added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL46Z/spi_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)
- Committer:
- JojoS
- Date:
- Sat Sep 10 15:32:04 2016 +0000
- Revision:
- 147:ba84b7dc41a7
- Parent:
- 144:ef7eb2e8f9f7
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 144:ef7eb2e8f9f7 | 3 | * |
<> | 144:ef7eb2e8f9f7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 144:ef7eb2e8f9f7 | 5 | * you may not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 6 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 144:ef7eb2e8f9f7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 13 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 14 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 15 | */ |
<> | 144:ef7eb2e8f9f7 | 16 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 17 | #include "spi_api.h" |
<> | 144:ef7eb2e8f9f7 | 18 | |
<> | 144:ef7eb2e8f9f7 | 19 | #include <math.h> |
<> | 144:ef7eb2e8f9f7 | 20 | |
<> | 144:ef7eb2e8f9f7 | 21 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 22 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 23 | |
<> | 144:ef7eb2e8f9f7 | 24 | static const PinMap PinMap_SPI_SCLK[] = { |
<> | 144:ef7eb2e8f9f7 | 25 | {PTA15, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 26 | {PTB9, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 27 | {PTB11, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 28 | {PTC5, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 29 | {PTD1, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 30 | {PTD5, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 31 | {PTE2, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 32 | {PTE17, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 33 | {NC , NC , 0} |
<> | 144:ef7eb2e8f9f7 | 34 | }; |
<> | 144:ef7eb2e8f9f7 | 35 | |
<> | 144:ef7eb2e8f9f7 | 36 | static const PinMap PinMap_SPI_MOSI[] = { |
<> | 144:ef7eb2e8f9f7 | 37 | {PTA16, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 38 | {PTA17, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 39 | {PTB16, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 40 | {PTB17, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 41 | {PTC6, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 42 | {PTC7, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 43 | {PTD2, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 44 | {PTD3, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 45 | {PTD6, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 46 | {PTD7, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 47 | {PTE1, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 48 | {PTE3, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 49 | {PTE18, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 50 | {PTE19, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 51 | {NC , NC , 0} |
<> | 144:ef7eb2e8f9f7 | 52 | }; |
<> | 144:ef7eb2e8f9f7 | 53 | |
<> | 144:ef7eb2e8f9f7 | 54 | static const PinMap PinMap_SPI_MISO[] = { |
