Amit Gandhi / sensen_copy_2

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targets/hal/TARGET_ARM_SSG/TARGET_MPS2/serial_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
80:bdf1132a57cf
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2015 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 // math.h required for floating point operations for baud rate calculation
bogdanm 0:9b334a45a8ff 17 #include <math.h>
bogdanm 0:9b334a45a8ff 18 #include <stdio.h>
bogdanm 0:9b334a45a8ff 19 #include <string.h>
bogdanm 0:9b334a45a8ff 20 #include <stdlib.h>
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 #include "serial_api.h"
bogdanm 0:9b334a45a8ff 23 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 24 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 25 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 26 #include "gpio_api.h"
bogdanm 0:9b334a45a8ff 27
bogdanm 0:9b334a45a8ff 28 /******************************************************************************
bogdanm 0:9b334a45a8ff 29 * INITIALIZATION
bogdanm 0:9b334a45a8ff 30 ******************************************************************************/
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 static const PinMap PinMap_UART_TX[] = {
bogdanm 0:9b334a45a8ff 33 {USBTX , UART_0, 0},
bogdanm 0:9b334a45a8ff 34 {UART_TX1, UART_1, 0},
bogdanm 0:9b334a45a8ff 35 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 36 };
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 static const PinMap PinMap_UART_RX[] = {
bogdanm 0:9b334a45a8ff 39 {USBRX , UART_0, 0},
bogdanm 0:9b334a45a8ff 40 {UART_RX1, UART_1, 0},
bogdanm 0:9b334a45a8ff 41 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 42 };
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 #define UART_NUM 3
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 static uart_irq_handler irq_handler;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 int stdio_uart_inited = 0;
bogdanm 0:9b334a45a8ff 49 serial_t stdio_uart;
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 struct serial_global_data_s {
bogdanm 0:9b334a45a8ff 52 uint32_t serial_irq_id;
bogdanm 0:9b334a45a8ff 53 gpio_t sw_rts, sw_cts;
bogdanm 0:9b334a45a8ff 54 uint8_t count, rx_irq_set_flow, rx_irq_set_api;
bogdanm 0:9b334a45a8ff 55 };
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 static struct serial_global_data_s uart_data[UART_NUM];
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 void serial_init(serial_t *obj, PinName tx, PinName rx) {
bogdanm 0:9b334a45a8ff 60 int is_stdio_uart = 0;
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 // determine the UART to use
bogdanm 0:9b334a45a8ff 63 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
bogdanm 0:9b334a45a8ff 64 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
bogdanm 0:9b334a45a8ff 65 UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
bogdanm 0:9b334a45a8ff 66 if ((int)uart == NC) {
bogdanm 0:9b334a45a8ff 67 error("Serial pinout mapping failed");
bogdanm 0:9b334a45a8ff 68 }
bogdanm 0:9b334a45a8ff 69
bogdanm 0:9b334a45a8ff 70 obj->uart = (CMSDK_UART_TypeDef *)uart;
bogdanm 0:9b334a45a8ff 71 //set baud rate and enable Uart in normarl mode (RX and TX enabled)
bogdanm 0:9b334a45a8ff 72 switch (uart) {
bogdanm 0:9b334a45a8ff 73 case UART_0: CMSDK_UART0->CTRL = 0; // Disable UART when changing configuration
bogdanm 0:9b334a45a8ff 74 CMSDK_UART0->CTRL = 0x3; // Normal mode
bogdanm 0:9b334a45a8ff 75 break;
bogdanm 0:9b334a45a8ff 76 case UART_1: CMSDK_UART1->CTRL = 0; // Disable UART when changing configuration
bogdanm 0:9b334a45a8ff 77 CMSDK_UART1->CTRL = 0x3; // Normal mode
bogdanm 0:9b334a45a8ff 78 break;
bogdanm 0:9b334a45a8ff 79 }
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 // set default baud rate and format
bogdanm 0:9b334a45a8ff 82 serial_baud (obj, 9600);
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 // pinout the chosen uart
