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https://github.com/openmv/openmv.git
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153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (c) 2021 Lake Fu at <lake_fu@pixart.com>
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* Copyright (C) 2023-2024 OpenMV, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* Pixart SPI driver.
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*/
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#include "omv_boardconfig.h"
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#ifdef OMV_CSI_SPI_ID
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include "omv_common.h"
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#include "omv_gpio.h"
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#include "omv_spi.h"
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#include "pixspi.h"
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#define SPI_BUS_TIMEOUT (5000) // in ms
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#ifdef PIXART_SPI_DEBUG
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#define debug_printf(...) printf(__VA_ARGS__)
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#else
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#define debug_printf(...)
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#endif
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static omv_spi_t spi_bus;
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static int spi_send(uint8_t *txbuf, uint16_t len) {
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int ret = 0;
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omv_spi_transfer_t spi_xfer = {
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.txbuf = txbuf,
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.rxbuf = NULL,
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.size = len,
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.timeout = SPI_BUS_TIMEOUT,
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.flags = OMV_SPI_XFER_BLOCKING,
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.callback = NULL,
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.userdata = NULL,
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};
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omv_gpio_write(spi_bus.cs, 0);
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ret = omv_spi_transfer_start(&spi_bus, &spi_xfer);
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omv_gpio_write(spi_bus.cs, 1);
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return ret;
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}
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static int spi_send_recv(uint8_t *txbuf, uint8_t *rxbuf, uint16_t len) {
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int ret = 0;
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omv_spi_transfer_t spi_xfer = {
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.timeout = SPI_BUS_TIMEOUT,
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.flags = OMV_SPI_XFER_BLOCKING,
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.callback = NULL,
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.userdata = NULL,
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};
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omv_gpio_write(spi_bus.cs, 0);
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spi_xfer.size = 1;
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spi_xfer.txbuf = txbuf;
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spi_xfer.rxbuf = NULL;
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ret |= omv_spi_transfer_start(&spi_bus, &spi_xfer);
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spi_xfer.size = len;
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spi_xfer.txbuf = NULL;
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spi_xfer.rxbuf = rxbuf;
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ret |= omv_spi_transfer_start(&spi_bus, &spi_xfer);
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omv_gpio_write(spi_bus.cs, 1);
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return ret;
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}
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bool pixspi_init() {
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// Init SPI
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omv_spi_config_t spi_config;
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omv_spi_default_config(&spi_config, OMV_CSI_SPI_ID);
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spi_config.baudrate = 5000000;
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spi_config.nss_enable = false; // Soft NSS
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spi_config.clk_pol = OMV_SPI_CPOL_HIGH;
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spi_config.clk_pha = OMV_SPI_CPHA_2EDGE;
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if (omv_spi_init(&spi_bus, &spi_config) != 0) {
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return false;
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}
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return true;
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}
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void pixspi_release() {
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omv_gpio_write(spi_bus.cs, 1);
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omv_spi_deinit(&spi_bus);
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}
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int pixspi_regs_read(uint8_t addr, uint8_t *data, uint16_t length) {
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if (addr & 0x80) {
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debug_printf("pixspi_regs_read() address (0x%x) overflow.\n", addr);
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return -1;
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}
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addr |= 0x80;
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if (spi_send_recv(&addr, data, length) == -1) {
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debug_printf("spi_send_recv() failed.\n");
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return -1;
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}
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return 0;
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}
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int pixspi_regs_write(uint8_t addr, const uint8_t *data, uint16_t length) {
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uint8_t buff[256] = {};
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if (addr & 0x80) {
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debug_printf("pixspi_regs_read() address (0x%x) overflow.\n", addr);
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return -1;
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}
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int32_t remaining = length;
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const static uint16_t MAX_LENGTH = 255;
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do {
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uint16_t len = remaining > MAX_LENGTH ? MAX_LENGTH : remaining;
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buff[0] = addr;
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memcpy(buff + 1, data, len);
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if (spi_send(buff, len + 1) == -1) {
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debug_printf("spi_send() failed.\n");
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return -1;
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}
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remaining = remaining - MAX_LENGTH;
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} while (remaining > 0);
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return 0;
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}
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#endif
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