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targets/hal/TARGET_NXP/TARGET_LPC43XX/spi_api.c@636:2405a6d45c2c, 2016-05-23 (annotated)

Committer:
dconsoli
Date:
Mon May 23 02:17:28 2016 +0000
Revision:
636:2405a6d45c2c
Parent:
552:a1b9575155a3 
I don't know;

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 285:31249416b6f9 24 #include "mbed_error.h"
bogdanm 20:4263a77256ae 25
mbed_official 283:bf0f62a62bf4 26 // SCU mode for SPI pins
mbed_official 283:bf0f62a62bf4 27 #define SCU_PINIO_SPI SCU_PINIO_FAST
mbed_official 283:bf0f62a62bf4 28
bogdanm 20:4263a77256ae 29 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 283:bf0f62a62bf4 30 {P1_19, SPI_1, (SCU_PINIO_SPI | 1)},
mbed_official 283:bf0f62a62bf4 31 {P3_0, SPI_0, (SCU_PINIO_SPI | 4)},
mbed_official 283:bf0f62a62bf4 32 {P3_3, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 33 {PF_0, SPI_0, (SCU_PINIO_SPI | 0)},
mbed_official 283:bf0f62a62bf4 34 {PF_4, SPI_1, (SCU_PINIO_SPI | 0)},
mbed_official 256:76fd9a263045 35 {NC, NC, 0}
bogdanm 20:4263a77256ae 36 };
bogdanm 20:4263a77256ae 37
bogdanm 20:4263a77256ae 38 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 283:bf0f62a62bf4 39 {P0_1, SPI_1, (SCU_PINIO_SPI | 1)},
mbed_official 283:bf0f62a62bf4 40 {P1_2, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 41 {P1_4, SPI_1, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 42 {P3_7, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 43 {P3_8, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 44 {P9_2, SPI_0, (SCU_PINIO_SPI | 7)},
mbed_official 283:bf0f62a62bf4 45 {PF_3, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 46 {PF_7, SPI_1, (SCU_PINIO_SPI | 2)},
mbed_official 256:76fd9a263045 47 {NC, NC, 0}
bogdanm 20:4263a77256ae 48 };
bogdanm 20:4263a77256ae 49
bogdanm 20:4263a77256ae 50 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 283:bf0f62a62bf4 51 {P0_0, SPI_1, (SCU_PINIO_SPI | 1)},
mbed_official 283:bf0f62a62bf4 52 {P1_1, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 53 {P1_3, SPI_1, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 54 {P3_6, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 55 {P3_7, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 56 {P9_1, SPI_0, (SCU_PINIO_SPI | 7)},
mbed_official 283:bf0f62a62bf4 57 {PF_2, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 58 {PF_6, SPI_1, (SCU_PINIO_SPI | 2)},
mbed_official 256:76fd9a263045 59 {NC, NC, 0}
bogdanm 20:4263a77256ae 60 };
bogdanm 20:4263a77256ae 61
bogdanm 20:4263a77256ae 62 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 283:bf0f62a62bf4 63 {P1_0, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 64 {P1_5, SPI_1, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 65 {P1_20, SPI_1, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 66 {P3_6, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 67 {P3_8, SPI_0, (SCU_PINIO_SPI | 5)},
mbed_official 283:bf0f62a62bf4 68 {P9_0, SPI_0, (SCU_PINIO_SPI | 7)},
mbed_official 283:bf0f62a62bf4 69 {PF_1, SPI_0, (SCU_PINIO_SPI | 2)},
mbed_official 283:bf0f62a62bf4 70 {PF_5, SPI_1, (SCU_PINIO_SPI | 2)},
mbed_official 256:76fd9a263045 71 {NC, NC, 0}
bogdanm 20:4263a77256ae 72 };
bogdanm 20:4263a77256ae 73
bogdanm 20:4263a77256ae 74 static inline int ssp_disable(spi_t *obj);
bogdanm 20:4263a77256ae 75 static inline int ssp_enable(spi_t *obj);
bogdanm 20:4263a77256ae 76
bogdanm 20:4263a77256ae 77 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
bogdanm 20:4263a77256ae 78 // determine the SPI to use
