Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/spi_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
71:a5b1c83f05dc
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) 2006-2013 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 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 17 #include <math.h>
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "spi_api.h"
bogdanm 0:9b334a45a8ff 20 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 21 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 22 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 23 #include "RZ_A1_Init.h"
bogdanm 0:9b334a45a8ff 24
bogdanm 0:9b334a45a8ff 25 static const PinMap PinMap_SPI_SCLK[] = {
bogdanm 0:9b334a45a8ff 26 {P10_12, SPI_0, 4},
bogdanm 0:9b334a45a8ff 27 {P4_4 , SPI_1, 2},
bogdanm 0:9b334a45a8ff 28 {P11_12, SPI_1, 2},
bogdanm 0:9b334a45a8ff 29 {P8_3 , SPI_2, 3},
bogdanm 0:9b334a45a8ff 30 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 31 };
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 static const PinMap PinMap_SPI_SSEL[] = {
bogdanm 0:9b334a45a8ff 34 {P10_13, SPI_0, 4},
bogdanm 0:9b334a45a8ff 35 {P4_5 , SPI_1, 2},
bogdanm 0:9b334a45a8ff 36 {P11_13, SPI_1, 2},
bogdanm 0:9b334a45a8ff 37 {P8_4 , SPI_2, 3},
bogdanm 0:9b334a45a8ff 38 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 39 };
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 static const PinMap PinMap_SPI_MOSI[] = {
bogdanm 0:9b334a45a8ff 42 {P10_14, SPI_0, 4},
bogdanm 0:9b334a45a8ff 43 {P4_6 , SPI_1, 2},
bogdanm 0:9b334a45a8ff 44 {P11_14, SPI_1, 2},
bogdanm 0:9b334a45a8ff 45 {P8_5 , SPI_2, 3},
bogdanm 0:9b334a45a8ff 46 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 47 };
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 static const PinMap PinMap_SPI_MISO[] = {
bogdanm 0:9b334a45a8ff 50 {P10_15, SPI_0, 4},
bogdanm 0:9b334a45a8ff 51 {P4_7 , SPI_1, 2},
bogdanm 0:9b334a45a8ff 52 {P11_15, SPI_1, 2},
bogdanm 0:9b334a45a8ff 53 {P8_6 , SPI_2, 3},
bogdanm 0:9b334a45a8ff 54 {NC , NC , 0}
bogdanm 0:9b334a45a8ff 55 };
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 static const struct st_rspi *RSPI[] = RSPI_ADDRESS_LIST;
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 static inline void spi_disable(spi_t *obj);
bogdanm 0:9b334a45a8ff 60 static inline void spi_enable(spi_t *obj);
bogdanm 0:9b334a45a8ff 61 static inline int spi_readable(spi_t *obj);
bogdanm 0:9b334a45a8ff 62 static inline void spi_write(spi_t *obj, int value);
bogdanm 0:9b334a45a8ff 63 static inline int spi_read(spi_t *obj);
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
bogdanm 0:9b334a45a8ff 66 // determine the SPI to use
bogdanm 0:9b334a45a8ff 67 volatile uint8_t dummy;
bogdanm 0:9b334a45a8ff 68 uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 69 uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 70 uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 71 uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 72 uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
bogdanm 0:9b334a45a8ff 73 uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel);
