From 4085ae3ddfbbf10c8ccbd3dccd43452c40a1fe40 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Fri, 13 Mar 2015 12:24:52 +0200 Subject: Add bootloader, nfclib and sensorlib --- boot_loader/bl_ssi.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 boot_loader/bl_ssi.c (limited to 'boot_loader/bl_ssi.c') diff --git a/boot_loader/bl_ssi.c b/boot_loader/bl_ssi.c new file mode 100644 index 0000000..ca10517 --- /dev/null +++ b/boot_loader/bl_ssi.c @@ -0,0 +1,161 @@ +//***************************************************************************** +// +// bl_ssi.c - Functions used to transfer data via the SSI port. +// +// Copyright (c) 2006-2014 Texas Instruments Incorporated. All rights reserved. +// Software License Agreement +// +// Texas Instruments (TI) is supplying this software for use solely and +// exclusively on TI's microcontroller products. The software is owned by +// TI and/or its suppliers, and is protected under applicable copyright +// laws. You may not combine this software with "viral" open-source +// software in order to form a larger program. +// +// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS. +// 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. TI SHALL NOT, UNDER ANY +// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL +// DAMAGES, FOR ANY REASON WHATSOEVER. +// +// This is part of revision 2.1.0.12573 of the Tiva Firmware Development Package. +// +//***************************************************************************** + +#include +#include "inc/hw_gpio.h" +#include "inc/hw_memmap.h" +#include "inc/hw_ssi.h" +#include "inc/hw_sysctl.h" +#include "inc/hw_types.h" +#include "bl_config.h" +#include "boot_loader/bl_ssi.h" + +//***************************************************************************** +// +//! \addtogroup bl_ssi_api +//! @{ +// +//***************************************************************************** +#if defined(SSI_ENABLE_UPDATE) || defined(DOXYGEN) + +//***************************************************************************** +// +//! Sends data via the SSI port in slave mode. +//! +//! \param pui8Data is the location of the data to send through the SSI port. +//! \param ui32Size is the number of bytes of data to send. +//! +//! This function sends data through the SSI port in slave mode. This function +//! will not return until all bytes are sent. +//! +//! \return None. +// +//***************************************************************************** +void +SSISend(const uint8_t *pui8Data, uint32_t ui32Size) +{ + // + // Send the requested number of bytes over the SSI port. + // + while(ui32Size--) + { + // + // Wait until there is space in the SSI FIFO. + // + while(!(HWREG(SSI0_BASE + SSI_O_SR) & SSI_SR_TNF)) + { + } + + // + // Write the next byte to the SSI port. + // + HWREG(SSI0_BASE + SSI_O_DR) = *pui8Data++; + } + + // + // Empty the receive FIFO. + // + while(HWREG(SSI0_BASE + SSI_O_SR) & SSI_SR_RNE) + { + HWREG(SSI0_BASE + SSI_O_DR); + } +} + +//***************************************************************************** +// +//! Waits until all data has been transmitted by the SSI port. +//! +//! This function waits until all data written to the SSI port has been read by +//! the master. +//! +//! \return None. +// +//***************************************************************************** +void +SSIFlush(void) +{ + // + // Wait until the transmit FIFO is empty. + // + while(!(HWREG(SSI0_BASE + SSI_O_SR) & SSI_SR_TFE)) + { + } + + // + // Wait until the interface is not busy. + // + while(HWREG(SSI0_BASE + SSI_O_SR) & SSI_SR_BSY) + { + } +} + +//***************************************************************************** +// +//! Receives data from the SSI port in slave mode. +//! +//! \param pui8Data is the location to store the data received from the SSI +//! port. +//! \param ui32Size is the number of bytes of data to receive. +//! +//! This function receives data from the SSI port in slave mode. The function +//! will not return until \e ui32Size number of bytes have been received. +//! +//! \return None. +// +//***************************************************************************** +void +SSIReceive(uint8_t *pui8Data, uint32_t ui32Size) +{ + // + // Ensure that we are sending out zeros so that we don't confuse the host. + // + HWREG(SSI0_BASE + SSI_O_DR) = 0; + + // + // Wait for the requested number of bytes. + // + while(ui32Size--) + { + // + // Wait until there is data in the FIFO. + // + while(!(HWREG(SSI0_BASE + SSI_O_SR) & SSI_SR_RNE)) + { + } + + // + // Read the next byte from the FIFO. + // + *pui8Data++ = HWREG(SSI0_BASE + SSI_O_DR); + HWREG(SSI0_BASE + SSI_O_DR) = 0; + } +} + +//***************************************************************************** +// +// Close the Doxygen group. +//! @} +// +//***************************************************************************** +#endif -- cgit v1.3.1