mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c@108:4cb9db2ced35, 2014-03-03 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Mar 03 11:15:08 2014 +0000
- Revision:
- 108:4cb9db2ced35
- Parent:
- 64:7b352733b00a
- Child:
- 109:bc5f94f2a67f
Synchronized with git revision 8431561fc77ff70cb9536a99659afac9e80a8611
Full URL: https://github.com/mbedmicro/mbed/commit/8431561fc77ff70cb9536a99659afac9e80a8611/
LPC1768 writeable fix + KL25Z/KL46Z RTC pin function
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
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" |
mbed_official | 64:7b352733b00a | 24 | #include "gpio_api.h" |
bogdanm | 13:0645d8841f51 | 25 | |
bogdanm | 13:0645d8841f51 | 26 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 27 | * INITIALIZATION |
bogdanm | 13:0645d8841f51 | 28 | ******************************************************************************/ |
bogdanm | 13:0645d8841f51 | 29 | #define UART_NUM 4 |
bogdanm | 13:0645d8841f51 | 30 | |
bogdanm | 13:0645d8841f51 | 31 | static const PinMap PinMap_UART_TX[] = { |
bogdanm | 13:0645d8841f51 | 32 | {P0_0, UART_3, 2}, |
bogdanm | 13:0645d8841f51 | 33 | {P0_2, UART_0, 1}, |
bogdanm | 13:0645d8841f51 | 34 | {P0_10, UART_2, 1}, |
bogdanm | 13:0645d8841f51 | 35 | {P0_15, UART_1, 1}, |
bogdanm | 13:0645d8841f51 | 36 | {P0_25, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 37 | {P2_0 , UART_1, 2}, |
bogdanm | 13:0645d8841f51 | 38 | {P2_8 , UART_2, 2}, |
bogdanm | 13:0645d8841f51 | 39 | {P4_28, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 40 | {NC , NC , 0} |
bogdanm | 13:0645d8841f51 | 41 | }; |
bogdanm | 13:0645d8841f51 | 42 | |
bogdanm | 13:0645d8841f51 | 43 | static const PinMap PinMap_UART_RX[] = { |
bogdanm | 13:0645d8841f51 | 44 | {P0_1 , UART_3, 2}, |
bogdanm | 13:0645d8841f51 | 45 | {P0_3 , UART_0, 1}, |
bogdanm | 13:0645d8841f51 | 46 | {P0_11, UART_2, 1}, |
bogdanm | 13:0645d8841f51 | 47 | {P0_16, UART_1, 1}, |
bogdanm | 13:0645d8841f51 | 48 | {P0_26, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 49 | {P2_1 , UART_1, 2}, |
bogdanm | 13:0645d8841f51 | 50 | {P2_9 , UART_2, 2}, |
bogdanm | 13:0645d8841f51 | 51 | {P4_29, UART_3, 3}, |
bogdanm | 13:0645d8841f51 | 52 | {NC , NC , 0} |
bogdanm | 13:0645d8841f51 | 53 | }; |
bogdanm | 13:0645d8841f51 | 54 | |
mbed_official | 64:7b352733b00a | 55 | static const PinMap PinMap_UART_RTS[] = { |
mbed_official | 64:7b352733b00a | 56 | {P0_22, UART_1, 1}, |
mbed_official | 64:7b352733b00a | 57 | {P2_7, UART_1, 2}, |
mbed_official | 64:7b352733b00a | 58 | {NC, NC, 0} |
mbed_official | 64:7b352733b00a | 59 | }; |
mbed_official | 64:7b352733b00a | 60 | |
mbed_official | 64:7b352733b00a | 61 | static const PinMap PinMap_UART_CTS[] = { |
mbed_official | 64:7b352733b00a | 62 | {P0_17, UART_1, 1}, |
mbed_official | 64:7b352733b00a | 63 | {P2_2, UART_1, 2}, |
mbed_official | 64:7b352733b00a | 64 | {NC, NC, 0} |
mbed_official | 64:7b352733b00a | 65 | }; |
mbed_official | 64:7b352733b00a | 66 | |
mbed_official | 64:7b352733b00a | 67 | #define UART_MCR_RTSEN_MASK (1 << 6) |
mbed_official | 64:7b352733b00a | 68 | #define UART_MCR_CTSEN_MASK (1 << 7) |
mbed_official | 64:7b352733b00a | 69 | #define UART_MCR_FLOWCTRL_MASK (UART_MCR_RTSEN_MASK | UART_MCR_CTSEN_MASK) |
mbed_official | 64:7b352733b00a | 70 | |
bogdanm | 13:0645d8841f51 | 71 | static uart_irq_handler irq_handler; |
bogdanm | 13:0645d8841f51 | 72 | |
bogdanm | 13:0645d8841f51 | 73 | int stdio_uart_inited = 0; |
bogdanm | 13:0645d8841f51 | 74 | serial_t stdio_uart; |
bogdanm | 13:0645d8841f51 | 75 | |
