openmv/drivers/pixart/src/pixspi.c
iabdalkader daf2bb30da misc: Restructure repo.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
2025-04-13 08:28:34 +02:00

153 lines
4.1 KiB
C

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