bogdanm 0:9b334a45a8ff 74 uint32_t spi = pinmap_merge(spi_data, spi_cntl);
bogdanm 0:9b334a45a8ff 75
bogdanm 0:9b334a45a8ff 76 MBED_ASSERT((int)spi != NC);
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78 obj->spi = (struct st_rspi *)RSPI[spi];
bogdanm 0:9b334a45a8ff 79
bogdanm 0:9b334a45a8ff 80 // enable power and clocking
bogdanm 0:9b334a45a8ff 81 switch (spi) {
bogdanm 0:9b334a45a8ff 82 case SPI_0: CPGSTBCR10 &= ~(0x80); break;
bogdanm 0:9b334a45a8ff 83 case SPI_1: CPGSTBCR10 &= ~(0x40); break;
bogdanm 0:9b334a45a8ff 84 case SPI_2: CPGSTBCR10 &= ~(0x20); break;
bogdanm 0:9b334a45a8ff 85 }
bogdanm 0:9b334a45a8ff 86 dummy = CPGSTBCR10;
bogdanm 0:9b334a45a8ff 87
bogdanm 0:9b334a45a8ff 88 obj->spi->SPCR = 0x00; // CTRL to 0
bogdanm 0:9b334a45a8ff 89 obj->spi->SPSCR = 0x00; // no sequential operation
bogdanm 0:9b334a45a8ff 90 obj->spi->SSLP = 0x00; // SSL 'L' active
bogdanm 0:9b334a45a8ff 91 obj->spi->SPDCR = 0x20; // byte access
bogdanm 0:9b334a45a8ff 92 obj->spi->SPCKD = 0x00; // SSL -> enable CLK delay : 1RSPCK
bogdanm 0:9b334a45a8ff 93 obj->spi->SSLND = 0x00; // CLK end -> SSL neg delay : 1RSPCK
bogdanm 0:9b334a45a8ff 94 obj->spi->SPND = 0x00; // delay between CMD : 1RSPCK + 2P1CLK
bogdanm 0:9b334a45a8ff 95 obj->spi->SPPCR = 0x20; // MOSI Idle fixed value equals 0
bogdanm 0:9b334a45a8ff 96 obj->spi->SPBFCR = 0xf0; // and set trigger count: read 1, write 1
bogdanm 0:9b334a45a8ff 97 obj->spi->SPBFCR = 0x30; // and reset buffer
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 // pin out the spi pins
bogdanm 0:9b334a45a8ff 100 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 101 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 102 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 103 if ((int)ssel != NC) {
bogdanm 0:9b334a45a8ff 104 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 105 }
bogdanm 0:9b334a45a8ff 106 }
bogdanm 0:9b334a45a8ff 107
bogdanm 0:9b334a45a8ff 108 void spi_free(spi_t *obj) {}
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 void spi_format(spi_t *obj, int bits, int mode, int slave) {
bogdanm 0:9b334a45a8ff 111 int DSS; // DSS (data select size)
bogdanm 0:9b334a45a8ff 112 int polarity = (mode & 0x2) ? 1 : 0;
bogdanm 0:9b334a45a8ff 113 int phase = (mode & 0x1) ? 1 : 0;
bogdanm 0:9b334a45a8ff 114 uint16_t tmp = 0;
bogdanm 0:9b334a45a8ff 115 uint16_t mask = 0xf03;
bogdanm 0:9b334a45a8ff 116 uint16_t wk_spcmd0;
bogdanm 0:9b334a45a8ff 117 uint8_t splw;
bogdanm 0:9b334a45a8ff 118
bogdanm 0:9b334a45a8ff 119 switch (mode) {
bogdanm 0:9b334a45a8ff 120 case 0:
bogdanm 0:9b334a45a8ff 121 case 1:
bogdanm 0:9b334a45a8ff 122 case 2:
bogdanm 0:9b334a45a8ff 123 case 3:
bogdanm 0:9b334a45a8ff 124 // Do Nothing
bogdanm 0:9b334a45a8ff 125 break;
bogdanm 0:9b334a45a8ff 126 default:
bogdanm 0:9b334a45a8ff 127 error("SPI format error");
bogdanm 0:9b334a45a8ff 128 return;
bogdanm 0:9b334a45a8ff 129 }
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 switch (bits) {
bogdanm 0:9b334a45a8ff 132 case 8:
bogdanm 0:9b334a45a8ff 133 DSS = 0x7;