<> | 144:ef7eb2e8f9f7 | 55 | {PTA16, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 56 | {PTA17, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 57 | {PTB16, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 58 | {PTB17, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 59 | {PTC6, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 60 | {PTC7, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 61 | {PTD2, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 62 | {PTD3, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 63 | {PTD6, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 64 | {PTD7, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 65 | {PTE1, SPI_1, 5}, |
<> | 144:ef7eb2e8f9f7 | 66 | {PTE3, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 67 | {PTE18, SPI_0, 5}, |
<> | 144:ef7eb2e8f9f7 | 68 | {PTE19, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 69 | {NC , NC , 0} |
<> | 144:ef7eb2e8f9f7 | 70 | }; |
<> | 144:ef7eb2e8f9f7 | 71 | |
<> | 144:ef7eb2e8f9f7 | 72 | static const PinMap PinMap_SPI_SSEL[] = { |
<> | 144:ef7eb2e8f9f7 | 73 | {PTA14, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 74 | {PTB10, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 75 | {PTC4, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 76 | {PTD0, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 77 | {PTD4, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 78 | {PTE4, SPI_1, 2}, |
<> | 144:ef7eb2e8f9f7 | 79 | {PTE16, SPI_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 80 | {NC , NC , 0} |
<> | 144:ef7eb2e8f9f7 | 81 | }; |
<> | 144:ef7eb2e8f9f7 | 82 | |
<> | 144:ef7eb2e8f9f7 | 83 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
<> | 144:ef7eb2e8f9f7 | 84 | // determine the SPI to use |
<> | 144:ef7eb2e8f9f7 | 85 | SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
<> | 144:ef7eb2e8f9f7 | 86 | SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); |
<> | 144:ef7eb2e8f9f7 | 87 | SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
<> | 144:ef7eb2e8f9f7 | 88 | SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
<> | 144:ef7eb2e8f9f7 | 89 | SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); |
<> | 144:ef7eb2e8f9f7 | 90 | SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); |
<> | 144:ef7eb2e8f9f7 | 91 | |
<> | 144:ef7eb2e8f9f7 | 92 | obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl); |
<> | 144:ef7eb2e8f9f7 | 93 | MBED_ASSERT((int)obj->spi != NC); |
<> | 144:ef7eb2e8f9f7 | 94 | |
<> | 144:ef7eb2e8f9f7 | 95 | // enable power and clocking |
<> | 144:ef7eb2e8f9f7 | 96 | switch ((int)obj->spi) { |
<> | 144:ef7eb2e8f9f7 | 97 | case SPI_0: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 22; break; |
<> | 144:ef7eb2e8f9f7 | 98 | case SPI_1: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 23; break; |
<> | 144:ef7eb2e8f9f7 | 99 | } |
<> | 144:ef7eb2e8f9f7 | 100 | |
<> | 144:ef7eb2e8f9f7 | 101 | // enable SPI |
<> | 144:ef7eb2e8f9f7 | 102 | obj->spi->C1 |= SPI_C1_SPE_MASK; |
<> | 144:ef7eb2e8f9f7 | 103 | obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; //8bit |
<> | 144:ef7eb2e8f9f7 | 104 | |
<> | 144:ef7eb2e8f9f7 | 105 | // pin out the spi pins |
<> | 144:ef7eb2e8f9f7 | 106 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
<> | 144:ef7eb2e8f9f7 | 107 | pinmap_pinout(miso, PinMap_SPI_MISO); |
