 140:ca60b7a31055
Synchronized with git revision 6aaa1345164ad42bf681b857dc768b1b65a07595
Full URL: https://github.com/mbedmicro/mbed/commit/6aaa1345164ad42bf681b857dc768b1b65a07595/
Added (deep)sleep to KL25Z
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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> |
bogdanm | 20:4263a77256ae | 21 | |
bogdanm | 20:4263a77256ae | 22 | #include "serial_api.h" |
bogdanm | 20:4263a77256ae | 23 | #include "cmsis.h" |
bogdanm | 20:4263a77256ae | 24 | #include "pinmap.h" |
bogdanm | 20:4263a77256ae | 25 | #include "error.h" |
bogdanm | 20:4263a77256ae | 26 | |
bogdanm | 20:4263a77256ae | 27 | /****************************************************************************** |
bogdanm | 20:4263a77256ae | 28 | * INITIALIZATION |
bogdanm | 20:4263a77256ae | 29 | ******************************************************************************/ |
bogdanm | 20:4263a77256ae | 30 | static const PinMap PinMap_UART_TX[] = { |
bogdanm | 20:4263a77256ae | 31 | {UART0_TX, UART_0, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 32 | {UART1_TX, UART_1, (SCU_PINIO_PULLDOWN | 4)}, |
bogdanm | 20:4263a77256ae | 33 | {UART2_TX, UART_2, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 34 | {UART3_TX, UART_3, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 35 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 36 | }; |
bogdanm | 20:4263a77256ae | 37 | |
bogdanm | 20:4263a77256ae | 38 | static const PinMap PinMap_UART_RX[] = { |
bogdanm | 20:4263a77256ae | 39 | {UART0_RX, UART_0, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 40 | {UART1_RX, UART_1, (SCU_PINIO_PULLDOWN | 1)}, |
bogdanm | 20:4263a77256ae | 41 | {UART2_RX, UART_2, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 42 | {UART3_RX, UART_3, (SCU_PINIO_PULLDOWN | 2)}, |
bogdanm | 20:4263a77256ae | 43 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 44 | }; |
bogdanm | 20:4263a77256ae | 45 | |
bogdanm | 20:4263a77256ae | 46 | #define UART_NUM 4 |
bogdanm | 20:4263a77256ae | 47 | |
bogdanm | 20:4263a77256ae | 48 | static uint32_t serial_irq_ids[UART_NUM] = {0}; |
bogdanm | 20:4263a77256ae | 49 | static uart_irq_handler irq_handler; |
bogdanm | 20:4263a77256ae | 50 | |
bogdanm | 20:4263a77256ae | 51 | int stdio_uart_inited = 0; |
bogdanm | 20:4263a77256ae | 52 | serial_t stdio_uart; |
bogdanm | 20:4263a77256ae | 53 | |
bogdanm | 20:4263a77256ae | 54 | void serial_init(serial_t *obj, PinName tx, PinName rx) { |
bogdanm | 20:4263a77256ae | 55 | int is_stdio_uart = 0; |
bogdanm | 20:4263a77256ae | 56 | |
bogdanm | 20:4263a77256ae | 57 | // determine the UART to use |
bogdanm | 20:4263a77256ae | 58 | UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX); |
bogdanm | 20:4263a77256ae | 59 | UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX); |
bogdanm | 20:4263a77256ae | 60 | UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx); |
bogdanm | 20:4263a77256ae | 61 | if ((int)uart == NC) { |
bogdanm | 20:4263a77256ae | 62 | error("Serial pinout mapping failed"); |
bogdanm | 20:4263a77256ae | 63 | } |
bogdanm | 20:4263a77256ae | 64 | |
