Zakaria ElQotbi / mbed-src

mbed library sources for airmote

Fork of mbed-src by mbed official

targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/spi_api.c@300:55638feb26a4, 2014-08-27 (annotated)

Committer:
mbed_official
Date:
Wed Aug 27 08:45:06 2014 +0100
Revision:
300:55638feb26a4
Parent:
285:31249416b6f9
Child:
395:bfce16e86ea4
Synchronized with git revision 90467175c04ad81c20cdf7b2ddb86c54f5f3dcbb



Full URL: https://github.com/mbedmicro/mbed/commit/90467175c04ad81c20cdf7b2ddb86c54f5f3dcbb/

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 227:7bd0639b8911 17 #include "mbed_assert.h"
mbed_official 85:e1a8e879a6a9 18 #include "spi_api.h"
mbed_official 85:e1a8e879a6a9 19 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 20 #include "pinmap.h"
mbed_official 285:31249416b6f9 21 #include "mbed_error.h"
mbed_official 85:e1a8e879a6a9 22
mbed_official 85:e1a8e879a6a9 23 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 300:55638feb26a4 24 {SPI_PSELSCK0, SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 25 {SPI_PSELSCK1, SPI_1, 0x02},
mbed_official 227:7bd0639b8911 26 {SPIS_PSELSCK, SPIS, 0x03},
mbed_official 300:55638feb26a4 27 {NC, NC, 0}
mbed_official 85:e1a8e879a6a9 28 };
mbed_official 85:e1a8e879a6a9 29
mbed_official 85:e1a8e879a6a9 30 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 300:55638feb26a4 31 {SPI_PSELMOSI0, SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 32 {SPI_PSELMOSI1, SPI_1, 0x02},
mbed_official 85:e1a8e879a6a9 33 {SPIS_PSELMOSI, SPIS, 0x03},
mbed_official 300:55638feb26a4 34 {NC, NC, 0}
mbed_official 85:e1a8e879a6a9 35 };
mbed_official 85:e1a8e879a6a9 36
mbed_official 85:e1a8e879a6a9 37 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 300:55638feb26a4 38 {SPI_PSELMISO0, SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 39 {SPI_PSELMISO1, SPI_1, 0x02},
mbed_official 85:e1a8e879a6a9 40 {SPIS_PSELMISO, SPIS, 0x03},
mbed_official 300:55638feb26a4 41 {NC, NC, 0}
mbed_official 85:e1a8e879a6a9 42 };
mbed_official 85:e1a8e879a6a9 43
mbed_official 85:e1a8e879a6a9 44 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 85:e1a8e879a6a9 45 {SPIS_PSELSS, SPIS, 0x03},
mbed_official 300:55638feb26a4 46 {NC, NC, 0}
mbed_official 85:e1a8e879a6a9 47 };
mbed_official 85:e1a8e879a6a9 48 // {SPI_PSELSS0 , SPI_0, 0x01},
mbed_official 85:e1a8e879a6a9 49 #define SPIS_MESSAGE_SIZE 1
mbed_official 85:e1a8e879a6a9 50 volatile uint8_t m_tx_buf[SPIS_MESSAGE_SIZE] = {0};
mbed_official 85:e1a8e879a6a9 51 volatile uint8_t m_rx_buf[SPIS_MESSAGE_SIZE] = {0};
mbed_official 85:e1a8e879a6a9 52
mbed_official 85:e1a8e879a6a9 53
mbed_official 300:55638feb26a4 54 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 300:55638feb26a4 55 {
mbed_official 85:e1a8e879a6a9 56 // determine the SPI to use
mbed_official 85:e1a8e879a6a9 57 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 85:e1a8e879a6a9 58 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 85:e1a8e879a6a9 59 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 85:e1a8e879a6a9 60 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 85:e1a8e879a6a9 61 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 85:e1a8e879a6a9 62 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 300:55638feb26a4 63 SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 64 //SPIName
mbed_official 300:55638feb26a4 65 if (ssel==NC) {
mbed_official 300:55638feb26a4 66 obj->spi = (NRF_SPI_Type *)spi;
mbed_official 300:55638feb26a4 67 obj->spis = (NRF_SPIS_Type *)NC;
mbed_official 300:55638feb26a4 68 } else {
mbed_official 300:55638feb26a4 69 obj->spi = (NRF_SPI_Type *)NC;
mbed_official 300:55638feb26a4 70 obj->spis = (NRF_SPIS_Type *)spi;
mbed_official 85:e1a8e879a6a9 71 }
mbed_official 257:9258cc0a200d 72 MBED_ASSERT((int)obj->spi != NC || (int)obj->spis != NC);
mbed_official 227:7bd0639b8911 73
mbed_official 300:55638feb26a4 74 // pin out the spi pins
mbed_official 300:55638feb26a4 75 if (ssel != NC) { //slave
