Sean Houlihane / Mbed 2 deprecated SPI_Demo_Nano

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

Dependents:   SPI_GFX_nano

Fork of SPI_Demo_Nano by RedBearLab

spi_master.cpp@0:5810870d2b29, 2014-10-22 (annotated)

Committer:
RedBearLab
Date:
Wed Oct 22 05:08:52 2014 +0000
Revision:
0:5810870d2b29
First commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RedBearLab 0:5810870d2b29 1 /*
RedBearLab 0:5810870d2b29 2
RedBearLab 0:5810870d2b29 3 Copyright (c) 2012-2014 RedBearLab
RedBearLab 0:5810870d2b29 4
RedBearLab 0:5810870d2b29 5 Permission is hereby granted, free of charge, to any person obtaining a copy of this software
RedBearLab 0:5810870d2b29 6 and associated documentation files (the "Software"), to deal in the Software without restriction,
RedBearLab 0:5810870d2b29 7 including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
RedBearLab 0:5810870d2b29 8 and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
RedBearLab 0:5810870d2b29 9 subject to the following conditions:
RedBearLab 0:5810870d2b29 10 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
RedBearLab 0:5810870d2b29 11
RedBearLab 0:5810870d2b29 12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
RedBearLab 0:5810870d2b29 13 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
RedBearLab 0:5810870d2b29 14 PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
RedBearLab 0:5810870d2b29 15 FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
RedBearLab 0:5810870d2b29 16 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
RedBearLab 0:5810870d2b29 17
RedBearLab 0:5810870d2b29 18 */
RedBearLab 0:5810870d2b29 19
RedBearLab 0:5810870d2b29 20 #include "spi_master.h"
RedBearLab 0:5810870d2b29 21
RedBearLab 0:5810870d2b29 22 /**********************************************************************
RedBearLab 0:5810870d2b29 23 name :
RedBearLab 0:5810870d2b29 24 function :
RedBearLab 0:5810870d2b29 25 **********************************************************************/
RedBearLab 0:5810870d2b29 26 SPIClass::SPIClass(NRF_SPI_Type *_spi) : spi(_spi)
RedBearLab 0:5810870d2b29 27 {
RedBearLab 0:5810870d2b29 28 //do nothing
RedBearLab 0:5810870d2b29 29 }
RedBearLab 0:5810870d2b29 30
RedBearLab 0:5810870d2b29 31 /**********************************************************************
RedBearLab 0:5810870d2b29 32 name :
RedBearLab 0:5810870d2b29 33 function :
RedBearLab 0:5810870d2b29 34 **********************************************************************/
RedBearLab 0:5810870d2b29 35 void SPIClass::setCPOL( bool active_low)
RedBearLab 0:5810870d2b29 36 {
RedBearLab 0:5810870d2b29 37 if(active_low)
RedBearLab 0:5810870d2b29 38 {
RedBearLab 0:5810870d2b29 39 spi->CONFIG |= (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
RedBearLab 0:5810870d2b29 40 }
RedBearLab 0:5810870d2b29 41 else
RedBearLab 0:5810870d2b29 42 {
RedBearLab 0:5810870d2b29 43 spi->CONFIG |= (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
RedBearLab 0:5810870d2b29 44 }
RedBearLab 0:5810870d2b29 45 }
RedBearLab 0:5810870d2b29 46
RedBearLab 0:5810870d2b29 47 /**********************************************************************
RedBearLab 0:5810870d2b29 48 name :
RedBearLab 0:5810870d2b29 49 function :