bogdanm 0:9b334a45a8ff 85 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 0:9b334a45a8ff 86 pinmap_pinout(rx, PinMap_UART_RX);
bogdanm 0:9b334a45a8ff 87
bogdanm 0:9b334a45a8ff 88 switch (uart) {
bogdanm 0:9b334a45a8ff 89 case UART_0: obj->index = 0; break;
bogdanm 0:9b334a45a8ff 90 case UART_1: obj->index = 1; break;
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92 uart_data[obj->index].sw_rts.pin = NC;
bogdanm 0:9b334a45a8ff 93 uart_data[obj->index].sw_cts.pin = NC;
bogdanm 0:9b334a45a8ff 94 serial_set_flow_control(obj, FlowControlNone, NC, NC);
bogdanm 0:9b334a45a8ff 95
bogdanm 0:9b334a45a8ff 96 is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
bogdanm 0:9b334a45a8ff 97
bogdanm 0:9b334a45a8ff 98 if (is_stdio_uart) {
bogdanm 0:9b334a45a8ff 99 stdio_uart_inited = 1;
bogdanm 0:9b334a45a8ff 100 memcpy(&stdio_uart, obj, sizeof(serial_t));
bogdanm 0:9b334a45a8ff 101 }
bogdanm 0:9b334a45a8ff 102 }
bogdanm 0:9b334a45a8ff 103
bogdanm 0:9b334a45a8ff 104 void serial_free(serial_t *obj) {
bogdanm 0:9b334a45a8ff 105 }
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 // serial_baud
bogdanm 0:9b334a45a8ff 108 // set the baud rate, taking in to account the current SystemFrequency
bogdanm 0:9b334a45a8ff 109 void serial_baud(serial_t *obj, int baudrate) {
bogdanm 0:9b334a45a8ff 110 // The MPS2 has a simple divider to control the baud rate. The formula is:
bogdanm 0:9b334a45a8ff 111 //
bogdanm 0:9b334a45a8ff 112 // Baudrate = PCLK / BAUDDIV
bogdanm 0:9b334a45a8ff 113 //
bogdanm 0:9b334a45a8ff 114 // PCLK = 25 Mhz
bogdanm 0:9b334a45a8ff 115 // so for a desired baud rate of 9600
bogdanm 0:9b334a45a8ff 116 // 25000000 / 9600 = 2604
bogdanm 0:9b334a45a8ff 117 //
bogdanm 0:9b334a45a8ff 118 //check to see if minimum baud value entered
bogdanm 0:9b334a45a8ff 119 int baudrate_div = 0;
bogdanm 0:9b334a45a8ff 120 baudrate_div = 25000000 / baudrate;
bogdanm 0:9b334a45a8ff 121 if(baudrate >= 16){
bogdanm 0:9b334a45a8ff 122 switch ((int)obj->uart) {
bogdanm 0:9b334a45a8ff 123 case UART_0: CMSDK_UART0->BAUDDIV = baudrate_div; break;
bogdanm 0:9b334a45a8ff 124 case UART_1: CMSDK_UART1->BAUDDIV = baudrate_div; break;
bogdanm 0:9b334a45a8ff 125 default: error("serial_baud"); break;
bogdanm 0:9b334a45a8ff 126 }
bogdanm 0:9b334a45a8ff 127 } else {
bogdanm 0:9b334a45a8ff 128 error("serial_baud");
bogdanm 0:9b334a45a8ff 129 }
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 }
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
bogdanm 0:9b334a45a8ff 134 }
bogdanm 0:9b334a45a8ff 135
bogdanm 0:9b334a45a8ff 136 /******************************************************************************
bogdanm 0:9b334a45a8ff 137 * INTERRUPTS HANDLING
bogdanm 0:9b334a45a8ff 138 ******************************************************************************/
bogdanm 0:9b334a45a8ff 139 static inline void uart_irq(uint32_t intstatus, uint32_t index, CMSDK_UART_TypeDef *puart) {
bogdanm 0:9b334a45a8ff 140 SerialIrq irq_type;
bogdanm 0:9b334a45a8ff 141 switch (intstatus) {
bogdanm 0:9b334a45a8ff 142 case 1: irq_type = TxIrq; break;
bogdanm 0:9b334a45a8ff 143 case 2: irq_type = RxIrq; break;
bogdanm 0:9b334a45a8ff 144 default: return;
bogdanm 0:9b334a45a8ff 145 }
bogdanm 0:9b334a45a8ff 146 if ((RxIrq == irq_type) && (NC != uart_data[index].sw_rts.pin)) {
bogdanm 0:9b334a45a8ff 147 gpio_write(&uart_data[index].sw_rts, 1);
bogdanm 0:9b334a45a8ff 148 // Disable interrupt if it wasn't enabled by other part of the application
bogdanm 0:9b334a45a8ff 149 if (!uart_data[index].rx_irq_set_api)
bogdanm 0:9b334a45a8ff 150 puart->CTRL &= ~(1 << RxIrq);
bogdanm 0:9b334a45a8ff 151 }
bogdanm 0:9b334a45a8ff 152 if (uart_data[index].serial_irq_id != 0)
bogdanm 0:9b334a45a8ff 153 if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api))
bogdanm 0:9b334a45a8ff 154 irq_handler(uart_data[index].serial_irq_id, irq_type);
bogdanm 0:9b334a45a8ff 155 }
bogdanm 0:9b334a45a8ff 156
bogdanm 0:9b334a45a8ff 157 void uart0_irq() {uart_irq(CMSDK_UART0->INTSTATUS & 0x3, 0, (CMSDK_UART_TypeDef*)CMSDK_UART0);}
