136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
#include "app_config.h"
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#include "system/includes.h"
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#include "device/device.h"
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#include "device/iic.h"
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#define IIC_WRCMD 0x42 //IIC写地址命令
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#define IIC_RDCMD 0x43 //IIC读地址命令
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static int iic_write_one_byte(void *iic, unsigned char addr, unsigned char data)//返回值为0成功，非0失败
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{
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int ret = 0;
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dev_ioctl(iic, IIC_IOCTL_START, 0);//IIC锁定
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if (dev_ioctl(iic, IIC_IOCTL_TX_WITH_START_BIT, IIC_WRCMD)) {//起始信号 + 写地址命令
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ret = -1;
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printf("iic write err in IIC_IOCTL_TX_WITH_START_BIT \n");
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goto exit;
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}
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delay(1000);
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if (dev_ioctl(iic, IIC_IOCTL_TX, addr)) {//写地址
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ret = 0 - 1;
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printf("iic write err in IIC_IOCTL_TX\n");
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goto exit;
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}
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delay(1000);
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if (dev_ioctl(iic, IIC_IOCTL_TX_WITH_STOP_BIT, data)) {//写数据 + 结束信号
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ret = -1;
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printf("iic write err in IIC_IOCTL_TX_WITH_STOP_BIT\n");
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goto exit;
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}
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delay(1000);
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exit:
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dev_ioctl(iic, IIC_IOCTL_STOP, 0);//IIC解锁
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return ret;
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}
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static int iic_read_one_byte(void *iic, unsigned char addr, unsigned char *data)//返回值为0成功，非0失败
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{
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int ret = 0;
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dev_ioctl(iic, IIC_IOCTL_START, 0);//IIC锁定
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if (dev_ioctl(iic, IIC_IOCTL_TX_WITH_START_BIT, IIC_WRCMD)) {//起始信号 + 读地址命令
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ret = -1;
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printf("iic write err in IIC_IOCTL_TX_WITH_START_BIT\n");
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goto exit;
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}
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delay(1000);
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if (dev_ioctl(iic, IIC_IOCTL_TX_WITH_STOP_BIT, addr)) {//读地址 + 结束信号
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ret = -1;
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printf("iic write err IIC_IOCTL_TX_WITH_STOP_BIT\n");
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goto exit;
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}
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delay(1000);
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if (dev_ioctl(iic, IIC_IOCTL_TX_WITH_START_BIT, IIC_RDCMD)) {//起始信号 + 读数据命令
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ret = -1;
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printf("iic write err IIC_IOCTL_TX_WITH_START_BIT\n");
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goto exit;
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}
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delay(1000);
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#if 1
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//接收没有ACK：IIC_IOCTL_RX_WITH_STOP_BIT，读数据 + 结束信号
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dev_ioctl(iic, IIC_IOCTL_RX_WITH_STOP_BIT, (u32)data);//读数据 + 结束信号
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#else
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//接收需要ACK，则命令为 IIC_IOCTL_RX_WITH_ACK，如下：
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dev_ioctl(iic, IIC_IOCTL_RX_WITH_ACK, (u32)data);//读数据 + ACK
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dev_ioctl(iic, IIC_IOCTL_TX_STOP_BIT, 0);//结束信号
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#endif
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exit:
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dev_ioctl(iic, IIC_IOCTL_STOP, 0);//IIC解锁
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return ret;
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}
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static void iic_test_task(void *p)
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{
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//1.打开iic0的iic设备
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void *iic_hdl = dev_open("iic0", NULL);
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if (!iic_hdl) {
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printf("iic open err \n");
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goto exit;
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}
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u8 addr = 0x28;
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u8 data = 0x03;
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u8 id_addr = 0xf0;
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u8 id = 0;
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os_time_dly(2);//延时2个os tick
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//2.读取ID
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iic_read_one_byte(iic_hdl, id_addr, &id);
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if (id != 0x9d) { //ID为设备的ID好
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printf("err id no match \n");
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goto exit;
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}
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printf("dev id match = 0x%x \n", id);
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//3.对应地址写对应数据
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iic_write_one_byte(iic_hdl, addr, data);
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//4.对应地址写对应数据
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data = 0;
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iic_read_one_byte(iic_hdl, addr, &data);
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if (data != 0x03) { //写进去之后读取值进行比较
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printf("read no match \n");
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goto exit;
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}
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printf("write read test ok\n");
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exit:
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if (iic_hdl) { //关闭iic设备
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dev_close(iic_hdl);
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printf("dev close \n");
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}
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while (1) { //等待其他任务杀此任务
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os_time_dly(100);
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}
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printf("iic_test_task exit \n");
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}
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static int c_main(void)
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{
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os_task_create(iic_test_task, NULL, 12, 1000, 0, "iic_test_task");
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return 0;
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}
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late_initcall(c_main);
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