184 lines
4.1 KiB
C
184 lines
4.1 KiB
C
/**
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* @file cm_demo_i2c.c
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* @brief OpenCPU i2c测试例程
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* @copyright Copyright ? 2021 China Mobile IOT. All rights reserved.
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include "cm_i2c.h"
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#include "cm_os.h"
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#include "cm_demo_uart.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define CM_DEMO_I2C_LOG cm_demo_printf
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#define EPROM_DEV_ADDR 0x50
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#define EPROM_I2C_ID CM_I2C_DEV_1
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/**
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* @brief eeprom写1字节数据
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*
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* @param [in] addr:地址，范围0-0x7fff
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* @param [in] data:待写入数据
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*
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* @return
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* = 0 - 成功.
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* < 0 - 失败, 返回值为错误码.
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*
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* @details More details
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*/
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static int32_t is24c256_write_byte(uint16_t addr, int8_t data)
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{
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int8_t tmp[3] = {0};
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int32_t ret = -1;
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tmp[0] = (addr >> 8) & 0xff;
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tmp[1] = addr & 0xff;
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tmp[2] = data;
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ret = cm_i2c_write(EPROM_I2C_ID , EPROM_DEV_ADDR, tmp, 3);
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if(ret < 0)
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{
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CM_DEMO_I2C_LOG("i2c write e2prom err:0x%x\r\n", ret);
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return -1;
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}
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return 0;
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}
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/**
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* @brief eeprom读1字节数据
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*
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* @param [in] addr:地址，范围0-0x7fff
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* @param [out] data:待读取数据指针
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*
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* @return
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* = 0 - 成功.
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* < 0 - 失败, 返回值为错误码.
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*
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* @details More details
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*/
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static int32_t is24c256_read_byte(uint16_t addr, int8_t* data)
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{
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int8_t tmp[2] = {0};
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int32_t ret;
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if(data == NULL)
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{
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CM_DEMO_I2C_LOG("is24c256_read_byte data ptr err\r\n");
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return -1;
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}
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tmp[0] = (addr >> 8) & 0xff;
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tmp[1] = addr & 0xff;
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ret = cm_i2c_write(EPROM_I2C_ID, EPROM_DEV_ADDR, tmp, 2);
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if(ret < 0)
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{
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CM_DEMO_I2C_LOG("i2c read addr err(w):%08x\r\n", ret);
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return ret;
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}
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ret = cm_i2c_read(EPROM_I2C_ID, EPROM_DEV_ADDR, data, 1);
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if(ret < 0)
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{
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CM_DEMO_I2C_LOG("i2c read addr err(r):%08x\r\n", ret);
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return ret;
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}
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/**
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* @brief eeprom利用i2c接口读写数据测试
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*
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* @return void
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*
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* @details More details
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*/
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int cm_test_i2c(unsigned char **cmd, int len)
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{
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cm_i2c_cfg_t config =
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{
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CM_I2C_ADDR_TYPE_7BIT,
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CM_I2C_MODE_MASTER, //目前仅支持模式
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CM_I2C_CLK_100KHZ
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};//master模式,(100KHZ)
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uint16_t eprom_addr = 0x100; //选取所支持的任意E2PROM地址进行测试,可修改
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int8_t w_data = 'B',r_data =0;
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int32_t ret;
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CM_DEMO_I2C_LOG("i2c test start，i2c num:%d!!\n",EPROM_I2C_ID);
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ret = cm_i2c_open(EPROM_I2C_ID, &config);
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if(ret != 0)
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{
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CM_DEMO_I2C_LOG("i2c init err,ret=%d\n", ret);
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return -1;
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}
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CM_DEMO_I2C_LOG("i2c init ok\n");
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//写入测试数据
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ret = is24c256_write_byte(eprom_addr, w_data);
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if(ret != 0)
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{
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CM_DEMO_I2C_LOG("i2c write e2prom err %d\n", (uint32_t)ret);
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cm_i2c_close(EPROM_I2C_ID);
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return -1;
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}
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CM_DEMO_I2C_LOG("i2c write e2prom ok\n");
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osDelay(10);//延时等待写入完成
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//读取数据
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ret = is24c256_read_byte(eprom_addr, &r_data);
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cm_i2c_close(EPROM_I2C_ID);
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if(ret != 0)
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{
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CM_DEMO_I2C_LOG("i2c read e2prom err:%d\n", ret);
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return -1;
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}
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CM_DEMO_I2C_LOG("i2c read e2prom,%c\n",r_data);
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CM_DEMO_I2C_LOG("i2c test end!!\n");
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return 0;
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}
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