bogdanm 20:4263a77256ae 79 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 20:4263a77256ae 80 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 20:4263a77256ae 81 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 20:4263a77256ae 82 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 20:4263a77256ae 83 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 20:4263a77256ae 84 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 20:4263a77256ae 85
bogdanm 20:4263a77256ae 86 obj->spi = (LPC_SSP_T*)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 87 MBED_ASSERT((int)obj->spi != NC);
mbed_official 283:bf0f62a62bf4 88
mbed_official 283:bf0f62a62bf4 89 // enable clocking
mbed_official 283:bf0f62a62bf4 90 switch ((int)obj->spi) {
mbed_official 283:bf0f62a62bf4 91 case SPI_0: LPC_CGU->BASE_CLK[CLK_BASE_SSP0] = (1 << 11) | (CLKIN_MAINPLL << 24); break;
mbed_official 283:bf0f62a62bf4 92 case SPI_1: LPC_CGU->BASE_CLK[CLK_BASE_SSP1] = (1 << 11) | (CLKIN_MAINPLL << 24); break;
mbed_official 283:bf0f62a62bf4 93 }
bogdanm 20:4263a77256ae 94
bogdanm 20:4263a77256ae 95 // pin out the spi pins
bogdanm 20:4263a77256ae 96 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 20:4263a77256ae 97 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 20:4263a77256ae 98 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 20:4263a77256ae 99 if (ssel != NC) {
bogdanm 20:4263a77256ae 100 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 20:4263a77256ae 101 }
bogdanm 20:4263a77256ae 102 }
bogdanm 20:4263a77256ae 103
bogdanm 20:4263a77256ae 104 void spi_free(spi_t *obj) {}
bogdanm 20:4263a77256ae 105
bogdanm 20:4263a77256ae 106 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 227:7bd0639b8911 107 MBED_ASSERT(((bits >= 4) && (bits <= 16)) || ((mode >= 0) && (mode <= 3)));
bogdanm 20:4263a77256ae 108 ssp_disable(obj);
bogdanm 20:4263a77256ae 109
bogdanm 20:4263a77256ae 110 int polarity = (mode & 0x2) ? 1 : 0;
bogdanm 20:4263a77256ae 111 int phase = (mode & 0x1) ? 1 : 0;
bogdanm 20:4263a77256ae 112
bogdanm 20:4263a77256ae 113 // set it up
bogdanm 20:4263a77256ae 114 int DSS = bits - 1; // DSS (data select size)
bogdanm 20:4263a77256ae 115 int SPO = (polarity) ? 1 : 0; // SPO - clock out polarity
bogdanm 20:4263a77256ae 116 int SPH = (phase) ? 1 : 0; // SPH - clock out phase
bogdanm 20:4263a77256ae 117
bogdanm 20:4263a77256ae 118 int FRF = 0; // FRF (frame format) = SPI
bogdanm 20:4263a77256ae 119 uint32_t tmp = obj->spi->CR0;
bogdanm 20:4263a77256ae 120 tmp &= ~(0xFFFF);
bogdanm 20:4263a77256ae 121 tmp |= DSS << 0
bogdanm 20:4263a77256ae 122 | FRF << 4
bogdanm 20:4263a77256ae 123 | SPO << 6
bogdanm 20:4263a77256ae 124 | SPH << 7;
bogdanm 20:4263a77256ae 125 obj->spi->CR0 = tmp;
bogdanm 20:4263a77256ae 126
bogdanm 20:4263a77256ae 127 tmp = obj->spi->CR1;
bogdanm 20:4263a77256ae 128 tmp &= ~(0xD);
bogdanm 20:4263a77256ae 129 tmp |= 0 << 0 // LBM - loop back mode - off
bogdanm 20:4263a77256ae 130 | ((slave) ? 1 : 0) << 2 // MS - master slave mode, 1 = slave
bogdanm 20:4263a77256ae 131 | 0 << 3; // SOD - slave output disable - na
bogdanm 20:4263a77256ae 132 obj->spi->CR1 = tmp;
bogdanm 20:4263a77256ae 133 ssp_enable(obj);
bogdanm 20:4263a77256ae 134 }
bogdanm 20:4263a77256ae 135
bogdanm 20:4263a77256ae 136 void spi_frequency(spi_t *obj, int hz) {
bogdanm 20:4263a77256ae 137 ssp_disable(obj);
bogdanm 20:4263a77256ae 138
bogdanm 20:4263a77256ae 139 uint32_t PCLK = SystemCoreClock;
bogdanm 20:4263a77256ae 140
bogdanm 20:4263a77256ae 141 int prescaler;
