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authorKarl Palsson <karlp@tweak.net.au>2017-03-08 23:02:25 +0000
committerKarl Palsson <karlp@tweak.net.au>2017-03-08 23:06:00 +0000
commita2785bdf764a446b03f1a46af92382e32950dfff (patch)
treea9920ffec84a951c97182eb2ed098f0bfb618aeb /tests/i2c-master
parentd6e9b188c71131cf0745b3b25d033a5e16db886e (diff)
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i2c-master: first hack working on f0
read_i2c and write_i2c are not flexible enough, and terribly named. they're going to have to go, but they're a nice start for some things.
Diffstat (limited to 'tests/i2c-master')
-rw-r--r--tests/i2c-master/i2c-master.c30
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);
} \ No newline at end of file