mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_Freescale/TARGET_KL46Z/spi_api.c@44:2ce89a25b635, 2013-11-05 (annotated)
- Committer:
- mbed_official
- Date:
- Tue Nov 05 21:45:05 2013 +0000
- Revision:
- 44:2ce89a25b635
- Parent:
- 33:e214068ab66c
- Child:
- 72:248c61396e08
Synchronized with git revision 887fd2ba3aa83c1c285196ff1cae1341a3e00bec
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 31:42176bc3c368 | 1 | /* mbed Microcontroller Library |
mbed_official | 31:42176bc3c368 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 31:42176bc3c368 | 3 | * |
mbed_official | 31:42176bc3c368 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 31:42176bc3c368 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 31:42176bc3c368 | 6 | * You may obtain a copy of the License at |
mbed_official | 31:42176bc3c368 | 7 | * |
mbed_official | 31:42176bc3c368 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 31:42176bc3c368 | 9 | * |
mbed_official | 31:42176bc3c368 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 31:42176bc3c368 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 31:42176bc3c368 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 31:42176bc3c368 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 31:42176bc3c368 | 14 | * limitations under the License. |
mbed_official | 31:42176bc3c368 | 15 | */ |
mbed_official | 31:42176bc3c368 | 16 | #include "spi_api.h" |
mbed_official | 31:42176bc3c368 | 17 | |
mbed_official | 31:42176bc3c368 | 18 | #include <math.h> |
mbed_official | 31:42176bc3c368 | 19 | |
mbed_official | 31:42176bc3c368 | 20 | #include "cmsis.h" |
mbed_official | 31:42176bc3c368 | 21 | #include "pinmap.h" |
mbed_official | 31:42176bc3c368 | 22 | #include "error.h" |
mbed_official | 31:42176bc3c368 | 23 | |
mbed_official | 31:42176bc3c368 | 24 | static const PinMap PinMap_SPI_SCLK[] = { |
mbed_official | 31:42176bc3c368 | 25 | {PTA15, SPI_0, 2}, |
mbed_official | 33:e214068ab66c | 26 | {PTB9, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 27 | {PTB11, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 28 | {PTC5, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 29 | {PTD1, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 30 | {PTD5, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 31 | {PTE2, SPI_1, 2}, |
mbed_official | 33:e214068ab66c | 32 | {PTE17, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 33 | {NC , NC , 0} |
mbed_official | 31:42176bc3c368 | 34 | }; |
mbed_official | 31:42176bc3c368 | 35 | |
mbed_official | 31:42176bc3c368 | 36 | static const PinMap PinMap_SPI_MOSI[] = { |
mbed_official | 31:42176bc3c368 | 37 | {PTA16, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 38 | {PTA17, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 39 | {PTB16, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 40 | {PTB17, SPI_1, 5}, |
mbed_official | 31:42176bc3c368 | 41 | {PTC6, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 42 | {PTC7, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 43 | {PTD2, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 44 | {PTD3, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 45 | {PTD6, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 46 | {PTD7, SPI_1, 5}, |
mbed_official | 31:42176bc3c368 | 47 | {PTE1, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 48 | {PTE3, SPI_1, 5}, |
mbed_official | 33:e214068ab66c | 49 | {PTE18, SPI_0, 2}, |
mbed_official | 33:e214068ab66c | 50 | {PTE19, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 51 | {NC , NC , 0} |
mbed_official | 31:42176bc3c368 | 52 | }; |
mbed_official | 31:42176bc3c368 | 53 | |
mbed_official | 31:42176bc3c368 | 54 | static const PinMap PinMap_SPI_MISO[] = { |
mbed_official | 31:42176bc3c368 | 55 | {PTA16, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 56 | {PTA17, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 57 | {PTB16, SPI_1, 5}, |
