i2c 读取无法发送 nack 和停止位
发布于 2022-09-11 21: 58: 04
读取和写入的逻辑分析仪波形如上图
代码如下
void QMC5883_Write (u8 addr, u8 data)
{
tls_i2c_write_byte (QMC5883_SlaveAddress, 1) ;
tls_i2c_wait_ack () ;
tls_i2c_write_byte (addr, 0) ;
tls_i2c_wait_ack () ;
tls_i2c_write_byte (data, 0) ;
tls_i2c_wait_ack () ;
tls_i2c_stop () ; }
u8 QMC5883_Read_Byte (u8 addr)
{
uint8_t data;
tls_i2c_write_byte (QMC5883_SlaveAddress, 1) ;
tls_i2c_wait_ack () ;
tls_i2c_write_byte (addr, 0) ;
tls_i2c_wait_ack () ;
tls_i2c_write_byte (QMC5883_SlaveAddress+1, 0) ;
tls_i2c_wait_ack () ;
data = tls_i2c_read_byte (0, 1) ;
return data; }
写入可以正常产生停止位, 但是读取无法产生, 使用的是 w800 的最新库函数.
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