Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC43XX/spi_api.c@256:76fd9a263045, 2014-07-15 (annotated)

Committer:
mbed_official
Date:
Tue Jul 15 07:45:08 2014 +0100
Revision:
256:76fd9a263045
Parent:
251:de9a1e4ffd79
Child:
284:bf0f62a62bf4
Synchronized with git revision 2031512f69c228e1d13ea89c39409db813af949f



Full URL: https://github.com/mbedmicro/mbed/commit/2031512f69c228e1d13ea89c39409db813af949f/



[LPC4330] Updated LPC4330_M4 port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 *
bogdanm 20:4263a77256ae 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
bogdanm 20:4263a77256ae 17 */
mbed_official 227:7bd0639b8911 18 #include "mbed_assert.h"
bogdanm 20:4263a77256ae 19 #include <math.h>
bogdanm 20:4263a77256ae 20
bogdanm 20:4263a77256ae 21 #include "spi_api.h"
bogdanm 20:4263a77256ae 22 #include "cmsis.h"
bogdanm 20:4263a77256ae 23 #include "pinmap.h"
mbed_official 251:de9a1e4ffd79 24 #include "error.h"
bogdanm 20:4263a77256ae 25
bogdanm 20:4263a77256ae 26 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 256:76fd9a263045 27 {P1_19, SPI_1, (SCU_PINIO_FAST | 1)},
mbed_official 256:76fd9a263045 28 {P3_0, SPI_0, (SCU_PINIO_FAST | 4)},
mbed_official 256:76fd9a263045 29 {P3_3, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 30 {PF_0, SPI_0, (SCU_PINIO_FAST | 0)},
mbed_official 256:76fd9a263045 31 {PF_4, SPI_1, (SCU_PINIO_FAST | 0)},
mbed_official 256:76fd9a263045 32 {NC, NC, 0}
bogdanm 20:4263a77256ae 33 };
bogdanm 20:4263a77256ae 34
bogdanm 20:4263a77256ae 35 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 256:76fd9a263045 36 {P0_1, SPI_1, (SCU_PINIO_FAST | 1)},
mbed_official 256:76fd9a263045 37 {P1_2, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 38 {P1_4, SPI_1, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 39 {P3_7, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 40 {P3_8, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 41 {P9_2, SPI_0, (SCU_PINIO_FAST | 7)},
mbed_official 256:76fd9a263045 42 {PF_3, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 43 {PF_7, SPI_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 44 {NC, NC, 0}
bogdanm 20:4263a77256ae 45 };
bogdanm 20:4263a77256ae 46
bogdanm 20:4263a77256ae 47 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 256:76fd9a263045 48 {P0_0, SPI_1, (SCU_PINIO_FAST | 1)},
mbed_official 256:76fd9a263045 49 {P1_1, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 50 {P1_3, SPI_1, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 51 {P3_6, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 52 {P3_7, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 53 {P9_1, SPI_0, (SCU_PINIO_FAST | 7)},
mbed_official 256:76fd9a263045 54 {PF_2, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 55 {PF_6, SPI_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 56 {NC, NC, 0}
bogdanm 20:4263a77256ae 57 };
bogdanm 20:4263a77256ae 58
bogdanm 20:4263a77256ae 59 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 256:76fd9a263045 60 {P1_0, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 61 {P1_5, SPI_1, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 62 {P1_20, SPI_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 63 {P3_6, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 64 {P3_8, SPI_0, (SCU_PINIO_FAST | 5)},
mbed_official 256:76fd9a263045 65 {P9_0, SPI_0, (SCU_PINIO_FAST | 7)},
mbed_official 256:76fd9a263045 66 {PF_1, SPI_0, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 67 {PF_5, SPI_1, (SCU_PINIO_FAST | 2)},
mbed_official 256:76fd9a263045 68 {NC, NC, 0}
bogdanm 20:4263a77256ae 69 };
bogdanm 20:4263a77256ae 70
bogdanm 20:4263a77256ae 71 static inline int ssp_disable(spi_t *obj);