mbed_official 300:55638feb26a4 76 obj->spis->POWER = 0;
mbed_official 300:55638feb26a4 77 obj->spis->POWER = 1;
mbed_official 85:e1a8e879a6a9 78
mbed_official 85:e1a8e879a6a9 79 NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 80 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 81 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 82 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 83 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 84 NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 85 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 86 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 87 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 88 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 89 NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 90 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 91 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 92 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 93 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 94 NRF_GPIO->PIN_CNF[ssel] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 95 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 96 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 97 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 98 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 300:55638feb26a4 99
mbed_official 85:e1a8e879a6a9 100 obj->spis->PSELMOSI = mosi;
mbed_official 85:e1a8e879a6a9 101 obj->spis->PSELMISO = miso;
mbed_official 300:55638feb26a4 102 obj->spis->PSELSCK = sclk;
mbed_official 300:55638feb26a4 103 obj->spis->PSELCSN = ssel;
mbed_official 300:55638feb26a4 104
mbed_official 300:55638feb26a4 105 obj->spis->EVENTS_END = 0;
mbed_official 300:55638feb26a4 106 obj->spis->EVENTS_ACQUIRED = 0;
mbed_official 300:55638feb26a4 107 obj->spis->MAXRX = SPIS_MESSAGE_SIZE;
mbed_official 300:55638feb26a4 108 obj->spis->MAXTX = SPIS_MESSAGE_SIZE;
mbed_official 300:55638feb26a4 109 obj->spis->TXDPTR = (uint32_t)&m_tx_buf[0];
mbed_official 300:55638feb26a4 110 obj->spis->RXDPTR = (uint32_t)&m_rx_buf[0];
mbed_official 300:55638feb26a4 111 obj->spis->SHORTS = (SPIS_SHORTS_END_ACQUIRE_Enabled << SPIS_SHORTS_END_ACQUIRE_Pos);
mbed_official 85:e1a8e879a6a9 112
mbed_official 85:e1a8e879a6a9 113 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
mbed_official 300:55638feb26a4 114 } else { //master
mbed_official 300:55638feb26a4 115 obj->spi->POWER = 0;
mbed_official 300:55638feb26a4 116 obj->spi->POWER = 1;
mbed_official 300:55638feb26a4 117
mbed_official 227:7bd0639b8911 118 //NRF_GPIO->DIR |= (1<<mosi);
mbed_official 85:e1a8e879a6a9 119 NRF_GPIO->PIN_CNF[mosi] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 120 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 121 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 122 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 123 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 124 obj->spi->PSELMOSI = mosi;
mbed_official 300:55638feb26a4 125
mbed_official 85:e1a8e879a6a9 126 NRF_GPIO->PIN_CNF[sclk] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 127 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 128 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 129 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 130 | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 131 obj->spi->PSELSCK = sclk;
mbed_official 300:55638feb26a4 132
mbed_official 85:e1a8e879a6a9 133 //NRF_GPIO->DIR &= ~(1<<miso);
mbed_official 85:e1a8e879a6a9 134 NRF_GPIO->PIN_CNF[miso] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
mbed_official 85:e1a8e879a6a9 135 | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
mbed_official 85:e1a8e879a6a9 136 | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
mbed_official 85:e1a8e879a6a9 137 | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
mbed_official 85:e1a8e879a6a9 138 | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