RedBearLab 0:5810870d2b29 50 **********************************************************************/
RedBearLab 0:5810870d2b29 51 void SPIClass::setCPHA( bool trailing)
RedBearLab 0:5810870d2b29 52 {
RedBearLab 0:5810870d2b29 53 if(trailing)
RedBearLab 0:5810870d2b29 54 {
RedBearLab 0:5810870d2b29 55 spi->CONFIG |= (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos);
RedBearLab 0:5810870d2b29 56 }
RedBearLab 0:5810870d2b29 57 else
RedBearLab 0:5810870d2b29 58 {
RedBearLab 0:5810870d2b29 59 spi->CONFIG |= (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos);
RedBearLab 0:5810870d2b29 60 }
RedBearLab 0:5810870d2b29 61
RedBearLab 0:5810870d2b29 62 }
RedBearLab 0:5810870d2b29 63
RedBearLab 0:5810870d2b29 64 /**********************************************************************
RedBearLab 0:5810870d2b29 65 name :
RedBearLab 0:5810870d2b29 66 function : MSBFIRST, LSBFIRST
RedBearLab 0:5810870d2b29 67 **********************************************************************/
RedBearLab 0:5810870d2b29 68 void SPIClass::setBitORDER( BitOrder bit)
RedBearLab 0:5810870d2b29 69 {
RedBearLab 0:5810870d2b29 70 if(bit == MSBFIRST)
RedBearLab 0:5810870d2b29 71 {
RedBearLab 0:5810870d2b29 72 spi->CONFIG |= (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos);
RedBearLab 0:5810870d2b29 73 }
RedBearLab 0:5810870d2b29 74 else
RedBearLab 0:5810870d2b29 75 {
RedBearLab 0:5810870d2b29 76 spi->CONFIG |= (SPI_CONFIG_ORDER_LsbFirst << SPI_CONFIG_ORDER_Pos);
RedBearLab 0:5810870d2b29 77 }
RedBearLab 0:5810870d2b29 78 }
RedBearLab 0:5810870d2b29 79
RedBearLab 0:5810870d2b29 80 /**********************************************************************
RedBearLab 0:5810870d2b29 81 name :
RedBearLab 0:5810870d2b29 82 function :
RedBearLab 0:5810870d2b29 83 **********************************************************************/
RedBearLab 0:5810870d2b29 84 void SPIClass::setFrequency(uint8_t speed)
RedBearLab 0:5810870d2b29 85 {
RedBearLab 0:5810870d2b29 86 if (speed == 0)
RedBearLab 0:5810870d2b29 87 {
RedBearLab 0:5810870d2b29 88 spi->FREQUENCY = SPI_FREQUENCY_125K;
RedBearLab 0:5810870d2b29 89 }
RedBearLab 0:5810870d2b29 90 else if (speed == 1)
RedBearLab 0:5810870d2b29 91 {
RedBearLab 0:5810870d2b29 92 spi->FREQUENCY = SPI_FREQUENCY_250K;
RedBearLab 0:5810870d2b29 93 }
RedBearLab 0:5810870d2b29 94 else if (speed == 2)
RedBearLab 0:5810870d2b29 95 {
RedBearLab 0:5810870d2b29 96 spi->FREQUENCY = SPI_FREQUENCY_500K;
RedBearLab 0:5810870d2b29 97 }
RedBearLab 0:5810870d2b29 98 else if (speed == 3)
RedBearLab 0:5810870d2b29 99 {
RedBearLab 0:5810870d2b29 100 spi->FREQUENCY = SPI_FREQUENCY_1M;
RedBearLab 0:5810870d2b29 101 }
RedBearLab 0:5810870d2b29 102 else if (speed == 4)
RedBearLab 0:5810870d2b29 103 {
RedBearLab 0:5810870d2b29 104 spi->FREQUENCY = SPI_FREQUENCY_2M;
RedBearLab 0:5810870d2b29 105 }
RedBearLab 0:5810870d2b29 106 else if (speed == 5)
RedBearLab 0:5810870d2b29 107 {
RedBearLab 0:5810870d2b29 108 spi->FREQUENCY = SPI_FREQUENCY_4M;
RedBearLab 0:5810870d2b29 109 }
RedBearLab 0:5810870d2b29 110 else if (speed == 6)
RedBearLab 0:5810870d2b29 111 {
RedBearLab 0:5810870d2b29 112 spi->FREQUENCY = SPI_FREQUENCY_8M;
RedBearLab 0:5810870d2b29 113 }
RedBearLab 0:5810870d2b29 114 else
RedBearLab 0:5810870d2b29 115 {
