summaryrefslogtreecommitdiff
path: root/spi/spi.h
blob: b6b0a909a6842ece93c4abb4a92f55e3973d048d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#ifndef SPI_H
#define SPI_H

#include <os/thread.h>

struct SPI_reg_t {
	volatile uint32_t CR1;
	volatile uint32_t CR2;
	volatile uint32_t SR;
	volatile uint32_t DR;
	volatile uint32_t CRCPR;
	volatile uint32_t RXCRCR;
	volatile uint32_t TXCRCR;
	volatile uint32_t I2SCFGR;
	volatile uint32_t I2SPR;
};

class SPI_t {
	public:
		SPI_reg_t& reg;
		
		SPI_t(uint32_t reg_addr) : reg(*(SPI_reg_t*)reg_addr) {}
		
		uint8_t transfer_byte(uint8_t out = 0) {
			reg.DR = out;
			
			while(!(reg.SR & 0x01)) {
				Thread::yield();
			}
			
			return reg.DR;
		}
};

#if defined(STM32F1)

#elif defined(STM32F4)
static SPI_t SPI1(0x40013000);
static SPI_t SPI2(0x40003800);
static SPI_t SPI3(0x40003c00);
#endif

#endif