<> | 144:ef7eb2e8f9f7 | 108 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
<> | 144:ef7eb2e8f9f7 | 109 | if (ssel != NC) { |
<> | 144:ef7eb2e8f9f7 | 110 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
<> | 144:ef7eb2e8f9f7 | 111 | } |
<> | 144:ef7eb2e8f9f7 | 112 | } |
<> | 144:ef7eb2e8f9f7 | 113 | |
<> | 144:ef7eb2e8f9f7 | 114 | void spi_free(spi_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 115 | // [TODO] |
<> | 144:ef7eb2e8f9f7 | 116 | } |
<> | 144:ef7eb2e8f9f7 | 117 | void spi_format(spi_t *obj, int bits, int mode, int slave) { |
<> | 144:ef7eb2e8f9f7 | 118 | MBED_ASSERT((bits == 8) || (bits == 16)); |
<> | 144:ef7eb2e8f9f7 | 119 | MBED_ASSERT((mode >= 0) && (mode <= 3)); |
<> | 144:ef7eb2e8f9f7 | 120 | |
<> | 144:ef7eb2e8f9f7 | 121 | uint8_t polarity = (mode & 0x2) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 122 | uint8_t phase = (mode & 0x1) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 123 | uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2); |
<> | 144:ef7eb2e8f9f7 | 124 | |
<> | 144:ef7eb2e8f9f7 | 125 | // clear MSTR, CPOL and CPHA bits |
<> | 144:ef7eb2e8f9f7 | 126 | obj->spi->C1 &= ~(0x7 << 2); |
<> | 144:ef7eb2e8f9f7 | 127 | |
<> | 144:ef7eb2e8f9f7 | 128 | // write new value |
<> | 144:ef7eb2e8f9f7 | 129 | obj->spi->C1 |= c1_data; |
<> | 144:ef7eb2e8f9f7 | 130 | if (bits == 8) { |
<> | 144:ef7eb2e8f9f7 | 131 | obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; |
<> | 144:ef7eb2e8f9f7 | 132 | } else { |
<> | 144:ef7eb2e8f9f7 | 133 | obj->spi->C2 |= SPI_C2_SPIMODE_MASK; |
<> | 144:ef7eb2e8f9f7 | 134 | } |
<> | 144:ef7eb2e8f9f7 | 135 | } |
<> | 144:ef7eb2e8f9f7 | 136 | |
<> | 144:ef7eb2e8f9f7 | 137 | void spi_frequency(spi_t *obj, int hz) { |
<> | 144:ef7eb2e8f9f7 | 138 | uint32_t error = 0; |
<> | 144:ef7eb2e8f9f7 | 139 | uint32_t p_error = 0xffffffff; |
<> | 144:ef7eb2e8f9f7 | 140 | uint32_t ref = 0; |
<> | 144:ef7eb2e8f9f7 | 141 | uint8_t spr = 0; |
<> | 144:ef7eb2e8f9f7 | 142 | uint8_t ref_spr = 0; |
<> | 144:ef7eb2e8f9f7 | 143 | uint8_t ref_prescaler = 0; |
<> | 144:ef7eb2e8f9f7 | 144 | |
<> | 144:ef7eb2e8f9f7 | 145 | // bus clk |
<> | 144:ef7eb2e8f9f7 | 146 | uint32_t PCLK = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1); |
<> | 144:ef7eb2e8f9f7 | 147 | uint8_t prescaler = 1; |
<> | 144:ef7eb2e8f9f7 | 148 | uint8_t divisor = 2; |
<> | 144:ef7eb2e8f9f7 | 149 | |
<> | 144:ef7eb2e8f9f7 | 150 | for (prescaler = 1; prescaler <= 8; prescaler++) { |
<> | 144:ef7eb2e8f9f7 | 151 | divisor = 2; |
<> | 144:ef7eb2e8f9f7 | 152 | for (spr = 0; spr <= 8; spr++, divisor *= 2) { |
<> | 144:ef7eb2e8f9f7 | 153 | ref = PCLK / (prescaler*divisor); |
<> | 144:ef7eb2e8f9f7 | 154 | if (ref > (uint32_t)hz) |
<> | 144:ef7eb2e8f9f7 | 155 | continue; |
<> | 144:ef7eb2e8f9f7 | 156 | error = hz - ref; |
<> | 144:ef7eb2e8f9f7 | 157 | if (error < p_error) { |
<> | 144:ef7eb2e8f9f7 | 158 | ref_spr = spr; |
<> | 144:ef7eb2e8f9f7 | 159 | ref_prescaler = prescaler - 1; |
<> | 144:ef7eb2e8f9f7 | 160 | p_error = error; |
<> | 144:ef7eb2e8f9f7 | 161 | } |
<> | 144:ef7eb2e8f9f7 | 162 | } |
<> | 144:ef7eb2e8f9f7 | 163 | } |
<> | 144:ef7eb2e8f9f7 | 164 | |
<> | 144:ef7eb2e8f9f7 | 165 | // set SPPR and SPR |
