takashi kadono / Mbed OS Nucleo446_SSD1331

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/targets/TARGET_Freescale/TARGET_K20XX/spi_api.c@0:8fdf9a60065b, 2018-10-10 (annotated)

Committer:
kadonotakashi
Date:
Wed Oct 10 00:33:53 2018 +0000
Revision:
0:8fdf9a60065b
how to make mbed librry

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /* mbed Microcontroller Library
kadonotakashi 0:8fdf9a60065b 2 * Copyright (c) 2015 ARM Limited
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Licensed under the Apache License, Version 2.0 (the "License");
kadonotakashi 0:8fdf9a60065b 5 * you may not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 6 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 7 *
kadonotakashi 0:8fdf9a60065b 8 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 9 *
kadonotakashi 0:8fdf9a60065b 10 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 11 * distributed under the License is distributed on an "AS IS" BASIS,
kadonotakashi 0:8fdf9a60065b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 13 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 14 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 15 */
kadonotakashi 0:8fdf9a60065b 16 #include "mbed_assert.h"
kadonotakashi 0:8fdf9a60065b 17 #include "spi_api.h"
kadonotakashi 0:8fdf9a60065b 18
kadonotakashi 0:8fdf9a60065b 19 #include <math.h>
kadonotakashi 0:8fdf9a60065b 20
kadonotakashi 0:8fdf9a60065b 21 #include "cmsis.h"
kadonotakashi 0:8fdf9a60065b 22 #include "pinmap.h"
kadonotakashi 0:8fdf9a60065b 23 #include "clk_freqs.h"
kadonotakashi 0:8fdf9a60065b 24 #include "PeripheralPins.h"
kadonotakashi 0:8fdf9a60065b 25
kadonotakashi 0:8fdf9a60065b 26 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
kadonotakashi 0:8fdf9a60065b 27 // determine the SPI to use
kadonotakashi 0:8fdf9a60065b 28 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
kadonotakashi 0:8fdf9a60065b 29 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
kadonotakashi 0:8fdf9a60065b 30 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
kadonotakashi 0:8fdf9a60065b 31 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
kadonotakashi 0:8fdf9a60065b 32 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
kadonotakashi 0:8fdf9a60065b 33 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
kadonotakashi 0:8fdf9a60065b 34
kadonotakashi 0:8fdf9a60065b 35 obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl);
kadonotakashi 0:8fdf9a60065b 36 MBED_ASSERT((int)obj->spi != NC);
kadonotakashi 0:8fdf9a60065b 37
kadonotakashi 0:8fdf9a60065b 38 SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK | SIM_SCGC5_PORTD_MASK;
kadonotakashi 0:8fdf9a60065b 39 SIM->SCGC6 |= SIM_SCGC6_SPI0_MASK;
kadonotakashi 0:8fdf9a60065b 40
kadonotakashi 0:8fdf9a60065b 41 obj->spi->MCR &= ~(SPI_MCR_MDIS_MASK | SPI_MCR_HALT_MASK);
kadonotakashi 0:8fdf9a60065b 42 //obj->spi->MCR |= SPI_MCR_DIS_RXF_MASK | SPI_MCR_DIS_TXF_MASK;
kadonotakashi 0:8fdf9a60065b 43
kadonotakashi 0:8fdf9a60065b 44 // not halt in the debug mode
kadonotakashi 0:8fdf9a60065b 45 obj->spi->SR |= SPI_SR_EOQF_MASK;
kadonotakashi 0:8fdf9a60065b 46
kadonotakashi 0:8fdf9a60065b 47 // pin out the spi pins
kadonotakashi 0:8fdf9a60065b 48 pinmap_pinout(mosi, PinMap_SPI_MOSI);
kadonotakashi 0:8fdf9a60065b 49 pinmap_pinout(miso, PinMap_SPI_MISO);
kadonotakashi 0:8fdf9a60065b 50 pinmap_pinout(sclk, PinMap_SPI_SCLK);
kadonotakashi 0:8fdf9a60065b 51 if (ssel != NC) {
