mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC23XX/serial_api.c@13:0645d8841f51, 2013-08-05 (annotated)
- Committer:
- bogdanm
- Date:
- Mon Aug 05 14:12:34 2013 +0300
- Revision:
- 13:0645d8841f51
- Child:
- 20:4263a77256ae
Update mbed sources to revision 64
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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bogdanm | 13:0645d8841f51 | 1 | /* mbed Microcontroller Library |
bogdanm | 13:0645d8841f51 | 2 | * Copyright (c) 2006-2013 ARM Limited |
bogdanm | 13:0645d8841f51 | 3 | * |
bogdanm | 13:0645d8841f51 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
bogdanm | 13:0645d8841f51 | 5 | * you may not use this file except in compliance with the License. |
bogdanm | 13:0645d8841f51 | 6 | * You may obtain a copy of the License at |
bogdanm | 13:0645d8841f51 | 7 | * |
bogdanm | 13:0645d8841f51 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
bogdanm | 13:0645d8841f51 | 9 | * |
bogdanm | 13:0645d8841f51 | 10 | * Unless required by applicable law or agreed to in writing, software |
bogdanm | 13:0645d8841f51 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
bogdanm | 13:0645d8841f51 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
bogdanm | 13:0645d8841f51 | 13 | * See the License for the specific language governing permissions and |
bogdanm | 13:0645d8841f51 | 14 | * limitations under the License. |
bogdanm | 13:0645d8841f51 | 15 | */ |
bogdanm | 13:0645d8841f51 | 16 | // math.h required for floating point operations for baud rate calculation |
bogdanm | 13:0645d8841f51 | 17 | #include <math.h> |
bogdanm | 13:0645d8841f51 | 18 | #include <string.h> |
bogdanm | 13:0645d8841f51 | 19 | |
bogdanm | 13:0645d8841f51 | 20 | #include "serial_api.h" |
bogdanm | 13:0645d8841f51 | 21 | #include "cmsis.h" |
bogdanm | 13:0645d8841f51 | 22 | #include "pinmap.h" |
bogdanm | 13:0645d8841f51 | 23 | #include "error.h" |
bogdanm | 13:0645d8841f51 | 24 | |
bogdanm | 13:0645d8841f51 | 25 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 26 | * INITIALIZATION |
bogdanm | 13:0645d8841f51 | 27 | ******************************************************************************/ |
bogdanm | 13:0645d8841f51 | 28 | #define UART_NUM 4 |
bogdanm | 13:0645d8841f51 | 29 | |
bogdanm | 13:0645d8841f51 | 30 | static const PinMap PinMap_UART_TX[] = { |
bogdanm | 13:0645d8841f51 | 31 | {P0_0, UART_3, 2}, |
bogdanm | 13:0645d8841f51 | 32 | {P0_2, UART_0, 1}, |
bogdanm | 13:0645d8841f51 | 33 | {P0_10, UART_2, 1}, |
bogdanm | 13:0645d8841f51 | 34 | {P0_15, UART_1, 1}, |
bogdanm | 13:0645d8841f51 | 35 | {P0_25, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 36 | {P2_0 , UART_1, 2}, |
bogdanm | 13:0645d8841f51 | 37 | {P2_8 , UART_2, 2}, |
bogdanm | 13:0645d8841f51 | 38 | {P4_28, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 39 | {NC , NC , 0} |
bogdanm | 13:0645d8841f51 | 40 | }; |
