Zakaria ElQotbi / mbed-src

mbed library sources for airmote

Fork of mbed-src by mbed official

targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL26Z/spi_api.c@585:a1ed5b41f74f, 2015-07-08 (annotated)

Committer:
mbed_official
Date:
Wed Jul 08 14:45:08 2015 +0100
Revision:
585:a1ed5b41f74f
Synchronized with git revision 7a2b57896e0263b82f31ddc5a0ad2443615db184



Full URL: https://github.com/mbedmicro/mbed/commit/7a2b57896e0263b82f31ddc5a0ad2443615db184/



Add rtc_api.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 585:a1ed5b41f74f 1 /* mbed Microcontroller Library
mbed_official 585:a1ed5b41f74f 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 585:a1ed5b41f74f 3 *
mbed_official 585:a1ed5b41f74f 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 585:a1ed5b41f74f 5 * you may not use this file except in compliance with the License.
mbed_official 585:a1ed5b41f74f 6 * You may obtain a copy of the License at
mbed_official 585:a1ed5b41f74f 7 *
mbed_official 585:a1ed5b41f74f 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 585:a1ed5b41f74f 9 *
mbed_official 585:a1ed5b41f74f 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 585:a1ed5b41f74f 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 585:a1ed5b41f74f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 585:a1ed5b41f74f 13 * See the License for the specific language governing permissions and
mbed_official 585:a1ed5b41f74f 14 * limitations under the License.
mbed_official 585:a1ed5b41f74f 15 */
mbed_official 585:a1ed5b41f74f 16 #include "mbed_assert.h"
mbed_official 585:a1ed5b41f74f 17 #include "spi_api.h"
mbed_official 585:a1ed5b41f74f 18
mbed_official 585:a1ed5b41f74f 19 #include <math.h>
mbed_official 585:a1ed5b41f74f 20
mbed_official 585:a1ed5b41f74f 21 #include "cmsis.h"
mbed_official 585:a1ed5b41f74f 22 #include "pinmap.h"
mbed_official 585:a1ed5b41f74f 23
mbed_official 585:a1ed5b41f74f 24 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 585:a1ed5b41f74f 25 {PTA15, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 26 {PTB9, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 27 {PTB11, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 28 {PTC5, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 29 {PTD1, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 30 {PTD5, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 31 {PTE2, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 32 {PTE17, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 33 {NC , NC , 0}
mbed_official 585:a1ed5b41f74f 34 };
mbed_official 585:a1ed5b41f74f 35
mbed_official 585:a1ed5b41f74f 36 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 585:a1ed5b41f74f 37 {PTA16, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 38 {PTA17, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 39 {PTB16, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 40 {PTB17, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 41 {PTC6, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 42 {PTC7, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 43 {PTD2, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 44 {PTD3, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 45 {PTD6, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 46 {PTD7, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 47 {PTE1, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 48 {PTE3, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 49 {PTE18, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 50 {PTE19, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 51 {NC , NC , 0}
mbed_official 585:a1ed5b41f74f 52 };
mbed_official 585:a1ed5b41f74f 53
mbed_official 585:a1ed5b41f74f 54 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 585:a1ed5b41f74f 55 {PTA16, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 56 {PTA17, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 57 {PTB16, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 58 {PTB17, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 59 {PTC6, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 60 {PTC7, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 61 {PTD2, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 62 {PTD3, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 63 {PTD6, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 64 {PTD7, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 65 {PTE1, SPI_1, 5},
mbed_official 585:a1ed5b41f74f 66 {PTE3, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 67 {PTE18, SPI_0, 5},