bogdanm | 20:4263a77256ae | 65 | obj->uart = (LPC_USART_T *)uart; |
bogdanm | 20:4263a77256ae | 66 | |
bogdanm | 20:4263a77256ae | 67 | // enable fifos and default rx trigger level |
bogdanm | 20:4263a77256ae | 68 | obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled |
bogdanm | 20:4263a77256ae | 69 | | 0 << 1 // Rx Fifo Reset |
bogdanm | 20:4263a77256ae | 70 | | 0 << 2 // Tx Fifo Reset |
bogdanm | 20:4263a77256ae | 71 | | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars |
bogdanm | 20:4263a77256ae | 72 | |
bogdanm | 20:4263a77256ae | 73 | // disable irqs |
bogdanm | 20:4263a77256ae | 74 | obj->uart->IER = 0 << 0 // Rx Data available irq enable |
bogdanm | 20:4263a77256ae | 75 | | 0 << 1 // Tx Fifo empty irq enable |
bogdanm | 20:4263a77256ae | 76 | | 0 << 2; // Rx Line Status irq enable |
bogdanm | 20:4263a77256ae | 77 | |
bogdanm | 20:4263a77256ae | 78 | // set default baud rate and format |
bogdanm | 20:4263a77256ae | 79 | serial_baud (obj, 9600); |
bogdanm | 20:4263a77256ae | 80 | serial_format(obj, 8, ParityNone, 1); |
bogdanm | 20:4263a77256ae | 81 | |
bogdanm | 20:4263a77256ae | 82 | // pinout the chosen uart |
bogdanm | 20:4263a77256ae | 83 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 20:4263a77256ae | 84 | pinmap_pinout(rx, PinMap_UART_RX); |
bogdanm | 20:4263a77256ae | 85 | |
bogdanm | 20:4263a77256ae | 86 | // set rx/tx pins in PullUp mode |
bogdanm | 20:4263a77256ae | 87 | pin_mode(tx, PullUp); |
bogdanm | 20:4263a77256ae | 88 | pin_mode(rx, PullUp); |
bogdanm | 20:4263a77256ae | 89 | |
bogdanm | 20:4263a77256ae | 90 | switch (uart) { |
bogdanm | 20:4263a77256ae | 91 | case UART_0: obj->index = 0; break; |
bogdanm | 20:4263a77256ae | 92 | case UART_1: obj->index = 1; break; |
bogdanm | 20:4263a77256ae | 93 | case UART_2: obj->index = 2; break; |
bogdanm | 20:4263a77256ae | 94 | #if (UART_NUM > 3) |
bogdanm | 20:4263a77256ae | 95 | case UART_3: obj->index = 3; break; |
bogdanm | 20:4263a77256ae | 96 | #endif |
bogdanm | 20:4263a77256ae | 97 | #if (UART_NUM > 4) |
bogdanm | 20:4263a77256ae | 98 | case UART_4: obj->index = 4; break; |
bogdanm | 20:4263a77256ae | 99 | #endif |
bogdanm | 20:4263a77256ae | 100 | } |
bogdanm | 20:4263a77256ae | 101 | |
bogdanm | 20:4263a77256ae | 102 | is_stdio_uart = (uart == STDIO_UART) ? (1) : (0); |
bogdanm | 20:4263a77256ae | 103 | |
bogdanm | 20:4263a77256ae | 104 | if (is_stdio_uart) { |
bogdanm | 20:4263a77256ae | 105 | stdio_uart_inited = 1; |
bogdanm | 20:4263a77256ae | 106 | memcpy(&stdio_uart, obj, sizeof(serial_t)); |
bogdanm | 20:4263a77256ae | 107 | } |
bogdanm | 20:4263a77256ae | 108 | } |
bogdanm | 20:4263a77256ae | 109 | |
bogdanm | 20:4263a77256ae | 110 | void serial_free(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 111 | serial_irq_ids[obj->index] = 0; |
bogdanm | 20:4263a77256ae | 112 | } |
bogdanm | 20:4263a77256ae | 113 | |
bogdanm | 20:4263a77256ae | 114 | // serial_baud |
bogdanm | 20:4263a77256ae | 115 | // set the baud rate, taking in to account the current SystemFrequency |
bogdanm | 20:4263a77256ae | 116 | void serial_baud(serial_t *obj, int baudrate) { |