bogdanm | 13:0645d8841f51 | 41 | |
bogdanm | 13:0645d8841f51 | 42 | static const PinMap PinMap_UART_RX[] = { |
bogdanm | 13:0645d8841f51 | 43 | {P0_1 , UART_3, 2}, |
bogdanm | 13:0645d8841f51 | 44 | {P0_3 , UART_0, 1}, |
bogdanm | 13:0645d8841f51 | 45 | {P0_11, UART_2, 1}, |
bogdanm | 13:0645d8841f51 | 46 | {P0_16, UART_1, 1}, |
bogdanm | 13:0645d8841f51 | 47 | {P0_26, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 48 | {P2_1 , UART_1, 2}, |
bogdanm | 13:0645d8841f51 | 49 | {P2_9 , UART_2, 2}, |
bogdanm | 13:0645d8841f51 | 50 | {P4_29, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 51 | {NC , NC , 0} |
bogdanm | 13:0645d8841f51 | 52 | }; |
bogdanm | 13:0645d8841f51 | 53 | |
bogdanm | 13:0645d8841f51 | 54 | static uint32_t serial_irq_ids[UART_NUM] = {0}; |
bogdanm | 13:0645d8841f51 | 55 | static uart_irq_handler irq_handler; |
bogdanm | 13:0645d8841f51 | 56 | |
bogdanm | 13:0645d8841f51 | 57 | int stdio_uart_inited = 0; |
bogdanm | 13:0645d8841f51 | 58 | serial_t stdio_uart; |
bogdanm | 13:0645d8841f51 | 59 | |
bogdanm | 13:0645d8841f51 | 60 | void serial_init(serial_t *obj, PinName tx, PinName rx) { |
bogdanm | 13:0645d8841f51 | 61 | int is_stdio_uart = 0; |
bogdanm | 13:0645d8841f51 | 62 | |
bogdanm | 13:0645d8841f51 | 63 | // determine the UART to use |
bogdanm | 13:0645d8841f51 | 64 | UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 65 | UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX); |
bogdanm | 13:0645d8841f51 | 66 | UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx); |
bogdanm | 13:0645d8841f51 | 67 | if ((int)uart == NC) { |
bogdanm | 13:0645d8841f51 | 68 | error("Serial pinout mapping failed"); |
bogdanm | 13:0645d8841f51 | 69 | } |
bogdanm | 13:0645d8841f51 | 70 | |
bogdanm | 13:0645d8841f51 | 71 | obj->uart = (LPC_UART_TypeDef *)uart; |
bogdanm | 13:0645d8841f51 | 72 | // enable power |
bogdanm | 13:0645d8841f51 | 73 | switch (uart) { |
bogdanm | 13:0645d8841f51 | 74 | case UART_0: LPC_SC->PCONP |= 1 << 3; break; |
bogdanm | 13:0645d8841f51 | 75 | case UART_1: LPC_SC->PCONP |= 1 << 4; break; |
bogdanm | 13:0645d8841f51 | 76 | case UART_2: LPC_SC->PCONP |= 1 << 24; break; |
bogdanm | 13:0645d8841f51 | 77 | case UART_3: LPC_SC->PCONP |= 1 << 25; break; |
bogdanm | 13:0645d8841f51 | 78 | } |
bogdanm | 13:0645d8841f51 | 79 | |
bogdanm | 13:0645d8841f51 | 80 | // enable fifos and default rx trigger level |
bogdanm | 13:0645d8841f51 | 81 | obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled |
bogdanm | 13:0645d8841f51 | 82 | | 0 << 1 // Rx Fifo Reset |
bogdanm | 13:0645d8841f51 | 83 | | 0 << 2 // Tx Fifo Reset |
bogdanm | 13:0645d8841f51 | 84 | | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars |
bogdanm | 13:0645d8841f51 | 85 | |
bogdanm | 13:0645d8841f51 | 86 | // disable irqs |
bogdanm | 13:0645d8841f51 | 87 | obj->uart->IER = 0 << 0 // Rx Data available irq enable |
bogdanm | 13:0645d8841f51 | 88 | | 0 << 1 // Tx Fifo empty irq enable |
