94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
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#include "uni_avr_rpi.h"
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#ifdef __SWSPI
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#include "swspi.h"
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#ifdef __RPI
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//#define swspi_miso 9
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#define swspi_miso 10
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#define swspi_mosi 10
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#define swspi_sck 11
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#define SWSPI_CS 7
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#endif //__RPI
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#define SWSPI_DEL 0x0f //delay mask (0-3. bit, delay = 1 << DEL [us])
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#define SWSPI_POL 0x10 //polarity mask (4. bit, 1=inverted)
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#define SWSPI_PHA 0x20 //phase mask (5. bit)
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#define SWSPI_DOR 0x40 //data order mask (6. bit, 0=MSB first, 1=LSB first)
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#define SWSPI_SCK_UP if (swspi_cfg & SWSPI_POL) GPIO_CLR(swspi_sck); else GPIO_SET(swspi_sck);
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#define SWSPI_SCK_DN if (swspi_cfg & SWSPI_POL) GPIO_SET(swspi_sck); else GPIO_CLR(swspi_sck);
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unsigned char swspi_miso = 0;
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unsigned char swspi_mosi = 0;
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unsigned char swspi_sck = 0;
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unsigned char swspi_cfg = 0;
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void swspi_init(unsigned char miso, unsigned char mosi, unsigned char sck, unsigned char cfg)
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{
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swspi_miso = miso;
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swspi_mosi = mosi;
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swspi_sck = sck;
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swspi_cfg = cfg;
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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_CLR(swspi_mosi);
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SWSPI_SCK_DN;
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}
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void swspi_tx(unsigned char tx)
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{
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int delay = 1 << (swspi_cfg & SWSPI_DEL));
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if (swspi_miso == swspi_mosi) 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(delay);
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SWSPI_SCK_UP;
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DELAY(delay);
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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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int delay = 1 << (swspi_cfg & SWSPI_DEL));
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if (swspi_miso == swspi_mosi) GPIO_OUT(swspi_mosi);
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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(delay);
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SWSPI_SCK_UP;
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DELAY(delay);
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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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unsigned char swspi_txrx(unsigned char tx)
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{
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int delay = 1 << (swspi_cfg & SWSPI_DEL));
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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(delay);
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SWSPI_SCK_UP;
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DELAY(delay);
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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
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