mbed_official | 64:7b352733b00a | 76 | struct serial_global_data_s { |
mbed_official | 64:7b352733b00a | 77 | uint32_t serial_irq_id; |
mbed_official | 64:7b352733b00a | 78 | gpio_t sw_rts, sw_cts; |
mbed_official | 64:7b352733b00a | 79 | uint8_t rx_irq_set_flow, rx_irq_set_api; |
mbed_official | 64:7b352733b00a | 80 | }; |
mbed_official | 64:7b352733b00a | 81 | |
mbed_official | 64:7b352733b00a | 82 | static struct serial_global_data_s uart_data[UART_NUM]; |
mbed_official | 64:7b352733b00a | 83 | |
bogdanm | 13:0645d8841f51 | 84 | void serial_init(serial_t *obj, PinName tx, PinName rx) { |
bogdanm | 13:0645d8841f51 | 85 | int is_stdio_uart = 0; |
bogdanm | 13:0645d8841f51 | 86 | |
bogdanm | 13:0645d8841f51 | 87 | // determine the UART to use |
bogdanm | 13:0645d8841f51 | 88 | UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 89 | UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX); |
bogdanm | 13:0645d8841f51 | 90 | UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx); |
bogdanm | 13:0645d8841f51 | 91 | if ((int)uart == NC) { |
bogdanm | 13:0645d8841f51 | 92 | error("Serial pinout mapping failed"); |
bogdanm | 13:0645d8841f51 | 93 | } |
bogdanm | 13:0645d8841f51 | 94 | |
bogdanm | 13:0645d8841f51 | 95 | obj->uart = (LPC_UART_TypeDef *)uart; |
bogdanm | 13:0645d8841f51 | 96 | // enable power |
bogdanm | 13:0645d8841f51 | 97 | switch (uart) { |
bogdanm | 13:0645d8841f51 | 98 | case UART_0: LPC_SC->PCONP |= 1 << 3; break; |
bogdanm | 13:0645d8841f51 | 99 | case UART_1: LPC_SC->PCONP |= 1 << 4; break; |
bogdanm | 13:0645d8841f51 | 100 | case UART_2: LPC_SC->PCONP |= 1 << 24; break; |
bogdanm | 13:0645d8841f51 | 101 | case UART_3: LPC_SC->PCONP |= 1 << 25; break; |
bogdanm | 13:0645d8841f51 | 102 | } |
bogdanm | 13:0645d8841f51 | 103 | |
bogdanm | 13:0645d8841f51 | 104 | // enable fifos and default rx trigger level |
bogdanm | 13:0645d8841f51 | 105 | obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled |
bogdanm | 13:0645d8841f51 | 106 | | 0 << 1 // Rx Fifo Reset |
bogdanm | 13:0645d8841f51 | 107 | | 0 << 2 // Tx Fifo Reset |
bogdanm | 13:0645d8841f51 | 108 | | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars |
bogdanm | 13:0645d8841f51 | 109 | |
bogdanm | 13:0645d8841f51 | 110 | // disable irqs |
bogdanm | 13:0645d8841f51 | 111 | obj->uart->IER = 0 << 0 // Rx Data available irq enable |
bogdanm | 13:0645d8841f51 | 112 | | 0 << 1 // Tx Fifo empty irq enable |
bogdanm | 13:0645d8841f51 | 113 | | 0 << 2; // Rx Line Status irq enable |
bogdanm | 13:0645d8841f51 | 114 | |
bogdanm | 13:0645d8841f51 | 115 | // set default baud rate and format |
bogdanm | 13:0645d8841f51 | 116 | serial_baud (obj, 9600); |
bogdanm | 13:0645d8841f51 | 117 | serial_format(obj, 8, ParityNone, 1); |
bogdanm | 13:0645d8841f51 | 118 | |
bogdanm | 13:0645d8841f51 | 119 | // pinout the chosen uart |
bogdanm | 13:0645d8841f51 | 120 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 121 | pinmap_pinout(rx, PinMap_UART_RX); |
bogdanm | 13:0645d8841f51 | 122 | |
bogdanm | 13:0645d8841f51 | 123 | // set rx/tx pins in PullUp mode |
bogdanm | 13:0645d8841f51 | 124 | pin_mode(tx, PullUp); |
bogdanm | 13:0645d8841f51 | 125 | pin_mode(rx, PullUp); |
bogdanm | 13:0645d8841f51 | 126 | |
bogdanm | 13:0645d8841f51 | 127 | switch (uart) { |
bogdanm | 13:0645d8841f51 | 128 | case UART_0: obj->index = 0; break; |
bogdanm | 13:0645d8841f51 | 129 | case UART_1: obj->index = 1; break; |
bogdanm | 13:0645d8841f51 | 130 | case UART_2: obj->index = 2; break; |
bogdanm | 13:0645d8841f51 | 131 | case UART_3: obj->index = 3; break; |