bogdanm | 13:0645d8841f51 | 89 | | 0 << 2; // Rx Line Status irq enable |
bogdanm | 13:0645d8841f51 | 90 | |
bogdanm | 13:0645d8841f51 | 91 | // set default baud rate and format |
bogdanm | 13:0645d8841f51 | 92 | serial_baud (obj, 9600); |
bogdanm | 13:0645d8841f51 | 93 | serial_format(obj, 8, ParityNone, 1); |
bogdanm | 13:0645d8841f51 | 94 | |
bogdanm | 13:0645d8841f51 | 95 | // pinout the chosen uart |
bogdanm | 13:0645d8841f51 | 96 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 97 | pinmap_pinout(rx, PinMap_UART_RX); |
bogdanm | 13:0645d8841f51 | 98 | |
bogdanm | 13:0645d8841f51 | 99 | // set rx/tx pins in PullUp mode |
bogdanm | 13:0645d8841f51 | 100 | pin_mode(tx, PullUp); |
bogdanm | 13:0645d8841f51 | 101 | pin_mode(rx, PullUp); |
bogdanm | 13:0645d8841f51 | 102 | |
bogdanm | 13:0645d8841f51 | 103 | switch (uart) { |
bogdanm | 13:0645d8841f51 | 104 | case UART_0: obj->index = 0; break; |
bogdanm | 13:0645d8841f51 | 105 | case UART_1: obj->index = 1; break; |
bogdanm | 13:0645d8841f51 | 106 | case UART_2: obj->index = 2; break; |
bogdanm | 13:0645d8841f51 | 107 | case UART_3: obj->index = 3; break; |
bogdanm | 13:0645d8841f51 | 108 | } |
bogdanm | 13:0645d8841f51 | 109 | |
bogdanm | 13:0645d8841f51 | 110 | is_stdio_uart = (uart == STDIO_UART) ? (1) : (0); |
bogdanm | 13:0645d8841f51 | 111 | |
bogdanm | 13:0645d8841f51 | 112 | if (is_stdio_uart) { |
bogdanm | 13:0645d8841f51 | 113 | stdio_uart_inited = 1; |
bogdanm | 13:0645d8841f51 | 114 | memcpy(&stdio_uart, obj, sizeof(serial_t)); |
bogdanm | 13:0645d8841f51 | 115 | } |
bogdanm | 13:0645d8841f51 | 116 | } |
bogdanm | 13:0645d8841f51 | 117 | |
bogdanm | 13:0645d8841f51 | 118 | void serial_free(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 119 | serial_irq_ids[obj->index] = 0; |
bogdanm | 13:0645d8841f51 | 120 | } |
bogdanm | 13:0645d8841f51 | 121 | |
bogdanm | 13:0645d8841f51 | 122 | // serial_baud |
bogdanm | 13:0645d8841f51 | 123 | // set the baud rate, taking in to account the current SystemFrequency |
bogdanm | 13:0645d8841f51 | 124 | void serial_baud(serial_t *obj, int baudrate) { |
bogdanm | 13:0645d8841f51 | 125 | // The LPC2300 and LPC1700 have a divider and a fractional divider to control the |
bogdanm | 13:0645d8841f51 | 126 | // baud rate. The formula is: |
bogdanm | 13:0645d8841f51 | 127 | // |
bogdanm | 13:0645d8841f51 | 128 | // Baudrate = (1 / PCLK) * 16 * DL * (1 + DivAddVal / MulVal) |
bogdanm | 13:0645d8841f51 | 129 | // where: |
bogdanm | 13:0645d8841f51 | 130 | // 1 < MulVal <= 15 |
bogdanm | 13:0645d8841f51 | 131 | // 0 <= DivAddVal < 14 |
bogdanm | 13:0645d8841f51 | 132 | // DivAddVal < MulVal |
bogdanm | 13:0645d8841f51 | 133 | // |
bogdanm | 13:0645d8841f51 | 134 | // set pclk to /1 |
bogdanm | 13:0645d8841f51 | 135 | switch ((int)obj->uart) { |
bogdanm | 13:0645d8841f51 | 136 | case UART_0: LPC_SC->PCLKSEL0 &= ~(0x3 << 6); LPC_SC->PCLKSEL0 |= (0x1 << 6); break; |
