kopia lustrzana https://github.com/OpenRTX/OpenRTX
78 wiersze
3.0 KiB
C
78 wiersze
3.0 KiB
C
/***************************************************************************
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* Copyright (C) 2023 - 2025 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN, *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <spi_bitbang.h>
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#include <spi_custom.h>
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#include <hwconfig.h>
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#include <pthread.h>
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#include <pinmap.h>
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#include <spi_stm32.h>
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#include <adc_stm32.h>
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static pthread_mutex_t c6000_mutex;
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static pthread_mutex_t adcMutex;
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/**
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* SPI bitbang function for HR_C6000 command interface (U_SPI).
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*
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* Hand-tuned to be as fast as possible, gives the following clock performance
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* when compiled with -Os and run on STM32F405 at 168MHz:
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*
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* - Freq 6.46MHz
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* - Pos. width 71ns
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* - Neg. with 83ns
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*/
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static uint8_t spiC6000_func(const void *priv, uint8_t value)
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{
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(void) priv;
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uint8_t incoming = 0;
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__disable_irq();
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for(uint8_t cnt = 0; cnt < 8; cnt++)
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{
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GPIOE->BSRR = (1 << 3); // Set PE3 (CLK)
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if(value & (0x80 >> cnt))
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GPIOE->BSRR = 1 << 4; // Set PE4 (MOSI)
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else
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GPIOE->BSRR = 1 << 20; // Clear PE4 (MOSI)
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// ~70ns delay
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asm volatile(" mov r1, #1 \n"
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"___loop_1: cmp r1, #0 \n"
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" itt ne \n"
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" subne r1, r1, #1 \n"
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" bne ___loop_1 \n":::"r1");
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incoming <<= 1;
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GPIOE->BSRR = (1 << 19); // Clear PE3 (CLK)
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incoming |= (GPIOE->IDR >> 5) & 0x01; // Read PE5 (MISO)
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}
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__enable_irq();
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return incoming;
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}
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SPI_CUSTOM_DEVICE_DEFINE(c6000_spi, spiC6000_func, NULL, &c6000_mutex)
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SPI_STM32_DEVICE_DEFINE(nvm_spi, SPI1, NULL)
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ADC_STM32_DEVICE_DEFINE(adc1, ADC1, &adcMutex, ADC_COUNTS_TO_UV(3300000, 12))
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