bogdanm | 20:4263a77256ae | 117 | uint32_t PCLK = SystemCoreClock; |
bogdanm | 20:4263a77256ae | 118 | |
bogdanm | 20:4263a77256ae | 119 | // First we check to see if the basic divide with no DivAddVal/MulVal |
bogdanm | 20:4263a77256ae | 120 | // ratio gives us an integer result. If it does, we set DivAddVal = 0, |
bogdanm | 20:4263a77256ae | 121 | // MulVal = 1. Otherwise, we search the valid ratio value range to find |
bogdanm | 20:4263a77256ae | 122 | // the closest match. This could be more elegant, using search methods |
bogdanm | 20:4263a77256ae | 123 | // and/or lookup tables, but the brute force method is not that much |
bogdanm | 20:4263a77256ae | 124 | // slower, and is more maintainable. |
bogdanm | 20:4263a77256ae | 125 | uint16_t DL = PCLK / (16 * baudrate); |
bogdanm | 20:4263a77256ae | 126 | |
bogdanm | 20:4263a77256ae | 127 | uint8_t DivAddVal = 0; |
bogdanm | 20:4263a77256ae | 128 | uint8_t MulVal = 1; |
bogdanm | 20:4263a77256ae | 129 | int hit = 0; |
bogdanm | 20:4263a77256ae | 130 | uint16_t dlv; |
bogdanm | 20:4263a77256ae | 131 | uint8_t mv, dav; |
bogdanm | 20:4263a77256ae | 132 | if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder |
mbed_official | 51:7838415c99e7 | 133 | int err_best = baudrate, b; |
mbed_official | 51:7838415c99e7 | 134 | for (mv = 1; mv < 16 && !hit; mv++) |
mbed_official | 51:7838415c99e7 | 135 | { |
mbed_official | 51:7838415c99e7 | 136 | for (dav = 0; dav < mv; dav++) |
mbed_official | 51:7838415c99e7 | 137 | { |
mbed_official | 51:7838415c99e7 | 138 | // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul)) |
mbed_official | 51:7838415c99e7 | 139 | // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul)) |
mbed_official | 51:7838415c99e7 | 140 | // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding |
mbed_official | 51:7838415c99e7 | 141 | // 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 | 142 | // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding |
mbed_official | 51:7838415c99e7 | 143 | |
mbed_official | 51:7838415c99e7 | 144 | if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom |
mbed_official | 51:7838415c99e7 | 145 | dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 146 | else // 2 bits headroom, use more precision |
mbed_official | 51:7838415c99e7 | 147 | dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 148 | |
mbed_official | 51:7838415c99e7 | 149 | // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood |
mbed_official | 51:7838415c99e7 | 150 | if (dlv == 0) |
mbed_official | 51:7838415c99e7 | 151 | dlv = 1; |
mbed_official | 51:7838415c99e7 | 152 | |
mbed_official | 51:7838415c99e7 | 153 | // datasheet says if dav > 0 then DL must be >= 2 |
mbed_official | 51:7838415c99e7 | 154 | if ((dav > 0) && (dlv < 2)) |
mbed_official | 51:7838415c99e7 | 155 | dlv = 2; |
mbed_official | 51:7838415c99e7 | 156 | |
mbed_official | 51:7838415c99e7 | 157 | // integer rearrangement of the baudrate equation (with rounding) |
mbed_official | 51:7838415c99e7 | 158 | b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 159 | |
mbed_official | 51:7838415c99e7 | 160 | // check to see how we went |