bogdanm | 13:0645d8841f51 | 137 | case UART_1: LPC_SC->PCLKSEL0 &= ~(0x3 << 8); LPC_SC->PCLKSEL0 |= (0x1 << 8); break; |
bogdanm | 13:0645d8841f51 | 138 | case UART_2: LPC_SC->PCLKSEL1 &= ~(0x3 << 16); LPC_SC->PCLKSEL1 |= (0x1 << 16); break; |
bogdanm | 13:0645d8841f51 | 139 | case UART_3: LPC_SC->PCLKSEL1 &= ~(0x3 << 18); LPC_SC->PCLKSEL1 |= (0x1 << 18); break; |
bogdanm | 13:0645d8841f51 | 140 | default: error("serial_baud"); break; |
bogdanm | 13:0645d8841f51 | 141 | } |
bogdanm | 13:0645d8841f51 | 142 | |
bogdanm | 13:0645d8841f51 | 143 | uint32_t PCLK = SystemCoreClock; |
bogdanm | 13:0645d8841f51 | 144 | |
bogdanm | 13:0645d8841f51 | 145 | // First we check to see if the basic divide with no DivAddVal/MulVal |
bogdanm | 13:0645d8841f51 | 146 | // ratio gives us an integer result. If it does, we set DivAddVal = 0, |
bogdanm | 13:0645d8841f51 | 147 | // MulVal = 1. Otherwise, we search the valid ratio value range to find |
bogdanm | 13:0645d8841f51 | 148 | // the closest match. This could be more elegant, using search methods |
bogdanm | 13:0645d8841f51 | 149 | // and/or lookup tables, but the brute force method is not that much |
bogdanm | 13:0645d8841f51 | 150 | // slower, and is more maintainable. |
bogdanm | 13:0645d8841f51 | 151 | uint16_t DL = PCLK / (16 * baudrate); |
bogdanm | 13:0645d8841f51 | 152 | |
bogdanm | 13:0645d8841f51 | 153 | uint8_t DivAddVal = 0; |
bogdanm | 13:0645d8841f51 | 154 | uint8_t MulVal = 1; |
bogdanm | 13:0645d8841f51 | 155 | int hit = 0; |
bogdanm | 13:0645d8841f51 | 156 | uint16_t dlv; |
bogdanm | 13:0645d8841f51 | 157 | uint8_t mv, dav; |
bogdanm | 13:0645d8841f51 | 158 | if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder |
bogdanm | 13:0645d8841f51 | 159 | float err_best = (float) baudrate; |
bogdanm | 13:0645d8841f51 | 160 | uint16_t dlmax = DL; |
bogdanm | 13:0645d8841f51 | 161 | for ( dlv = (dlmax/2); (dlv <= dlmax) && !hit; dlv++) { |
bogdanm | 13:0645d8841f51 | 162 | for ( mv = 1; mv <= 15; mv++) { |
bogdanm | 13:0645d8841f51 | 163 | for ( dav = 1; dav < mv; dav++) { |
bogdanm | 13:0645d8841f51 | 164 | float ratio = 1.0f + ((float) dav / (float) mv); |
bogdanm | 13:0645d8841f51 | 165 | float calcbaud = (float)PCLK / (16.0f * (float) dlv * ratio); |
bogdanm | 13:0645d8841f51 | 166 | float err = fabs(((float) baudrate - calcbaud) / (float) baudrate); |
bogdanm | 13:0645d8841f51 | 167 | if (err < err_best) { |
bogdanm | 13:0645d8841f51 | 168 | DL = dlv; |
bogdanm | 13:0645d8841f51 | 169 | DivAddVal = dav; |
bogdanm | 13:0645d8841f51 | 170 | MulVal = mv; |
bogdanm | 13:0645d8841f51 | 171 | err_best = err; |
bogdanm | 13:0645d8841f51 | 172 | if (err < 0.001f) { |
bogdanm | 13:0645d8841f51 | 173 | hit = 1; |
bogdanm | 13:0645d8841f51 | 174 | } |
bogdanm | 13:0645d8841f51 | 175 | } |
bogdanm | 13:0645d8841f51 | 176 | } |
bogdanm | 13:0645d8841f51 | 177 | } |