mbed_official | 31:42176bc3c368 | 58 | {PTB17, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 59 | {PTC6, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 60 | {PTC7, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 61 | {PTD2, SPI_0, 5}, |
mbed_official | 31:42176bc3c368 | 62 | {PTD3, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 63 | {PTD6, SPI_1, 5}, |
mbed_official | 31:42176bc3c368 | 64 | {PTD7, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 65 | {PTE1, SPI_1, 5}, |
mbed_official | 31:42176bc3c368 | 66 | {PTE3, SPI_1, 2}, |
mbed_official | 33:e214068ab66c | 67 | {PTE18, SPI_0, 5}, |
mbed_official | 33:e214068ab66c | 68 | {PTE19, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 69 | {NC , NC , 0} |
mbed_official | 31:42176bc3c368 | 70 | }; |
mbed_official | 31:42176bc3c368 | 71 | |
mbed_official | 31:42176bc3c368 | 72 | static const PinMap PinMap_SPI_SSEL[] = { |
mbed_official | 31:42176bc3c368 | 73 | {PTA14, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 74 | {PTB10, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 75 | {PTC4, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 76 | {PTD0, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 77 | {PTD4, SPI_1, 2}, |
mbed_official | 31:42176bc3c368 | 78 | {PTE4, SPI_1, 2}, |
mbed_official | 33:e214068ab66c | 79 | {PTE16, SPI_0, 2}, |
mbed_official | 31:42176bc3c368 | 80 | {NC , NC , 0} |
mbed_official | 31:42176bc3c368 | 81 | }; |
mbed_official | 31:42176bc3c368 | 82 | |
mbed_official | 31:42176bc3c368 | 83 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
mbed_official | 31:42176bc3c368 | 84 | // determine the SPI to use |
mbed_official | 31:42176bc3c368 | 85 | SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
mbed_official | 31:42176bc3c368 | 86 | SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); |
mbed_official | 31:42176bc3c368 | 87 | SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
mbed_official | 31:42176bc3c368 | 88 | SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
mbed_official | 31:42176bc3c368 | 89 | SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); |
mbed_official | 31:42176bc3c368 | 90 | SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); |
mbed_official | 31:42176bc3c368 | 91 | |
mbed_official | 31:42176bc3c368 | 92 | obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl); |
mbed_official | 31:42176bc3c368 | 93 | if ((int)obj->spi == NC) { |
mbed_official | 31:42176bc3c368 | 94 | error("SPI pinout mapping failed"); |
mbed_official | 31:42176bc3c368 | 95 | } |
mbed_official | 31:42176bc3c368 | 96 | |
mbed_official | 31:42176bc3c368 | 97 | // enable power and clocking |
mbed_official | 31:42176bc3c368 | 98 | switch ((int)obj->spi) { |
mbed_official | 44:2ce89a25b635 | 99 | case SPI_0: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 22; break; |
mbed_official | 31:42176bc3c368 | 100 | case SPI_1: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 23; break; |
mbed_official | 31:42176bc3c368 | 101 | } |
mbed_official | 31:42176bc3c368 | 102 | |
mbed_official | 31:42176bc3c368 | 103 | // set default format and frequency |
mbed_official | 31:42176bc3c368 | 104 | if (ssel == NC) { |
mbed_official | 31:42176bc3c368 | 105 | spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master |
mbed_official | 31:42176bc3c368 | 106 | } else { |
mbed_official | 31:42176bc3c368 | 107 | spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave |
mbed_official | 31:42176bc3c368 | 108 | } |
mbed_official | 31:42176bc3c368 | 109 | spi_frequency(obj, 1000000); |
mbed_official | 31:42176bc3c368 | 110 | |
mbed_official | 31:42176bc3c368 | 111 | // enable SPI |
mbed_official | 31:42176bc3c368 | 112 | obj->spi->C1 |= SPI_C1_SPE_MASK; |
mbed_official | 44:2ce89a25b635 | 113 | obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; //8bit |
mbed_official | 31:42176bc3c368 | 114 | |
mbed_official | 31:42176bc3c368 | 115 | // pin out the spi pins |