bogdanm 20:4263a77256ae 142
bogdanm 20:4263a77256ae 143 for (prescaler = 2; prescaler <= 254; prescaler += 2) {
bogdanm 20:4263a77256ae 144 int prescale_hz = PCLK / prescaler;
bogdanm 20:4263a77256ae 145
bogdanm 20:4263a77256ae 146 // calculate the divider
bogdanm 20:4263a77256ae 147 int divider = floor(((float)prescale_hz / (float)hz) + 0.5f);
bogdanm 20:4263a77256ae 148
bogdanm 20:4263a77256ae 149 // check we can support the divider
bogdanm 20:4263a77256ae 150 if (divider < 256) {
bogdanm 20:4263a77256ae 151 // prescaler
bogdanm 20:4263a77256ae 152 obj->spi->CPSR = prescaler;
bogdanm 20:4263a77256ae 153
bogdanm 20:4263a77256ae 154 // divider
bogdanm 20:4263a77256ae 155 obj->spi->CR0 &= ~(0xFFFF << 8);
bogdanm 20:4263a77256ae 156 obj->spi->CR0 |= (divider - 1) << 8;
bogdanm 20:4263a77256ae 157 ssp_enable(obj);
bogdanm 20:4263a77256ae 158 return;
bogdanm 20:4263a77256ae 159 }
bogdanm 20:4263a77256ae 160 }
bogdanm 20:4263a77256ae 161 error("Couldn't setup requested SPI frequency");
bogdanm 20:4263a77256ae 162 }
bogdanm 20:4263a77256ae 163
bogdanm 20:4263a77256ae 164 static inline int ssp_disable(spi_t *obj) {
bogdanm 20:4263a77256ae 165 return obj->spi->CR1 &= ~(1 << 1);
bogdanm 20:4263a77256ae 166 }
bogdanm 20:4263a77256ae 167
bogdanm 20:4263a77256ae 168 static inline int ssp_enable(spi_t *obj) {
bogdanm 20:4263a77256ae 169 return obj->spi->CR1 |= (1 << 1);
bogdanm 20:4263a77256ae 170 }
bogdanm 20:4263a77256ae 171
bogdanm 20:4263a77256ae 172 static inline int ssp_readable(spi_t *obj) {
bogdanm 20:4263a77256ae 173 return obj->spi->SR & (1 << 2);
bogdanm 20:4263a77256ae 174 }
bogdanm 20:4263a77256ae 175
bogdanm 20:4263a77256ae 176 static inline int ssp_writeable(spi_t *obj) {
bogdanm 20:4263a77256ae 177 return obj->spi->SR & (1 << 1);
bogdanm 20:4263a77256ae 178 }
bogdanm 20:4263a77256ae 179
bogdanm 20:4263a77256ae 180 static inline void ssp_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 181 while (!ssp_writeable(obj));
bogdanm 20:4263a77256ae 182 obj->spi->DR = value;
bogdanm 20:4263a77256ae 183 }
bogdanm 20:4263a77256ae 184
bogdanm 20:4263a77256ae 185 static inline int ssp_read(spi_t *obj) {
bogdanm 20:4263a77256ae 186 while (!ssp_readable(obj));
bogdanm 20:4263a77256ae 187 return obj->spi->DR;
bogdanm 20:4263a77256ae 188 }
bogdanm 20:4263a77256ae 189
bogdanm 20:4263a77256ae 190 static inline int ssp_busy(spi_t *obj) {
bogdanm 20:4263a77256ae 191 return (obj->spi->SR & (1 << 4)) ? (1) : (0);
bogdanm 20:4263a77256ae 192 }
bogdanm 20:4263a77256ae 193
bogdanm 20:4263a77256ae 194 int spi_master_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 195 ssp_write(obj, value);
bogdanm 20:4263a77256ae 196 return ssp_read(obj);
bogdanm 20:4263a77256ae 197 }
bogdanm 20:4263a77256ae 198
bogdanm 20:4263a77256ae 199 int spi_slave_receive(spi_t *obj) {
bogdanm 20:4263a77256ae 200 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 81:a9456fdf72fa 201 }
bogdanm 20:4263a77256ae 202
bogdanm 20:4263a77256ae 203 int spi_slave_read(spi_t *obj) {
bogdanm 20:4263a77256ae 204 return obj->spi->DR;
bogdanm 20:4263a77256ae 205 }
bogdanm 20:4263a77256ae 206
bogdanm 20:4263a77256ae 207 void spi_slave_write(spi_t *obj, int value) {
bogdanm 20:4263a77256ae 208 while (ssp_writeable(obj) == 0) ;
bogdanm 20:4263a77256ae 209 obj->spi->DR = value;
bogdanm 20:4263a77256ae 210 }
bogdanm 20:4263a77256ae 211
bogdanm 20:4263a77256ae 212 int spi_busy(spi_t *obj) {
bogdanm 20:4263a77256ae 213 return ssp_busy(obj);
bogdanm 20:4263a77256ae 214 }