bogdanm | 13:0645d8841f51 | 178 | } |
bogdanm | 13:0645d8841f51 | 179 | } |
bogdanm | 13:0645d8841f51 | 180 | |
bogdanm | 13:0645d8841f51 | 181 | // set LCR[DLAB] to enable writing to divider registers |
bogdanm | 13:0645d8841f51 | 182 | obj->uart->LCR |= (1 << 7); |
bogdanm | 13:0645d8841f51 | 183 | |
bogdanm | 13:0645d8841f51 | 184 | // set divider values |
bogdanm | 13:0645d8841f51 | 185 | obj->uart->DLM = (DL >> 8) & 0xFF; |
bogdanm | 13:0645d8841f51 | 186 | obj->uart->DLL = (DL >> 0) & 0xFF; |
bogdanm | 13:0645d8841f51 | 187 | obj->uart->FDR = (uint32_t) DivAddVal << 0 |
bogdanm | 13:0645d8841f51 | 188 | | (uint32_t) MulVal << 4; |
bogdanm | 13:0645d8841f51 | 189 | |
bogdanm | 13:0645d8841f51 | 190 | // clear LCR[DLAB] |
bogdanm | 13:0645d8841f51 | 191 | obj->uart->LCR &= ~(1 << 7); |
bogdanm | 13:0645d8841f51 | 192 | } |
bogdanm | 13:0645d8841f51 | 193 | |
bogdanm | 13:0645d8841f51 | 194 | void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { |
bogdanm | 13:0645d8841f51 | 195 | // 0: 1 stop bits, 1: 2 stop bits |
bogdanm | 13:0645d8841f51 | 196 | if (stop_bits != 1 && stop_bits != 2) { |
bogdanm | 13:0645d8841f51 | 197 | error("Invalid stop bits specified"); |
bogdanm | 13:0645d8841f51 | 198 | } |
bogdanm | 13:0645d8841f51 | 199 | stop_bits -= 1; |
bogdanm | 13:0645d8841f51 | 200 | |
bogdanm | 13:0645d8841f51 | 201 | // 0: 5 data bits ... 3: 8 data bits |
bogdanm | 13:0645d8841f51 | 202 | if (data_bits < 5 || data_bits > 8) { |
bogdanm | 13:0645d8841f51 | 203 | error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits); |
bogdanm | 13:0645d8841f51 | 204 | } |
bogdanm | 13:0645d8841f51 | 205 | data_bits -= 5; |
bogdanm | 13:0645d8841f51 | 206 | |
bogdanm | 13:0645d8841f51 | 207 | int parity_enable, parity_select; |
bogdanm | 13:0645d8841f51 | 208 | switch (parity) { |
bogdanm | 13:0645d8841f51 | 209 | case ParityNone: parity_enable = 0; parity_select = 0; break; |
bogdanm | 13:0645d8841f51 | 210 | case ParityOdd : parity_enable = 1; parity_select = 0; break; |
bogdanm | 13:0645d8841f51 | 211 | case ParityEven: parity_enable = 1; parity_select = 1; break; |
bogdanm | 13:0645d8841f51 | 212 | case ParityForced1: parity_enable = 1; parity_select = 2; break; |
bogdanm | 13:0645d8841f51 | 213 | case ParityForced0: parity_enable = 1; parity_select = 3; break; |
bogdanm | 13:0645d8841f51 | 214 | default: |
bogdanm | 13:0645d8841f51 | 215 | error("Invalid serial parity setting"); |
bogdanm | 13:0645d8841f51 | 216 | return; |
bogdanm | 13:0645d8841f51 | 217 | } |
bogdanm | 13:0645d8841f51 | 218 | |
bogdanm | 13:0645d8841f51 | 219 | obj->uart->LCR = data_bits << 0 |
bogdanm | 13:0645d8841f51 | 220 | | stop_bits << 2 |
bogdanm | 13:0645d8841f51 | 221 | | parity_enable << 3 |
bogdanm | 13:0645d8841f51 | 222 | | parity_select << 4; |
bogdanm | 13:0645d8841f51 | 223 | } |
bogdanm | 13:0645d8841f51 | 224 | |