kadonotakashi 0:8fdf9a60065b 52 pinmap_pinout(ssel, PinMap_SPI_SSEL);
kadonotakashi 0:8fdf9a60065b 53 }
kadonotakashi 0:8fdf9a60065b 54 }
kadonotakashi 0:8fdf9a60065b 55
kadonotakashi 0:8fdf9a60065b 56 void spi_free(spi_t *obj) {
kadonotakashi 0:8fdf9a60065b 57 // [TODO]
kadonotakashi 0:8fdf9a60065b 58 }
kadonotakashi 0:8fdf9a60065b 59 void spi_format(spi_t *obj, int bits, int mode, int slave) {
kadonotakashi 0:8fdf9a60065b 60 MBED_ASSERT((bits > 4) || (bits < 16));
kadonotakashi 0:8fdf9a60065b 61 MBED_ASSERT((mode >= 0) && (mode <= 3));
kadonotakashi 0:8fdf9a60065b 62
kadonotakashi 0:8fdf9a60065b 63 uint8_t polarity = (mode & 0x2) ? 1 : 0;
kadonotakashi 0:8fdf9a60065b 64 uint8_t phase = (mode & 0x1) ? 1 : 0;
kadonotakashi 0:8fdf9a60065b 65 uint8_t old_polarity = (obj->spi->CTAR[0] & SPI_CTAR_CPOL_MASK) != 0;
kadonotakashi 0:8fdf9a60065b 66
kadonotakashi 0:8fdf9a60065b 67 // set master/slave
kadonotakashi 0:8fdf9a60065b 68 if (slave) {
kadonotakashi 0:8fdf9a60065b 69 obj->spi->MCR &= ~SPI_MCR_MSTR_MASK;
kadonotakashi 0:8fdf9a60065b 70 } else {
kadonotakashi 0:8fdf9a60065b 71 obj->spi->MCR |= (1UL << SPI_MCR_MSTR_SHIFT);
kadonotakashi 0:8fdf9a60065b 72 }
kadonotakashi 0:8fdf9a60065b 73
kadonotakashi 0:8fdf9a60065b 74 // CTAR0 is used
kadonotakashi 0:8fdf9a60065b 75 obj->spi->CTAR[0] &= ~(SPI_CTAR_CPHA_MASK | SPI_CTAR_CPOL_MASK | SPI_CTAR_FMSZ_MASK);
kadonotakashi 0:8fdf9a60065b 76 obj->spi->CTAR[0] |= (polarity << SPI_CTAR_CPOL_SHIFT) | (phase << SPI_CTAR_CPHA_SHIFT) | ((bits - 1) << SPI_CTAR_FMSZ_SHIFT);
kadonotakashi 0:8fdf9a60065b 77
kadonotakashi 0:8fdf9a60065b 78 //If clk idle state was changed, start a dummy transmission
kadonotakashi 0:8fdf9a60065b 79 //This is a 'feature' in DSPI: https://community.freescale.com/thread/105526
kadonotakashi 0:8fdf9a60065b 80 if ((old_polarity != polarity) && (slave == 0)) {
kadonotakashi 0:8fdf9a60065b 81 //Start transfer (CS should be high, so shouldn't matter)
kadonotakashi 0:8fdf9a60065b 82 spi_master_write(obj, 0xFFFF);
kadonotakashi 0:8fdf9a60065b 83 }
kadonotakashi 0:8fdf9a60065b 84 }
kadonotakashi 0:8fdf9a60065b 85
kadonotakashi 0:8fdf9a60065b 86 static const uint8_t baudrate_prescaler[] = {2,3,5,7};
kadonotakashi 0:8fdf9a60065b 87 static const uint16_t baudrate_scaler[] = {2,4,6,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768};
kadonotakashi 0:8fdf9a60065b 88
kadonotakashi 0:8fdf9a60065b 89 void spi_frequency(spi_t *obj, int hz) {
kadonotakashi 0:8fdf9a60065b 90 uint32_t f_error = 0;
kadonotakashi 0:8fdf9a60065b 91 uint32_t p_error = 0xffffffff;
kadonotakashi 0:8fdf9a60065b 92 uint32_t ref = 0;
kadonotakashi 0:8fdf9a60065b 93 uint32_t br = 0;
kadonotakashi 0:8fdf9a60065b 94 uint32_t ref_spr = 0;
kadonotakashi 0:8fdf9a60065b 95 uint32_t ref_prescaler = 0;
kadonotakashi 0:8fdf9a60065b 96 uint32_t ref_dr = 0;
kadonotakashi 0:8fdf9a60065b 97
kadonotakashi 0:8fdf9a60065b 98 // bus clk
kadonotakashi 0:8fdf9a60065b 99 uint32_t PCLK = bus_frequency();
kadonotakashi 0:8fdf9a60065b 100
kadonotakashi 0:8fdf9a60065b 101 for (uint32_t i = 0; i < 4; i++) {
kadonotakashi 0:8fdf9a60065b 102 for (br = 0; br <= 15; br++) {
kadonotakashi 0:8fdf9a60065b 103 for (uint32_t dr = 0; dr < 2; dr++) {
kadonotakashi 0:8fdf9a60065b 104 ref = (PCLK * (1U + dr) / baudrate_prescaler[i]) / baudrate_scaler[br];
kadonotakashi 0:8fdf9a60065b 105 if (ref > (uint32_t)hz)
kadonotakashi 0:8fdf9a60065b 106 continue;
kadonotakashi 0:8fdf9a60065b 107 f_error = hz - ref;