mbed_official 585:a1ed5b41f74f 68 {PTE19, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 69 {NC , NC , 0}
mbed_official 585:a1ed5b41f74f 70 };
mbed_official 585:a1ed5b41f74f 71
mbed_official 585:a1ed5b41f74f 72 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 585:a1ed5b41f74f 73 {PTA14, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 74 {PTB10, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 75 {PTC4, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 76 {PTD0, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 77 {PTD4, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 78 {PTE4, SPI_1, 2},
mbed_official 585:a1ed5b41f74f 79 {PTE16, SPI_0, 2},
mbed_official 585:a1ed5b41f74f 80 {NC , NC , 0}
mbed_official 585:a1ed5b41f74f 81 };
mbed_official 585:a1ed5b41f74f 82
mbed_official 585:a1ed5b41f74f 83 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 585:a1ed5b41f74f 84 // determine the SPI to use
mbed_official 585:a1ed5b41f74f 85 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 585:a1ed5b41f74f 86 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 585:a1ed5b41f74f 87 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 585:a1ed5b41f74f 88 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 585:a1ed5b41f74f 89 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 585:a1ed5b41f74f 90 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 585:a1ed5b41f74f 91
mbed_official 585:a1ed5b41f74f 92 obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl);
mbed_official 585:a1ed5b41f74f 93 MBED_ASSERT((int)obj->spi != NC);
mbed_official 585:a1ed5b41f74f 94
mbed_official 585:a1ed5b41f74f 95 // enable power and clocking
mbed_official 585:a1ed5b41f74f 96 switch ((int)obj->spi) {
mbed_official 585:a1ed5b41f74f 97 case SPI_0: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 22; break;
mbed_official 585:a1ed5b41f74f 98 case SPI_1: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 23; break;
mbed_official 585:a1ed5b41f74f 99 }
mbed_official 585:a1ed5b41f74f 100
mbed_official 585:a1ed5b41f74f 101 // enable SPI
mbed_official 585:a1ed5b41f74f 102 obj->spi->C1 |= SPI_C1_SPE_MASK;
mbed_official 585:a1ed5b41f74f 103 obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; //8bit
mbed_official 585:a1ed5b41f74f 104
mbed_official 585:a1ed5b41f74f 105 // pin out the spi pins
mbed_official 585:a1ed5b41f74f 106 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 585:a1ed5b41f74f 107 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 585:a1ed5b41f74f 108 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 585:a1ed5b41f74f 109 if (ssel != NC) {
mbed_official 585:a1ed5b41f74f 110 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 585:a1ed5b41f74f 111 }
mbed_official 585:a1ed5b41f74f 112 }
mbed_official 585:a1ed5b41f74f 113
mbed_official 585:a1ed5b41f74f 114 void spi_free(spi_t *obj) {
mbed_official 585:a1ed5b41f74f 115 // [TODO]
mbed_official 585:a1ed5b41f74f 116 }
mbed_official 585:a1ed5b41f74f 117 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 585:a1ed5b41f74f 118 MBED_ASSERT((bits == 8) || (bits == 16));
mbed_official 585:a1ed5b41f74f 119 MBED_ASSERT((mode >= 0) && (mode <= 3));
mbed_official 585:a1ed5b41f74f 120
mbed_official 585:a1ed5b41f74f 121 uint8_t polarity = (mode & 0x2) ? 1 : 0;
mbed_official 585:a1ed5b41f74f 122 uint8_t phase = (mode & 0x1) ? 1 : 0;
mbed_official 585:a1ed5b41f74f 123 uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2);
mbed_official 585:a1ed5b41f74f 124
mbed_official 585:a1ed5b41f74f 125 // clear MSTR, CPOL and CPHA bits
mbed_official 585:a1ed5b41f74f 126 obj->spi->C1 &= ~(0x7 << 2);
mbed_official 585:a1ed5b41f74f 127
mbed_official 585:a1ed5b41f74f 128 // write new value
mbed_official 585:a1ed5b41f74f 129 obj->spi->C1 |= c1_data;
mbed_official 585:a1ed5b41f74f 130 if (bits == 8) {
mbed_official 585:a1ed5b41f74f 131 obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK;
mbed_official 585:a1ed5b41f74f 132 } else {
mbed_official 585:a1ed5b41f74f 133 obj->spi->C2 |= SPI_C2_SPIMODE_MASK;
mbed_official 585:a1ed5b41f74f 134 }
mbed_official 585:a1ed5b41f74f 135 }
mbed_official 585:a1ed5b41f74f 136
mbed_official 585:a1ed5b41f74f 137 void spi_frequency(spi_t *obj, int hz) {
mbed_official 585:a1ed5b41f74f 138 uint32_t error = 0;
mbed_official 585:a1ed5b41f74f 139 uint32_t p_error = 0xffffffff;
mbed_official 585:a1ed5b41f74f 140 uint32_t ref = 0;
mbed_official 585:a1ed5b41f74f 141 uint8_t spr = 0;
mbed_official 585:a1ed5b41f74f 142 uint8_t ref_spr = 0;
mbed_official 585:a1ed5b41f74f 143 uint8_t ref_prescaler = 0;
mbed_official 585:a1ed5b41f74f 144