bogdanm | 13:0645d8841f51 | 132 | } |
mbed_official | 64:7b352733b00a | 133 | uart_data[obj->index].sw_rts.pin = NC; |
mbed_official | 64:7b352733b00a | 134 | uart_data[obj->index].sw_cts.pin = NC; |
mbed_official | 64:7b352733b00a | 135 | serial_set_flow_control(obj, FlowControlNone, NC, NC); |
bogdanm | 13:0645d8841f51 | 136 | |
bogdanm | 13:0645d8841f51 | 137 | is_stdio_uart = (uart == STDIO_UART) ? (1) : (0); |
bogdanm | 13:0645d8841f51 | 138 | |
bogdanm | 13:0645d8841f51 | 139 | if (is_stdio_uart) { |
bogdanm | 13:0645d8841f51 | 140 | stdio_uart_inited = 1; |
bogdanm | 13:0645d8841f51 | 141 | memcpy(&stdio_uart, obj, sizeof(serial_t)); |
bogdanm | 13:0645d8841f51 | 142 | } |
bogdanm | 13:0645d8841f51 | 143 | } |
bogdanm | 13:0645d8841f51 | 144 | |
bogdanm | 13:0645d8841f51 | 145 | void serial_free(serial_t *obj) { |
mbed_official | 64:7b352733b00a | 146 | uart_data[obj->index].serial_irq_id = 0; |
bogdanm | 13:0645d8841f51 | 147 | } |
bogdanm | 13:0645d8841f51 | 148 | |
bogdanm | 13:0645d8841f51 | 149 | // serial_baud |
bogdanm | 13:0645d8841f51 | 150 | // set the baud rate, taking in to account the current SystemFrequency |
bogdanm | 13:0645d8841f51 | 151 | void serial_baud(serial_t *obj, int baudrate) { |
bogdanm | 13:0645d8841f51 | 152 | // The LPC2300 and LPC1700 have a divider and a fractional divider to control the |
bogdanm | 13:0645d8841f51 | 153 | // baud rate. The formula is: |
bogdanm | 13:0645d8841f51 | 154 | // |
bogdanm | 13:0645d8841f51 | 155 | // Baudrate = (1 / PCLK) * 16 * DL * (1 + DivAddVal / MulVal) |
bogdanm | 13:0645d8841f51 | 156 | // where: |
bogdanm | 13:0645d8841f51 | 157 | // 1 < MulVal <= 15 |
bogdanm | 13:0645d8841f51 | 158 | // 0 <= DivAddVal < 14 |
bogdanm | 13:0645d8841f51 | 159 | // DivAddVal < MulVal |
bogdanm | 13:0645d8841f51 | 160 | // |
bogdanm | 13:0645d8841f51 | 161 | // set pclk to /1 |
bogdanm | 13:0645d8841f51 | 162 | switch ((int)obj->uart) { |
bogdanm | 13:0645d8841f51 | 163 | case UART_0: LPC_SC->PCLKSEL0 &= ~(0x3 << 6); LPC_SC->PCLKSEL0 |= (0x1 << 6); break; |
bogdanm | 13:0645d8841f51 | 164 | case UART_1: LPC_SC->PCLKSEL0 &= ~(0x3 << 8); LPC_SC->PCLKSEL0 |= (0x1 << 8); break; |
bogdanm | 13:0645d8841f51 | 165 | case UART_2: LPC_SC->PCLKSEL1 &= ~(0x3 << 16); LPC_SC->PCLKSEL1 |= (0x1 << 16); break; |
bogdanm | 13:0645d8841f51 | 166 | case UART_3: LPC_SC->PCLKSEL1 &= ~(0x3 << 18); LPC_SC->PCLKSEL1 |= (0x1 << 18); break; |
bogdanm | 13:0645d8841f51 | 167 | default: error("serial_baud"); break; |
bogdanm | 13:0645d8841f51 | 168 | } |
bogdanm | 13:0645d8841f51 | 169 | |
bogdanm | 13:0645d8841f51 | 170 | uint32_t PCLK = SystemCoreClock; |
bogdanm | 13:0645d8841f51 | 171 | |
bogdanm | 13:0645d8841f51 | 172 | // First we check to see if the basic divide with no DivAddVal/MulVal |
bogdanm | 13:0645d8841f51 | 173 | // ratio gives us an integer result. If it does, we set DivAddVal = 0, |
bogdanm | 13:0645d8841f51 | 174 | // MulVal = 1. Otherwise, we search the valid ratio value range to find |
bogdanm | 13:0645d8841f51 | 175 | // the closest match. This could be more elegant, using search methods |
bogdanm | 13:0645d8841f51 | 176 | // and/or lookup tables, but the brute force method is not that much |
bogdanm | 13:0645d8841f51 | 177 | // slower, and is more maintainable. |
bogdanm | 13:0645d8841f51 | 178 | uint16_t DL = PCLK / (16 * baudrate); |
bogdanm | 13:0645d8841f51 | 179 | |
bogdanm | 13:0645d8841f51 | 180 | uint8_t DivAddVal = 0; |
bogdanm | 13:0645d8841f51 | 181 | uint8_t MulVal = 1; |
bogdanm | 13:0645d8841f51 | 182 | int hit = 0; |
bogdanm | 13:0645d8841f51 | 183 | uint16_t dlv; |
