add Canon managing device KiCAD schematic & PCB

F1:F103/Canon_managing_device/spi.c

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+/*
+ * This file is part of the LED_screen project.
+ * Copyright 2019 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// memcpy hangs -> use my own
+
+#include "spi.h"
+#include "hardware.h"
+#ifdef EBUG
+#include "usb.h"
+#endif
+#include "proto.h"
+
+/*
+static void mymemcpy(uint8_t *dest, uint8_t *src, int len){
+    while(len--) *dest++ = *src++;
+}*/
+
+// CR1 register default values, can be changed in 'proto.c'
+uint32_t SPI_CR1 = SPI_CR1_MSTR | SPI_CR1_BR | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_CPHA | SPI_CR1_CPOL;
+
+spiStatus SPI_status = SPI_NOTREADY;
+static uint8_t inbuff[SPIBUFSZ], lastlen = 0;
+
+void spi_setup(){
+    RCC->APB2ENR |= SPI_APB2; // Enable the peripheral clock SPI1
+    // master, no slave select, BR=F/16, CPOL/CPHA - polarity.
+    SPIx->CR1 = SPI_CR1;
+    SPI_status = SPI_READY;
+    SPIx->CR1 |= SPI_CR1_SPE; // enable SPI
+}
+
+/**
+ * @brief SPI_transmit - transmit data over SPI DMA
+ * @param buf - data to transmit
+ * @param len - its length
+ * @return amount of transmitted data
+ */
+uint8_t SPI_transmit(const uint8_t *buf, uint8_t len){
+    if(!buf || !len) return 0; // bad data format
+    if(SPI_status != SPI_READY) return 0; // spi not ready to transmit data
+    for(uint8_t x = 0; x < len; ++x){
+        while(!(SPI1->SR & SPI_SR_TXE));
+        SPI1->DR = buf[x];
+        while(!(SPI1->SR & SPI_SR_BSY));
+        while(!(SPI1->SR & SPI_SR_RXNE));
+        inbuff[x] = SPI1->DR;
+        for(int ctr = 0; ctr < 3600; ++ctr) nop(); // ~100mks delay
+    }
+    lastlen = len;
+    return len;
+}
+
+/**
+ * @brief SPI_receive - get received data
+ * @param len (o) - received length
+ * @return received buffer
+ */
+uint8_t *SPI_receive(uint8_t *len){
+    if(SPI_status != SPI_READY) return NULL;
+    if(lastlen == 0) return NULL;
+    if(len) *len = lastlen;
+    lastlen = 0;
+    return inbuff;
+}
+