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authorjaseg <git@jaseg.net>2018-07-17 15:43:26 +0200
committerjaseg <git@jaseg.net>2018-07-17 15:43:26 +0200
commit6df66b77ba5b27bce5630694742f2dac57b8d3eb (patch)
treefc14370fdea41b6d7a672758aa89886b9107f78c /tests/i2c-master/i2c-master.c
parent90ce052d82daa86e1e86ab4dac7fbba0cdda8680 (diff)
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Isolate usb-serial-rs485 tree
Diffstat (limited to 'tests/i2c-master/i2c-master.c')
-rw-r--r--tests/i2c-master/i2c-master.c121
1 files changed, 0 insertions, 121 deletions
diff --git a/tests/i2c-master/i2c-master.c b/tests/i2c-master/i2c-master.c
deleted file mode 100644
index 3adbbf0..0000000
--- a/tests/i2c-master/i2c-master.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Feb 2017, Karl Palsson <karlp@tweak.net.au>
- */
-
-#include <stddef.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <libopencm3/stm32/i2c.h>
-#include <libopencm3/stm32/gpio.h>
-#include <libopencm3/stm32/rcc.h>
-#include "trace.h"
-#include "hw.h"
-#include "i2c-master.h"
-
-#define SENSOR_ADDRESS (0x40)
-
-enum sht21_cmd_e {
- SHT21_CMD_TEMP_HOLD = 0xe3,
- SHT21_CMD_HUMIDITY_HOLD = 0xe5,
- SHT21_CMD_TEMP_NOHOLD = 0xf3,
- SHT21_CMD_HUMIDITY_NOHOLD = 0xf5,
- SHT21_CMD_WRITE_REG = 0xe6,
- SHT21_CMD_READ_REG = 0xe7,
- SHT21_CMD_RESET = 0xfe,
- /* 0xfa, 0x0f to read serial */
-};
-
-
-void i2cm_init(void)
-{
- rcc_periph_clock_enable(hw_details.periph_rcc);
- rcc_periph_reset_pulse(hw_details.periph_rst);
-
- i2c_set_speed(hw_details.periph, i2c_speed_sm_100k, hw_details.i2c_clock_megahz);
- //i2c_set_speed(hw_details.periph, i2c_speed_fm_400k, hw_details.i2c_clock_megahz);
-
- i2c_peripheral_enable(hw_details.periph);
-}
-
-
-static float sht21_convert_temp(uint16_t raw)
-{
- //assert((raw & 0x2) == 0x2);
- raw &= ~0x3; /* Clear lower status bits */
- float tf = -46.85 + 175.72 * ((float) raw / 65536.0);
- return tf;
-}
-
-static float sht21_convert_humi(uint16_t raw)
-{
- //assert((raw & 0x2) == 0);
- raw &= ~0x3; /* Clear lower status bits */
- float tf = -6 + 125 * ((float) raw / 65536.0);
- return tf;
-}
-
-static float sht21_read_temp_hold(uint32_t i2c)
-{
- uint8_t data[3];
- uint8_t cmd = SHT21_CMD_TEMP_HOLD;
- i2c_transfer7(i2c, SENSOR_ADDRESS, &cmd, 1, data, sizeof(data));
- uint8_t crc = data[2];
- uint16_t temp = data[0] << 8 | data[1];
- // TODO - calcualte CRC and check!
- printf("CRC=%#x, data0=%#x, data1=%#x\n", crc, data[0], data[1]);
- return sht21_convert_temp(temp);
-}
-
-static float sht21_read_humi_hold(uint32_t i2c)
-{
- uint8_t data[3];
- uint8_t cmd = SHT21_CMD_HUMIDITY_HOLD;
- i2c_transfer7(i2c, SENSOR_ADDRESS, &cmd, 1, data, sizeof(data));
-
- uint8_t crc = data[2];
- uint16_t left = data[0] << 8 | data[1];
- // TODO - calcualte CRC and check!
- printf("CRC=%#x, data0=%#x, data1=%#x\n", crc, data[0], data[1]);
- return sht21_convert_humi(left);
-}
-
-static void sht21_readid(void)
-{
- uint8_t raw = 0;
- uint8_t cmd = SHT21_CMD_READ_REG;
- printf("RP...");
- i2c_transfer7(hw_details.periph, SENSOR_ADDRESS, &cmd, 1, &raw, 1);
- printf("..S/S\n");
- // or, with stop/start
- i2c_transfer7(hw_details.periph, SENSOR_ADDRESS, &cmd, 1, 0, 0);
- i2c_transfer7(hw_details.periph, SENSOR_ADDRESS, 0, 0, &raw, 1);
-
- 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");
-
- uint8_t req1[] = {0xfa, 0x0f};
- uint8_t res[8];
- i2c_transfer7(hw_details.periph, SENSOR_ADDRESS, req1, sizeof(req1), res, 8);
- uint8_t req2[] = {0xfc, 0xc9};
- uint8_t res2[8];
- i2c_transfer7(hw_details.periph, SENSOR_ADDRESS, req1, sizeof(req1), res2, 8);
-
- 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]);
-}
-
-void i2cm_task(void)
-{
- static int i = 1;
- printf(">>>>Starting iteration %d\n", i++);
- gpio_set(hw_details.trigger_port, hw_details.trigger_pin);
- sht21_readid();
- float temp = sht21_read_temp_hold(hw_details.periph);
- float humi = sht21_read_humi_hold(hw_details.periph);
- gpio_clear(hw_details.trigger_port, hw_details.trigger_pin);
- printf("Temp: %f C, RH: %f\n", temp, humi);
-
-} \ No newline at end of file