import sources

spi.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2017 Oleg Borodin <onborodin@gmail.com>
+ *
+ */
+
+#include <avr/io.h>
+#include <tools.h>
+#include <spi.h>
+
+void spi_init(void) {
+    /* Set PIN_MISO as input */
+    REG_SETDOWN_BIT(DDRB, PIN_MISO);
+    /* Set PIN_SS as output */
+    REG_SETUP_BIT(DDRB, PIN_SS);
+    REG_SETUP_BIT(DDRB, PIN_MOSI);
+    REG_SETUP_BIT(DDRB, PIN_SCK);
+    REG_SETUP_BIT(DDRB, PIN_RESET);
+    REG_SETUP_BIT(DDRB, PIN_A0);
+    /* Down SS */
+    REG_SETUP_BIT(PORTB, PIN_SS);
+    /* Set master mode */
+    REG_SETUP_BIT(SPCR, MSTR);
+    /* Set speed */
+    REG_SETDOWN_BIT(SPCR, SPR0);
+    REG_SETDOWN_BIT(SPCR, SPR1);
+    /* Set duble speed */
+    REG_SETUP_BIT(SPCR, SPI2X);
+    /* Set order */
+    REG_SETDOWN_BIT(SPCR, DORD);
+    /* Set mode */
+    REG_SETDOWN_BIT(SPCR, CPOL);
+    REG_SETDOWN_BIT(SPCR, CPHA);
+    /* Enable SPI */
+    REG_SETUP_BIT(SPCR, SPE);
+}
+
+inline void spi_write_byte(uint8_t data) {
+    SPDR = data;
+    while (!(SPSR & (1 << SPIF)));
+}
+
+inline uint8_t spi_read_byte(void) {
+    SPDR = 0xFF;
+    while (!(SPSR & (1 << SPIF)));
+    return SPDR;
+}
+
+inline void spi_select_mcp(void) {
+    REG_SETDOWN_BIT(PORTB, PIN_SS);
+}
+
+inline void spi_unselect_mcp(void) {
+    REG_SETUP_BIT(PORTB, PIN_SS);
+}
+
+void spi_enable(void) {
+    REG_SETUP_BIT(SPCR, SPE);
+}
+
+void spi_disable(void) {
+    REG_SETDOWN_BIT(SPCR, SPE);
+}
+
+void spi_write_word(uint16_t w) {
+    spi_write_byte(w >> 8);
+    spi_write_byte(w & 0xff);
+}
+
+void spi_write_word_array(uint16_t w, uint16_t n) {
+    while (n--)
+        spi_write_word(w);
+}
+
+
+