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61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/*
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* geany_encoding=koi8-r
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* spi.c
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*
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* Copyright 2018 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#include "spi.h"
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#include "usart.h"
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extern volatile uint32_t Tms;
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static uint32_t tstart;
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extern void printu(uint32_t val);
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#define CHK(x, msg) do{tstart = Tms; do{if(Tms - tstart > 2){/*printu(SPI1->SR); SEND(msg);*/ return;}}while(x);}while(0)
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/**
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* send 1 byte blocking
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* return 1 on success
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*/
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void spi_write_byte(uint8_t data){
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CHK(!(SPI1->SR & SPI_SR_TXE), "TXEb1\n");
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// AHTUNG! without *((uint8_t*) STM32 will try to send TWO bytes (with second byte == 0)
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*((uint8_t*)&(SPI1->DR)) = data;
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CHK(!(SPI1->SR & SPI_SR_TXE), "TXEb2\n");
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CHK(SPI1->SR & SPI_SR_BSY, "BSYb\n");
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}
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/**
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* Blocking rite data to current SPI
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* @param data - buffer with data
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* @param len - buffer length
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* @return 0 in case of error (or 1 in case of success)
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*/
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void spiWrite(uint8_t *data, uint16_t len){
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uint16_t i;
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CHK(!(SPI1->SR & SPI_SR_TXE), "TXE1\n");
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for(i = 0; i < len; ++i){
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*((uint8_t*)&(SPI1->DR)) = data[i];
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CHK(!(SPI1->SR & SPI_SR_TXE), "TXE2\n");
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}
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CHK(SPI1->SR & SPI_SR_BSY, "BSY\n");
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}
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