<> | 144:ef7eb2e8f9f7 | 166 | obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf); |
<> | 144:ef7eb2e8f9f7 | 167 | } |
<> | 144:ef7eb2e8f9f7 | 168 | |
<> | 144:ef7eb2e8f9f7 | 169 | static inline int spi_writeable(spi_t * obj) { |
<> | 144:ef7eb2e8f9f7 | 170 | return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 171 | } |
<> | 144:ef7eb2e8f9f7 | 172 | |
<> | 144:ef7eb2e8f9f7 | 173 | static inline int spi_readable(spi_t * obj) { |
<> | 144:ef7eb2e8f9f7 | 174 | return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 175 | } |
<> | 144:ef7eb2e8f9f7 | 176 | |
<> | 144:ef7eb2e8f9f7 | 177 | int spi_master_write(spi_t *obj, int value) { |
<> | 144:ef7eb2e8f9f7 | 178 | int ret; |
<> | 144:ef7eb2e8f9f7 | 179 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
<> | 144:ef7eb2e8f9f7 | 180 | // 16bit |
<> | 144:ef7eb2e8f9f7 | 181 | while(!spi_writeable(obj)); |
<> | 144:ef7eb2e8f9f7 | 182 | obj->spi->DL = (value & 0xff); |
<> | 144:ef7eb2e8f9f7 | 183 | obj->spi->DH = ((value >> 8) & 0xff); |
<> | 144:ef7eb2e8f9f7 | 184 | |
<> | 144:ef7eb2e8f9f7 | 185 | // wait rx buffer full |
<> | 144:ef7eb2e8f9f7 | 186 | while (!spi_readable(obj)); |
<> | 144:ef7eb2e8f9f7 | 187 | ret = obj->spi->DH; |
<> | 144:ef7eb2e8f9f7 | 188 | ret = (ret << 8) | obj->spi->DL; |
<> | 144:ef7eb2e8f9f7 | 189 | } else { |
<> | 144:ef7eb2e8f9f7 | 190 | //8bit |
<> | 144:ef7eb2e8f9f7 | 191 | while(!spi_writeable(obj)); |
<> | 144:ef7eb2e8f9f7 | 192 | obj->spi->DL = (value & 0xff); |
<> | 144:ef7eb2e8f9f7 | 193 | |
<> | 144:ef7eb2e8f9f7 | 194 | // wait rx buffer full |
<> | 144:ef7eb2e8f9f7 | 195 | while (!spi_readable(obj)); |
<> | 144:ef7eb2e8f9f7 | 196 | ret = (obj->spi->DL & 0xff); |
<> | 144:ef7eb2e8f9f7 | 197 | } |
<> | 144:ef7eb2e8f9f7 | 198 | |
<> | 144:ef7eb2e8f9f7 | 199 | return ret; |
<> | 144:ef7eb2e8f9f7 | 200 | } |
<> | 144:ef7eb2e8f9f7 | 201 | |
<> | 144:ef7eb2e8f9f7 | 202 | int spi_slave_receive(spi_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 203 | return spi_readable(obj); |
<> | 144:ef7eb2e8f9f7 | 204 | } |
<> | 144:ef7eb2e8f9f7 | 205 | |
<> | 144:ef7eb2e8f9f7 | 206 | int spi_slave_read(spi_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 207 | int ret; |
<> | 144:ef7eb2e8f9f7 | 208 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
<> | 144:ef7eb2e8f9f7 | 209 | ret = obj->spi->DH; |
<> | 144:ef7eb2e8f9f7 | 210 | ret = ((ret << 8) | obj->spi->DL); |
<> | 144:ef7eb2e8f9f7 | 211 | } else { |
<> | 144:ef7eb2e8f9f7 | 212 | ret = obj->spi->DL; |
<> | 144:ef7eb2e8f9f7 | 213 | } |
<> | 144:ef7eb2e8f9f7 | 214 | return ret; |
<> | 144:ef7eb2e8f9f7 | 215 | } |
<> | 144:ef7eb2e8f9f7 | 216 | |
<> | 144:ef7eb2e8f9f7 | 217 | void spi_slave_write(spi_t *obj, int value) { |
<> | 144:ef7eb2e8f9f7 | 218 | while (!spi_writeable(obj)); |
<> | 144:ef7eb2e8f9f7 | 219 | if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { |
<> | 144:ef7eb2e8f9f7 | 220 | obj->spi->DL = (value & 0xff); |
<> | 144:ef7eb2e8f9f7 | 221 | obj->spi->DH = ((value >> 8) & 0xff); |
<> | 144:ef7eb2e8f9f7 | 222 | } else { |
<> | 144:ef7eb2e8f9f7 | 223 | obj->spi->DL = value; |
<> | 144:ef7eb2e8f9f7 | 224 | } |
<> | 144:ef7eb2e8f9f7 | 225 | |
<> | 144:ef7eb2e8f9f7 | 226 | } |