Zakaria ElQotbi / mbed-src

mbed library sources for airmote

Fork of mbed-src by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/spi_api.c@85:e1a8e879a6a9, 2014-02-07 (annotated)

Committer:
mbed_official
Date:
Fri Feb 07 18:00:11 2014 +0000
Revision:
85:e1a8e879a6a9
Child:
104:a6a92e2e5a92
Synchronized with git revision 4b2b368a6a3b1f0fd33d99917981c67436c4aebe



Full URL: https://github.com/mbedmicro/mbed/commit/4b2b368a6a3b1f0fd33d99917981c67436c4aebe/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 85:e1a8e879a6a9 3 *
mbed_official 85:e1a8e879a6a9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 85:e1a8e879a6a9 5 * you may not use this file except in compliance with the License.
mbed_official 85:e1a8e879a6a9 6 * You may obtain a copy of the License at
mbed_official 85:e1a8e879a6a9 7 *
mbed_official 85:e1a8e879a6a9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 85:e1a8e879a6a9 9 *
mbed_official 85:e1a8e879a6a9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 85:e1a8e879a6a9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 85:e1a8e879a6a9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 85:e1a8e879a6a9 13 * See the License for the specific language governing permissions and
mbed_official 85:e1a8e879a6a9 14 * limitations under the License.
mbed_official 85:e1a8e879a6a9 15 */
mbed_official 85:e1a8e879a6a9 16 //#include <math.h>
mbed_official 85:e1a8e879a6a9 17 #include "spi_api.h"
mbed_official 85:e1a8e879a6a9 18 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 19 #include "pinmap.h"
mbed_official 85:e1a8e879a6a9 20 #include "error.h"
mbed_official 85:e1a8e879a6a9 21
mbed_official 85:e1a8e879a6a9 22 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 85:e1a8e879a6a9 23 {SPI_PSELSCK0 , SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 24 {SPI_PSELSCK1, SPI_1, 0x02},
mbed_official 85:e1a8e879a6a9 25 {SPIS_PSELSCK, SPIS, 0x03},
mbed_official 85:e1a8e879a6a9 26 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 27 };
mbed_official 85:e1a8e879a6a9 28
mbed_official 85:e1a8e879a6a9 29 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 85:e1a8e879a6a9 30 {SPI_PSELMOSI0 , SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 31 {SPI_PSELMOSI1, SPI_1, 0x02},
mbed_official 85:e1a8e879a6a9 32 {SPIS_PSELMOSI, SPIS, 0x03},
mbed_official 85:e1a8e879a6a9 33 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 34 };
mbed_official 85:e1a8e879a6a9 35
mbed_official 85:e1a8e879a6a9 36 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 85:e1a8e879a6a9 37 {SPI_PSELMISO0 , SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 38 {SPI_PSELMISO1, SPI_1, 0x02},
mbed_official 85:e1a8e879a6a9 39 {SPIS_PSELMISO, SPIS, 0x03},
mbed_official 85:e1a8e879a6a9 40 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 41 };
mbed_official 85:e1a8e879a6a9 42
mbed_official 85:e1a8e879a6a9 43 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 85:e1a8e879a6a9 44 {SPIS_PSELSS, SPIS, 0x03},
mbed_official 85:e1a8e879a6a9 45 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 46 };
mbed_official 85:e1a8e879a6a9 47 // {SPI_PSELSS0 , SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 48 #define SPIS_MESSAGE_SIZE 1
mbed_official 85:e1a8e879a6a9 49 volatile uint8_t m_tx_buf[SPIS_MESSAGE_SIZE] = {0};
mbed_official 85:e1a8e879a6a9 50 volatile uint8_t m_rx_buf[SPIS_MESSAGE_SIZE] = {0};
mbed_official 85:e1a8e879a6a9 51
mbed_official 85:e1a8e879a6a9 52
mbed_official 85:e1a8e879a6a9 53 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 85:e1a8e879a6a9 54 // determine the SPI to use
mbed_official 85:e1a8e879a6a9 55 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 85:e1a8e879a6a9 56 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 85:e1a8e879a6a9 57 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 85:e1a8e879a6a9 58 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 85:e1a8e879a6a9 59 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 85:e1a8e879a6a9 60 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 85:e1a8e879a6a9 61 SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 85:e1a8e879a6a9 62 //SPIName