RedBearLab 0:5810870d2b29 116 spi->FREQUENCY = SPI_FREQUENCY_4M;
RedBearLab 0:5810870d2b29 117 }
RedBearLab 0:5810870d2b29 118 }
RedBearLab 0:5810870d2b29 119
RedBearLab 0:5810870d2b29 120 /**********************************************************************
RedBearLab 0:5810870d2b29 121 name :
RedBearLab 0:5810870d2b29 122 function :
RedBearLab 0:5810870d2b29 123 **********************************************************************/
RedBearLab 0:5810870d2b29 124 void SPIClass::setSPIMode( uint8_t mode )
RedBearLab 0:5810870d2b29 125 {
RedBearLab 0:5810870d2b29 126 if (SPI_MODE0 == mode)
RedBearLab 0:5810870d2b29 127 {
RedBearLab 0:5810870d2b29 128 setCPOL(0);
RedBearLab 0:5810870d2b29 129 setCPHA(0);
RedBearLab 0:5810870d2b29 130 }
RedBearLab 0:5810870d2b29 131 else if (mode == SPI_MODE1)
RedBearLab 0:5810870d2b29 132 {
RedBearLab 0:5810870d2b29 133 setCPOL(0);
RedBearLab 0:5810870d2b29 134 setCPHA(1);
RedBearLab 0:5810870d2b29 135 }
RedBearLab 0:5810870d2b29 136 else if (mode == SPI_MODE2)
RedBearLab 0:5810870d2b29 137 {
RedBearLab 0:5810870d2b29 138 setCPOL(1);
RedBearLab 0:5810870d2b29 139 setCPHA(0);
RedBearLab 0:5810870d2b29 140 }
RedBearLab 0:5810870d2b29 141 else if (mode == SPI_MODE3)
RedBearLab 0:5810870d2b29 142 {
RedBearLab 0:5810870d2b29 143 setCPOL(1);
RedBearLab 0:5810870d2b29 144 setCPHA(1);
RedBearLab 0:5810870d2b29 145 }
RedBearLab 0:5810870d2b29 146 else
RedBearLab 0:5810870d2b29 147 {
RedBearLab 0:5810870d2b29 148 setCPOL(0);
RedBearLab 0:5810870d2b29 149 setCPHA(0);
RedBearLab 0:5810870d2b29 150 }
RedBearLab 0:5810870d2b29 151 }
RedBearLab 0:5810870d2b29 152
RedBearLab 0:5810870d2b29 153 /**********************************************************************
RedBearLab 0:5810870d2b29 154 name :
RedBearLab 0:5810870d2b29 155 function :
RedBearLab 0:5810870d2b29 156 **********************************************************************/
RedBearLab 0:5810870d2b29 157 void SPIClass::begin(uint32_t sck, uint32_t mosi, uint32_t miso)
RedBearLab 0:5810870d2b29 158 {
RedBearLab 0:5810870d2b29 159
RedBearLab 0:5810870d2b29 160 SCK_Pin = sck;
RedBearLab 0:5810870d2b29 161 MOSI_Pin = mosi;
RedBearLab 0:5810870d2b29 162 MISO_Pin = miso;
RedBearLab 0:5810870d2b29 163
RedBearLab 0:5810870d2b29 164 NRF_GPIO->PIN_CNF[SCK_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
RedBearLab 0:5810870d2b29 165 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
RedBearLab 0:5810870d2b29 166 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
RedBearLab 0:5810870d2b29 167 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
RedBearLab 0:5810870d2b29 168 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
RedBearLab 0:5810870d2b29 169
RedBearLab 0:5810870d2b29 170 NRF_GPIO->PIN_CNF[MOSI_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
RedBearLab 0:5810870d2b29 171 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
RedBearLab 0:5810870d2b29 172 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
RedBearLab 0:5810870d2b29 173 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
RedBearLab 0:5810870d2b29 174 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
RedBearLab 0:5810870d2b29 175
RedBearLab 0:5810870d2b29 176 NRF_GPIO->PIN_CNF[MISO_Pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
