172 lines
5.0 KiB
C
172 lines
5.0 KiB
C
/****************************************************************************
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* arch/arm/src/sama5/sam_isi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <debug.h>
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#include "sam_memories.h"
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#include "sam_pio.h"
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#include "sam_pck.h"
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#include "sam_isi.h"
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#ifdef CONFIG_SAMA5_ISI
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The sensor master clock (ISI_MCK) is generated by the Advanced Power
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* Management Controller (APMC) through a Programmable Clock output.
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*/
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#ifndef CONFIG_ISI_MCKFREQ
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# error "CONFIG_ISI_MCKFREQ must be defined"
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#endif
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#if defined(CONFIG_ISI_PCK0)
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# define ISI_PCKID PCK0
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#elif defined(CONFIG_ISI_PCK1)
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# define ISI_PCKID PCK1
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#elif defined(CONFIG_ISI_PCK2)
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# define ISI_PCKID PCK2
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#else
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# error "No valid PCK selection"
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure defines the overall state of the ISI interface */
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struct sam_isi_s
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{
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uint32_t actual; /* Actual ISI_MCK frequency */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* ISI interface state */
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static struct sam_isi_s g_isi;
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: sam_isi_initialize
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*
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* Description:
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* Initialize the ISI driver.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK on success; Negated errno on failure.
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*
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* Assumptions:
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* Called very early in the initialization sequence.
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*
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****************************************************************************/
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int sam_isi_initialize(void)
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{
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int ret;
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/* Configure PIO pins for the ISI (outputs) */
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/* Data pins */
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sam_configpio(PIO_ISI_D0);
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sam_configpio(PIO_ISI_D1);
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sam_configpio(PIO_ISI_D2);
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sam_configpio(PIO_ISI_D3);
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sam_configpio(PIO_ISI_D4);
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sam_configpio(PIO_ISI_D5);
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sam_configpio(PIO_ISI_D6);
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sam_configpio(PIO_ISI_D7);
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sam_configpio(PIO_ISI_D8);
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sam_configpio(PIO_ISI_D9);
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sam_configpio(PIO_ISI_D10);
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sam_configpio(PIO_ISI_D11);
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/* Horizontal and vertical sync pins (inputs) */
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sam_configpio(PIO_ISI_HSYNC);
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sam_configpio(PIO_ISI_VSYNC);
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/* Pixel clock input (ISI_PCK, not to be confused with the processor clock
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* (PCK) or the programmable clock (PCK).
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*
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* NOTE: "Several parts of the ISI controller use the pixel clock provided
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* by the image sensor (ISI_PCK). Thus the user must first program the
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* image sensor to provide this clock (ISI_PCK) before programming the
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* Image Sensor Controller."
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*/
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sam_configpio(PIO_ISI_PCK);
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/* Configure ISI_MCK programmable clock output.
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*
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* REVISIT: Might this not be needed before the image sensor is
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* initialized?
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*/
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g_isi.actual = sam_pck_configure(ISI_PCKID, PCKSRC_MCK,
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CONFIG_ISI_MCKFREQ);
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ginfo("PCK%d frequency=%d actual=%d\n",
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ISI_PCKID, CONFIG_ISI_MCKFREQ, g_isi.actual);
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/* Enable the MCK (output) */
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sam_pck_enable(ISI_PCKID, true);
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/* Configure the pixel clock */
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#warning Missing logic
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/* Configure color */
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#warning Missing logic
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/* Configure decimation */
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#warning Missing logic
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/* Configure DMA */
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#warning Missing logic
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}
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#endif /* CONFIG_SAMA5_ISI */
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