bogdanm 0:9b334a45a8ff 158 void uart1_irq() {uart_irq(CMSDK_UART1->INTSTATUS & 0x3, 1, (CMSDK_UART_TypeDef*)CMSDK_UART1);}
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
bogdanm 0:9b334a45a8ff 161 irq_handler = handler;
bogdanm 0:9b334a45a8ff 162 uart_data[obj->index].serial_irq_id = id;
bogdanm 0:9b334a45a8ff 163 }
bogdanm 0:9b334a45a8ff 164
bogdanm 0:9b334a45a8ff 165 static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) {
bogdanm 0:9b334a45a8ff 166 IRQn_Type irq_n = (IRQn_Type)0;
bogdanm 0:9b334a45a8ff 167 uint32_t vector = 0;
bogdanm 0:9b334a45a8ff 168 switch ((int)obj->uart) {
bogdanm 0:9b334a45a8ff 169 case UART_0: irq_n=((irq>> 2) ? UARTRX0_IRQn : UARTTX0_IRQn); vector = (uint32_t)&uart0_irq; break;
bogdanm 0:9b334a45a8ff 170 case UART_1: irq_n=((irq>> 2) ? UARTRX1_IRQn : UARTTX1_IRQn); vector = (uint32_t)&uart1_irq; break;
bogdanm 0:9b334a45a8ff 171 }
bogdanm 0:9b334a45a8ff 172
bogdanm 0:9b334a45a8ff 173 if (enable) {
bogdanm 0:9b334a45a8ff 174 obj->uart->CTRL |= 1 << irq;
bogdanm 0:9b334a45a8ff 175 NVIC_SetVector(irq_n, vector);
bogdanm 0:9b334a45a8ff 176 NVIC_EnableIRQ(irq_n);
bogdanm 0:9b334a45a8ff 177 } else if ((TxIrq == irq) || (uart_data[obj->index].rx_irq_set_api + uart_data[obj->index].rx_irq_set_flow == 0)) { // disable
bogdanm 0:9b334a45a8ff 178 int all_disabled = 0;
bogdanm 0:9b334a45a8ff 179 SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
bogdanm 0:9b334a45a8ff 180 obj->uart->CTRL &= ~(1 << irq);
bogdanm 0:9b334a45a8ff 181 all_disabled = (obj->uart->CTRL & (1 << other_irq)) == 0;
bogdanm 0:9b334a45a8ff 182 if (all_disabled)
bogdanm 0:9b334a45a8ff 183 NVIC_DisableIRQ(irq_n);
bogdanm 0:9b334a45a8ff 184 }
bogdanm 0:9b334a45a8ff 185 }
bogdanm 0:9b334a45a8ff 186
bogdanm 0:9b334a45a8ff 187 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
bogdanm 0:9b334a45a8ff 188 if (RxIrq == irq)
bogdanm 0:9b334a45a8ff 189 uart_data[obj->index].rx_irq_set_api = enable;
bogdanm 0:9b334a45a8ff 190 serial_irq_set_internal(obj, irq, enable);
bogdanm 0:9b334a45a8ff 191 }
bogdanm 0:9b334a45a8ff 192
bogdanm 0:9b334a45a8ff 193 /******************************************************************************
bogdanm 0:9b334a45a8ff 194 * READ/WRITE
bogdanm 0:9b334a45a8ff 195 ******************************************************************************/
bogdanm 0:9b334a45a8ff 196 int serial_getc(serial_t *obj) {
bogdanm 0:9b334a45a8ff 197 while (serial_readable(obj) == 0);
bogdanm 0:9b334a45a8ff 198 int data = obj->uart->DATA;
bogdanm 0:9b334a45a8ff 199 return data;
bogdanm 0:9b334a45a8ff 200 }
bogdanm 0:9b334a45a8ff 201
bogdanm 0:9b334a45a8ff 202 void serial_putc(serial_t *obj, int c) {
bogdanm 0:9b334a45a8ff 203 while (serial_writable(obj));
bogdanm 0:9b334a45a8ff 204 obj->uart->DATA = c;
bogdanm 0:9b334a45a8ff 205 }
bogdanm 0:9b334a45a8ff 206
bogdanm 0:9b334a45a8ff 207 int serial_readable(serial_t *obj) {
bogdanm 0:9b334a45a8ff 208 return obj->uart->STATE & 2;
bogdanm 0:9b334a45a8ff 209 }
bogdanm 0:9b334a45a8ff 210
bogdanm 0:9b334a45a8ff 211 int serial_writable(serial_t *obj) {
bogdanm 0:9b334a45a8ff 212 return obj->uart->STATE & 1;
bogdanm 0:9b334a45a8ff 213 }
bogdanm 0:9b334a45a8ff 214
bogdanm 0:9b334a45a8ff 215 void serial_clear(serial_t *obj) {
bogdanm 0:9b334a45a8ff 216 obj->uart->DATA = 0x00;
bogdanm 0:9b334a45a8ff 217 }
bogdanm 0:9b334a45a8ff 218
bogdanm 0:9b334a45a8ff 219 void serial_pinout_tx(PinName tx) {
bogdanm 0:9b334a45a8ff 220 pinmap_pinout(tx, PinMap_UART_TX);
bogdanm 0:9b334a45a8ff 221 }
bogdanm 0:9b334a45a8ff 222
bogdanm 0:9b334a45a8ff 223 void serial_break_set(serial_t *obj) {
bogdanm 0:9b334a45a8ff 224 }
bogdanm 0:9b334a45a8ff 225
bogdanm 0:9b334a45a8ff 226 void serial_break_clear(serial_t *obj) {
bogdanm 0:9b334a45a8ff 227 }
bogdanm 0:9b334a45a8ff 228 void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) {
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230