mbed_official 85:e1a8e879a6a9 139
mbed_official 85:e1a8e879a6a9 140 obj->spi->PSELMISO = miso;
mbed_official 300:55638feb26a4 141
mbed_official 227:7bd0639b8911 142 obj->spi->EVENTS_READY = 0U;
mbed_official 85:e1a8e879a6a9 143
mbed_official 85:e1a8e879a6a9 144 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
mbed_official 227:7bd0639b8911 145 spi_frequency(obj, 1000000);
mbed_official 85:e1a8e879a6a9 146 }
mbed_official 300:55638feb26a4 147 }
mbed_official 300:55638feb26a4 148
mbed_official 300:55638feb26a4 149 void spi_free(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 150 }
mbed_official 85:e1a8e879a6a9 151
mbed_official 300:55638feb26a4 152 static inline void spi_disable(spi_t *obj, int slave)
mbed_official 300:55638feb26a4 153 {
mbed_official 300:55638feb26a4 154 if (slave) {
mbed_official 85:e1a8e879a6a9 155 obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Disabled << SPIS_ENABLE_ENABLE_Pos);
mbed_official 300:55638feb26a4 156 } else {
mbed_official 85:e1a8e879a6a9 157 obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 158 }
mbed_official 85:e1a8e879a6a9 159 }
mbed_official 85:e1a8e879a6a9 160
mbed_official 300:55638feb26a4 161 static inline void spi_enable(spi_t *obj, int slave)
mbed_official 300:55638feb26a4 162 {
mbed_official 300:55638feb26a4 163 if (slave) {
mbed_official 85:e1a8e879a6a9 164 obj->spis->ENABLE = (SPIS_ENABLE_ENABLE_Enabled << SPIS_ENABLE_ENABLE_Pos);
mbed_official 300:55638feb26a4 165 } else {
mbed_official 85:e1a8e879a6a9 166 obj->spi->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);
mbed_official 85:e1a8e879a6a9 167 }
mbed_official 85:e1a8e879a6a9 168 }
mbed_official 85:e1a8e879a6a9 169
mbed_official 300:55638feb26a4 170 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 300:55638feb26a4 171 {
mbed_official 209:137057ef9d1e 172 uint32_t config_mode = 0;
mbed_official 300:55638feb26a4 173 spi_disable(obj, slave);
mbed_official 300:55638feb26a4 174
mbed_official 85:e1a8e879a6a9 175 if (bits != 8) {
mbed_official 85:e1a8e879a6a9 176 error("Only 8bits SPI supported");
mbed_official 85:e1a8e879a6a9 177 }
mbed_official 300:55638feb26a4 178
mbed_official 300:55638feb26a4 179 switch (mode) {
mbed_official 85:e1a8e879a6a9 180 case 0:
mbed_official 300:55638feb26a4 181 config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 182 break;
mbed_official 85:e1a8e879a6a9 183 case 1:
mbed_official 85:e1a8e879a6a9 184 config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveHigh << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 185 break;
mbed_official 85:e1a8e879a6a9 186 case 2:
mbed_official 300:55638feb26a4 187 config_mode = (SPI_CONFIG_CPHA_Leading << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 188 break;
mbed_official 85:e1a8e879a6a9 189 case 3:
mbed_official 85:e1a8e879a6a9 190 config_mode = (SPI_CONFIG_CPHA_Trailing << SPI_CONFIG_CPHA_Pos) | (SPI_CONFIG_CPOL_ActiveLow << SPI_CONFIG_CPOL_Pos);
mbed_official 85:e1a8e879a6a9 191 break;
mbed_official 85:e1a8e879a6a9 192 default:
mbed_official 85:e1a8e879a6a9 193 error("SPI format error");
mbed_official 85:e1a8e879a6a9 194 break;
mbed_official 85:e1a8e879a6a9 195 }
mbed_official 85:e1a8e879a6a9 196 //default to msb first
mbed_official 300:55638feb26a4 197 if (slave) {
mbed_official 300:55638feb26a4 198 obj->spis->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos));
mbed_official 300:55638feb26a4 199 } else {
mbed_official 300:55638feb26a4 200 obj->spi->CONFIG = (config_mode | (SPI_CONFIG_ORDER_MsbFirst << SPI_CONFIG_ORDER_Pos));
mbed_official 85:e1a8e879a6a9 201 }
mbed_official 300:55638feb26a4 202
mbed_official 300:55638feb26a4 203 spi_enable(obj, slave);
mbed_official 85:e1a8e879a6a9 204 }
mbed_official 85:e1a8e879a6a9 205
mbed_official 300:55638feb26a4 206 void spi_frequency(spi_t *obj, int hz)
mbed_official 300:55638feb26a4 207 {
mbed_official 300:55638feb26a4 208 if ((int)obj->spi==NC) {
