嵌入式

嵌入式linux spi转CH432驱动

2019-07-13 00:03发布

站内文章 / 嵌入式Linux
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一下程序为应用层操作程序，底层为基本的SPI驱动，应用层其它调用没有附上 具体寄存器操作也没附上，基本代码如下，测试通过#include #include #include #include #include #include #include #include #include #include #include "appspi.h" #include "spidev.h" #include "log/log.h" #include "ch432.h" #include "include/basetype.h" static int fd_spi[MAXNUM_SPI] = {-1, -1}; static uint8_t mode=SPI_MODE_0; static uint8_t bits = 8; static uint32_t speed = 24000000; #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) #define SIZE_APPSPI_RCVBUF 1024 struct appspi_rcvst { char buf[SIZE_APPSPI_RCVBUF]; int len; int head; }; static struct appspi_rcvst appspi_rcvbuf[MAXNUM_SPI]; int appspi_open(unsigned int port) { int fd; char dev[32]; int ret; if(-1 != fd_spi[port]) close(fd_spi[port]); if(port==0) sprintf(dev, "/dev/spidev0.0"); else if(port==1) sprintf(dev, "/dev/spidev0.1"); fd = open(dev, O_RDWR); if(fd<0) { printf("can't open spi device"); return 1; } print_log(LOGLVL_DEBUG,"open spi port=%d ",port); ret = ioctl(fd, SPI_IOC_WR_MODE,&mode); if (ret == -1) print_log(LOGLVL_ERROR,"can't set spi mode"); ret = ioctl(fd, SPI_IOC_RD_MODE,&mode); if (ret == -1) print_log(LOGLVL_ERROR,"can't get spi mode"); /* * bits per word */ ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits); if (ret == -1) print_log(LOGLVL_ERROR,"can't set bits per word"); ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits); if (ret == -1) print_log(LOGLVL_ERROR,"can't get bits per word"); /* * max speed hz */ ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed); if (ret == -1) print_log(LOGLVL_ERROR,"can't set max speed hz"); ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed); if (ret == -1) print_log(LOGLVL_ERROR,"can't get max speed hz"); print_log(LOGLVL_DEBUG,"spi mode: %d ", mode); printf("bits per word: %d ", bits); printf("max speed: %d Hz (%d KHz) ", speed, speed/1000); fd_spi[port]=fd; appspi_rcvbuf[port].len=0; return 0; } void appspi_close(unsigned int port) { if((port >= MAXNUM_SPI) || (-1 == fd_spi[port])) return; close(fd_spi[port]); fd_spi[port] = -1; } int appspi_send(unsigned int port, UCHAR *buf, unsigned int len) { // int i; int ret; int fd; if(port >= MAXNUM_SPI) return -1; fd = fd_spi[port]; if(fd < 0) { appspi_open(port); fd = fd_spi[port]; if(fd<0) return -1; } struct spi_ioc_transfer xfer[1]; memset(xfer, 0, sizeof(xfer)); xfer[0].tx_buf = (__u64)(int) buf; xfer[0].len = len; ret = ioctl(fd, SPI_IOC_MESSAGE(1), xfer); if (ret < 0) { print_log(LOGLVL_ERROR,"Error: SPI_IOC_MESSAGE "); return -1; } return ret; } int appspi_recv(unsigned int port,UCHAR addr, UCHAR *buf, unsigned int len) { // int i; int ret; int fd; UCHAR tx[32]; // UCHAR *bp; if(port>= MAXNUM_SPI) return -1; fd = fd_spi[port]; if(fd < 0) { appspi_open(port); fd = fd_spi[port]; if(fd<0) return -1; } struct spi_ioc_transfer xfer[2]; memset(xfer, 0, sizeof(xfer)); tx[0]=addr; xfer[0].tx_buf =(__u64)(int)tx; xfer[0].len = 1; xfer[1].rx_buf =(__u64)(int) buf; xfer[1].len =len; ret = ioctl(fd, SPI_IOC_MESSAGE(2), xfer); if (ret < 0) { print_log(LOGLVL_ERROR,"Error: SPI_IOC_MESSAGE "); return -1; } return ret; } int appspi_getfd(unsigned int port) { if(port >= MAXNUM_SPI) return -1; return(fd_spi[port]); } void writeCH432Data(unsigned int port,UCHAR mAddr,UCHAR dat) { UCHAR buf[2]; mAddr=(mAddr<<2)|0x02; buf[0]=mAddr; buf[1]=dat; appspi_send(port,buf,2); } void WriteCH432Block(unsigned int port,UCHAR mAddr,int len,UCHAR *dat) { while(len--) { writeCH432Data(port,mAddr,*dat++); } } unsigned char ReadCH432Data(unsigned int port,UCHAR mAddr) { unsigned char recvdata=0; int ret; mAddr=(mAddr<<2)&0xFD; // appspi_send(port,&mAddr,1); ret=appspi_recv(port,mAddr,&recvdata,1); return(recvdata); }

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