bogdanm 0:9b334a45a8ff 134 splw = 0x20;
bogdanm 0:9b334a45a8ff 135 break;
bogdanm 0:9b334a45a8ff 136 case 16:
bogdanm 0:9b334a45a8ff 137 DSS = 0xf;
bogdanm 0:9b334a45a8ff 138 splw = 0x40;
bogdanm 0:9b334a45a8ff 139 break;
bogdanm 0:9b334a45a8ff 140 case 32:
bogdanm 0:9b334a45a8ff 141 DSS = 0x2;
bogdanm 0:9b334a45a8ff 142 splw = 0x60;
bogdanm 0:9b334a45a8ff 143 break;
bogdanm 0:9b334a45a8ff 144 default:
bogdanm 0:9b334a45a8ff 145 error("SPI module don't support other than 8/16/32bits");
bogdanm 0:9b334a45a8ff 146 return;
bogdanm 0:9b334a45a8ff 147 }
bogdanm 0:9b334a45a8ff 148 tmp |= phase;
bogdanm 0:9b334a45a8ff 149 tmp |= (polarity << 1);
bogdanm 0:9b334a45a8ff 150 tmp |= (DSS << 8);
bogdanm 0:9b334a45a8ff 151 obj->bits = bits;
bogdanm 0:9b334a45a8ff 152
bogdanm 0:9b334a45a8ff 153 spi_disable(obj);
bogdanm 0:9b334a45a8ff 154 wk_spcmd0 = obj->spi->SPCMD0;
bogdanm 0:9b334a45a8ff 155 wk_spcmd0 &= ~mask;
bogdanm 0:9b334a45a8ff 156 wk_spcmd0 |= (mask & tmp);
bogdanm 0:9b334a45a8ff 157 obj->spi->SPCMD0 = wk_spcmd0;
bogdanm 0:9b334a45a8ff 158 obj->spi->SPDCR = splw;
bogdanm 0:9b334a45a8ff 159 if (slave) {
bogdanm 0:9b334a45a8ff 160 obj->spi->SPCR &=~(1 << 3); // MSTR to 0
bogdanm 0:9b334a45a8ff 161 } else {
bogdanm 0:9b334a45a8ff 162 obj->spi->SPCR |= (1 << 3); // MSTR to 1
bogdanm 0:9b334a45a8ff 163 }
bogdanm 0:9b334a45a8ff 164 spi_enable(obj);
bogdanm 0:9b334a45a8ff 165 }
bogdanm 0:9b334a45a8ff 166
bogdanm 0:9b334a45a8ff 167 void spi_frequency(spi_t *obj, int hz) {
bogdanm 0:9b334a45a8ff 168 uint32_t pclk_base;
bogdanm 0:9b334a45a8ff 169 uint32_t div;
bogdanm 0:9b334a45a8ff 170 uint32_t brdv = 0;
bogdanm 0:9b334a45a8ff 171 uint32_t hz_max;
bogdanm 0:9b334a45a8ff 172 uint32_t hz_min;
bogdanm 0:9b334a45a8ff 173 uint16_t mask = 0x000c;
bogdanm 0:9b334a45a8ff 174 uint16_t wk_spcmd0;
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 /* set PCLK */
bogdanm 0:9b334a45a8ff 177 if (RZ_A1_IsClockMode0() == false) {
bogdanm 0:9b334a45a8ff 178 pclk_base = CM1_RENESAS_RZ_A1_P1_CLK;
bogdanm 0:9b334a45a8ff 179 } else {
bogdanm 0:9b334a45a8ff 180 pclk_base = CM0_RENESAS_RZ_A1_P1_CLK;
bogdanm 0:9b334a45a8ff 181 }
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 hz_min = pclk_base / 2 / 256 / 8;
bogdanm 0:9b334a45a8ff 184 hz_max = pclk_base / 2;
bogdanm 0:9b334a45a8ff 185 if ((hz < hz_min) || (hz > hz_max)) {
bogdanm 0:9b334a45a8ff 186 error("Couldn't setup requested SPI frequency");
bogdanm 0:9b334a45a8ff 187 return;
bogdanm 0:9b334a45a8ff 188 }
bogdanm 0:9b334a45a8ff 189
bogdanm 0:9b334a45a8ff 190 div = (pclk_base / hz / 2);
bogdanm 0:9b334a45a8ff 191 while (div > 256) {
bogdanm 0:9b334a45a8ff 192 div >>= 1;
bogdanm 0:9b334a45a8ff 193 brdv++;
bogdanm 0:9b334a45a8ff 194 }
bogdanm 0:9b334a45a8ff 195 div -= 1;
bogdanm 0:9b334a45a8ff 196 brdv = (brdv << 2);
bogdanm 0:9b334a45a8ff 197
bogdanm 0:9b334a45a8ff 198 spi_disable(obj);
bogdanm 0:9b334a45a8ff 199 obj->spi->SPBR = div;
bogdanm 0:9b334a45a8ff 200 wk_spcmd0 = obj->spi->SPCMD0;
bogdanm 0:9b334a45a8ff 201 wk_spcmd0 &= ~mask;