mbed_official 85:e1a8e879a6a9 63 if(ssel==NC){
mbed_official 85:e1a8e879a6a9 64 obj->spi = (NRF_SPI_Type*)spi;
mbed_official 85:e1a8e879a6a9 65 obj->spis = (NRF_SPIS_Type*)NC;
mbed_official 85:e1a8e879a6a9 66 }
mbed_official 85:e1a8e879a6a9 67 else{
mbed_official 85:e1a8e879a6a9 68 obj->spi = (NRF_SPI_Type*)NC;
mbed_official 85:e1a8e879a6a9 69 obj->spis = (NRF_SPIS_Type*)spi;
mbed_official 85:e1a8e879a6a9 70 }
mbed_official 85:e1a8e879a6a9 71
mbed_official 85:e1a8e879a6a9 72 if ((int)obj->spi == NC && (int)obj->spis == NC) {
mbed_official 85:e1a8e879a6a9 73 error("SPI pinout mapping failed");
mbed_official 85:e1a8e879a6a9 74 }
mbed_official 85:e1a8e879a6a9 75 // pin out the spi pins
mbed_official 85:e1a8e879a6a9 76 if (ssel != NC) {//slave
mbed_official 85:e1a8e879a6a9 77 obj->spis->POWER=0;
mbed_official 85:e1a8e879a6a9 78 obj->spis->POWER=1;
mbed_official 85:e1a8e879a6a9 79
mbed_official 85:e1a8e879a6a9 80 NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 81 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 82 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 83 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 84 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 85 NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 86 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 87 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 88 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 89 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 90 NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 91 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 92 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 93 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 94 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 95 NRF_GPIO->PIN_CNF[ssel] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 96 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 97 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 98 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 99 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 100
mbed_official 85:e1a8e879a6a9 101 obj->spis->PSELMOSI = mosi;
mbed_official 85:e1a8e879a6a9 102 obj->spis->PSELMISO = miso;
mbed_official 85:e1a8e879a6a9 103 obj->spis->PSELSCK = sclk;
mbed_official 85:e1a8e879a6a9 104 obj->spis->PSELCSN = ssel;
mbed_official 85:e1a8e879a6a9 105
mbed_official 85:e1a8e879a6a9 106 obj->spis->EVENTS_END=0;
mbed_official 85:e1a8e879a6a9 107 obj->spis->EVENTS_ACQUIRED=0;
mbed_official 85:e1a8e879a6a9 108 obj->spis->MAXRX=SPIS_MESSAGE_SIZE;
mbed_official 85:e1a8e879a6a9 109 obj->spis->MAXTX=SPIS_MESSAGE_SIZE;
mbed_official 85:e1a8e879a6a9 110 obj->spis->TXDPTR = (uint32_t)&m_tx_buf[0];
mbed_official 85:e1a8e879a6a9 111 obj->spis->RXDPTR = (uint32_t)&m_rx_buf[0];
mbed_official 85:e1a8e879a6a9 112 obj->spis->SHORTS = (SPIS_SHORTS_END_ACQUIRE_Enabled<<SPIS_SHORTS_END_ACQUIRE_Pos);
mbed_official 85:e1a8e879a6a9 113
mbed_official 85:e1a8e879a6a9 114 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
mbed_official 85:e1a8e879a6a9 115 }
mbed_official 85:e1a8e879a6a9 116 else{//master
mbed_official 85:e1a8e879a6a9 117 obj->spi->POWER=0;
mbed_official 85:e1a8e879a6a9 118 obj->spi->POWER=1;
mbed_official 85:e1a8e879a6a9 119
mbed_official 85:e1a8e879a6a9 120 //NRF_GPIO->DIR |= (1<<mosi);
mbed_official 85:e1a8e879a6a9 121 NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 122 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 123 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 124 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 125 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 126 obj->spi->PSELMOSI = mosi;
mbed_official 85:e1a8e879a6a9 127
mbed_official 85:e1a8e879a6a9 128 NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 129 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 130 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 131 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 132 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 133 obj->spi->PSELSCK = sclk;
