mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 20:50:28 +00:00
340 lines
10 KiB
C
Executable File
340 lines
10 KiB
C
Executable File
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file LPC214x/spi_lld.c
|
|
* @brief LPC214x low level SPI driver code.
|
|
*
|
|
* @addtogroup SPI
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
|
|
#if HAL_USE_SPI || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
#if LPC214x_SPI_USE_SSP || defined(__DOXYGEN__)
|
|
/** @brief SPI1 driver identifier.*/
|
|
SPIDriver SPID1;
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local variables and types. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Preloads the transmit FIFO.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*/
|
|
static void ssp_fifo_preload(SPIDriver *spip) {
|
|
SSP *ssp = spip->ssp;
|
|
uint32_t n = spip->txcnt > LPC214x_SSP_FIFO_DEPTH ?
|
|
LPC214x_SSP_FIFO_DEPTH : spip->txcnt;
|
|
|
|
while(((ssp->SSP_SR & SR_TNF) != 0) && (n > 0)) {
|
|
if (spip->txptr != NULL) {
|
|
if ((ssp->SSP_CR0 & CR0_DSSMASK) > CR0_DSS8BIT)
|
|
ssp->SSP_DR = *(uint16_t *)spip->txptr++;
|
|
else
|
|
ssp->SSP_DR = *(uint8_t *)spip->txptr++;
|
|
}
|
|
else
|
|
ssp->SSP_DR = 0xFFFFFFFF;
|
|
n--;
|
|
spip->txcnt--;
|
|
}
|
|
}
|
|
|
|
#if defined(__GNUC__)
|
|
__attribute__((noinline))
|
|
#endif
|
|
/**
|
|
* @brief Common IRQ handler.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*/
|
|
static void serve_interrupt(SPIDriver *spip) {
|
|
SSP *ssp = spip->ssp;
|
|
|
|
if ((ssp->SSP_MIS & MIS_ROR) != 0) {
|
|
/* The overflow condition should never happen because priority is given
|
|
to receive but a hook macro is provided anyway...*/
|
|
LPC214x_SPI_SSP_ERROR_HOOK();
|
|
}
|
|
ssp->SSP_ICR = ICR_RT | ICR_ROR;
|
|
while ((ssp->SSP_SR & SR_RNE) != 0) {
|
|
if (spip->rxptr != NULL) {
|
|
if ((ssp->SSP_CR0 & CR0_DSSMASK) > CR0_DSS8BIT)
|
|
*(uint16_t *)spip->rxptr++ = ssp->SSP_DR;
|
|
else
|
|
*(uint8_t *)spip->rxptr++ = ssp->SSP_DR;
|
|
}
|
|
else
|
|
(void)ssp->SSP_DR;
|
|
if (--spip->rxcnt == 0) {
|
|
chDbgAssert(spip->txcnt == 0,
|
|
"spi_serve_interrupt(), #1", "counter out of synch");
|
|
/* Stops the IRQ sources.*/
|
|
ssp->SSP_IMSC = 0;
|
|
/* Portable SPI ISR code defined in the high level driver, note, it is
|
|
a macro.*/
|
|
_spi_isr_code(spip);
|
|
return;
|
|
}
|
|
}
|
|
ssp_fifo_preload(spip);
|
|
if (spip->txcnt == 0)
|
|
ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_RX;
|
|
}
|
|
|
|
/*===========================================================================*/
|
|
/* Driver interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
#if LPC214x_SPI_USE_SSP || defined(__DOXYGEN__)
|
|
/**
|
|
* @brief SPI1 interrupt handler.
|
|
*
|
|
* @isr
|
|
*/
|
|
CH_IRQ_HANDLER(SPI1IrqHandler) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
|
|
serve_interrupt(&SPID1);
|
|
VICVectAddr = 0;
|
|
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Low level SPI driver initialization.
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_init(void) {
|
|
|
|
#if LPC214x_SPI_USE_SSP
|
|
spiObjectInit(&SPID1);
|
|
SPID1.ssp = SSPBase;
|
|
SetVICVector(SPI1IrqHandler, LPC214x_SPI_SSP_IRQ_PRIORITY, SOURCE_SPI1);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Configures and activates the SPI peripheral.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_start(SPIDriver *spip) {
|
|
|
|
if (spip->state == SPI_STOP) {
|
|
/* Clock activation.*/
|
|
#if LPC214x_SPI_USE_SSP
|
|
if (&SPID1 == spip) {
|
|
PCONP = (PCONP & PCALL) | PCSPI1;
|
|
VICIntEnable = INTMASK(SOURCE_SPI1);
|
|
}
|
|
#endif
|
|
}
|
|
/* Configuration.*/
|
|
spip->ssp->SSP_CR1 = 0;
|
|
/* Emptying the receive FIFO, it happens to not be empty while debugging.*/
|
|
while (spip->ssp->SSP_SR & SR_RNE)
|
|
(void) spip->ssp->SSP_DR;
|
|
spip->ssp->SSP_ICR = ICR_RT | ICR_ROR;
|
|
spip->ssp->SSP_CR0 = spip->config->cr0;
|
|
spip->ssp->SSP_CPSR = spip->config->cpsr;
|
|
spip->ssp->SSP_CR1 = CR1_SSE;
|
|
}
|
|
|
|
/**
|
|
* @brief Deactivates the SPI peripheral.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_stop(SPIDriver *spip) {
|
|
|
|
if (spip->state != SPI_STOP) {
|
|
spip->ssp->SSP_CR1 = 0;
|
|
spip->ssp->SSP_CR0 = 0;
|
|
spip->ssp->SSP_CPSR = 0;
|
|
#if LPC214x_SPI_USE_SSP
|
|
if (&SPID1 == spip) {
|
|
PCONP = (PCONP & PCALL) & ~PCSPI1;
|
|
VICIntEnClear = INTMASK(SOURCE_SPI1);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Asserts the slave select signal and prepares for transfers.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_select(SPIDriver *spip) {
|
|
|
|
palClearPad(spip->config->ssport, spip->config->sspad);
|
|
}
|
|
|
|
/**
|
|
* @brief Deasserts the slave select signal.
