213 lines
6.9 KiB
C
213 lines
6.9 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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LPC43xx DAC driver - Copyright (C) 2013 Marcin Jokel
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC43xx/dac_lld.c
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* @brief LPC43xx DAC subsystem low level driver source.
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*
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* @addtogroup DAC
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_DAC || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief CHN1 driver identifier.*/
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DACDriver DACD1;
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static lpc_dma_lli_config_t lpc_dac_lli[2] __attribute__((aligned(0x10)));
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Shared end/half-of-tx service routine.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] flags pre-shifted content of the ISR register
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*/
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static void dac_serve_dma_interrupt(DACDriver *dacp, uint32_t flags) {
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if ((flags & (1 << LPC_DAC_DMA_CHANNEL)) != 0) {
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_dac_isr_error_code(dacp, flags); /* DMA errors handling.*/
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}
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else {
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if (dacp->half_buffer == false) {
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_dac_isr_half_code(dacp);
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dacp->half_buffer = true;
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}
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else {
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_dac_isr_full_code(dacp);
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dacp->half_buffer = false;
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}
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}
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level DAC driver initialization.
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*
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* @notapi
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*/
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void dac_lld_init(void) {
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dacObjectInit(&DACD1);
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}
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/**
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* @brief Configures and activates the DAC peripheral.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @notapi
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*/
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void dac_lld_start(DACDriver *dacp) {
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if (dacp->state == DAC_STOP) {
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LPC_CCU1->CLK_APB3_DAC_CFG = 1; /* Enable clock. */
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LPC_DAC->CR = 0;
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LPC_DAC->CTRL = 0;
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LPC_DAC->CNTVAL = LPC_BASE_APB3_CLK/dacp->config->frequency;
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dmaMuxSet(PERIPHERAL15, 0);
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dmaChannelAllocate(LPC_DAC_DMA_CHANNEL, \
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(lpc_dmaisr_t)dac_serve_dma_interrupt, \
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(void *)dacp);
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}
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}
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/**
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* @brief Deactivates the DAC peripheral.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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*
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* @notapi
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*/
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void dac_lld_stop(DACDriver *dacp) {
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/* If in ready state then disables the DAC clock.*/
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if (dacp->state == DAC_READY) {
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/* DMA disable.*/
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dmaChannelDisable(LPC_DAC_DMA_CHANNEL);
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dmaChannelRelease(LPC_DAC_DMA_CHANNEL);
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LPC_DAC->CTRL = 0; /* Disable DAC */
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LPC_CCU1->CLK_APB3_DAC_CFG = 0; /* Disable clock. */
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}
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}
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/**
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* @brief Sends data over the DAC bus.
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* @details This asynchronous function starts a transmit operation.
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* @post At the end of the operation the configured callback is invoked.
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*
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* @param[in] dacp pointer to the @p DACDriver object
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* @param[in] n number of words to send
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* @param[in] txbuf the pointer to the transmit buffer
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*
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* @notapi
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*/
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void dac_lld_start_conversion(DACDriver *dacp) {
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dacp->half_buffer = false;
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uint32_t dma_ch_config;
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/* DMA configuration */
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lpc_dac_lli[0].srcaddr = (uint32_t) &dacp->samples[0];
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lpc_dac_lli[0].dstaddr = (uint32_t)&LPC_DAC->CR;
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lpc_dac_lli[0].lli = (uint32_t) &lpc_dac_lli[1];
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lpc_dac_lli[0].control =
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DMA_CTRL_TRANSFER_SIZE(dacp->depth/2) |
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DMA_CTRL_SRC_BSIZE_1 |
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DMA_CTRL_DST_BSIZE_1 |
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DMA_CTRL_SRC_WIDTH_WORD |
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DMA_CTRL_DST_WIDTH_WORD |
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DMA_CTRL_SRC_AHBM0 |
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DMA_CTRL_DST_AHBM1 |
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DMA_CTRL_SRC_INC |
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DMA_CTRL_DST_NOINC |
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DMA_CTRL_PROT1_USER |
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DMA_CTRL_PROT2_NONBUFF |
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DMA_CTRL_PROT3_NONCACHE |
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DMA_CTRL_INT;
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lpc_dac_lli[1].srcaddr = (uint32_t) &dacp->samples[dacp->depth/2];
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lpc_dac_lli[1].dstaddr = lpc_dac_lli[0].dstaddr;
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lpc_dac_lli[1].control = lpc_dac_lli[0].control;
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if (dacp->grpp->circular == true) {
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lpc_dac_lli[1].lli = (uint32_t) &lpc_dac_lli[0];
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}
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else {
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lpc_dac_lli[1].lli = 0;
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}
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dma_ch_config =
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DMA_CFG_CH_ENABLE |
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DMA_CFG_DST_PERIPH(PERIPHERAL15) |
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DMA_CFG_FCTRL_M2P |
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DMA_CFG_IE |
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DMA_CFG_ITC;
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dmaChannelSrcAddr(LPC_DAC_DMA_CHANNEL, lpc_dac_lli[0].srcaddr);
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dmaChannelDstAddr(LPC_DAC_DMA_CHANNEL, lpc_dac_lli[0].dstaddr);
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dmaChannelLinkedList(LPC_DAC_DMA_CHANNEL, lpc_dac_lli[0].lli, DMA_LLI_AHBM0);
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dmaChannelControl(LPC_DAC_DMA_CHANNEL, lpc_dac_lli[0].control);
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dmaChannelConfig(LPC_DAC_DMA_CHANNEL, dma_ch_config);
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LPC_DAC->CTRL = DACCTRL_DMA_ENA | DACCTRL_CNT_ENA | DACCTRL_DBLBUF_ENA;
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}
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void dac_lld_stop_conversion(DACDriver *dacp) {
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/* If in active state then disables the DAC.*/
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if (dacp->state == DAC_ACTIVE) {
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/* DMA disable.*/
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dmaChannelDisable(LPC_DAC_DMA_CHANNEL);
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}
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};
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#endif /* HAL_USE_DAC */
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/** @} */
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