高手帮忙，UC3C2512读I2C，读回的数据和地址一样

liuqian

现在正在用UC3C2512+DS3231（I2C RTC）
工程用的是UC3C-EK的AT24xx
修改了芯片为UC3C2512，I2C地址为0x68（DS3231的地址）
晶振是14.7456，修改define
#define FOSC0 14745600
#define BOARD_OSC0_HZ 14745600
#define FCPU_HZ 14745600
#define FPBA_HZ 14745600

主程序只作了很小修改
// main function
int main(void) {
init_sys_clocks();
init_dbg_rs232(FPBA_HZ);
print_dbg("AT24CXX Example\r\n");

irq_initialize_vectors();


twi_init();

/* Power up delay: This device needs a maximum of 230ms before it
* can be accessed. Another method would be to wait until the the
* detect line goes low but this won't work during a debugging session
* since the device is not reset.*/
cpu_delay_ms(230, FCPU_HZ);
// 不需要LED

at24cxx_init(FCPU_HZ);
//不需要写
//print_dbg("Write @0: 0x55 - @1: 0xAA");
//at24cxx_write_byte(0,0x55);
//at24cxx_write_byte(1,0xaa);
//print_dbg("- Done\r\n");

// !!! read 0x13 bytes
U8 tmp1,tmp2;
for(tmp1=0;tmp1<=0x12;tmp1++)
{
tmp2 = at24cxx_read_byte(tmp1);
print_dbg("Read @0x");
print_dbg_char_hex(tmp1);
print_dbg(": 0x");
print_dbg_char_hex(tmp2);
print_dbg("\r\n");
}
while(true);
}


串口打印的数据如下
AT24CXX Example
Read @0x00: 0x00
Read @0x01: 0x01
Read @0x02: 0x02
Read @0x03: 0x03
Read @0x04: 0x04
Read @0x05: 0x05
Read @0x06: 0x06
Read @0x07: 0x07
Read @0x08: 0x08
Read @0x09: 0x09
Read @0x0A: 0x0A
Read @0x0B: 0x0B
Read @0x0C: 0x0C
Read @0x0D: 0x0D
Read @0x0E: 0x0E
Read @0x0F: 0x0F
Read @0x10: 0x10
Read @0x11: 0x11
Read @0x12: 0x12

跟踪进去，返回值也是seccuss，但数据明显不对。搞了两天没解决，请傻孩子、火腿等高手来看看。

liuqian

改用at24cxx_read_continuous(0, 0x13, ds)读取从0－0x12共13个字节，得到
[0x00:0x00] [0x01:0x00] [0x02:0x00] [0x03:0x01] [0x04:0x01] [0x05:0x01] [0x06:0x00] [0x07:0x7D] [0x08:0x27] [0x09:0xDE] [0x0A:0xFF] [0x0B:0xFF] [0x0C:0xB3] [0x0D:0xFB] [0x0E:0x1C] [0x0F:0x8A] [0x10:0x00] [0x11:0x1A] [0x12:0x40]
看0x0E和0x0F的内容，应该是读对了，但是时钟却不走，搞不懂
这ASF也忒难用了，直接用口线模拟早就搞定了。

liuqian

写也写不进去

at24cxx_write_byte(0x0e, 0x04);
  at24cxx_write_byte(0x0f, 0x00);
  ds[0]=0x05;
  ds[1]=0x05;
  ds[2]=0x05;
  ds[3]=0x05;
  ds[4]=0x05;
  ds[5]=0x05;
  ds[6]=0x05;
  
  at24cxx_write_continuous(0x07, 7, ds);

无效

liuqian

在DS3231上并了一个24C32，读数据正确，并24C08，读出的数据不对

用at24cxx_write_continuous(0, 38, ds)写数据，地址00，01被清零，其他字节不变

程序没有改动。

我真是头大，这ASF到底是有bug还是俺不会用

liuqian

at24cxx.c中的程序

void at24cxx_write_byte(uint16_t byte_address, uint8_t byte_value) {
  uint8_t pack[3];
  twi_package_t twi_package;

  pack[0] = (byte_address&0xFF00)>>8;
  pack[1] = byte_address&0xFF;
  pack[2] = byte_value;

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 1;      <<<<<======不一样？？？
  twi_package.buffer = &pack;
  twi_package.length = sizeof(pack);

  while(twi_master_write(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);

  return;
}


void at24cxx_write_continuous(uint16_t start_address, uint16_t length, uint8_t const *wr_buffer) {
  uint8_t *pack = {0};
  twi_package_t twi_package;

  pack[0] = (start_address&0xFF00)>>8;
  pack[1] = start_address&0xFF;
  uint16_t idx;
  for (idx=0;idx<length;idx++)
    pack[2+idx] = wr_buffer[idx];

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 0;           <<<<<===== 不一样？？？
  twi_package.buffer = &pack;
  twi_package.length = sizeof(pack);

  while(twi_master_write(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);

  return;
}


uint8_t at24cxx_read_byte(uint16_t byte_address) {
uint8_t data;
  twi_package_t twi_package;

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 0;
  twi_package.buffer = &byte_address;
  twi_package.length = 2;
  while(twi_master_write(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 0;
  twi_package.buffer = &data;
  twi_package.length = 1;
  while(twi_master_read(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);


  return data;

}


void at24cxx_read_continuous(uint16_t start_address, uint16_t length, uint8_t *rd_buffer) {
  twi_package_t twi_package;

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 0;
  twi_package.buffer = &start_address;
  twi_package.length = 2;
  while(twi_master_write(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);

  twi_package.chip = AT24CXX_TWI_ADDRESS;
  twi_package.addr_length = 0;
  twi_package.buffer = rd_buffer;
  twi_package.length = length;
  while(twi_master_read(AT24CXX_TWI, &twi_package)!=TWI_SUCCESS);

}


不明白 twi_package.addr_length 是干什么用的

liuqian

终于搞定了。
AT24CXX用了双字节地址，改为单字节地址终于OK。
把TWIM和24CXX代码一行一行的仔细看了一遍，一边看一边写注释，终于了解了TWIM的设定和工作方式。这ASF为了多种CPU的兼容性和框架结构，搞的太复杂。
但是上面那个帖子提到的 twi_package.addr_length，还是没搞明白。

雨中的风铃

谢谢分享！！！