bogdanm | 13:0645d8841f51 | 184 | uint8_t mv, dav; |
bogdanm | 13:0645d8841f51 | 185 | if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder |
mbed_official | 51:7838415c99e7 | 186 | int err_best = baudrate, b; |
mbed_official | 51:7838415c99e7 | 187 | for (mv = 1; mv < 16 && !hit; mv++) |
mbed_official | 51:7838415c99e7 | 188 | { |
mbed_official | 51:7838415c99e7 | 189 | for (dav = 0; dav < mv; dav++) |
mbed_official | 51:7838415c99e7 | 190 | { |
mbed_official | 51:7838415c99e7 | 191 | // baudrate = PCLK / (16 * dlv * (1 + (DivAdd / Mul)) |
mbed_official | 51:7838415c99e7 | 192 | // solving for dlv, we get dlv = mul * PCLK / (16 * baudrate * (divadd + mul)) |
mbed_official | 51:7838415c99e7 | 193 | // mul has 4 bits, PCLK has 27 so we have 1 bit headroom which can be used for rounding |
mbed_official | 51:7838415c99e7 | 194 | // 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 | 195 | // note: X / 32 doesn't round correctly. Instead, we use ((X / 16) + 1) / 2 for correct rounding |
mbed_official | 51:7838415c99e7 | 196 | |
mbed_official | 51:7838415c99e7 | 197 | if ((mv * PCLK * 2) & 0x80000000) // 1 bit headroom |
mbed_official | 51:7838415c99e7 | 198 | dlv = ((((2 * mv * PCLK) / (baudrate * (dav + mv))) / 16) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 199 | else // 2 bits headroom, use more precision |
mbed_official | 51:7838415c99e7 | 200 | dlv = ((((4 * mv * PCLK) / (baudrate * (dav + mv))) / 32) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 201 | |
mbed_official | 51:7838415c99e7 | 202 | // datasheet says if DLL==DLM==0, then 1 is used instead since divide by zero is ungood |
mbed_official | 51:7838415c99e7 | 203 | if (dlv == 0) |
mbed_official | 51:7838415c99e7 | 204 | dlv = 1; |
mbed_official | 51:7838415c99e7 | 205 | |
mbed_official | 51:7838415c99e7 | 206 | // datasheet says if dav > 0 then DL must be >= 2 |
mbed_official | 51:7838415c99e7 | 207 | if ((dav > 0) && (dlv < 2)) |
mbed_official | 51:7838415c99e7 | 208 | dlv = 2; |
mbed_official | 51:7838415c99e7 | 209 | |
mbed_official | 51:7838415c99e7 | 210 | // integer rearrangement of the baudrate equation (with rounding) |
mbed_official | 51:7838415c99e7 | 211 | b = ((PCLK * mv / (dlv * (dav + mv) * 8)) + 1) / 2; |
mbed_official | 51:7838415c99e7 | 212 | |
mbed_official | 51:7838415c99e7 | 213 | // check to see how we went |
mbed_official | 51:7838415c99e7 | 214 | b = abs(b - baudrate); |
mbed_official | 51:7838415c99e7 | 215 | if (b < err_best) |
mbed_official | 51:7838415c99e7 | 216 | { |
mbed_official | 51:7838415c99e7 | 217 | err_best = b; |
mbed_official | 51:7838415c99e7 | 218 | |
mbed_official | 51:7838415c99e7 | 219 | DL = dlv; |
mbed_official | 51:7838415c99e7 | 220 | MulVal = mv; |
mbed_official | 51:7838415c99e7 | 221 | DivAddVal = dav; |
mbed_official | 51:7838415c99e7 | 222 | |
mbed_official | 51:7838415c99e7 | 223 | if (b == baudrate) |
mbed_official | 51:7838415c99e7 | 224 | { |
mbed_official | 51:7838415c99e7 | 225 | hit = 1; |
mbed_official | 51:7838415c99e7 | 226 | break; |
bogdanm | 13:0645d8841f51 | 227 | } |
bogdanm | 13:0645d8841f51 | 228 | } |
bogdanm | 13:0645d8841f51 | 229 | } |
bogdanm | 13:0645d8841f51 | 230 | } |
bogdanm | 13:0645d8841f51 | 231 | } |
bogdanm | 13:0645d8841f51 | 232 | |
bogdanm | 13:0645d8841f51 | 233 | // set LCR[DLAB] to enable writing to divider registers |
bogdanm | 13:0645d8841f51 | 234 | obj->uart->LCR |= (1 << 7); |
bogdanm | 13:0645d8841f51 | 235 | |
bogdanm | 13:0645d8841f51 | 236 | // set divider values |
bogdanm | 13:0645d8841f51 | 237 | obj->uart->DLM = (DL >> 8) & 0xFF; |
