zhang boie / mbed-dev-f30333

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targets/TARGET_Freescale/TARGET_K20XX/serial_api.c@0:bdf663c61a82, 2022-06-14 (annotated)

Committer:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4
Date:
Tue Jun 14 09:21:18 2022 +0000
Revision:
0:bdf663c61a82
lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 1 /* mbed Microcontroller Library
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 2 * Copyright (c) 2006-2015 ARM Limited
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 3 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 4 * Licensed under the Apache License, Version 2.0 (the "License");
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 5 * you may not use this file except in compliance with the License.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 6 * You may obtain a copy of the License at
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 7 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 8 * http://www.apache.org/licenses/LICENSE-2.0
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 9 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 10 * Unless required by applicable law or agreed to in writing, software
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 11 * distributed under the License is distributed on an "AS IS" BASIS,
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 13 * See the License for the specific language governing permissions and
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 14 * limitations under the License.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 15 */
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 16 #include "mbed_assert.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 17 #include "serial_api.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 18
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 19 #include <string.h>
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 20
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 21 #include "cmsis.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 22 #include "pinmap.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 23 #include "clk_freqs.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 24 #include "PeripheralPins.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 25
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 26 #define UART_NUM 3
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 27
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 28 static uint32_t serial_irq_ids[UART_NUM] = {0};
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 29 static uart_irq_handler irq_handler;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 30
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 31 int stdio_uart_inited = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 32 serial_t stdio_uart;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 33
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 34 void serial_init(serial_t *obj, PinName tx, PinName rx) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 35 // determine the UART to use
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 36 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 37 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 38 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 39 MBED_ASSERT((int)uart != NC);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 40
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 41 obj->uart = (UART_Type *)uart;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 42 // enable clk
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 43 switch (uart) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 44 case UART_0:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 45 mcgpllfll_frequency();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 46 SIM->SCGC4 |= SIM_SCGC4_UART0_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 47 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 48 case UART_1:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 49 mcgpllfll_frequency();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 50 SIM->SCGC4 |= SIM_SCGC4_UART1_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 51 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 52 case UART_2:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 53 SIM->SCGC4 |= SIM_SCGC4_UART2_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 54 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 55 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 56 // Disable UART before changing registers
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 57 obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 58
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 59 switch (uart) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 60 case UART_0:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 61 obj->index = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 62 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 63 case UART_1:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 64 obj->index = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 65 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 66 case UART_2:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 67 obj->index = 2;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 68 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 69 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 70
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 71 // set default baud rate and format
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 72 serial_baud (obj, 9600);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 73 serial_format(obj, 8, ParityNone, 1);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 74
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 75 // pinout the chosen uart
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 76 pinmap_pinout(tx, PinMap_UART_TX);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 77 pinmap_pinout(rx, PinMap_UART_RX);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 78
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 79 // set rx/tx pins in PullUp mode
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 80 if (tx != NC) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 81 pin_mode(tx, PullUp);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 82 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 83 if (rx != NC) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 84 pin_mode(rx, PullUp);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 85 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 86
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 87 obj->uart->C2 |= (UART_C2_RE_MASK | UART_C2_TE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 88
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 89 if (uart == STDIO_UART) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 90 stdio_uart_inited = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 91 memcpy(&stdio_uart, obj, sizeof(serial_t));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 92 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 93 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 94
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 95 void serial_free(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 96 serial_irq_ids[obj->index] = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 97 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 98
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 99 void serial_baud(serial_t *obj, int baudrate) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 100 // save C2 state
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 101 uint8_t c2_state = (obj->uart->C2 & (UART_C2_RE_MASK | UART_C2_TE_MASK));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 102
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 103 // Disable UART before changing registers
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 104 obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 105
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 106 uint32_t PCLK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 107 if (obj->uart != UART2) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 108 PCLK = mcgpllfll_frequency();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 109 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 110 else {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 111 PCLK = bus_frequency();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 112 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 113
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 114 uint16_t DL = PCLK / (16 * baudrate);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 115 uint32_t BRFA = (2 * PCLK) / baudrate - 32 * DL;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 116
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 117 // set BDH and BDL
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 118 obj->uart->BDH = (obj->uart->BDH & ~(0x1f)) | ((DL >> 8) & 0x1f);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 119 obj->uart->BDL = (obj->uart->BDL & ~(0xff)) | ((DL >> 0) & 0xff);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 120
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 121 obj->uart->C4 &= ~0x1F;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 122 obj->uart->C4 |= BRFA & 0x1F;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 123
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 124 // restore C2 state
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 125 obj->uart->C2 |= c2_state;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 126 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 127
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 128 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 129 MBED_ASSERT((stop_bits == 1) || (stop_bits == 2));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 130 MBED_ASSERT((parity == ParityNone) || (parity == ParityOdd) || (parity == ParityEven));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 131 MBED_ASSERT((data_bits == 8) || (data_bits == 9));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 132
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 133 // save C2 state
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 134 uint32_t c2_state = (obj->uart->C2 & (UART_C2_RE_MASK | UART_C2_TE_MASK));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 135
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 136 // Disable UART before changing registers
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 137 obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 138
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 139 // 8 data bits = 0 ... 9 data bits = 1
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 140 data_bits -= 8;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 141
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 142 uint32_t parity_enable, parity_select;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 143 switch (parity) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 144 case ParityNone:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 145 parity_enable = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 146 parity_select = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 147 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 148 case ParityOdd :
