Mouse code for the MacroRat
mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/ncs36510_spi.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/** ****************************************************************************** * @file spi.c * @brief Implementation of a IPC 7207 SPI master driver * @internal * @author ON Semiconductor * @version $Rev: $ * @date $Date: 2016-02-05 $ ****************************************************************************** * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor). * All rights reserved. This software and/or documentation is licensed by ON Semiconductor * under limited terms and conditions. The terms and conditions pertaining to the software * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and * if applicable the software license agreement. Do not use this software and/or * documentation unless you have carefully read and you agree to the limited terms and * conditions. By using this software and/or documentation, you agree to the limited * terms and conditions. * * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. * @endinternal * * @ingroup spi * * @details * */ #if DEVICE_SPI #include "spi.h" #include "clock.h" #include "objects.h" #include "spi_api.h" #include "PeripheralPins.h" #include "spi_ipc7207_map.h" #include "crossbar.h" #include "pad.h" #include "mbed_assert.h" /** Initializes a spi device. * @details * * @param obj A spi device instance. * @param mosi pin to used as SPI MOSI * @param miso pin to used as SPI MISO * @param sclk pin to used as SPI SCLK * @return None */ void fSpiInit(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { uint32_t clockDivisor; /* determine the SPI to use */ SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); SPIName spi_data_1 = (SPIName)pinmap_merge(spi_mosi, spi_miso); SPIName spi_data_2 = (SPIName)pinmap_merge(spi_sclk, spi_ssel); obj->membase = (SpiIpc7207Reg_pt)pinmap_merge(spi_data_1, spi_data_2); MBED_ASSERT((int)obj->membase != NC); /* Check device to be activated */ if(obj->membase == SPI1REG) { /* SPI 1 selected */ CLOCK_ENABLE(CLOCK_SPI); /* Enable clock */ } else { /* SPI 2 selected */ CLOCK_ENABLE(CLOCK_SPI2); /* Enable clock */ } CLOCK_ENABLE(CLOCK_CROSSB); /* Cross bar setting: Map GPIOs to SPI */ pinmap_pinout(sclk, PinMap_SPI_SCLK); pinmap_pinout(mosi, PinMap_SPI_MOSI); /* Configure GPIO Direction */ CLOCK_ENABLE(CLOCK_GPIO); GPIOREG->W_OUT |= ((True << sclk) | (True << mosi) | (True << ssel)); /* Set pins as output */ GPIOREG->W_IN |= (True << miso); /* Set pin as input */ /* Pad settings */ CLOCK_ENABLE(CLOCK_PAD); pin_mode(sclk, PushPullPullDown); pin_mode(mosi, PushPullPullDown); /* PAD drive strength */ PadReg_t *padRegOffset = (PadReg_t*)(PADREG_BASE + (sclk * PAD_REG_ADRS_BYTE_SIZE)); padRegOffset->PADIO0.BITS.POWER = True; /* sclk: Drive strength */ padRegOffset->PADIO1.BITS.POWER = True; /* mosi: Drive strength */ if(miso != NC) { pinmap_pinout(miso, PinMap_SPI_MISO); /* Cross bar settings */ pin_mode(miso, OpenDrainNoPull); /* Pad setting */ padRegOffset->PADIO2.BITS.POWER = True; /* miso: Drive strength */ } if(ssel != NC) { pinmap_pinout(ssel, PinMap_SPI_SSEL); /* Cross bar settings */ pin_mode(ssel, PushPullPullUp); /* Pad setting */ padRegOffset->PADIO3.BITS.POWER = True; /* ssel: Drive strength */ SPI1REG->SLAVE_SELECT.BITS.SS_ENABLE = SPI_SLAVE_SELECT_NORM_BEHAVE; /* Slave select: Normal behavior */ } CLOCK_DISABLE(CLOCK_PAD); CLOCK_DISABLE(CLOCK_GPIO); CLOCK_DISABLE(CLOCK_CROSSB); /* disable/reset the spi port: Clear control register*/ obj->membase->CONTROL.WORD = False; /* set default baud rate to 1MHz */ clockDivisor = ((fClockGetPeriphClockfrequency() / SPI_DEFAULT_SPEED) >> True) - True; obj->membase->FDIV = clockDivisor; /* set tx/rx fifos watermarks */ /* TODO water mark level 1 byte ?*/ obj->membase->TX_WATERMARK = True; obj->membase->RX_WATERMARK = True; /* DIsable and clear IRQs */ /* TODO sync api, do not need irq ?*/ obj->membase->IRQ_ENABLE = False; obj->membase->IRQ_CLEAR = SPI_BYTE_MASK; /* Clear all */ /* configure slave select */ obj->membase->SLAVE_SELECT.WORD = SPI_SLAVE_SELECT_DEFAULT; obj->membase->SLAVE_SELECT_POLARITY = False; /* Configure control register parameters: 8 bits, master, CPOL = 0, Idle low. CPHA = 0, First transmit occurs before first edge of SCLK. MSB first. Sample incoming data on opposite edge of SCLK from when outgoing data is driven. enable the spi port */ obj->membase->CONTROL.WORD = SPI_DEFAULT_CONFIG; } /** Close a spi device. * @details * * @param obj The spi device to close. * @return None */ void fSpiClose(spi_t *obj) { /* disable the spi port */ obj->membase->CONTROL.BITS.ENABLE = False; /* disable interruption associated with spi */ NVIC_DisableIRQ(obj->irq); } /** * Write data to an SPI device. * The data is written from the buffer into the transmit register. * This function blocks untill write and read happens. * * @param obj The device to write to. * @param buf The buffer to write from (the contents of the buffer may not be modified). * @return the value received during send */ int fSpiWriteB(spi_t *obj, uint32_t const buf) { int byte; while((obj->membase->STATUS.BITS.TX_FULL == True) && (obj->membase->STATUS.BITS.RX_FULL == True)); /* Wait till Tx/Rx status is full */ obj->membase->TX_DATA = buf; while (obj->membase->STATUS.BITS.RX_EMPTY == True); /* Wait till Receive status is empty */ byte = obj->membase->RX_DATA; return byte; } #endif /* DEVICE_SPI */