bogdanm 20:4263a77256ae 72 static inline int ssp_enable(spi_t *obj);
bogdanm 20:4263a77256ae 73
bogdanm 20:4263a77256ae 74 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
bogdanm 20:4263a77256ae 75 // determine the SPI to use
bogdanm 20:4263a77256ae 76 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 20:4263a77256ae 77 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 20:4263a77256ae 78 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 20:4263a77256ae 79 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 20:4263a77256ae 80 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 20:4263a77256ae 81 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 20:4263a77256ae 82
bogdanm 20:4263a77256ae 83 obj->spi = (LPC_SSP_T*)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 84 MBED_ASSERT((int)obj->spi != NC);
bogdanm 20:4263a77256ae 85
bogdanm 20:4263a77256ae 86 // set default format and frequency
bogdanm 20:4263a77256ae 87 if (ssel == NC) {
bogdanm 20:4263a77256ae 88 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
bogdanm 20:4263a77256ae 89 } else {
bogdanm 20:4263a77256ae 90 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
bogdanm 20:4263a77256ae 91 }
bogdanm 20:4263a77256ae 92 spi_frequency(obj, 1000000);
bogdanm 20:4263a77256ae 93
bogdanm 20:4263a77256ae 94 // enable the ssp channel
bogdanm 20:4263a77256ae 95 ssp_enable(obj);
bogdanm 20:4263a77256ae 96
bogdanm 20:4263a77256ae 97 // pin out the spi pins
bogdanm 20:4263a77256ae 98 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 20:4263a77256ae 99 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 20:4263a77256ae 100 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 20:4263a77256ae 101 if (ssel != NC) {
bogdanm 20:4263a77256ae 102 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 20:4263a77256ae 103 }
bogdanm 20:4263a77256ae 104 }
bogdanm 20:4263a77256ae 105
bogdanm 20:4263a77256ae 106 void spi_free(spi_t *obj) {}
bogdanm 20:4263a77256ae 107
bogdanm 20:4263a77256ae 108 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 227:7bd0639b8911 109 MBED_ASSERT(((bits >= 4) && (bits <= 16)) || ((mode >= 0) && (mode <= 3)));
bogdanm 20:4263a77256ae 110 ssp_disable(obj);
bogdanm 20:4263a77256ae 111
bogdanm 20:4263a77256ae 112 int polarity = (mode & 0x2) ? 1 : 0;
bogdanm 20:4263a77256ae 113 int phase = (mode & 0x1) ? 1 : 0;
bogdanm 20:4263a77256ae 114
bogdanm 20:4263a77256ae 115 // set it up
bogdanm 20:4263a77256ae 116 int DSS = bits - 1; // DSS (data select size)
bogdanm 20:4263a77256ae 117 int SPO = (polarity) ? 1 : 0; // SPO - clock out polarity
bogdanm 20:4263a77256ae 118 int SPH = (phase) ? 1 : 0; // SPH - clock out phase
bogdanm 20:4263a77256ae 119
bogdanm 20:4263a77256ae 120 int FRF = 0; // FRF (frame format) = SPI
bogdanm 20:4263a77256ae 121 uint32_t tmp = obj->spi->CR0;
bogdanm 20:4263a77256ae 122 tmp &= ~(0xFFFF);
bogdanm 20:4263a77256ae 123 tmp |= DSS << 0
bogdanm 20:4263a77256ae 124 | FRF << 4
bogdanm 20:4263a77256ae 125 | SPO << 6
bogdanm 20:4263a77256ae 126 | SPH << 7;
bogdanm 20:4263a77256ae 127 obj->spi->CR0 = tmp;
bogdanm 20:4263a77256ae 128
bogdanm 20:4263a77256ae 129 tmp = obj->spi->CR1;
bogdanm 20:4263a77256ae 130 tmp &= ~(0xD);
bogdanm 20:4263a77256ae 131 tmp |= 0 << 0 // LBM - loop back mode - off
bogdanm 20:4263a77256ae 132 | ((slave) ? 1 : 0) << 2 // MS - master slave mode, 1 = slave
bogdanm 20:4263a77256ae 133 | 0 << 3; // SOD - slave output disable - na
bogdanm 20:4263a77256ae 134 obj->spi->CR1 = tmp;
bogdanm 20:4263a77256ae 135 ssp_enable(obj);
bogdanm 20:4263a77256ae 136 }
bogdanm 20:4263a77256ae 137
bogdanm 20:4263a77256ae 138 void spi_frequency(spi_t *obj, int hz) {