mbed_official 85:e1a8e879a6a9 134
mbed_official 85:e1a8e879a6a9 135 //NRF_GPIO->DIR &= ~(1<<miso);
mbed_official 85:e1a8e879a6a9 136 NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 137 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 138 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 139 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 140 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 141
mbed_official 85:e1a8e879a6a9 142 obj->spi->PSELMISO = miso;
mbed_official 85:e1a8e879a6a9 143
mbed_official 85:e1a8e879a6a9 144 obj->spi->EVENTS_READY = 0U;
mbed_official 85:e1a8e879a6a9 145
mbed_official 85:e1a8e879a6a9 146 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
mbed_official 85:e1a8e879a6a9 147 spi_frequency(obj, 1000000);
mbed_official 85:e1a8e879a6a9 148 }
mbed_official 85:e1a8e879a6a9 149
mbed_official 85:e1a8e879a6a9 150 }
mbed_official 85:e1a8e879a6a9 151
mbed_official 85:e1a8e879a6a9 152 void spi_free(spi_t *obj) {}
mbed_official 85:e1a8e879a6a9 153
mbed_official 85:e1a8e879a6a9 154 static inline void spi_disable(spi_t *obj, int slave) {
mbed_official 85:e1a8e879a6a9 155 if(slave){
mbed_official 85:e1a8e879a6a9 156 obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Disabled << SPIS_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 157 }
mbed_official 85:e1a8e879a6a9 158 else{
mbed_official 85:e1a8e879a6a9 159 obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 160 }
mbed_official 85:e1a8e879a6a9 161 }
mbed_official 85:e1a8e879a6a9 162
mbed_official 85:e1a8e879a6a9 163 static inline void spi_enable(spi_t *obj, int slave) {
mbed_official 85:e1a8e879a6a9 164 if(slave){
mbed_official 85:e1a8e879a6a9 165 obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Enabled << SPIS_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 166 }
mbed_official 85:e1a8e879a6a9 167 else{
mbed_official 85:e1a8e879a6a9 168 obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 169 }
mbed_official 85:e1a8e879a6a9 170 }
mbed_official 85:e1a8e879a6a9 171
mbed_official 85:e1a8e879a6a9 172 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 85:e1a8e879a6a9 173 uint32_t config_mode;
mbed_official 85:e1a8e879a6a9 174 spi_disable(obj,slave);
mbed_official 85:e1a8e879a6a9 175
mbed_official 85:e1a8e879a6a9 176 if (bits != 8) {
mbed_official 85:e1a8e879a6a9 177 error("Only 8bits SPI supported");
mbed_official 85:e1a8e879a6a9 178 }
mbed_official 85:e1a8e879a6a9 179
mbed_official 85:e1a8e879a6a9 180 switch (mode)
mbed_official 85:e1a8e879a6a9 181 {
mbed_official 85:e1a8e879a6a9 182 case 0:
mbed_official 85:e1a8e879a6a9 183 config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 184 break;
mbed_official 85:e1a8e879a6a9 185 case 1:
mbed_official 85:e1a8e879a6a9 186 config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 187 break;
mbed_official 85:e1a8e879a6a9 188 case 2:
mbed_official 85:e1a8e879a6a9 189 config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 190 break;
mbed_official 85:e1a8e879a6a9 191 case 3:
mbed_official 85:e1a8e879a6a9 192 config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 193 break;
mbed_official 85:e1a8e879a6a9 194 default:
mbed_official 85:e1a8e879a6a9 195 error("SPI format error");
mbed_official 85:e1a8e879a6a9 196 break;
mbed_official 85:e1a8e879a6a9 197 }
mbed_official 85:e1a8e879a6a9 198 //default to msb first
mbed_official 85:e1a8e879a6a9 199 if(slave){
mbed_official 85:e1a8e879a6a9 200 obj->spis->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos) );
mbed_official 85:e1a8e879a6a9 201 }
mbed_official 85:e1a8e879a6a9 202 else{
mbed_official 85:e1a8e879a6a9 203 obj->spi->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos) );
mbed_official 85:e1a8e879a6a9 204 }
mbed_official 85:e1a8e879a6a9 205
mbed_official 85:e1a8e879a6a9 206 spi_enable(obj,slave);
mbed_official 85:e1a8e879a6a9 207 }
mbed_official 85:e1a8e879a6a9 208
