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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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14
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
* incl trise -> Thigh= 1600ns; CCR= tlow/tcycle= 0x1C,9;
* datasheet suggests 0x1e.
* 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.
*/
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);
@ -107,7 +107,7 @@ int main(void)
int i = 0;
u16 temperature;
rcc_clock_setup_in_hse_16mhz_out_72mhz();
rcc_clock_setup_in_hse_16mhz_out_72mhz();
gpio_setup();
usart_setup();
i2c_setup();
@ -140,7 +140,7 @@ int main(void)
gpio_clear(GPIOB, GPIO6); /* LED2 on */
while(1); /* Halt. */
while (1); /* Halt. */
return 0;
}

17
examples/stm32/f1/other/i2c_stts75_sensor/stts75.c
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@ -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. */
@ -75,8 +76,9 @@ void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os)
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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. */
i2c_send_data(i2c, (u8)(temp_os & 0xff00)); /* LSB */
/* 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);
@ -107,8 +109,9 @@ void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst)
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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. */
i2c_send_data(i2c, (u8)(temp_hyst & 0xff00)); /* LSB */
/* 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);
@ -154,7 +157,7 @@ u16 stts75_read_temperature(u32 i2c, u8 sensor)
/* Say to what address we want to talk to. */
i2c_send_7bit_address(i2c, sensor, I2C_READ);
/* 2-byte receive is a special case. See datasheet POS bit. */
I2C_CR1(i2c) |= (I2C_CR1_POS | I2C_CR1_ACK);
@ -165,7 +168,7 @@ u16 stts75_read_temperature(u32 i2c, u8 sensor)
reg32 = I2C_SR2(i2c);
/* Cleaning I2C_SR1_ACK. */
I2C_CR1(i2c) &= ~ I2C_CR1_ACK;
I2C_CR1(i2c) &= ~I2C_CR1_ACK;
/* Now the slave should begin to send us the first byte. Await BTF. */
while (!(I2C_SR1(i2c) & I2C_SR1_BTF));

2
examples/stm32/f1/other/i2c_stts75_sensor/stts75.h
View File

@ -32,7 +32,7 @@
#define STTS75_SENSOR7 0x4f
void stts75_write_config(u32 i2c, u8 sensor);
void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os);
void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os);
void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst);
u16 stts75_read_temperature(u32 i2c, u8 sensor);