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 149 parity_enable = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 150 parity_select = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 151 data_bits++;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 152 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 153 case ParityEven:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 154 parity_enable = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 155 parity_select = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 156 data_bits++;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 157 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 158 default:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 159 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 160 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 161
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 162 stop_bits -= 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 163
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 164 uint32_t m10 = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 165
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 166 // 9 data bits + parity - only uart0 support
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 167 if (data_bits == 2) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 168 MBED_ASSERT(obj->index == 0);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 169 data_bits = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 170 m10 = 1;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 171 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 172
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 173 // data bits, parity and parity mode
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 174 obj->uart->C1 = ((data_bits << 4)
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 175 | (parity_enable << 1)
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 176 | (parity_select << 0));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 177
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 178 //enable 10bit mode if needed
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 179 if (obj->index == 0) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 180 obj->uart->C4 &= ~UART_C4_M10_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 181 obj->uart->C4 |= (m10 << UART_C4_M10_SHIFT);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 182 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 183
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 184 // stop bits
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 185 obj->uart->BDH &= ~UART_BDH_SBR_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 186 obj->uart->BDH |= (stop_bits << UART_BDH_SBR_SHIFT);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 187
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 188 // restore C2 state
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 189 obj->uart->C2 |= c2_state;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 190 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 191
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 192 /******************************************************************************
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 193 * INTERRUPTS HANDLING
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 194 ******************************************************************************/
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 195 static inline void uart_irq(uint8_t status, uint32_t index) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 196 if (serial_irq_ids[index] != 0) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 197 if (status & UART_S1_TDRE_MASK)
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 198 irq_handler(serial_irq_ids[index], TxIrq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 199
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 200 if (status & UART_S1_RDRF_MASK)
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 201 irq_handler(serial_irq_ids[index], RxIrq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 202 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 203 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 204
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 205 void uart0_irq() {uart_irq(UART0->S1, 0);}
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 206 void uart1_irq() {uart_irq(UART1->S1, 1);}
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 207 void uart2_irq() {uart_irq(UART2->S1, 2);}
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 208
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 209 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 210 irq_handler = handler;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 211 serial_irq_ids[obj->index] = id;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 212 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 213
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 214 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 215 IRQn_Type irq_n = (IRQn_Type)0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 216 uint32_t vector = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 217 switch ((int)obj->uart) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 218 case UART_0:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 219 irq_n=UART0_RX_TX_IRQn;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 220 vector = (uint32_t)&uart0_irq;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 221 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 222 case UART_1:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 223 irq_n=UART1_RX_TX_IRQn;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 224 vector = (uint32_t)&uart1_irq;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 225 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 226 case UART_2:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 227 irq_n=UART2_RX_TX_IRQn;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 228 vector = (uint32_t)&uart2_irq;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 229 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 230 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 231
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 232 if (enable) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 233 switch (irq) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 234 case RxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 235 obj->uart->C2 |= (UART_C2_RIE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 236 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 237 case TxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 238 obj->uart->C2 |= (UART_C2_TIE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 239 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 240 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 241 NVIC_SetVector(irq_n, vector);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 242 NVIC_EnableIRQ(irq_n);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 243
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 244 } else { // disable
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 245 int all_disabled = 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 246 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 247 switch (irq) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 248 case RxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 249 obj->uart->C2 &= ~(UART_C2_RIE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 250 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 251 case TxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 252 obj->uart->C2 &= ~(UART_C2_TIE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 253 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 254 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 255 switch (other_irq) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 256 case RxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 257 all_disabled = (obj->uart->C2 & (UART_C2_RIE_MASK)) == 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 258 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 259 case TxIrq:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 260 all_disabled = (obj->uart->C2 & (UART_C2_TIE_MASK)) == 0;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 261 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 262 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 263 if (all_disabled)
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 264 NVIC_DisableIRQ(irq_n);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 265 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 266 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 267
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 268 int serial_getc(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 269 while (!serial_readable(obj));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 270 return obj->uart->D;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 271 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 272
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 273 void serial_putc(serial_t *obj, int c) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 274 while (!serial_writable(obj));
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 275 obj->uart->D = c;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 276 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 277
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 278 int serial_readable(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 279
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 280 return (obj->uart->S1 & UART_S1_RDRF_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 281 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 282
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 283 int serial_writable(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 284
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 285 return (obj->uart->S1 & UART_S1_TDRE_MASK);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 286 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 287
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 288 void serial_clear(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 289 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 290
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 291 void serial_pinout_tx(PinName tx) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 292 pinmap_pinout(tx, PinMap_UART_TX);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 293 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 294
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 295 void serial_break_set(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 296 obj->uart->C2 |= UART_C2_SBK_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 297 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 298
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 299 void serial_break_clear(serial_t *obj) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 300 obj->uart->C2 &= ~UART_C2_SBK_MASK;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 301 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 302