mbed_official | 51:7838415c99e7 | 161 | b = abs(b - baudrate); |
mbed_official | 51:7838415c99e7 | 162 | if (b < err_best) |
mbed_official | 51:7838415c99e7 | 163 | { |
mbed_official | 51:7838415c99e7 | 164 | err_best = b; |
mbed_official | 51:7838415c99e7 | 165 | |
mbed_official | 51:7838415c99e7 | 166 | DL = dlv; |
mbed_official | 51:7838415c99e7 | 167 | MulVal = mv; |
mbed_official | 51:7838415c99e7 | 168 | DivAddVal = dav; |
mbed_official | 51:7838415c99e7 | 169 | |
mbed_official | 51:7838415c99e7 | 170 | if (b == baudrate) |
mbed_official | 51:7838415c99e7 | 171 | { |
mbed_official | 51:7838415c99e7 | 172 | hit = 1; |
mbed_official | 51:7838415c99e7 | 173 | break; |
bogdanm | 20:4263a77256ae | 174 | } |
bogdanm | 20:4263a77256ae | 175 | } |
bogdanm | 20:4263a77256ae | 176 | } |
bogdanm | 20:4263a77256ae | 177 | } |
bogdanm | 20:4263a77256ae | 178 | } |
bogdanm | 20:4263a77256ae | 179 | |
bogdanm | 20:4263a77256ae | 180 | // set LCR[DLAB] to enable writing to divider registers |
bogdanm | 20:4263a77256ae | 181 | obj->uart->LCR |= (1 << 7); |
bogdanm | 20:4263a77256ae | 182 | |
bogdanm | 20:4263a77256ae | 183 | // set divider values |
bogdanm | 20:4263a77256ae | 184 | obj->uart->DLM = (DL >> 8) & 0xFF; |
bogdanm | 20:4263a77256ae | 185 | obj->uart->DLL = (DL >> 0) & 0xFF; |
bogdanm | 20:4263a77256ae | 186 | obj->uart->FDR = (uint32_t) DivAddVal << 0 |
bogdanm | 20:4263a77256ae | 187 | | (uint32_t) MulVal << 4; |
bogdanm | 20:4263a77256ae | 188 | |
bogdanm | 20:4263a77256ae | 189 | // clear LCR[DLAB] |
bogdanm | 20:4263a77256ae | 190 | obj->uart->LCR &= ~(1 << 7); |
bogdanm | 20:4263a77256ae | 191 | } |
bogdanm | 20:4263a77256ae | 192 | |
bogdanm | 20:4263a77256ae | 193 | void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { |
bogdanm | 20:4263a77256ae | 194 | // 0: 1 stop bits, 1: 2 stop bits |
bogdanm | 20:4263a77256ae | 195 | if (stop_bits != 1 && stop_bits != 2) { |
bogdanm | 20:4263a77256ae | 196 | error("Invalid stop bits specified"); |
bogdanm | 20:4263a77256ae | 197 | } |
bogdanm | 20:4263a77256ae | 198 | stop_bits -= 1; |
bogdanm | 20:4263a77256ae | 199 | |
bogdanm | 20:4263a77256ae | 200 | // 0: 5 data bits ... 3: 8 data bits |
bogdanm | 20:4263a77256ae | 201 | if (data_bits < 5 || data_bits > 8) { |
bogdanm | 20:4263a77256ae | 202 | error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits); |
bogdanm | 20:4263a77256ae | 203 | } |
bogdanm | 20:4263a77256ae | 204 | data_bits -= 5; |
bogdanm | 20:4263a77256ae | 205 | |
bogdanm | 20:4263a77256ae | 206 | int parity_enable, parity_select; |
bogdanm | 20:4263a77256ae | 207 | switch (parity) { |
bogdanm | 20:4263a77256ae | 208 | case ParityNone: parity_enable = 0; parity_select = 0; break; |
bogdanm | 20:4263a77256ae | 209 | case ParityOdd : parity_enable = 1; parity_select = 0; break; |
bogdanm | 20:4263a77256ae | 210 | case ParityEven: parity_enable = 1; parity_select = 1; break; |
bogdanm | 20:4263a77256ae | 211 | case ParityForced1: parity_enable = 1; parity_select = 2; break; |
bogdanm | 20:4263a77256ae | 212 | case ParityForced0: parity_enable = 1; parity_select = 3; break; |
