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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/spi_api.c@209:137057ef9d1e, 2014-05-23 (annotated)

Committer:
mbed_official
Date:
Fri May 23 11:30:06 2014 +0100
Revision:
209:137057ef9d1e
Parent:
104:a6a92e2e5a92
Child:
227:7bd0639b8911
Synchronized with git revision f2b4c367e8b91e5b6acdf0058629d801456269a2



Full URL: https://github.com/mbedmicro/mbed/commit/f2b4c367e8b91e5b6acdf0058629d801456269a2/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 104:a6a92e2e5a92 2 * Copyright (c) 2013 Nordic Semiconductor
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 209:137057ef9d1e 173 uint32_t config_mode = 0;
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 }