bogdanm | 13:0645d8841f51 | 225 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 226 | * INTERRUPTS HANDLING |
bogdanm | 13:0645d8841f51 | 227 | ******************************************************************************/ |
bogdanm | 13:0645d8841f51 | 228 | static inline void uart_irq(uint32_t iir, uint32_t index) { |
bogdanm | 13:0645d8841f51 | 229 | // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling |
bogdanm | 13:0645d8841f51 | 230 | SerialIrq irq_type; |
bogdanm | 13:0645d8841f51 | 231 | switch (iir) { |
bogdanm | 13:0645d8841f51 | 232 | case 1: irq_type = TxIrq; break; |
bogdanm | 13:0645d8841f51 | 233 | case 2: irq_type = RxIrq; break; |
bogdanm | 13:0645d8841f51 | 234 | default: return; |
bogdanm | 13:0645d8841f51 | 235 | } |
bogdanm | 13:0645d8841f51 | 236 | |
bogdanm | 13:0645d8841f51 | 237 | if (serial_irq_ids[index] != 0) |
bogdanm | 13:0645d8841f51 | 238 | irq_handler(serial_irq_ids[index], irq_type); |
bogdanm | 13:0645d8841f51 | 239 | } |
bogdanm | 13:0645d8841f51 | 240 | |
bogdanm | 13:0645d8841f51 | 241 | void uart0_irq() {uart_irq((LPC_UART0->IIR >> 1) & 0x7, 0);} |
bogdanm | 13:0645d8841f51 | 242 | void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1);} |
bogdanm | 13:0645d8841f51 | 243 | void uart2_irq() {uart_irq((LPC_UART2->IIR >> 1) & 0x7, 2);} |
bogdanm | 13:0645d8841f51 | 244 | void uart3_irq() {uart_irq((LPC_UART3->IIR >> 1) & 0x7, 3);} |
bogdanm | 13:0645d8841f51 | 245 | |
bogdanm | 13:0645d8841f51 | 246 | void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) { |
bogdanm | 13:0645d8841f51 | 247 | irq_handler = handler; |
bogdanm | 13:0645d8841f51 | 248 | serial_irq_ids[obj->index] = id; |
bogdanm | 13:0645d8841f51 | 249 | } |
bogdanm | 13:0645d8841f51 | 250 | |
bogdanm | 13:0645d8841f51 | 251 | void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) { |
bogdanm | 13:0645d8841f51 | 252 | IRQn_Type irq_n = (IRQn_Type)0; |
bogdanm | 13:0645d8841f51 | 253 | uint32_t vector = 0; |
bogdanm | 13:0645d8841f51 | 254 | switch ((int)obj->uart) { |
bogdanm | 13:0645d8841f51 | 255 | case UART_0: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break; |
bogdanm | 13:0645d8841f51 | 256 | case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break; |
bogdanm | 13:0645d8841f51 | 257 | case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break; |
bogdanm | 13:0645d8841f51 | 258 | case UART_3: irq_n=UART3_IRQn; vector = (uint32_t)&uart3_irq; break; |
bogdanm | 13:0645d8841f51 | 259 | } |
bogdanm | 13:0645d8841f51 | 260 | |
bogdanm | 13:0645d8841f51 | 261 | if (enable) { |
bogdanm | 13:0645d8841f51 | 262 | obj->uart->IER |= 1 << irq; |
bogdanm | 13:0645d8841f51 | 263 | NVIC_SetVector(irq_n, vector); |
bogdanm | 13:0645d8841f51 | 264 | NVIC_EnableIRQ(irq_n); |
bogdanm | 13:0645d8841f51 | 265 | } else { // disable |
bogdanm | 13:0645d8841f51 | 266 | int all_disabled = 0; |
bogdanm | 13:0645d8841f51 | 267 | SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq); |
