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other/i2c_stts75_sensor: Cosmetics.

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This commit is contained in:
Uwe Hermann 2011-11-13 09:00:28 +01:00
parent 53a0c44bfd
commit 8a77630997
3 changed files with 18 additions and 15 deletions
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8
examples/stm32/f1/other/i2c_stts75_sensor/i2c_stts75_sensor.c
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@ -79,16 +79,16 @@ void i2c_setup(void)
i2c_set_fast_mode(I2C2);
/*
* fclock for I2C is 36MHz APB2 -> cycle time 28ns, low time at 400KHz
* fclock for I2C is 36MHz APB2 -> cycle time 28ns, low time at 400kHz
* incl trise -> Thigh = 1600ns; CCR = tlow/tcycle = 0x1C,9;
* datasheet suggests 0x1e.
* Datasheet suggests 0x1e.
*/
i2c_set_ccr(I2C2, 0x1e);
/*
* fclock for I2C is 36MHz -> cycle time 28ns, rise time for
* 400KHz => 300ns and 100KHz => 1000ns; 300ns/28ns = 10;
* incremented by 1 -> 11.
* 400kHz => 300ns and 100kHz => 1000ns; 300ns/28ns = 10;
* Incremented by 1 -> 11.
*/
i2c_set_trise(I2C2, 0x0b);

9
examples/stm32/f1/other/i2c_stts75_sensor/stts75.c
View File

@ -43,7 +43,8 @@ void stts75_write_config(u32 i2c, u8 sensor)
/* Sending the data. */
i2c_send_data(i2c, 0x1); /* stts75 config register */
while (!(I2C_SR1(i2c) & I2C_SR1_BTF)); /* Await ByteTransferedFlag. */
i2c_send_data(i2c, 0x4); /* pol reverse - LED glows if temp is below Tos/Thyst */
/* Polarity reverse - LED glows if temp is below Tos/Thyst. */
i2c_send_data(i2c, 0x4);
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
/* Send STOP condition. */
@ -76,7 +77,8 @@ void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os)
i2c_send_data(i2c, (u8)(temp_os >> 8)); /* MSB */
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
i2c_send_data(i2c, (u8)(temp_os & 0xff00)); /* LSB */
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
/* After the last byte we have to wait for TxE too. */
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
/* Send STOP condition. */
i2c_send_stop(i2c);
@ -108,7 +110,8 @@ void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst)
i2c_send_data(i2c, (u8)(temp_hyst >> 8)); /* MSB */
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
i2c_send_data(i2c, (u8)(temp_hyst & 0xff00)); /* LSB */
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
/* After the last byte we have to wait for TxE too. */
while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
/* Send STOP condition. */
i2c_send_stop(i2c);