|
|
* @details The previously selected peripheral is unselected.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_unselect(SPIDriver *spip) {
|
|
|
|
palSetPad(spip->config->ssport, spip->config->sspad);
|
|
}
|
|
|
|
/**
|
|
* @brief Ignores data on the SPI bus.
|
|
* @details This function transmits a series of idle words on the SPI bus and
|
|
* ignores the received data. This function can be invoked even
|
|
* when a slave select signal has not been yet asserted.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param[in] n number of words to be ignored
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_ignore(SPIDriver *spip, size_t n) {
|
|
|
|
spip->rxptr = NULL;
|
|
spip->txptr = NULL;
|
|
spip->rxcnt = spip->txcnt = n;
|
|
ssp_fifo_preload(spip);
|
|
spip->ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
|
|
}
|
|
|
|
/**
|
|
* @brief Exchanges data on the SPI bus.
|
|
* @details This asynchronous function starts a simultaneous transmit/receive
|
|
* operation.
|
|
* @post At the end of the operation the configured callback is invoked.
|
|
* @note The buffers are organized as uint8_t arrays for data sizes below or
|
|
* equal to 8 bits else it is organized as uint16_t arrays.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param[in] n number of words to be exchanged
|
|
* @param[in] txbuf the pointer to the transmit buffer
|
|
* @param[out] rxbuf the pointer to the receive buffer
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_exchange(SPIDriver *spip, size_t n,
|
|
const void *txbuf, void *rxbuf) {
|
|
|
|
spip->rxptr = rxbuf;
|
|
spip->txptr = txbuf;
|
|
spip->rxcnt = spip->txcnt = n;
|
|
ssp_fifo_preload(spip);
|
|
spip->ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
|
|
}
|
|
|
|
/**
|
|
* @brief Sends data over the SPI bus.
|
|
* @details This asynchronous function starts a transmit operation.
|
|
* @post At the end of the operation the configured callback is invoked.
|
|
* @note The buffers are organized as uint8_t arrays for data sizes below or
|
|
* equal to 8 bits else it is organized as uint16_t arrays.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param[in] n number of words to send
|
|
* @param[in] txbuf the pointer to the transmit buffer
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
|
|
|
|
spip->rxptr = NULL;
|
|
spip->txptr = txbuf;
|
|
spip->rxcnt = spip->txcnt = n;
|
|
ssp_fifo_preload(spip);
|
|
spip->ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
|
|
}
|
|
|
|
/**
|
|
* @brief Receives data from the SPI bus.
|
|
* @details This asynchronous function starts a receive operation.
|
|
* @post At the end of the operation the configured callback is invoked.
|
|
* @note The buffers are organized as uint8_t arrays for data sizes below or
|
|
* equal to 8 bits else it is organized as uint16_t arrays.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param[in] n number of words to receive
|
|
* @param[out] rxbuf the pointer to the receive buffer
|
|
*
|
|
* @notapi
|
|
*/
|
|
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
|
|
|
|
spip->rxptr = rxbuf;
|
|
spip->txptr = NULL;
|
|
spip->rxcnt = spip->txcnt = n;
|
|
ssp_fifo_preload(spip);
|
|
spip->ssp->SSP_IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
|
|
}
|
|
|
|
/**
|
|
* @brief Exchanges one frame using a polled wait.
|
|
* @details This synchronous function exchanges one frame using a polled
|
|
* synchronization method. This function is useful when exchanging
|
|
* small amount of data on high speed channels, usually in this
|
|
* situation is much more efficient just wait for completion using
|
|
* polling than suspending the thread waiting for an interrupt.
|
|
*
|
|
* @param[in] spip pointer to the @p SPIDriver object
|
|
* @param[in] frame the data frame to send over the SPI bus
|
|
* @return The received data frame from the SPI bus.
|
|
*/
|
|
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
|
|
|
|
spip->ssp->SSP_DR = (uint32_t)frame;
|
|
while ((spip->ssp->SSP_SR & SR_RNE) == 0)
|
|
;
|
|
return (uint16_t)spip->ssp->SSP_DR;
|
|
}
|
|
|
|
#endif /* HAL_USE_SPI */
|
|
|
|
/** @} */
|