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[NUCLEO_F030R8] enhance I2C master

pull/310/head
dbestm 2014-05-19 09:57:58 +02:00
parent cd5cb4ab34
commit 6484358e33
1 changed files with 20 additions and 12 deletions
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32
libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/i2c_api.c
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@ -178,12 +178,13 @@ inline int i2c_stop(i2c_t *obj) {
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
int count;
int timeout;
int value;
if (length == 0) return 0;
// Configure slave address, nbytes, reload, end mode and start or stop generation
I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Read);
// Read all bytes
for (count = 0; count < length; count++) {
@ -191,33 +192,40 @@ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
data[count] = (char)value;
}
timeout = FLAG_TIMEOUT;
while(!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
timeout--;
if (timeout == 0) return 0;
}
if(stop) i2c_stop(obj);
return length;
}
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
//int timeout;
int timeout;
int count;
if (length == 0) return 0;
// Configure slave address, nbytes, reload, end mode and start or stop generation
if (stop) {
I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Write);
}
else {
// Configure slave address, nbytes, reload, end mode and start generation
I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
}
// Write all bytes
for (count = 0; count < length; count++) {
if (i2c_byte_write(obj, data[count]) != 1) {
if(!stop) i2c_stop(obj);
return 0;
i2c_byte_write(obj, data[count]);
}
timeout = FLAG_TIMEOUT;
while(!I2C_GetFlagStatus(i2c, I2C_FLAG_TC)) {
timeout--;
if (timeout == 0) return 0;
}
if(stop) i2c_stop(obj);
return count;
}