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Diffstat (limited to 'core/comm/HardwareSPI.cpp')
| -rw-r--r-- | core/comm/HardwareSPI.cpp | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/core/comm/HardwareSPI.cpp b/core/comm/HardwareSPI.cpp deleted file mode 100644 index 51093cb..0000000 --- a/core/comm/HardwareSPI.cpp +++ /dev/null @@ -1,138 +0,0 @@ -/* ***************************************************************************** - * The MIT License - * - * Copyright (c) 2010 Perry Hung. - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - * ****************************************************************************/ - -/** - * @brief HardwareSPI "wiring-like" api for SPI - */ - -/* NOTES: - * - * Speeds: - * ----------------------------------- - * Interface num: SPI1 SPI2 - * Bus APB2 APB1 - * ----------------------------------- - * Prescaler Frequencies - * ----------------------------------- - * 2: N/A 18 000 000 - * 4: 18 000 000 9 000 000 - * 8: 9 000 000 4 500 000 - * 16: 4 500 000 2 250 000 - * 32: 2 250 000 1 125 000 - * 64: 1 125 000 562 500 - * 128: 562 500 281 250 - * 256: 281 250 140 625 - * - * TODO: Do the complementary PWM outputs mess up SPI2? - * */ - -#include "wiring.h" -#include "spi.h" -#include "HardwareSPI.h" - -static const uint32 prescaleFactors[MAX_SPI_FREQS] = { - SPI_PRESCALE_2, // SPI_18MHZ - SPI_PRESCALE_4, // SPI_9MHZ - SPI_PRESCALE_8, // SPI_4_5MHZ - SPI_PRESCALE_16, // SPI_2_25MHZ - SPI_PRESCALE_32, // SPI_1_125MHZ - SPI_PRESCALE_64, // SPI_562_500KHZ - SPI_PRESCALE_128, // SPI_281_250KHZ - SPI_PRESCALE_256, // SPI_140_625KHZ -}; - -/** - * @brief Initialize a SPI peripheral - * @param freq frequency to run at, must one of the following values: - * - SPI_18MHZ - * - SPI_9MHZ - * - SPI_4_5MHZ - * - SPI_2_25MHZ - * - SPI_1_125MHZ - * - SPI_562_500KHZ - * - SPI_281_250KHZ - * - SPI_140_625KHZ - * @param endianness endianness of the data frame, must be either LSBFIRST - * or MSBFIRST - * @param mode SPI standard CPOL and CPHA levels - */ -void HardwareSPI::begin(SPIFrequency freq, uint32 endianness, uint32 mode) { - uint32 spi_num = this->spi_num; - uint32 high_speed = 0; - uint32 index; - uint32 prescale; - - if ((freq >= MAX_SPI_FREQS) || - !((endianness == LSBFIRST) || - (endianness == MSBFIRST)) || - (mode >= 4)) { - return; - } - - if (spi_num == 1) { - /* SPI1 is too fast for 140625 */ - if (freq == SPI_140_625KHZ) { - return; - } - - /* Turn off PWM on shared pins */ - timers_disable_channel(3, 2); - timers_disable_channel(3, 1); - } - - endianness = (endianness == LSBFIRST) ? SPI_LSBFIRST : SPI_MSBFIRST; - prescale = (spi_num == 1) ? prescaleFactors[freq + 1] : prescaleFactors[freq]; - - spi_init(spi_num, prescale, endianness, 0); -} - -/** - * @brief Initialize a SPI peripheral with a default speed of 1.125 MHZ, MSBFIRST, - * mode 0 - * @param mode SPI standard CPOL and CPHA levels - */ -void HardwareSPI::begin(void) { - begin(SPI_1_125MHZ, MSBFIRST, 0); -} - -/** - * @brief send a byte out the spi peripheral - * @param data byte to send - */ -void HardwareSPI::send(uint8 data) { - spi_tx(this->spi_num, data); -} - - -/** - * @brief read a byte from the spi peripheral - * @return byte in the buffer - */ -uint8 HardwareSPI::recv(void) { - return spi_rx(this->spi_num); -} - -HardwareSPI::HardwareSPI(uint32 spi_num) { - this->spi_num = spi_num; -} |