108 lines
2.2 KiB
C++
108 lines
2.2 KiB
C++
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#include "swspi.h"
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#ifdef SWSPI_RPI
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#include <bcm2835.h>
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#define GPIO_INP(gpio) bcm2835_gpio_fsel(gpio, BCM2835_GPIO_FSEL_INPT)
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#define GPIO_OUT(gpio) bcm2835_gpio_fsel(gpio, BCM2835_GPIO_FSEL_OUTP)
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#define GPIO_SET(gpio) bcm2835_gpio_write(gpio, HIGH)
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#define GPIO_CLR(gpio) bcm2835_gpio_write(gpio, LOW)
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#define GPIO_GET(gpio) (bcm2835_gpio_lev(gpio) != LOW)
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#define DELAY(delay) usleep(delay)
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#endif //SWSPI_RPI
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#ifdef SWSPI_AVR
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#include "Arduino.h"
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#define GPIO_INP(gpio) pinMode(gpio, INPUT)
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#define GPIO_OUT(gpio) pinMode(gpio, OUTPUT)
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#define GPIO_SET(gpio) digitalWrite(gpio, HIGH)
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#define GPIO_CLR(gpio) digitalWrite(gpio, LOW)
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#define GPIO_GET(gpio) (digitalRead(gpio) != LOW)
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#define DELAY(delay) delayMicroseconds(delay)
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#endif //SWSPI_AVR
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#if (SWSPI_POL != 0)
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#define SWSPI_SCK_UP GPIO_CLR(SWSPI_SCK)
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#define SWSPI_SCK_DN GPIO_SET(SWSPI_SCK)
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#else
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#define SWSPI_SCK_UP GPIO_SET(SWSPI_SCK)
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#define SWSPI_SCK_DN GPIO_CLR(SWSPI_SCK)
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#endif
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void swspi_init()
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{
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GPIO_INP(SWSPI_MISO);
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GPIO_OUT(SWSPI_MOSI);
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GPIO_OUT(SWSPI_SCK);
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GPIO_OUT(SWSPI_CS);
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GPIO_CLR(SWSPI_MOSI);
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SWSPI_SCK_DN;
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GPIO_SET(SWSPI_CS);
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}
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#if (SWSPI_MOSI == SWSPI_MISO)
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void swspi_tx(unsigned char tx)
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{
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GPIO_OUT(SWSPI_MOSI);
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unsigned char i = 0; for (; i < 8; i++)
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{
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if (tx & 0x80) GPIO_SET(SWSPI_MOSI);
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else GPIO_CLR(SWSPI_MOSI);
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DELAY(SWSPI_DEL);
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SWSPI_SCK_UP;
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DELAY(SWSPI_DEL);
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SWSPI_SCK_DN;
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tx <<= 1;
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}
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}
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unsigned char swspi_rx()
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{
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GPIO_INP(SWSPI_MISO);
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unsigned char rx = 0;
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unsigned char i = 0; for (; i < 8; i++)
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{
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rx <<= 1;
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DELAY(SWSPI_DEL);
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SWSPI_SCK_UP;
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DELAY(SWSPI_DEL);
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rx |= GPIO_GET(SWSPI_MISO)?1:0;
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SWSPI_SCK_DN;
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}
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return rx;
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}
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#else //(SWSPI_MOSI == SWSPI_MISO)
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unsigned char swspi_txrx(unsigned char tx)
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{
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unsigned char rx = 0;
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unsigned char i = 0; for (; i < 8; i++)
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{
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rx <<= 1;
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if (tx & 0x80) GPIO_SET(SWSPI_MOSI);
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else GPIO_CLR(SWSPI_MOSI);
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DELAY(SWSPI_DEL);
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SWSPI_SCK_UP;
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DELAY(SWSPI_DEL);
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rx |= GPIO_GET(SWSPI_MISO)?1:0;
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SWSPI_SCK_DN;
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tx <<= 1;
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}
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return rx;
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}
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#endif //(SWSPI_MOSI == SWSPI_MISO)
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void swspi_start()
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{
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GPIO_CLR(SWSPI_CS);
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}
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void swspi_stop()
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{
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GPIO_SET(SWSPI_CS);
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}
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