RedBearLab 0:5810870d2b29 177 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
RedBearLab 0:5810870d2b29 178 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
RedBearLab 0:5810870d2b29 179 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
RedBearLab 0:5810870d2b29 180 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
RedBearLab 0:5810870d2b29 181 spi->PSELSCK = SCK_Pin;
RedBearLab 0:5810870d2b29 182 spi->PSELMOSI = MOSI_Pin;
RedBearLab 0:5810870d2b29 183 spi->PSELMISO = MISO_Pin;
RedBearLab 0:5810870d2b29 184
RedBearLab 0:5810870d2b29 185 setFrequency(SPI_2M);
RedBearLab 0:5810870d2b29 186 setSPIMode(SPI_MODE0);
RedBearLab 0:5810870d2b29 187 setBitORDER(MSBFIRST);
RedBearLab 0:5810870d2b29 188
RedBearLab 0:5810870d2b29 189 spi->EVENTS_READY = 0;
RedBearLab 0:5810870d2b29 190 spi->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);
RedBearLab 0:5810870d2b29 191
RedBearLab 0:5810870d2b29 192 }
RedBearLab 0:5810870d2b29 193
RedBearLab 0:5810870d2b29 194 /**********************************************************************
RedBearLab 0:5810870d2b29 195 name :
RedBearLab 0:5810870d2b29 196 function :
RedBearLab 0:5810870d2b29 197 **********************************************************************/
RedBearLab 0:5810870d2b29 198 void SPIClass::begin()
RedBearLab 0:5810870d2b29 199 {
RedBearLab 0:5810870d2b29 200 begin(SCK, MOSI, MISO);
RedBearLab 0:5810870d2b29 201 }
RedBearLab 0:5810870d2b29 202
RedBearLab 0:5810870d2b29 203 /**********************************************************************
RedBearLab 0:5810870d2b29 204 name :
RedBearLab 0:5810870d2b29 205 function :
RedBearLab 0:5810870d2b29 206 **********************************************************************/
RedBearLab 0:5810870d2b29 207 uint8_t SPIClass::transfer(uint8_t data)
RedBearLab 0:5810870d2b29 208 {
RedBearLab 0:5810870d2b29 209 while( spi->EVENTS_READY != 0U );
RedBearLab 0:5810870d2b29 210
RedBearLab 0:5810870d2b29 211 spi->TXD = (uint32_t)data;
RedBearLab 0:5810870d2b29 212
RedBearLab 0:5810870d2b29 213 while(spi->EVENTS_READY == 0);
RedBearLab 0:5810870d2b29 214
RedBearLab 0:5810870d2b29 215 data = (uint8_t)spi->RXD;
RedBearLab 0:5810870d2b29 216
RedBearLab 0:5810870d2b29 217 spi->EVENTS_READY = 0;
RedBearLab 0:5810870d2b29 218
RedBearLab 0:5810870d2b29 219 return data;
RedBearLab 0:5810870d2b29 220 }
RedBearLab 0:5810870d2b29 221
RedBearLab 0:5810870d2b29 222 /**********************************************************************
RedBearLab 0:5810870d2b29 223 name :
RedBearLab 0:5810870d2b29 224 function :
RedBearLab 0:5810870d2b29 225 **********************************************************************/
RedBearLab 0:5810870d2b29 226 void SPIClass::endTransfer()
RedBearLab 0:5810870d2b29 227 {
RedBearLab 0:5810870d2b29 228 spi->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
RedBearLab 0:5810870d2b29 229 }
RedBearLab 0:5810870d2b29 230
RedBearLab 0:5810870d2b29 231 /**********************************************************************
RedBearLab 0:5810870d2b29 232 name :
RedBearLab 0:5810870d2b29 233 function :
RedBearLab 0:5810870d2b29 234 **********************************************************************/
RedBearLab 0:5810870d2b29 235
RedBearLab 0:5810870d2b29 236 //SPIClass SPI(NRF_SPI1);