mbed_official | 31:42176bc3c368 | 116 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
mbed_official | 31:42176bc3c368 | 117 | pinmap_pinout(miso, PinMap_SPI_MISO); |
mbed_official | 31:42176bc3c368 | 118 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
mbed_official | 31:42176bc3c368 | 119 | if (ssel != NC) { |
mbed_official | 31:42176bc3c368 | 120 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
mbed_official | 31:42176bc3c368 | 121 | } |
mbed_official | 31:42176bc3c368 | 122 | } |
mbed_official | 31:42176bc3c368 | 123 | |
mbed_official | 31:42176bc3c368 | 124 | void spi_free(spi_t *obj) { |
mbed_official | 31:42176bc3c368 | 125 | // [TODO] |
mbed_official | 31:42176bc3c368 | 126 | } |
mbed_official | 31:42176bc3c368 | 127 | void spi_format(spi_t *obj, int bits, int mode, int slave) { |
mbed_official | 44:2ce89a25b635 | 128 | if ((bits != 8) && (bits != 16)) { |
mbed_official | 44:2ce89a25b635 | 129 | error("Only 8/16 bits SPI supported"); |
mbed_official | 31:42176bc3c368 | 130 | } |
mbed_official | 31:42176bc3c368 | 131 | |
mbed_official | 31:42176bc3c368 | 132 | if ((mode < 0) || (mode > 3)) { |
mbed_official | 31:42176bc3c368 | 133 | error("SPI mode unsupported"); |
mbed_official | 31:42176bc3c368 | 134 | } |
mbed_official | 31:42176bc3c368 | 135 | |
mbed_official | 31:42176bc3c368 | 136 | uint8_t polarity = (mode & 0x2) ? 1 : 0; |
mbed_official | 31:42176bc3c368 | 137 | uint8_t phase = (mode & 0x1) ? 1 : 0; |
mbed_official | 31:42176bc3c368 | 138 | uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2); |
mbed_official | 31:42176bc3c368 | 139 | |
mbed_official | 31:42176bc3c368 | 140 | // clear MSTR, CPOL and CPHA bits |
mbed_official | 31:42176bc3c368 | 141 | obj->spi->C1 &= ~(0x7 << 2); |
mbed_official | 31:42176bc3c368 | 142 | |
mbed_official | 31:42176bc3c368 | 143 | // write new value |
mbed_official | 31:42176bc3c368 | 144 | obj->spi->C1 |= c1_data; |
mbed_official | 44:2ce89a25b635 | 145 | if (bits == 8) { |
mbed_official | 44:2ce89a25b635 | 146 | obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; |
mbed_official | 44:2ce89a25b635 | 147 | } else { |
mbed_official | 44:2ce89a25b635 | 148 | obj->spi->C2 |= SPI_C2_SPIMODE_MASK; |
mbed_official | 44:2ce89a25b635 | 149 | } |
mbed_official | 31:42176bc3c368 | 150 | } |
mbed_official | 31:42176bc3c368 | 151 | |
mbed_official | 31:42176bc3c368 | 152 | void spi_frequency(spi_t *obj, int hz) { |
mbed_official | 31:42176bc3c368 | 153 | uint32_t error = 0; |
mbed_official | 31:42176bc3c368 | 154 | uint32_t p_error = 0xffffffff; |
mbed_official | 31:42176bc3c368 | 155 | uint32_t ref = 0; |
mbed_official | 31:42176bc3c368 | 156 | uint8_t spr = 0; |
mbed_official | 31:42176bc3c368 | 157 | uint8_t ref_spr = 0; |
mbed_official | 31:42176bc3c368 | 158 | uint8_t ref_prescaler = 0; |
mbed_official | 31:42176bc3c368 | 159 | |
mbed_official | 31:42176bc3c368 | 160 | // bus clk |
mbed_official | 31:42176bc3c368 | 161 | uint32_t PCLK = 48000000u; |
mbed_official | 31:42176bc3c368 | 162 | uint8_t prescaler = 1; |
mbed_official | 31:42176bc3c368 | 163 | uint8_t divisor = 2; |
mbed_official | 31:42176bc3c368 | 164 | |
mbed_official | 31:42176bc3c368 | 165 | for (prescaler = 1; prescaler <= 8; prescaler++) { |
mbed_official | 31:42176bc3c368 | 166 | divisor = 2; |
mbed_official | 31:42176bc3c368 | 167 | for (spr = 0; spr <= 8; spr++, divisor *= 2) { |
mbed_official | 31:42176bc3c368 | 168 | ref = PCLK / (prescaler*divisor); |
mbed_official | 31:42176bc3c368 | 169 | if (ref > (uint32_t)hz) |
mbed_official | 31:42176bc3c368 | 170 | continue; |
mbed_official | 31:42176bc3c368 | 171 | error = hz - ref; |
mbed_official | 31:42176bc3c368 | 172 | if (error < p_error) { |
mbed_official | 31:42176bc3c368 | 173 | ref_spr = spr; |
mbed_official | 31:42176bc3c368 | 174 | ref_prescaler = prescaler - 1; |
mbed_official | 31:42176bc3c368 | 175 | p_error = error; |
mbed_official | 31:42176bc3c368 | 176 | } |
mbed_official | 31:42176bc3c368 | 177 | } |