mbed_official 85:e1a8e879a6a9 209 return;
mbed_official 85:e1a8e879a6a9 210 }
mbed_official 300:55638feb26a4 211 spi_disable(obj, 0);
mbed_official 300:55638feb26a4 212
mbed_official 300:55638feb26a4 213 if (hz<250000) { //125Kbps
mbed_official 300:55638feb26a4 214 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K125;
mbed_official 300:55638feb26a4 215 } else if (hz<500000) { //250Kbps
mbed_official 300:55638feb26a4 216 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K250;
mbed_official 300:55638feb26a4 217 } else if (hz<1000000) { //500Kbps
mbed_official 85:e1a8e879a6a9 218 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_K500;
mbed_official 300:55638feb26a4 219 } else if (hz<2000000) { //1Mbps
mbed_official 85:e1a8e879a6a9 220 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M1;
mbed_official 300:55638feb26a4 221 } else if (hz<4000000) { //2Mbps
mbed_official 85:e1a8e879a6a9 222 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M2;
mbed_official 300:55638feb26a4 223 } else if (hz<8000000) { //4Mbps
mbed_official 85:e1a8e879a6a9 224 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M4;
mbed_official 300:55638feb26a4 225 } else { //8Mbps
mbed_official 227:7bd0639b8911 226 obj->spi->FREQUENCY = (uint32_t) SPI_FREQUENCY_FREQUENCY_M8;
mbed_official 85:e1a8e879a6a9 227 }
mbed_official 300:55638feb26a4 228
mbed_official 300:55638feb26a4 229 spi_enable(obj, 0);
mbed_official 85:e1a8e879a6a9 230 }
mbed_official 85:e1a8e879a6a9 231
mbed_official 300:55638feb26a4 232 static inline int spi_readable(spi_t *obj)
mbed_official 300:55638feb26a4 233 {
mbed_official 85:e1a8e879a6a9 234 return (obj->spi->EVENTS_READY == 1);
mbed_official 85:e1a8e879a6a9 235 }
mbed_official 85:e1a8e879a6a9 236
mbed_official 300:55638feb26a4 237 static inline int spi_writeable(spi_t *obj)
mbed_official 300:55638feb26a4 238 {
mbed_official 85:e1a8e879a6a9 239 return (obj->spi->EVENTS_READY == 0);
mbed_official 85:e1a8e879a6a9 240 }
mbed_official 85:e1a8e879a6a9 241
mbed_official 300:55638feb26a4 242 static inline int spi_read(spi_t *obj)
mbed_official 300:55638feb26a4 243 {
mbed_official 300:55638feb26a4 244 while (!spi_readable(obj)) {
mbed_official 300:55638feb26a4 245 }
mbed_official 85:e1a8e879a6a9 246
mbed_official 300:55638feb26a4 247 obj->spi->EVENTS_READY = 0;
mbed_official 85:e1a8e879a6a9 248 return (int)obj->spi->RXD;
mbed_official 85:e1a8e879a6a9 249 }
mbed_official 85:e1a8e879a6a9 250
mbed_official 300:55638feb26a4 251 int spi_master_write(spi_t *obj, int value)
mbed_official 300:55638feb26a4 252 {
mbed_official 300:55638feb26a4 253 while (!spi_writeable(obj)) {
mbed_official 85:e1a8e879a6a9 254 }
mbed_official 85:e1a8e879a6a9 255 obj->spi->TXD = (uint32_t)value;
mbed_official 85:e1a8e879a6a9 256 return spi_read(obj);
mbed_official 85:e1a8e879a6a9 257 }
mbed_official 85:e1a8e879a6a9 258
mbed_official 227:7bd0639b8911 259 //static inline int spis_writeable(spi_t *obj) {
mbed_official 85:e1a8e879a6a9 260 // return (obj->spis->EVENTS_ACQUIRED==1);
mbed_official 85:e1a8e879a6a9 261 //}
mbed_official 85:e1a8e879a6a9 262
mbed_official 300:55638feb26a4 263 int spi_slave_receive(spi_t *obj)
mbed_official 300:55638feb26a4 264 {
mbed_official 85:e1a8e879a6a9 265 return obj->spis->EVENTS_END;
mbed_official 300:55638feb26a4 266 }
mbed_official 85:e1a8e879a6a9 267
mbed_official 300:55638feb26a4 268 int spi_slave_read(spi_t *obj)
mbed_official 300:55638feb26a4 269 {
mbed_official 85:e1a8e879a6a9 270 return m_rx_buf[0];
mbed_official 85:e1a8e879a6a9 271 }
mbed_official 85:e1a8e879a6a9 272
mbed_official 300:55638feb26a4 273 void spi_slave_write(spi_t *obj, int value)
mbed_official 300:55638feb26a4 274 {
mbed_official 300:55638feb26a4 275 m_tx_buf[0] = value & 0xFF;
mbed_official 300:55638feb26a4 276 obj->spis->TASKS_RELEASE = 1;
mbed_official 300:55638feb26a4 277 obj->spis->EVENTS_ACQUIRED = 0;
mbed_official 300:55638feb26a4 278 obj->spis->EVENTS_END = 0;
mbed_official 85:e1a8e879a6a9 279 }