bogdanm | 13:0645d8841f51 | 238 | obj->uart->DLL = (DL >> 0) & 0xFF; |
bogdanm | 13:0645d8841f51 | 239 | obj->uart->FDR = (uint32_t) DivAddVal << 0 |
bogdanm | 13:0645d8841f51 | 240 | | (uint32_t) MulVal << 4; |
bogdanm | 13:0645d8841f51 | 241 | |
bogdanm | 13:0645d8841f51 | 242 | // clear LCR[DLAB] |
bogdanm | 13:0645d8841f51 | 243 | obj->uart->LCR &= ~(1 << 7); |
bogdanm | 13:0645d8841f51 | 244 | } |
bogdanm | 13:0645d8841f51 | 245 | |
bogdanm | 13:0645d8841f51 | 246 | void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { |
bogdanm | 13:0645d8841f51 | 247 | // 0: 1 stop bits, 1: 2 stop bits |
bogdanm | 13:0645d8841f51 | 248 | if (stop_bits != 1 && stop_bits != 2) { |
bogdanm | 13:0645d8841f51 | 249 | error("Invalid stop bits specified"); |
bogdanm | 13:0645d8841f51 | 250 | } |
bogdanm | 13:0645d8841f51 | 251 | stop_bits -= 1; |
bogdanm | 13:0645d8841f51 | 252 | |
bogdanm | 13:0645d8841f51 | 253 | // 0: 5 data bits ... 3: 8 data bits |
bogdanm | 13:0645d8841f51 | 254 | if (data_bits < 5 || data_bits > 8) { |
bogdanm | 13:0645d8841f51 | 255 | error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits); |
bogdanm | 13:0645d8841f51 | 256 | } |
bogdanm | 13:0645d8841f51 | 257 | data_bits -= 5; |
bogdanm | 13:0645d8841f51 | 258 | |
bogdanm | 13:0645d8841f51 | 259 | int parity_enable, parity_select; |
bogdanm | 13:0645d8841f51 | 260 | switch (parity) { |
bogdanm | 13:0645d8841f51 | 261 | case ParityNone: parity_enable = 0; parity_select = 0; break; |
bogdanm | 13:0645d8841f51 | 262 | case ParityOdd : parity_enable = 1; parity_select = 0; break; |
bogdanm | 13:0645d8841f51 | 263 | case ParityEven: parity_enable = 1; parity_select = 1; break; |
bogdanm | 13:0645d8841f51 | 264 | case ParityForced1: parity_enable = 1; parity_select = 2; break; |
bogdanm | 13:0645d8841f51 | 265 | case ParityForced0: parity_enable = 1; parity_select = 3; break; |
bogdanm | 13:0645d8841f51 | 266 | default: |
bogdanm | 13:0645d8841f51 | 267 | error("Invalid serial parity setting"); |
bogdanm | 13:0645d8841f51 | 268 | return; |
bogdanm | 13:0645d8841f51 | 269 | } |
bogdanm | 13:0645d8841f51 | 270 | |
bogdanm | 13:0645d8841f51 | 271 | obj->uart->LCR = data_bits << 0 |
bogdanm | 13:0645d8841f51 | 272 | | stop_bits << 2 |
bogdanm | 13:0645d8841f51 | 273 | | parity_enable << 3 |
bogdanm | 13:0645d8841f51 | 274 | | parity_select << 4; |
bogdanm | 13:0645d8841f51 | 275 | } |
bogdanm | 13:0645d8841f51 | 276 | |
bogdanm | 13:0645d8841f51 | 277 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 278 | * INTERRUPTS HANDLING |
bogdanm | 13:0645d8841f51 | 279 | ******************************************************************************/ |
mbed_official | 64:7b352733b00a | 280 | static inline void uart_irq(uint32_t iir, uint32_t index, LPC_UART_TypeDef *puart) { |
bogdanm | 13:0645d8841f51 | 281 | // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling |
bogdanm | 13:0645d8841f51 | 282 | SerialIrq irq_type; |
bogdanm | 13:0645d8841f51 | 283 | switch (iir) { |
bogdanm | 13:0645d8841f51 | 284 | case 1: irq_type = TxIrq; break; |
bogdanm | 13:0645d8841f51 | 285 | case 2: irq_type = RxIrq; break; |
bogdanm | 13:0645d8841f51 | 286 | default: return; |
bogdanm | 13:0645d8841f51 | 287 | } |
mbed_official | 64:7b352733b00a | 288 | if ((RxIrq == irq_type) && (NC != uart_data[index].sw_rts.pin)) { |
mbed_official | 64:7b352733b00a | 289 | gpio_write(&uart_data[index].sw_rts, 1); |
mbed_official | 64:7b352733b00a | 290 | // Disable interrupt if it wasn't enabled by other part of the application |