bogdanm | 13:0645d8841f51 | 268 | obj->uart->IER &= ~(1 << irq); |
bogdanm | 13:0645d8841f51 | 269 | all_disabled = (obj->uart->IER & (1 << other_irq)) == 0; |
bogdanm | 13:0645d8841f51 | 270 | if (all_disabled) |
bogdanm | 13:0645d8841f51 | 271 | NVIC_DisableIRQ(irq_n); |
bogdanm | 13:0645d8841f51 | 272 | } |
bogdanm | 13:0645d8841f51 | 273 | } |
bogdanm | 13:0645d8841f51 | 274 | |
bogdanm | 13:0645d8841f51 | 275 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 276 | * READ/WRITE |
bogdanm | 13:0645d8841f51 | 277 | ******************************************************************************/ |
bogdanm | 13:0645d8841f51 | 278 | int serial_getc(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 279 | while (!serial_readable(obj)); |
bogdanm | 13:0645d8841f51 | 280 | return obj->uart->RBR; |
bogdanm | 13:0645d8841f51 | 281 | } |
bogdanm | 13:0645d8841f51 | 282 | |
bogdanm | 13:0645d8841f51 | 283 | void serial_putc(serial_t *obj, int c) { |
bogdanm | 13:0645d8841f51 | 284 | while (!serial_writable(obj)); |
bogdanm | 13:0645d8841f51 | 285 | obj->uart->THR = c; |
bogdanm | 13:0645d8841f51 | 286 | |
bogdanm | 13:0645d8841f51 | 287 | uint32_t lsr = obj->uart->LSR; |
bogdanm | 13:0645d8841f51 | 288 | lsr = lsr; |
bogdanm | 13:0645d8841f51 | 289 | uint32_t thr = obj->uart->THR; |
bogdanm | 13:0645d8841f51 | 290 | thr = thr; |
bogdanm | 13:0645d8841f51 | 291 | } |
bogdanm | 13:0645d8841f51 | 292 | |
bogdanm | 13:0645d8841f51 | 293 | int serial_readable(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 294 | return obj->uart->LSR & 0x01; |
bogdanm | 13:0645d8841f51 | 295 | } |
bogdanm | 13:0645d8841f51 | 296 | |
bogdanm | 13:0645d8841f51 | 297 | int serial_writable(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 298 | return obj->uart->LSR & 0x20; |
bogdanm | 13:0645d8841f51 | 299 | } |
bogdanm | 13:0645d8841f51 | 300 | |
bogdanm | 13:0645d8841f51 | 301 | void serial_clear(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 302 | obj->uart->FCR = 1 << 1 // rx FIFO reset |
bogdanm | 13:0645d8841f51 | 303 | | 1 << 2 // tx FIFO reset |
bogdanm | 13:0645d8841f51 | 304 | | 0 << 6; // interrupt depth |
bogdanm | 13:0645d8841f51 | 305 | } |
bogdanm | 13:0645d8841f51 | 306 | |
bogdanm | 13:0645d8841f51 | 307 | void serial_pinout_tx(PinName tx) { |
bogdanm | 13:0645d8841f51 | 308 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 309 | } |
bogdanm | 13:0645d8841f51 | 310 | |
bogdanm | 13:0645d8841f51 | 311 | void serial_break_set(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 312 | obj->uart->LCR |= (1 << 6); |
bogdanm | 13:0645d8841f51 | 313 | } |
bogdanm | 13:0645d8841f51 | 314 | |
bogdanm | 13:0645d8841f51 | 315 | void serial_break_clear(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 316 | obj->uart->LCR &= ~(1 << 6); |
bogdanm | 13:0645d8841f51 | 317 | } |
bogdanm | 13:0645d8841f51 | 318 |