kadonotakashi 0:8fdf9a60065b 108 if (f_error < p_error) {
kadonotakashi 0:8fdf9a60065b 109 ref_spr = br;
kadonotakashi 0:8fdf9a60065b 110 ref_prescaler = i;
kadonotakashi 0:8fdf9a60065b 111 ref_dr = dr;
kadonotakashi 0:8fdf9a60065b 112 p_error = f_error;
kadonotakashi 0:8fdf9a60065b 113 }
kadonotakashi 0:8fdf9a60065b 114 }
kadonotakashi 0:8fdf9a60065b 115 }
kadonotakashi 0:8fdf9a60065b 116 }
kadonotakashi 0:8fdf9a60065b 117
kadonotakashi 0:8fdf9a60065b 118 // set PBR and BR
kadonotakashi 0:8fdf9a60065b 119 obj->spi->CTAR[0] &= ~(SPI_CTAR_PBR_MASK | SPI_CTAR_BR_MASK | SPI_CTAR_DBR_MASK);
kadonotakashi 0:8fdf9a60065b 120 obj->spi->CTAR[0] |= (ref_prescaler << SPI_CTAR_PBR_SHIFT) | (ref_spr << SPI_CTAR_BR_SHIFT) | (ref_dr << SPI_CTAR_DBR_SHIFT);
kadonotakashi 0:8fdf9a60065b 121 }
kadonotakashi 0:8fdf9a60065b 122
kadonotakashi 0:8fdf9a60065b 123 static inline int spi_writeable(spi_t *obj) {
kadonotakashi 0:8fdf9a60065b 124 return (obj->spi->SR & SPI_SR_TFFF_MASK) ? 1 : 0;
kadonotakashi 0:8fdf9a60065b 125 }
kadonotakashi 0:8fdf9a60065b 126
kadonotakashi 0:8fdf9a60065b 127 static inline int spi_readable(spi_t *obj) {
kadonotakashi 0:8fdf9a60065b 128 return (obj->spi->SR & SPI_SR_RFDF_MASK) ? 1 : 0;
kadonotakashi 0:8fdf9a60065b 129 }
kadonotakashi 0:8fdf9a60065b 130
kadonotakashi 0:8fdf9a60065b 131 int spi_master_write(spi_t *obj, int value) {
kadonotakashi 0:8fdf9a60065b 132 //clear RX buffer flag
kadonotakashi 0:8fdf9a60065b 133 obj->spi->SR |= SPI_SR_RFDF_MASK;
kadonotakashi 0:8fdf9a60065b 134 // wait tx buffer empty
kadonotakashi 0:8fdf9a60065b 135 while(!spi_writeable(obj));
kadonotakashi 0:8fdf9a60065b 136 obj->spi->PUSHR = SPI_PUSHR_TXDATA(value & 0xffff) /*| SPI_PUSHR_EOQ_MASK*/;
kadonotakashi 0:8fdf9a60065b 137
kadonotakashi 0:8fdf9a60065b 138 // wait rx buffer full
kadonotakashi 0:8fdf9a60065b 139 while (!spi_readable(obj));
kadonotakashi 0:8fdf9a60065b 140 return obj->spi->POPR;
kadonotakashi 0:8fdf9a60065b 141 }
kadonotakashi 0:8fdf9a60065b 142
kadonotakashi 0:8fdf9a60065b 143 int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length,
kadonotakashi 0:8fdf9a60065b 144 char *rx_buffer, int rx_length, char write_fill) {
kadonotakashi 0:8fdf9a60065b 145 int total = (tx_length > rx_length) ? tx_length : rx_length;
kadonotakashi 0:8fdf9a60065b 146
kadonotakashi 0:8fdf9a60065b 147 for (int i = 0; i < total; i++) {
kadonotakashi 0:8fdf9a60065b 148 char out = (i < tx_length) ? tx_buffer[i] : write_fill;
kadonotakashi 0:8fdf9a60065b 149 char in = spi_master_write(obj, out);
kadonotakashi 0:8fdf9a60065b 150 if (i < rx_length) {
kadonotakashi 0:8fdf9a60065b 151 rx_buffer[i] = in;
kadonotakashi 0:8fdf9a60065b 152 }
kadonotakashi 0:8fdf9a60065b 153 }
kadonotakashi 0:8fdf9a60065b 154
kadonotakashi 0:8fdf9a60065b 155 return total;
kadonotakashi 0:8fdf9a60065b 156 }
kadonotakashi 0:8fdf9a60065b 157
kadonotakashi 0:8fdf9a60065b 158 int spi_slave_receive(spi_t *obj) {
kadonotakashi 0:8fdf9a60065b 159 return spi_readable(obj);
kadonotakashi 0:8fdf9a60065b 160 }
kadonotakashi 0:8fdf9a60065b 161
kadonotakashi 0:8fdf9a60065b 162 int spi_slave_read(spi_t *obj) {
kadonotakashi 0:8fdf9a60065b 163 obj->spi->SR |= SPI_SR_RFDF_MASK;
kadonotakashi 0:8fdf9a60065b 164 return obj->spi->POPR;
kadonotakashi 0:8fdf9a60065b 165 }
kadonotakashi 0:8fdf9a60065b 166
kadonotakashi 0:8fdf9a60065b 167 void spi_slave_write(spi_t *obj, int value) {
kadonotakashi 0:8fdf9a60065b 168 while (!spi_writeable(obj));
kadonotakashi 0:8fdf9a60065b 169 }