mbed library with additional peripherals for ST F401 board
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This mbed LIB has additional peripherals for ST F401 board
- UART2 : PA_3 rx, PA_2 tx
- UART3 : PC_7 rx, PC_6 tx
- I2C2 : PB_3 SDA, PB_10 SCL
- I2C3 : PB_4 SDA, PA_8 SCL
targets/hal/TARGET_Freescale/TARGET_KL05Z/spi_api.c@72:248c61396e08, 2014-01-13 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Jan 13 10:45:05 2014 +0000
- Revision:
- 72:248c61396e08
- Parent:
- 20:4263a77256ae
- Child:
- 78:2cab419ff388
Synchronized with git revision f1904ba15c06215a7530efd2d5a16c25af9d29ff
Full URL: https://github.com/mbedmicro/mbed/commit/f1904ba15c06215a7530efd2d5a16c25af9d29ff/
KL46Z: Added Sleep, LED3 and LED4 definitions, switches
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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 | #include "spi_api.h" |
bogdanm | 20:4263a77256ae | 17 | |
bogdanm | 20:4263a77256ae | 18 | #include <math.h> |
bogdanm | 20:4263a77256ae | 19 | |
bogdanm | 20:4263a77256ae | 20 | #include "cmsis.h" |
bogdanm | 20:4263a77256ae | 21 | #include "pinmap.h" |
bogdanm | 20:4263a77256ae | 22 | #include "error.h" |
bogdanm | 20:4263a77256ae | 23 | |
bogdanm | 20:4263a77256ae | 24 | static const PinMap PinMap_SPI_SCLK[] = { |
bogdanm | 20:4263a77256ae | 25 | {PTB0, SPI_0, 3}, |
bogdanm | 20:4263a77256ae | 26 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 27 | }; |
bogdanm | 20:4263a77256ae | 28 | |
bogdanm | 20:4263a77256ae | 29 | static const PinMap PinMap_SPI_MOSI[] = { |
bogdanm | 20:4263a77256ae | 30 | {PTA7, SPI_0, 3}, |
bogdanm | 20:4263a77256ae | 31 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 32 | }; |
bogdanm | 20:4263a77256ae | 33 | |
bogdanm | 20:4263a77256ae | 34 | static const PinMap PinMap_SPI_MISO[] = { |
bogdanm | 20:4263a77256ae | 35 | {PTA6, SPI_0, 3}, |
bogdanm | 20:4263a77256ae | 36 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 37 | }; |
bogdanm | 20:4263a77256ae | 38 | |
bogdanm | 20:4263a77256ae | 39 | static const PinMap PinMap_SPI_SSEL[] = { |
bogdanm | 20:4263a77256ae | 40 | {PTA5, SPI_0, 3}, |
bogdanm | 20:4263a77256ae | 41 | {NC , NC , 0} |
bogdanm | 20:4263a77256ae | 42 | }; |
bogdanm | 20:4263a77256ae | 43 | |
bogdanm | 20:4263a77256ae | 44 | void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { |
bogdanm | 20:4263a77256ae | 45 | // determine the SPI to use |
bogdanm | 20:4263a77256ae | 46 | SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); |
bogdanm | 20:4263a77256ae | 47 | SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); |
bogdanm | 20:4263a77256ae | 48 | SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); |
bogdanm | 20:4263a77256ae | 49 | SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); |
bogdanm | 20:4263a77256ae | 50 | SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); |
bogdanm | 20:4263a77256ae | 51 | SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); |
bogdanm | 20:4263a77256ae | 52 | |
bogdanm | 20:4263a77256ae | 53 | obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl); |
bogdanm | 20:4263a77256ae | 54 | if ((int)obj->spi == NC) { |
bogdanm | 20:4263a77256ae | 55 | error("SPI pinout mapping failed"); |
bogdanm | 20:4263a77256ae | 56 | } |