mbed_official 85:e1a8e879a6a9 209 void spi_frequency(spi_t *obj, int hz) {
mbed_official 85:e1a8e879a6a9 210 if((int)obj->spi==NC)
mbed_official 85:e1a8e879a6a9 211 return;
mbed_official 85:e1a8e879a6a9 212 spi_disable(obj,0);
mbed_official 85:e1a8e879a6a9 213
mbed_official 85:e1a8e879a6a9 214 if(hz<250000) { //125Kbps
mbed_official 85:e1a8e879a6a9 215 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K125;
mbed_official 85:e1a8e879a6a9 216 }
mbed_official 85:e1a8e879a6a9 217 else if(hz<500000){//250Kbps
mbed_official 85:e1a8e879a6a9 218 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K250;
mbed_official 85:e1a8e879a6a9 219 }
mbed_official 85:e1a8e879a6a9 220 else if(hz<1000000){//500Kbps
mbed_official 85:e1a8e879a6a9 221 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K500;
mbed_official 85:e1a8e879a6a9 222 }
mbed_official 85:e1a8e879a6a9 223 else if(hz<2000000){//1Mbps
mbed_official 85:e1a8e879a6a9 224 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M1;
mbed_official 85:e1a8e879a6a9 225 }
mbed_official 85:e1a8e879a6a9 226 else if(hz<4000000){//2Mbps
mbed_official 85:e1a8e879a6a9 227 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M2;
mbed_official 85:e1a8e879a6a9 228 }
mbed_official 85:e1a8e879a6a9 229 else if(hz<8000000){//4Mbps
mbed_official 85:e1a8e879a6a9 230 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M4;
mbed_official 85:e1a8e879a6a9 231 }
mbed_official 85:e1a8e879a6a9 232 else{//8Mbps
mbed_official 85:e1a8e879a6a9 233 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M8;
mbed_official 85:e1a8e879a6a9 234 }
mbed_official 85:e1a8e879a6a9 235
mbed_official 85:e1a8e879a6a9 236 spi_enable(obj,0);
mbed_official 85:e1a8e879a6a9 237 }
mbed_official 85:e1a8e879a6a9 238
mbed_official 85:e1a8e879a6a9 239 static inline int spi_readable(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 240 return (obj->spi->EVENTS_READY == 1);
mbed_official 85:e1a8e879a6a9 241 }
mbed_official 85:e1a8e879a6a9 242
mbed_official 85:e1a8e879a6a9 243 static inline int spi_writeable(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 244 return (obj->spi->EVENTS_READY == 0);
mbed_official 85:e1a8e879a6a9 245 }
mbed_official 85:e1a8e879a6a9 246
mbed_official 85:e1a8e879a6a9 247
mbed_official 85:e1a8e879a6a9 248 static inline int spi_read(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 249 while (!spi_readable(obj)){
mbed_official 85:e1a8e879a6a9 250 }
mbed_official 85:e1a8e879a6a9 251
mbed_official 85:e1a8e879a6a9 252 obj->spi->EVENTS_READY =0;
mbed_official 85:e1a8e879a6a9 253 return (int)obj->spi->RXD;
mbed_official 85:e1a8e879a6a9 254 }
mbed_official 85:e1a8e879a6a9 255
mbed_official 85:e1a8e879a6a9 256 int spi_master_write(spi_t *obj, int value) {
mbed_official 85:e1a8e879a6a9 257 while (!spi_writeable(obj)){
mbed_official 85:e1a8e879a6a9 258 }
mbed_official 85:e1a8e879a6a9 259 obj->spi->TXD = (uint32_t)value;
mbed_official 85:e1a8e879a6a9 260 return spi_read(obj);
mbed_official 85:e1a8e879a6a9 261 }
mbed_official 85:e1a8e879a6a9 262
mbed_official 85:e1a8e879a6a9 263 //static inline int spis_writeable(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 264 // return (obj->spis->EVENTS_ACQUIRED==1);
mbed_official 85:e1a8e879a6a9 265 //}
mbed_official 85:e1a8e879a6a9 266
mbed_official 85:e1a8e879a6a9 267 int spi_slave_receive(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 268 return obj->spis->EVENTS_END;
mbed_official 85:e1a8e879a6a9 269 };
mbed_official 85:e1a8e879a6a9 270
mbed_official 85:e1a8e879a6a9 271 int spi_slave_read(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 272 return m_rx_buf[0];
mbed_official 85:e1a8e879a6a9 273 }
mbed_official 85:e1a8e879a6a9 274
mbed_official 85:e1a8e879a6a9 275 void spi_slave_write(spi_t *obj, int value) {
mbed_official 85:e1a8e879a6a9 276 m_tx_buf[0]= value & 0xFF;
mbed_official 85:e1a8e879a6a9 277 obj->spis->TASKS_RELEASE=1;
mbed_official 85:e1a8e879a6a9 278 obj->spis->EVENTS_ACQUIRED=0;
mbed_official 85:e1a8e879a6a9 279 obj->spis->EVENTS_END=0;
mbed_official 85:e1a8e879a6a9 280 }