mbed_official | 64:7b352733b00a | 291 | if (!uart_data[index].rx_irq_set_api) |
mbed_official | 64:7b352733b00a | 292 | puart->IER &= ~(1 << RxIrq); |
mbed_official | 64:7b352733b00a | 293 | } |
mbed_official | 64:7b352733b00a | 294 | if (uart_data[index].serial_irq_id != 0) |
mbed_official | 64:7b352733b00a | 295 | if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api)) |
mbed_official | 64:7b352733b00a | 296 | irq_handler(uart_data[index].serial_irq_id, irq_type); |
bogdanm | 13:0645d8841f51 | 297 | } |
bogdanm | 13:0645d8841f51 | 298 | |
mbed_official | 64:7b352733b00a | 299 | void uart0_irq() {uart_irq((LPC_UART0->IIR >> 1) & 0x7, 0, (LPC_UART_TypeDef*)LPC_UART0);} |
mbed_official | 64:7b352733b00a | 300 | void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1, (LPC_UART_TypeDef*)LPC_UART1);} |
mbed_official | 64:7b352733b00a | 301 | void uart2_irq() {uart_irq((LPC_UART2->IIR >> 1) & 0x7, 2, (LPC_UART_TypeDef*)LPC_UART2);} |
mbed_official | 64:7b352733b00a | 302 | void uart3_irq() {uart_irq((LPC_UART3->IIR >> 1) & 0x7, 3, (LPC_UART_TypeDef*)LPC_UART3);} |
bogdanm | 13:0645d8841f51 | 303 | |
bogdanm | 13:0645d8841f51 | 304 | void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) { |
bogdanm | 13:0645d8841f51 | 305 | irq_handler = handler; |
mbed_official | 64:7b352733b00a | 306 | uart_data[obj->index].serial_irq_id = id; |
bogdanm | 13:0645d8841f51 | 307 | } |
bogdanm | 13:0645d8841f51 | 308 | |
mbed_official | 64:7b352733b00a | 309 | static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) { |
bogdanm | 13:0645d8841f51 | 310 | IRQn_Type irq_n = (IRQn_Type)0; |
bogdanm | 13:0645d8841f51 | 311 | uint32_t vector = 0; |
bogdanm | 13:0645d8841f51 | 312 | switch ((int)obj->uart) { |
bogdanm | 13:0645d8841f51 | 313 | case UART_0: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break; |
bogdanm | 13:0645d8841f51 | 314 | case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break; |
bogdanm | 13:0645d8841f51 | 315 | case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break; |
bogdanm | 13:0645d8841f51 | 316 | case UART_3: irq_n=UART3_IRQn; vector = (uint32_t)&uart3_irq; break; |
bogdanm | 13:0645d8841f51 | 317 | } |
bogdanm | 13:0645d8841f51 | 318 | |
bogdanm | 13:0645d8841f51 | 319 | if (enable) { |
bogdanm | 13:0645d8841f51 | 320 | obj->uart->IER |= 1 << irq; |
bogdanm | 13:0645d8841f51 | 321 | NVIC_SetVector(irq_n, vector); |
bogdanm | 13:0645d8841f51 | 322 | NVIC_EnableIRQ(irq_n); |
mbed_official | 64:7b352733b00a | 323 | } else if ((TxIrq == irq) || (uart_data[obj->index].rx_irq_set_api + uart_data[obj->index].rx_irq_set_flow == 0)) { // disable |
bogdanm | 13:0645d8841f51 | 324 | int all_disabled = 0; |
bogdanm | 13:0645d8841f51 | 325 | SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq); |
bogdanm | 13:0645d8841f51 | 326 | obj->uart->IER &= ~(1 << irq); |
bogdanm | 13:0645d8841f51 | 327 | all_disabled = (obj->uart->IER & (1 << other_irq)) == 0; |
bogdanm | 13:0645d8841f51 | 328 | if (all_disabled) |
bogdanm | 13:0645d8841f51 | 329 | NVIC_DisableIRQ(irq_n); |
bogdanm | 13:0645d8841f51 | 330 | } |
bogdanm | 13:0645d8841f51 | 331 | } |
bogdanm | 13:0645d8841f51 | 332 | |
mbed_official | 64:7b352733b00a | 333 | void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) { |
mbed_official | 64:7b352733b00a | 334 | if (RxIrq == irq) |
mbed_official | 64:7b352733b00a | 335 | uart_data[obj->index].rx_irq_set_api = enable; |
mbed_official | 64:7b352733b00a | 336 | serial_irq_set_internal(obj, irq, enable); |
mbed_official | 64:7b352733b00a | 337 | } |
mbed_official | 64:7b352733b00a | 338 | |