bogdanm | 20:4263a77256ae | 213 | default: |
bogdanm | 20:4263a77256ae | 214 | error("Invalid serial parity setting"); |
bogdanm | 20:4263a77256ae | 215 | return; |
bogdanm | 20:4263a77256ae | 216 | } |
bogdanm | 20:4263a77256ae | 217 | |
bogdanm | 20:4263a77256ae | 218 | obj->uart->LCR = data_bits << 0 |
bogdanm | 20:4263a77256ae | 219 | | stop_bits << 2 |
bogdanm | 20:4263a77256ae | 220 | | parity_enable << 3 |
bogdanm | 20:4263a77256ae | 221 | | parity_select << 4; |
bogdanm | 20:4263a77256ae | 222 | } |
bogdanm | 20:4263a77256ae | 223 | |
bogdanm | 20:4263a77256ae | 224 | /****************************************************************************** |
bogdanm | 20:4263a77256ae | 225 | * INTERRUPTS HANDLING |
bogdanm | 20:4263a77256ae | 226 | ******************************************************************************/ |
bogdanm | 20:4263a77256ae | 227 | static inline void uart_irq(uint32_t iir, uint32_t index) { |
bogdanm | 20:4263a77256ae | 228 | // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling |
bogdanm | 20:4263a77256ae | 229 | SerialIrq irq_type; |
bogdanm | 20:4263a77256ae | 230 | switch (iir) { |
bogdanm | 20:4263a77256ae | 231 | case 1: irq_type = TxIrq; break; |
bogdanm | 20:4263a77256ae | 232 | case 2: irq_type = RxIrq; break; |
bogdanm | 20:4263a77256ae | 233 | default: return; |
bogdanm | 20:4263a77256ae | 234 | } |
bogdanm | 20:4263a77256ae | 235 | |
bogdanm | 20:4263a77256ae | 236 | if (serial_irq_ids[index] != 0) |
bogdanm | 20:4263a77256ae | 237 | irq_handler(serial_irq_ids[index], irq_type); |
bogdanm | 20:4263a77256ae | 238 | } |
bogdanm | 20:4263a77256ae | 239 | |
bogdanm | 20:4263a77256ae | 240 | void uart0_irq() {uart_irq((LPC_USART0->IIR >> 1) & 0x7, 0);} |
bogdanm | 20:4263a77256ae | 241 | void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1);} |
bogdanm | 20:4263a77256ae | 242 | void uart2_irq() {uart_irq((LPC_USART2->IIR >> 1) & 0x7, 2);} |
bogdanm | 20:4263a77256ae | 243 | void uart3_irq() {uart_irq((LPC_USART3->IIR >> 1) & 0x7, 3);} |
bogdanm | 20:4263a77256ae | 244 | |
bogdanm | 20:4263a77256ae | 245 | void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) { |
bogdanm | 20:4263a77256ae | 246 | irq_handler = handler; |
bogdanm | 20:4263a77256ae | 247 | serial_irq_ids[obj->index] = id; |
bogdanm | 20:4263a77256ae | 248 | } |
bogdanm | 20:4263a77256ae | 249 | |
bogdanm | 20:4263a77256ae | 250 | void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) { |
bogdanm | 20:4263a77256ae | 251 | IRQn_Type irq_n = (IRQn_Type)0; |
bogdanm | 20:4263a77256ae | 252 | uint32_t vector = 0; |
bogdanm | 20:4263a77256ae | 253 | switch ((int)obj->uart) { |
bogdanm | 20:4263a77256ae | 254 | case UART_0: irq_n=USART0_IRQn; vector = (uint32_t)&uart0_irq; break; |
bogdanm | 20:4263a77256ae | 255 | case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break; |
bogdanm | 20:4263a77256ae | 256 | case UART_2: irq_n=USART2_IRQn; vector = (uint32_t)&uart2_irq; break; |
bogdanm | 20:4263a77256ae | 257 | case UART_3: irq_n=USART3_IRQn; vector = (uint32_t)&uart3_irq; break; |
bogdanm | 20:4263a77256ae | 258 | } |
bogdanm | 20:4263a77256ae | 259 | |
