73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "platform.h"
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#include "encoding.h"
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#define IOF_SPI1_MASK (0x38 | 0x4)
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int factorial(int i){
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volatile int result = 1;
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for (int ii = 1; ii <= i; ii++) {
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result = result * ii;
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}
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return result;
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}
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unsigned read_adc(unsigned index){
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unsigned char txdata[3];
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unsigned result=0;
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volatile int x;
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txdata[0]=0x1;
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txdata[1]=(0x8 | (index&0x7))<<4;
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txdata[2]=0x0;
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GPIO_REG(GPIO_IOF_SEL) &= ~IOF_SPI1_MASK;
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GPIO_REG(GPIO_IOF_EN) |= IOF_SPI1_MASK;
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SPI1_REG(SPI_REG_FMT) =
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SPI_FMT_PROTO(SPI_PROTO_S) |
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SPI_FMT_ENDIAN(SPI_ENDIAN_MSB) |
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SPI_FMT_DIR(SPI_DIR_RX) |
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SPI_FMT_LEN(8);
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SPI1_REG(SPI_REG_CSID) = 0;
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SPI1_REG(SPI_REG_CSDEF) = 0xFFFF;
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SPI1_REG(SPI_REG_SCKDIV) = 7;
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SPI1_REG(SPI_REG_SCKMODE) = SPI_SCK_PHA | SPI_SCK_POL; //shifted on the leading edge, sampled on trailing, Inactive state of SCK is logical 1
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SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
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while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
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SPI1_REG(SPI_REG_TXFIFO) = txdata[0];
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while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
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while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
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SPI1_REG(SPI_REG_TXFIFO) = txdata[1];
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while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
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result = (x & 0xFF)<<8;
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while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
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SPI1_REG(SPI_REG_TXFIFO) = txdata[2];
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while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
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result += (x & 0xFF);
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SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
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return result&0x03ff;
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}
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extern void write_hex(int fd, uint32_t hex);
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int main()
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{
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write_hex(1, 0x55aa);
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volatile int result = factorial (10);
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printf("Factorial is %d\n", result);
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for(unsigned i=0; i<8; ++i)
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printf("ADC%u value read is %u\n", i, read_adc(i));
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printf("End of execution");
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return 0;
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}
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