mbed_official | 64:7b352733b00a | 339 | static void serial_flow_irq_set(serial_t *obj, uint32_t enable) { |
mbed_official | 64:7b352733b00a | 340 | uart_data[obj->index].rx_irq_set_flow = enable; |
mbed_official | 64:7b352733b00a | 341 | serial_irq_set_internal(obj, RxIrq, enable); |
mbed_official | 64:7b352733b00a | 342 | } |
mbed_official | 64:7b352733b00a | 343 | |
bogdanm | 13:0645d8841f51 | 344 | /****************************************************************************** |
bogdanm | 13:0645d8841f51 | 345 | * READ/WRITE |
bogdanm | 13:0645d8841f51 | 346 | ******************************************************************************/ |
bogdanm | 13:0645d8841f51 | 347 | int serial_getc(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 348 | while (!serial_readable(obj)); |
mbed_official | 64:7b352733b00a | 349 | int data = obj->uart->RBR; |
mbed_official | 64:7b352733b00a | 350 | if (NC != uart_data[obj->index].sw_rts.pin) { |
mbed_official | 64:7b352733b00a | 351 | gpio_write(&uart_data[obj->index].sw_rts, 0); |
mbed_official | 64:7b352733b00a | 352 | obj->uart->IER |= 1 << RxIrq; |
mbed_official | 64:7b352733b00a | 353 | } |
mbed_official | 64:7b352733b00a | 354 | return data; |
bogdanm | 13:0645d8841f51 | 355 | } |
bogdanm | 13:0645d8841f51 | 356 | |
bogdanm | 13:0645d8841f51 | 357 | void serial_putc(serial_t *obj, int c) { |
bogdanm | 13:0645d8841f51 | 358 | while (!serial_writable(obj)); |
bogdanm | 13:0645d8841f51 | 359 | obj->uart->THR = c; |
bogdanm | 13:0645d8841f51 | 360 | } |
bogdanm | 13:0645d8841f51 | 361 | |
bogdanm | 13:0645d8841f51 | 362 | int serial_readable(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 363 | return obj->uart->LSR & 0x01; |
bogdanm | 13:0645d8841f51 | 364 | } |
bogdanm | 13:0645d8841f51 | 365 | |
bogdanm | 13:0645d8841f51 | 366 | int serial_writable(serial_t *obj) { |
mbed_official | 64:7b352733b00a | 367 | if (NC != uart_data[obj->index].sw_cts.pin) |
mbed_official | 108:4cb9db2ced35 | 368 | return (gpio_read(&uart_data[obj->index].sw_cts) == 0) && (obj->uart->LSR & 0x40); //If flow control: writable if CTS low + UART done |
mbed_official | 108:4cb9db2ced35 | 369 | else |
mbed_official | 108:4cb9db2ced35 | 370 | return obj->uart->LSR & 0x20; //No flow control: writable if space in holding register |
bogdanm | 13:0645d8841f51 | 371 | } |
bogdanm | 13:0645d8841f51 | 372 | |
bogdanm | 13:0645d8841f51 | 373 | void serial_clear(serial_t *obj) { |
bogdanm | 20:4263a77256ae | 374 | obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled |
bogdanm | 20:4263a77256ae | 375 | | 1 << 1 // rx FIFO reset |
bogdanm | 13:0645d8841f51 | 376 | | 1 << 2 // tx FIFO reset |
bogdanm | 13:0645d8841f51 | 377 | | 0 << 6; // interrupt depth |
bogdanm | 13:0645d8841f51 | 378 | } |
bogdanm | 13:0645d8841f51 | 379 | |
bogdanm | 13:0645d8841f51 | 380 | void serial_pinout_tx(PinName tx) { |
bogdanm | 13:0645d8841f51 | 381 | pinmap_pinout(tx, PinMap_UART_TX); |
bogdanm | 13:0645d8841f51 | 382 | } |
bogdanm | 13:0645d8841f51 | 383 | |
bogdanm | 13:0645d8841f51 | 384 | void serial_break_set(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 385 | obj->uart->LCR |= (1 << 6); |
bogdanm | 13:0645d8841f51 | 386 | } |
bogdanm | 13:0645d8841f51 | 387 | |
bogdanm | 13:0645d8841f51 | 388 | void serial_break_clear(serial_t *obj) { |
bogdanm | 13:0645d8841f51 | 389 | obj->uart->LCR &= ~(1 << 6); |
bogdanm | 13:0645d8841f51 | 390 | } |
bogdanm | 13:0645d8841f51 | 391 | |
mbed_official | 64:7b352733b00a | 392 | void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) { |