bogdanm | 20:4263a77256ae | 260 | if (enable) { |
bogdanm | 20:4263a77256ae | 261 | obj->uart->IER |= 1 << irq; |
bogdanm | 20:4263a77256ae | 262 | NVIC_SetVector(irq_n, vector); |
bogdanm | 20:4263a77256ae | 263 | NVIC_EnableIRQ(irq_n); |
bogdanm | 20:4263a77256ae | 264 | } else { // disable |
bogdanm | 20:4263a77256ae | 265 | int all_disabled = 0; |
bogdanm | 20:4263a77256ae | 266 | SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq); |
bogdanm | 20:4263a77256ae | 267 | obj->uart->IER &= ~(1 << irq); |
bogdanm | 20:4263a77256ae | 268 | all_disabled = (obj->uart->IER & (1 << other_irq)) == 0; |
bogdanm | 20:4263a77256ae | 269 | if (all_disabled) |
bogdanm | 20:4263a77256ae | 270 | NVIC_DisableIRQ(irq_n); |
bogdanm | 20:4263a77256ae | 271 | } |
bogdanm | 20:4263a77256ae | 272 | } |
bogdanm | 20:4263a77256ae | 273 | |
bogdanm | 20:4263a77256ae | 274 | /****************************************************************************** |
bogdanm | 20:4263a77256ae | 275 | * READ/WRITE |
bogdanm | 20:4263a77256ae | 276 | ******************************************************************************/ |
bogdanm | 20:4263a77256ae | 277 | int serial_getc(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 278 | while (!serial_readable(obj)); |
bogdanm | 20:4263a77256ae | 279 | return obj->uart->RBR; |
bogdanm | 20:4263a77256ae | 280 | } |
bogdanm | 20:4263a77256ae | 281 | |
bogdanm | 20:4263a77256ae | 282 | void serial_putc(serial_t *obj, int c) { |
bogdanm | 20:4263a77256ae | 283 | while (!serial_writable(obj)); |
bogdanm | 20:4263a77256ae | 284 | obj->uart->THR = c; |
bogdanm | 20:4263a77256ae | 285 | } |
bogdanm | 20:4263a77256ae | 286 | |
bogdanm | 20:4263a77256ae | 287 | int serial_readable(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 288 | return obj->uart->LSR & 0x01; |
bogdanm | 20:4263a77256ae | 289 | } |
bogdanm | 20:4263a77256ae | 290 | |
bogdanm | 20:4263a77256ae | 291 | int serial_writable(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 292 | return obj->uart->LSR & 0x20; |
bogdanm | 20:4263a77256ae | 293 | } |
bogdanm | 20:4263a77256ae | 294 | |
bogdanm | 20:4263a77256ae | 295 | void serial_clear(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 296 | obj->uart->FCR = 1 << 1 // rx FIFO reset |
bogdanm | 20:4263a77256ae | 297 | | 1 << 2 // tx FIFO reset |
bogdanm | 20:4263a77256ae | 298 | | 0 << 6; // interrupt depth |
bogdanm | 20:4263a77256ae | 299 | } |
bogdanm | 20:4263a77256ae | 300 | |
bogdanm | 20:4263a77256ae | 301 | void serial_pinout_tx(PinName tx) { |
bogdanm | 20:4263a77256ae | 302 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 20:4263a77256ae | 303 | } |
bogdanm | 20:4263a77256ae | 304 | |
bogdanm | 20:4263a77256ae | 305 | void serial_break_set(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 306 | obj->uart->LCR |= (1 << 6); |
bogdanm | 20:4263a77256ae | 307 | } |
bogdanm | 20:4263a77256ae | 308 | |
bogdanm | 20:4263a77256ae | 309 | void serial_break_clear(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 310 | obj->uart->LCR &= ~(1 << 6); |
bogdanm | 20:4263a77256ae | 311 | } |
bogdanm | 20:4263a77256ae | 312 |