mbed_official | 31:42176bc3c368 | 178 | } |
mbed_official | 31:42176bc3c368 | 179 | |
mbed_official | 31:42176bc3c368 | 180 | // set SPPR and SPR |
mbed_official | 31:42176bc3c368 | 181 | obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf); |
mbed_official | 31:42176bc3c368 | 182 | } |
mbed_official | 31:42176bc3c368 | 183 | |
mbed_official | 31:42176bc3c368 | 184 | static inline int spi_writeable(spi_t * obj) { |
mbed_official | 31:42176bc3c368 | 185 | return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0; |
mbed_official | 31:42176bc3c368 | 186 | } |
mbed_official | 31:42176bc3c368 | 187 | |
mbed_official | 31:42176bc3c368 | 188 | static inline int spi_readable(spi_t * obj) { |
mbed_official | 31:42176bc3c368 | 189 | return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0; |
mbed_official | 31:42176bc3c368 | 190 | } |
mbed_official | 31:42176bc3c368 | 191 | |
mbed_official | 31:42176bc3c368 | 192 | int spi_master_write(spi_t *obj, int value) { |
mbed_official | 44:2ce89a25b635 | 193 | int ret; |
mbed_official | 44:2ce89a25b635 | 194 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
mbed_official | 44:2ce89a25b635 | 195 | // 16bit |
mbed_official | 44:2ce89a25b635 | 196 | while(!spi_writeable(obj)); |
mbed_official | 44:2ce89a25b635 | 197 | obj->spi->DL = (value & 0xff); |
mbed_official | 44:2ce89a25b635 | 198 | obj->spi->DH = ((value >> 8) & 0xff); |
mbed_official | 31:42176bc3c368 | 199 | |
mbed_official | 44:2ce89a25b635 | 200 | // wait rx buffer full |
mbed_official | 44:2ce89a25b635 | 201 | while (!spi_readable(obj)); |
mbed_official | 44:2ce89a25b635 | 202 | ret = obj->spi->DH; |
mbed_official | 44:2ce89a25b635 | 203 | ret = (ret << 8) | obj->spi->DL; |
mbed_official | 44:2ce89a25b635 | 204 | } else { |
mbed_official | 44:2ce89a25b635 | 205 | //8bit |
mbed_official | 44:2ce89a25b635 | 206 | while(!spi_writeable(obj)); |
mbed_official | 44:2ce89a25b635 | 207 | obj->spi->DL = (value & 0xff); |
mbed_official | 44:2ce89a25b635 | 208 | |
mbed_official | 44:2ce89a25b635 | 209 | // wait rx buffer full |
mbed_official | 44:2ce89a25b635 | 210 | while (!spi_readable(obj)); |
mbed_official | 44:2ce89a25b635 | 211 | ret = (obj->spi->DL & 0xff); |
mbed_official | 44:2ce89a25b635 | 212 | } |
mbed_official | 44:2ce89a25b635 | 213 | |
mbed_official | 44:2ce89a25b635 | 214 | return ret; |
mbed_official | 31:42176bc3c368 | 215 | } |
mbed_official | 31:42176bc3c368 | 216 | |
mbed_official | 31:42176bc3c368 | 217 | int spi_slave_receive(spi_t *obj) { |
mbed_official | 31:42176bc3c368 | 218 | return spi_readable(obj); |
mbed_official | 31:42176bc3c368 | 219 | } |
mbed_official | 31:42176bc3c368 | 220 | |
mbed_official | 31:42176bc3c368 | 221 | int spi_slave_read(spi_t *obj) { |
mbed_official | 44:2ce89a25b635 | 222 | int ret; |
mbed_official | 44:2ce89a25b635 | 223 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
mbed_official | 44:2ce89a25b635 | 224 | ret = obj->spi->DH; |
mbed_official | 44:2ce89a25b635 | 225 | ret = ((ret << 8) | obj->spi->DL); |
mbed_official | 44:2ce89a25b635 | 226 | } else { |
mbed_official | 44:2ce89a25b635 | 227 | ret = obj->spi->DL; |
mbed_official | 44:2ce89a25b635 | 228 | } |
mbed_official | 44:2ce89a25b635 | 229 | return ret; |
mbed_official | 31:42176bc3c368 | 230 | } |
mbed_official | 31:42176bc3c368 | 231 | |
mbed_official | 31:42176bc3c368 | 232 | void spi_slave_write(spi_t *obj, int value) { |
mbed_official | 31:42176bc3c368 | 233 | while (!spi_writeable(obj)); |
mbed_official | 44:2ce89a25b635 | 234 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
mbed_official | 44:2ce89a25b635 | 235 | obj->spi->DL = (value & 0xff); |
mbed_official | 44:2ce89a25b635 | 236 | obj->spi->DH = ((value >> 8) & 0xff); |
mbed_official | 44:2ce89a25b635 | 237 | } else { |
mbed_official | 44:2ce89a25b635 | 238 | obj->spi->DL = value; |
mbed_official | 44:2ce89a25b635 | 239 | } |
mbed_official | 44:2ce89a25b635 | 240 | |
mbed_official | 31:42176bc3c368 | 241 | } |