bogdanm | 20:4263a77256ae | 57 | |
bogdanm | 20:4263a77256ae | 58 | // enable power and clocking |
bogdanm | 20:4263a77256ae | 59 | switch ((int)obj->spi) { |
bogdanm | 20:4263a77256ae | 60 | case SPI_0: |
bogdanm | 20:4263a77256ae | 61 | SIM->SCGC5 |= (SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK); |
bogdanm | 20:4263a77256ae | 62 | SIM->SCGC4 |= SIM_SCGC4_SPI0_MASK; |
bogdanm | 20:4263a77256ae | 63 | break; |
bogdanm | 20:4263a77256ae | 64 | } |
bogdanm | 20:4263a77256ae | 65 | |
bogdanm | 20:4263a77256ae | 66 | // set default format and frequency |
bogdanm | 20:4263a77256ae | 67 | if (ssel == NC) { |
bogdanm | 20:4263a77256ae | 68 | spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master |
bogdanm | 20:4263a77256ae | 69 | } else { |
bogdanm | 20:4263a77256ae | 70 | spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave |
bogdanm | 20:4263a77256ae | 71 | } |
bogdanm | 20:4263a77256ae | 72 | spi_frequency(obj, 1000000); |
bogdanm | 20:4263a77256ae | 73 | |
bogdanm | 20:4263a77256ae | 74 | // enable SPI |
bogdanm | 20:4263a77256ae | 75 | obj->spi->C1 |= SPI_C1_SPE_MASK; |
bogdanm | 20:4263a77256ae | 76 | |
bogdanm | 20:4263a77256ae | 77 | // pin out the spi pins |
bogdanm | 20:4263a77256ae | 78 | pinmap_pinout(mosi, PinMap_SPI_MOSI); |
bogdanm | 20:4263a77256ae | 79 | pinmap_pinout(miso, PinMap_SPI_MISO); |
bogdanm | 20:4263a77256ae | 80 | pinmap_pinout(sclk, PinMap_SPI_SCLK); |
bogdanm | 20:4263a77256ae | 81 | if (ssel != NC) { |
bogdanm | 20:4263a77256ae | 82 | pinmap_pinout(ssel, PinMap_SPI_SSEL); |
bogdanm | 20:4263a77256ae | 83 | } |
bogdanm | 20:4263a77256ae | 84 | } |
bogdanm | 20:4263a77256ae | 85 | |
bogdanm | 20:4263a77256ae | 86 | void spi_free(spi_t *obj) { |
bogdanm | 20:4263a77256ae | 87 | // [TODO] |
bogdanm | 20:4263a77256ae | 88 | } |
bogdanm | 20:4263a77256ae | 89 | void spi_format(spi_t *obj, int bits, int mode, int slave) { |
bogdanm | 20:4263a77256ae | 90 | if (bits != 8) { |
bogdanm | 20:4263a77256ae | 91 | error("Only 8bits SPI supported"); |
bogdanm | 20:4263a77256ae | 92 | } |
bogdanm | 20:4263a77256ae | 93 | |
bogdanm | 20:4263a77256ae | 94 | if ((mode < 0) || (mode > 3)) { |
bogdanm | 20:4263a77256ae | 95 | error("SPI mode unsupported"); |
bogdanm | 20:4263a77256ae | 96 | } |
bogdanm | 20:4263a77256ae | 97 | |
bogdanm | 20:4263a77256ae | 98 | uint8_t polarity = (mode & 0x2) ? 1 : 0; |
bogdanm | 20:4263a77256ae | 99 | uint8_t phase = (mode & 0x1) ? 1 : 0; |
bogdanm | 20:4263a77256ae | 100 | uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2); |
bogdanm | 20:4263a77256ae | 101 | |
bogdanm | 20:4263a77256ae | 102 | // clear MSTR, CPOL and CPHA bits |
bogdanm | 20:4263a77256ae | 103 | obj->spi->C1 &= ~(0x7 << 2); |
bogdanm | 20:4263a77256ae | 104 | |
bogdanm | 20:4263a77256ae | 105 | // write new value |
bogdanm | 20:4263a77256ae | 106 | obj->spi->C1 |= c1_data; |
bogdanm | 20:4263a77256ae | 107 | } |
bogdanm | 20:4263a77256ae | 108 | |
bogdanm | 20:4263a77256ae | 109 | void spi_frequency(spi_t *obj, int hz) { |
bogdanm | 20:4263a77256ae | 110 | uint32_t error = 0; |
bogdanm | 20:4263a77256ae | 111 | uint32_t p_error = 0xffffffff; |
bogdanm | 20:4263a77256ae | 112 | uint32_t ref = 0; |