mbed_official | 64:7b352733b00a | 393 | // Only UART1 has hardware flow control on LPC176x |
mbed_official | 64:7b352733b00a | 394 | LPC_UART1_TypeDef *uart1 = (uint32_t)obj->uart == (uint32_t)LPC_UART1 ? LPC_UART1 : NULL; |
mbed_official | 64:7b352733b00a | 395 | int index = obj->index; |
mbed_official | 64:7b352733b00a | 396 | |
mbed_official | 64:7b352733b00a | 397 | // First, disable flow control completely |
mbed_official | 64:7b352733b00a | 398 | if (uart1) |
mbed_official | 64:7b352733b00a | 399 | uart1->MCR = uart1->MCR & ~UART_MCR_FLOWCTRL_MASK; |
mbed_official | 64:7b352733b00a | 400 | uart_data[index].sw_rts.pin = uart_data[index].sw_cts.pin = NC; |
mbed_official | 64:7b352733b00a | 401 | serial_flow_irq_set(obj, 0); |
mbed_official | 64:7b352733b00a | 402 | if (FlowControlNone == type) |
mbed_official | 64:7b352733b00a | 403 | return; |
mbed_official | 64:7b352733b00a | 404 | // Check type(s) of flow control to use |
mbed_official | 64:7b352733b00a | 405 | UARTName uart_rts = (UARTName)pinmap_find_peripheral(rxflow, PinMap_UART_RTS); |
mbed_official | 64:7b352733b00a | 406 | UARTName uart_cts = (UARTName)pinmap_find_peripheral(txflow, PinMap_UART_CTS); |
mbed_official | 64:7b352733b00a | 407 | if (((FlowControlCTS == type) || (FlowControlRTSCTS == type)) && (NC != txflow)) { |
mbed_official | 64:7b352733b00a | 408 | // Can this be enabled in hardware? |
mbed_official | 64:7b352733b00a | 409 | if ((UART_1 == uart_cts) && (NULL != uart1)) { |
mbed_official | 64:7b352733b00a | 410 | // Enable auto-CTS mode |
mbed_official | 64:7b352733b00a | 411 | uart1->MCR |= UART_MCR_CTSEN_MASK; |
mbed_official | 64:7b352733b00a | 412 | pinmap_pinout(txflow, PinMap_UART_CTS); |
mbed_official | 64:7b352733b00a | 413 | } else { |
mbed_official | 64:7b352733b00a | 414 | // Can't enable in hardware, use software emulation |
mbed_official | 64:7b352733b00a | 415 | gpio_init(&uart_data[index].sw_cts, txflow, PIN_INPUT); |
mbed_official | 64:7b352733b00a | 416 | } |
mbed_official | 64:7b352733b00a | 417 | } |
mbed_official | 64:7b352733b00a | 418 | if (((FlowControlRTS == type) || (FlowControlRTSCTS == type)) && (NC != rxflow)) { |
mbed_official | 64:7b352733b00a | 419 | // Enable FIFOs, trigger level of 1 char on RX FIFO |
mbed_official | 64:7b352733b00a | 420 | obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled |
mbed_official | 64:7b352733b00a | 421 | | 1 << 1 // Rx Fifo Reset |
mbed_official | 64:7b352733b00a | 422 | | 1 << 2 // Tx Fifo Reset |
mbed_official | 64:7b352733b00a | 423 | | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars |
mbed_official | 64:7b352733b00a | 424 | // Can this be enabled in hardware? |
mbed_official | 64:7b352733b00a | 425 | if ((UART_1 == uart_rts) && (NULL != uart1)) { |
mbed_official | 64:7b352733b00a | 426 | // Enable auto-RTS mode |
mbed_official | 64:7b352733b00a | 427 | uart1->MCR |= UART_MCR_RTSEN_MASK; |
mbed_official | 64:7b352733b00a | 428 | pinmap_pinout(rxflow, PinMap_UART_RTS); |
mbed_official | 64:7b352733b00a | 429 | } else { // can't enable in hardware, use software emulation |
mbed_official | 64:7b352733b00a | 430 | gpio_init(&uart_data[index].sw_rts, rxflow, PIN_OUTPUT); |
mbed_official | 64:7b352733b00a | 431 | gpio_write(&uart_data[index].sw_rts, 0); |
mbed_official | 64:7b352733b00a | 432 | // Enable RX interrupt |
mbed_official | 64:7b352733b00a | 433 | serial_flow_irq_set(obj, 1); |
mbed_official | 64:7b352733b00a | 434 | } |
mbed_official | 64:7b352733b00a | 435 | } |
mbed_official | 64:7b352733b00a | 436 | } |
mbed_official | 64:7b352733b00a | 437 |