diff options
Diffstat (limited to 'tests/i2c-master')
| -rw-r--r-- | tests/i2c-master/i2c-master.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/tests/i2c-master/i2c-master.c b/tests/i2c-master/i2c-master.c index 5f13ddc..a1e0fa7 100644 --- a/tests/i2c-master/i2c-master.c +++ b/tests/i2c-master/i2c-master.c @@ -29,19 +29,30 @@ void i2cm_init(void) { rcc_periph_clock_enable(hw_details.periph_rcc); rcc_periph_reset_pulse(hw_details.periph_rst); - i2c_set_standard_mode(hw_details.periph); // i2c_enable_ack(hw_details.periph); /* NO ACK FOR SHT21! */ //i2c_set_dutycycle(hw_details.periph, I2C_CCR_DUTY_DIV2); /* default, no need to do this really */ +#if defined I2C_SR2 i2c_set_clock_frequency(hw_details.periph, hw_details.i2c_clock_megahz); + i2c_set_standard_mode(hw_details.periph); /* x Mhz / (100kHz * 2) */ i2c_set_ccr(hw_details.periph, hw_details.i2c_clock_megahz * 5); /* Sm mode, (100kHz) freqMhz + 1 */ i2c_set_trise(hw_details.periph, hw_details.i2c_clock_megahz + 1); +#else + // V2 periph + // See Table 85. Examples of timings settings for f I2CCLK = 48 MHz + i2c_set_prescaler(hw_details.periph, 0xb); // 11 +1 = 2, so 4Mhz input + i2c_set_scl_low_period(hw_details.periph, 0x13); + i2c_set_scl_high_period(hw_details.periph, 0xF); + i2c_set_data_hold_time(hw_details.periph, 0x2); + i2c_set_data_setup_time(hw_details.periph, 0x4); +#endif i2c_peripheral_enable(hw_details.periph); } +#if defined I2C_SR2 static void sht21_send_data(uint32_t i2c, size_t n, uint8_t *data) { while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) { @@ -124,6 +135,7 @@ static void sht21_readn(uint32_t i2c, int n, uint8_t *res) return; } +#endif static float sht21_convert_temp(uint16_t raw) { @@ -141,6 +153,7 @@ static float sht21_convert_humi(uint16_t raw) return tf; } +#if 0 static float sht21_read_temp_hold(uint32_t i2c) { // gpio_set(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); @@ -169,18 +182,24 @@ static float sht21_read_humi_hold(uint32_t i2c) // gpio_clear(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); return sht21_convert_humi(left); } +#endif static void sht21_readid(void) { - sht21_send_cmd(I2C1, SHT21_CMD_READ_REG); uint8_t raw = 0; +#if defined I2C_SR2 + sht21_send_cmd(I2C1, SHT21_CMD_READ_REG); sht21_readn(I2C1, 1, &raw); +#else + read_i2c(hw_details.periph, SENSOR_ADDRESS, SHT21_CMD_READ_REG, 1, &raw); +#endif printf("raw user reg = %#x\n", raw); int resolution = ((raw & 0x80) >> 6) | (raw & 1); printf("temp resolution is in %d bits\n", 14 - resolution); printf("battery status: %s\n", (raw & (1 << 6) ? "failing" : "good")); printf("On chip heater: %s\n", (raw & 0x2) ? "on" : "off"); +#if 0 uint8_t req1[] = {0xfa, 0x0f}; uint8_t res[8]; sht21_send_data(I2C1, 2, req1); @@ -191,15 +210,16 @@ static void sht21_readid(void) sht21_readn(I2C1, sizeof(res), res2); printf("Serial = %02x%02x %02x%02x %02x%02x %02x%02x\n", res2[3], res2[4], res[0], res[2], res[4], res[6], res2[0], res2[1]); +#endif } void i2cm_task(void) { gpio_set(hw_details.trigger_port, hw_details.trigger_pin); sht21_readid(); - float temp = sht21_read_temp_hold(I2C1); - float humi = sht21_read_humi_hold(I2C1); +// float temp = sht21_read_temp_hold(I2C1); +// float humi = sht21_read_humi_hold(I2C1); gpio_clear(hw_details.trigger_port, hw_details.trigger_pin); - printf("Temp: %f C, RH: %f\n", temp, humi); +// printf("Temp: %f C, RH: %f\n", temp, humi); }
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