bogdanm | 20:4263a77256ae | 113 | uint8_t spr = 0; |
bogdanm | 20:4263a77256ae | 114 | uint8_t ref_spr = 0; |
bogdanm | 20:4263a77256ae | 115 | uint8_t ref_prescaler = 0; |
bogdanm | 20:4263a77256ae | 116 | |
bogdanm | 20:4263a77256ae | 117 | // bus clk |
mbed_official | 72:248c61396e08 | 118 | uint32_t PCLK = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1); |
bogdanm | 20:4263a77256ae | 119 | uint8_t prescaler = 1; |
bogdanm | 20:4263a77256ae | 120 | uint8_t divisor = 2; |
bogdanm | 20:4263a77256ae | 121 | |
bogdanm | 20:4263a77256ae | 122 | for (prescaler = 1; prescaler <= 8; prescaler++) { |
bogdanm | 20:4263a77256ae | 123 | divisor = 2; |
bogdanm | 20:4263a77256ae | 124 | for (spr = 0; spr <= 8; spr++) { |
bogdanm | 20:4263a77256ae | 125 | ref = PCLK / (prescaler*divisor); |
bogdanm | 20:4263a77256ae | 126 | error = (ref > hz) ? ref - hz : hz - ref; |
bogdanm | 20:4263a77256ae | 127 | if (error < p_error) { |
bogdanm | 20:4263a77256ae | 128 | ref_spr = spr; |
bogdanm | 20:4263a77256ae | 129 | ref_prescaler = prescaler - 1; |
bogdanm | 20:4263a77256ae | 130 | p_error = error; |
bogdanm | 20:4263a77256ae | 131 | } |
bogdanm | 20:4263a77256ae | 132 | divisor *= 2; |
bogdanm | 20:4263a77256ae | 133 | } |
bogdanm | 20:4263a77256ae | 134 | } |
bogdanm | 20:4263a77256ae | 135 | |
bogdanm | 20:4263a77256ae | 136 | // set SPPR and SPR |
bogdanm | 20:4263a77256ae | 137 | obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf); |
bogdanm | 20:4263a77256ae | 138 | } |
bogdanm | 20:4263a77256ae | 139 | |
bogdanm | 20:4263a77256ae | 140 | static inline int spi_writeable(spi_t * obj) { |
bogdanm | 20:4263a77256ae | 141 | return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0; |
bogdanm | 20:4263a77256ae | 142 | } |
bogdanm | 20:4263a77256ae | 143 | |
bogdanm | 20:4263a77256ae | 144 | static inline int spi_readable(spi_t * obj) { |
bogdanm | 20:4263a77256ae | 145 | return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0; |
bogdanm | 20:4263a77256ae | 146 | } |
bogdanm | 20:4263a77256ae | 147 | |
bogdanm | 20:4263a77256ae | 148 | int spi_master_write(spi_t *obj, int value) { |
bogdanm | 20:4263a77256ae | 149 | // wait tx buffer empty |
bogdanm | 20:4263a77256ae | 150 | while(!spi_writeable(obj)); |
bogdanm | 20:4263a77256ae | 151 | obj->spi->D = (value & 0xff); |
bogdanm | 20:4263a77256ae | 152 | |
bogdanm | 20:4263a77256ae | 153 | // wait rx buffer full |
bogdanm | 20:4263a77256ae | 154 | while (!spi_readable(obj)); |
bogdanm | 20:4263a77256ae | 155 | return obj->spi->D & 0xff; |
bogdanm | 20:4263a77256ae | 156 | } |
bogdanm | 20:4263a77256ae | 157 | |
bogdanm | 20:4263a77256ae | 158 | int spi_slave_receive(spi_t *obj) { |
bogdanm | 20:4263a77256ae | 159 | return spi_readable(obj); |
bogdanm | 20:4263a77256ae | 160 | } |
bogdanm | 20:4263a77256ae | 161 | |
bogdanm | 20:4263a77256ae | 162 | int spi_slave_read(spi_t *obj) { |
bogdanm | 20:4263a77256ae | 163 | return obj->spi->D; |
bogdanm | 20:4263a77256ae | 164 | } |
bogdanm | 20:4263a77256ae | 165 | |
bogdanm | 20:4263a77256ae | 166 | void spi_slave_write(spi_t *obj, int value) { |
bogdanm | 20:4263a77256ae | 167 | while (!spi_writeable(obj)); |
bogdanm | 20:4263a77256ae | 168 | obj->spi->D = value; |
bogdanm | 20:4263a77256ae | 169 | } |