bogdanm 20:4263a77256ae 139 ssp_disable(obj);
bogdanm 20:4263a77256ae 140
bogdanm 20:4263a77256ae 141 uint32_t PCLK = SystemCoreClock;
bogdanm 20:4263a77256ae 142
bogdanm 20:4263a77256ae 143 int prescaler;
bogdanm 20:4263a77256ae 144
bogdanm 20:4263a77256ae 145 for (prescaler = 2; prescaler <= 254; prescaler += 2) {
bogdanm 20:4263a77256ae 146 int prescale_hz = PCLK / prescaler;
bogdanm 20:4263a77256ae 147
bogdanm 20:4263a77256ae 148 // calculate the divider
bogdanm 20:4263a77256ae 149 int divider = floor(((float)prescale_hz / (float)hz) + 0.5f);
bogdanm 20:4263a77256ae 150
bogdanm 20:4263a77256ae 151 // check we can support the divider
bogdanm 20:4263a77256ae 152 if (divider < 256) {
bogdanm 20:4263a77256ae 153 // prescaler
bogdanm 20:4263a77256ae 154 obj->spi->CPSR = prescaler;
bogdanm 20:4263a77256ae 155
bogdanm 20:4263a77256ae 156 // divider
bogdanm 20:4263a77256ae 157 obj->spi->CR0 &= ~(0xFFFF << 8);
bogdanm 20:4263a77256ae 158 obj->spi->CR0 |= (divider - 1) << 8;
bogdanm 20:4263a77256ae 159 ssp_enable(obj);
bogdanm 20:4263a77256ae 160 return;
bogdanm 20:4263a77256ae 161 }
bogdanm 20:4263a77256ae 162 }
bogdanm 20:4263a77256ae 163 error("Couldn't setup requested SPI frequency");
bogdanm 20:4263a77256ae 164 }
bogdanm 20:4263a77256ae 165
bogdanm 20:4263a77256ae 166 static inline int ssp_disable(spi_t *obj) {
bogdanm 20:4263a77256ae 167 return obj->spi->CR1 &= ~(1 << 1);
bogdanm 20:4263a77256ae 168 }
bogdanm 20:4263a77256ae 169
bogdanm 20:4263a77256ae 170 static inline int ssp_enable(spi_t *obj) {
bogdanm 20:4263a77256ae 171 return obj->spi->CR1 |= (1 << 1);
bogdanm 20:4263a77256ae 172 }
bogdanm 20:4263a77256ae 173
bogdanm 20:4263a77256ae 174 static inline int ssp_readable(spi_t *obj) {
bogdanm 20:4263a77256ae 175 return obj->spi->SR & (1 << 2);
bogdanm 20:4263a77256ae 176 }
bogdanm 20:4263a77256ae 177
bogdanm 20:4263a77256ae 178 static inline int ssp_writeable(spi_t *obj) {
bogdanm 20:4263a77256ae 179 return obj->spi->SR & (1 << 1);
bogdanm 20:4263a77256ae 180 }
bogdanm 20:4263a77256ae 181
bogdanm 20:4263a77256ae 182 static inline void ssp_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 183 while (!ssp_writeable(obj));
bogdanm 20:4263a77256ae 184 obj->spi->DR = value;
bogdanm 20:4263a77256ae 185 }
bogdanm 20:4263a77256ae 186
bogdanm 20:4263a77256ae 187 static inline int ssp_read(spi_t *obj) {
bogdanm 20:4263a77256ae 188 while (!ssp_readable(obj));
bogdanm 20:4263a77256ae 189 return obj->spi->DR;
bogdanm 20:4263a77256ae 190 }
bogdanm 20:4263a77256ae 191
bogdanm 20:4263a77256ae 192 static inline int ssp_busy(spi_t *obj) {
bogdanm 20:4263a77256ae 193 return (obj->spi->SR & (1 << 4)) ? (1) : (0);
bogdanm 20:4263a77256ae 194 }
bogdanm 20:4263a77256ae 195
bogdanm 20:4263a77256ae 196 int spi_master_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 197 ssp_write(obj, value);
bogdanm 20:4263a77256ae 198 return ssp_read(obj);
bogdanm 20:4263a77256ae 199 }
bogdanm 20:4263a77256ae 200
bogdanm 20:4263a77256ae 201 int spi_slave_receive(spi_t *obj) {
bogdanm 20:4263a77256ae 202 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 81:a9456fdf72fa 203 }
bogdanm 20:4263a77256ae 204
bogdanm 20:4263a77256ae 205 int spi_slave_read(spi_t *obj) {
bogdanm 20:4263a77256ae 206 return obj->spi->DR;
bogdanm 20:4263a77256ae 207 }
bogdanm 20:4263a77256ae 208
bogdanm 20:4263a77256ae 209 void spi_slave_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 210 while (ssp_writeable(obj) == 0) ;
bogdanm 20:4263a77256ae 211 obj->spi->DR = value;
bogdanm 20:4263a77256ae 212 }
bogdanm 20:4263a77256ae 213
bogdanm 20:4263a77256ae 214 int spi_busy(spi_t *obj) {
bogdanm 20:4263a77256ae 215 return ssp_busy(obj);
bogdanm 20:4263a77256ae 216 }