mbed_official 585:a1ed5b41f74f 145 // bus clk
mbed_official 585:a1ed5b41f74f 146 uint32_t PCLK = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1);
mbed_official 585:a1ed5b41f74f 147 uint8_t prescaler = 1;
mbed_official 585:a1ed5b41f74f 148 uint8_t divisor = 2;
mbed_official 585:a1ed5b41f74f 149
mbed_official 585:a1ed5b41f74f 150 for (prescaler = 1; prescaler <= 8; prescaler++) {
mbed_official 585:a1ed5b41f74f 151 divisor = 2;
mbed_official 585:a1ed5b41f74f 152 for (spr = 0; spr <= 8; spr++, divisor *= 2) {
mbed_official 585:a1ed5b41f74f 153 ref = PCLK / (prescaler*divisor);
mbed_official 585:a1ed5b41f74f 154 if (ref > (uint32_t)hz)
mbed_official 585:a1ed5b41f74f 155 continue;
mbed_official 585:a1ed5b41f74f 156 error = hz - ref;
mbed_official 585:a1ed5b41f74f 157 if (error < p_error) {
mbed_official 585:a1ed5b41f74f 158 ref_spr = spr;
mbed_official 585:a1ed5b41f74f 159 ref_prescaler = prescaler - 1;
mbed_official 585:a1ed5b41f74f 160 p_error = error;
mbed_official 585:a1ed5b41f74f 161 }
mbed_official 585:a1ed5b41f74f 162 }
mbed_official 585:a1ed5b41f74f 163 }
mbed_official 585:a1ed5b41f74f 164
mbed_official 585:a1ed5b41f74f 165 // set SPPR and SPR
mbed_official 585:a1ed5b41f74f 166 obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf);
mbed_official 585:a1ed5b41f74f 167 }
mbed_official 585:a1ed5b41f74f 168
mbed_official 585:a1ed5b41f74f 169 static inline int spi_writeable(spi_t * obj) {
mbed_official 585:a1ed5b41f74f 170 return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0;
mbed_official 585:a1ed5b41f74f 171 }
mbed_official 585:a1ed5b41f74f 172
mbed_official 585:a1ed5b41f74f 173 static inline int spi_readable(spi_t * obj) {
mbed_official 585:a1ed5b41f74f 174 return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0;
mbed_official 585:a1ed5b41f74f 175 }
mbed_official 585:a1ed5b41f74f 176
mbed_official 585:a1ed5b41f74f 177 int spi_master_write(spi_t *obj, int value) {
mbed_official 585:a1ed5b41f74f 178 int ret;
mbed_official 585:a1ed5b41f74f 179 if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) {
mbed_official 585:a1ed5b41f74f 180 // 16bit
mbed_official 585:a1ed5b41f74f 181 while(!spi_writeable(obj));
mbed_official 585:a1ed5b41f74f 182 obj->spi->DL = (value & 0xff);
mbed_official 585:a1ed5b41f74f 183 obj->spi->DH = ((value >> 8) & 0xff);
mbed_official 585:a1ed5b41f74f 184
mbed_official 585:a1ed5b41f74f 185 // wait rx buffer full
mbed_official 585:a1ed5b41f74f 186 while (!spi_readable(obj));
mbed_official 585:a1ed5b41f74f 187 ret = obj->spi->DH;
mbed_official 585:a1ed5b41f74f 188 ret = (ret << 8) | obj->spi->DL;
mbed_official 585:a1ed5b41f74f 189 } else {
mbed_official 585:a1ed5b41f74f 190 //8bit
mbed_official 585:a1ed5b41f74f 191 while(!spi_writeable(obj));
mbed_official 585:a1ed5b41f74f 192 obj->spi->DL = (value & 0xff);
mbed_official 585:a1ed5b41f74f 193
mbed_official 585:a1ed5b41f74f 194 // wait rx buffer full
mbed_official 585:a1ed5b41f74f 195 while (!spi_readable(obj));
mbed_official 585:a1ed5b41f74f 196 ret = (obj->spi->DL & 0xff);
mbed_official 585:a1ed5b41f74f 197 }
mbed_official 585:a1ed5b41f74f 198
mbed_official 585:a1ed5b41f74f 199 return ret;
mbed_official 585:a1ed5b41f74f 200 }
mbed_official 585:a1ed5b41f74f 201
mbed_official 585:a1ed5b41f74f 202 int spi_slave_receive(spi_t *obj) {
mbed_official 585:a1ed5b41f74f 203 return spi_readable(obj);
mbed_official 585:a1ed5b41f74f 204 }
mbed_official 585:a1ed5b41f74f 205
mbed_official 585:a1ed5b41f74f 206 int spi_slave_read(spi_t *obj) {
mbed_official 585:a1ed5b41f74f 207 int ret;
mbed_official 585:a1ed5b41f74f 208 if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) {
mbed_official 585:a1ed5b41f74f 209 ret = obj->spi->DH;
mbed_official 585:a1ed5b41f74f 210 ret = ((ret << 8) | obj->spi->DL);
mbed_official 585:a1ed5b41f74f 211 } else {
mbed_official 585:a1ed5b41f74f 212 ret = obj->spi->DL;
mbed_official 585:a1ed5b41f74f 213 }
mbed_official 585:a1ed5b41f74f 214 return ret;
mbed_official 585:a1ed5b41f74f 215 }
mbed_official 585:a1ed5b41f74f 216
mbed_official 585:a1ed5b41f74f 217 void spi_slave_write(spi_t *obj, int value) {
mbed_official 585:a1ed5b41f74f 218 while (!spi_writeable(obj));
mbed_official 585:a1ed5b41f74f 219 if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) {
mbed_official 585:a1ed5b41f74f 220 obj->spi->DL = (value & 0xff);
mbed_official 585:a1ed5b41f74f 221 obj->spi->DH = ((value >> 8) & 0xff);
mbed_official 585:a1ed5b41f74f 222 } else {
mbed_official 585:a1ed5b41f74f 223 obj->spi->DL = value;
mbed_official 585:a1ed5b41f74f 224 }
mbed_official 585:a1ed5b41f74f 225
mbed_official 585:a1ed5b41f74f 226 }