bogdanm 0:9b334a45a8ff 202 wk_spcmd0 |= (mask & brdv);
bogdanm 0:9b334a45a8ff 203 obj->spi->SPCMD0 = wk_spcmd0;
bogdanm 0:9b334a45a8ff 204 spi_enable(obj);
bogdanm 0:9b334a45a8ff 205 }
bogdanm 0:9b334a45a8ff 206
bogdanm 0:9b334a45a8ff 207 static inline void spi_disable(spi_t *obj) {
bogdanm 0:9b334a45a8ff 208 obj->spi->SPCR &= ~(1 << 6); // SPE to 0
bogdanm 0:9b334a45a8ff 209 }
bogdanm 0:9b334a45a8ff 210
bogdanm 0:9b334a45a8ff 211 static inline void spi_enable(spi_t *obj) {
bogdanm 0:9b334a45a8ff 212 obj->spi->SPCR |= (1 << 6); // SPE to 1
bogdanm 0:9b334a45a8ff 213 }
bogdanm 0:9b334a45a8ff 214
bogdanm 0:9b334a45a8ff 215 static inline int spi_readable(spi_t *obj) {
bogdanm 0:9b334a45a8ff 216 return obj->spi->SPSR & (1 << 7); // SPRF
bogdanm 0:9b334a45a8ff 217 }
bogdanm 0:9b334a45a8ff 218
bogdanm 0:9b334a45a8ff 219 static inline int spi_tend(spi_t *obj) {
bogdanm 0:9b334a45a8ff 220 return obj->spi->SPSR & (1 << 6); // TEND
bogdanm 0:9b334a45a8ff 221 }
bogdanm 0:9b334a45a8ff 222
bogdanm 0:9b334a45a8ff 223 static inline void spi_write(spi_t *obj, int value) {
bogdanm 0:9b334a45a8ff 224 if (obj->bits == 8) {
bogdanm 0:9b334a45a8ff 225 obj->spi->SPDR.UINT8[0] = (uint8_t)value;
bogdanm 0:9b334a45a8ff 226 } else if (obj->bits == 16) {
bogdanm 0:9b334a45a8ff 227 obj->spi->SPDR.UINT16[0] = (uint16_t)value;
bogdanm 0:9b334a45a8ff 228 } else {
bogdanm 0:9b334a45a8ff 229 obj->spi->SPDR.UINT32 = (uint32_t)value;
bogdanm 0:9b334a45a8ff 230 }
bogdanm 0:9b334a45a8ff 231 }
bogdanm 0:9b334a45a8ff 232
bogdanm 0:9b334a45a8ff 233 static inline int spi_read(spi_t *obj) {
bogdanm 0:9b334a45a8ff 234 int read_data;
bogdanm 0:9b334a45a8ff 235
bogdanm 0:9b334a45a8ff 236 if (obj->bits == 8) {
bogdanm 0:9b334a45a8ff 237 read_data = obj->spi->SPDR.UINT8[0];
bogdanm 0:9b334a45a8ff 238 } else if (obj->bits == 16) {
bogdanm 0:9b334a45a8ff 239 read_data = obj->spi->SPDR.UINT16[0];
bogdanm 0:9b334a45a8ff 240 } else {
bogdanm 0:9b334a45a8ff 241 read_data = obj->spi->SPDR.UINT32;
bogdanm 0:9b334a45a8ff 242 }
bogdanm 0:9b334a45a8ff 243
bogdanm 0:9b334a45a8ff 244 return read_data;
bogdanm 0:9b334a45a8ff 245 }
bogdanm 0:9b334a45a8ff 246
bogdanm 0:9b334a45a8ff 247 int spi_master_write(spi_t *obj, int value) {
bogdanm 0:9b334a45a8ff 248 spi_write(obj, value);
bogdanm 0:9b334a45a8ff 249 while(!spi_tend(obj));
bogdanm 0:9b334a45a8ff 250 return spi_read(obj);
bogdanm 0:9b334a45a8ff 251 }
bogdanm 0:9b334a45a8ff 252
bogdanm 0:9b334a45a8ff 253 int spi_slave_receive(spi_t *obj) {
bogdanm 0:9b334a45a8ff 254 return (spi_readable(obj) && !spi_busy(obj)) ? (1) : (0);
bogdanm 0:9b334a45a8ff 255 }
bogdanm 0:9b334a45a8ff 256
bogdanm 0:9b334a45a8ff 257 int spi_slave_read(spi_t *obj) {
bogdanm 0:9b334a45a8ff 258 return spi_read(obj);
bogdanm 0:9b334a45a8ff 259 }
bogdanm 0:9b334a45a8ff 260
bogdanm 0:9b334a45a8ff 261 void spi_slave_write(spi_t *obj, int value) {
bogdanm 0:9b334a45a8ff 262 spi_write(obj, value);
bogdanm 0:9b334a45a8ff 263 }
bogdanm 0:9b334a45a8ff 264
bogdanm 0:9b334a45a8ff 265 int spi_busy(spi_t *obj) {
bogdanm 0:9b334a45a8ff 266 return 0;
bogdanm 0:9b334a45a8ff 267 }