2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 #include "ao_ms5607.h"
24 static struct ao_ms5607_prom ms5607_prom;
25 static uint8_t ms5607_configured;
28 ao_ms5607_start(void) {
29 ao_spi_get(AO_MS5607_SPI_INDEX,AO_SPI_SPEED_FAST);
30 stm_gpio_set(AO_MS5607_CS_GPIO, AO_MS5607_CS, 0);
34 ao_ms5607_stop(void) {
35 stm_gpio_set(AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
36 ao_spi_put(AO_MS5607_SPI_INDEX);
40 ao_ms5607_reset(void) {
43 cmd = AO_MS5607_RESET;
45 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
46 ao_delay(AO_MS_TO_TICKS(10));
51 ao_ms5607_crc(uint8_t *prom)
53 uint8_t crc_byte = prom[15];
60 for (cnt = 0; cnt < 16; cnt++) {
62 for (n_bit = 8; n_bit > 0; n_bit--) {
64 n_rem = (n_rem << 1) ^ 0x3000;
69 n_rem = (n_rem >> 12) & 0xf;
75 ao_ms5607_prom_read(struct ao_ms5607_prom *prom)
81 r = (uint16_t *) prom;
82 for (addr = 0; addr < 8; addr++) {
83 uint8_t cmd = AO_MS5607_PROM_READ(addr);
85 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
86 ao_spi_recv(r, 2, AO_MS5607_SPI_INDEX);
90 crc = ao_ms5607_crc((uint8_t *) prom);
91 if (crc != (((uint8_t *) prom)[15] & 0xf)) {
92 printf ("MS5607 PROM CRC error (computed %x actual %x)\n",
93 crc, (((uint8_t *) prom)[15] & 0xf));
95 ao_panic(AO_PANIC_SELF_TEST);
98 #if __BYTE_ORDER == __LITTLE_ENDIAN
100 r = (uint16_t *) prom;
101 for (addr = 0; addr < 8; addr++) {
103 *r++ = (t << 8) | (t >> 8);
109 ao_ms5607_setup(void)
111 if (ms5607_configured)
113 ms5607_configured = 1;
115 ao_ms5607_prom_read(&ms5607_prom);
118 static uint8_t ao_ms5607_done;
123 ao_exti_disable(AO_MS5607_MISO_GPIO, AO_MS5607_MISO);
125 ao_wakeup(&ao_ms5607_done);
129 ao_ms5607_get_sample(uint8_t cmd) {
137 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
138 ao_exti_enable(AO_MS5607_MISO_GPIO, AO_MS5607_MISO);
139 #if AO_MS5607_PRIVATE_PINS
140 ao_spi_put(AO_MS5607_SPI_INDEX);
143 while (!ao_ms5607_done)
144 ao_sleep(&ao_ms5607_done);
146 #if AO_MS5607_PRIVATE_PINS
147 stm_gpio_set(AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
153 read = AO_MS5607_ADC_READ;
154 ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
155 ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
158 return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
162 ao_ms5607_sample(struct ao_ms5607_sample *sample)
164 sample->pres = ao_ms5607_get_sample(AO_MS5607_CONVERT_D1_2048);
165 sample->temp = ao_ms5607_get_sample(AO_MS5607_CONVERT_D2_2048);
169 ao_ms5607_convert(struct ao_ms5607_sample *sample, struct ao_ms5607_value *value)
178 dT = sample->temp - ((int32_t) ms5607_prom.tref << 8);
180 TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23);
182 OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
184 SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
187 int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
188 int32_t TEMPM = TEMP - 2000;
189 int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
190 int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
192 int32_t TEMPP = TEMP + 1500;
193 int64_t TEMPP2 = TEMPP * TEMPP;
194 OFF2 = OFF2 + 15 * TEMPP2;
195 SENS2 = SENS2 + 8 * TEMPP2;
202 value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15;
212 ao_ms5607_sample((struct ao_ms5607_sample *) &ao_data_ring[ao_data_head].ms5607_raw);
214 AO_DATA_PRESENT(AO_DATA_MS5607);
220 __xdata struct ao_task ao_ms5607_task;
225 printf ("ms5607 reserved: %u\n", ms5607_prom.reserved);
226 printf ("ms5607 sens: %u\n", ms5607_prom.sens);
227 printf ("ms5607 off: %u\n", ms5607_prom.off);
228 printf ("ms5607 tcs: %u\n", ms5607_prom.tcs);
229 printf ("ms5607 tco: %u\n", ms5607_prom.tco);
230 printf ("ms5607 tref: %u\n", ms5607_prom.tref);
231 printf ("ms5607 tempsens: %u\n", ms5607_prom.tempsens);
232 printf ("ms5607 crc: %u\n", ms5607_prom.crc);
238 struct ao_data sample;
239 struct ao_ms5607_value value;
241 ao_data_get(&sample);
242 ao_ms5607_convert(&sample.ms5607_raw, &value);
243 printf ("Pressure: %8u %8d\n", sample.ms5607_raw.pres, value.pres);
244 printf ("Temperature: %8u %8d\n", sample.ms5607_raw.temp, value.temp);
245 printf ("Altitude: %ld\n", ao_pa_to_altitude(value.pres));
248 __code struct ao_cmds ao_ms5607_cmds[] = {
249 { ao_ms5607_dump, "B\0Display MS5607 data" },
256 ms5607_configured = 0;
257 ao_cmd_register(&ao_ms5607_cmds[0]);
258 ao_spi_init_cs(AO_MS5607_CS_GPIO, (1 << AO_MS5607_CS));
260 ao_add_task(&ao_ms5607_task, ao_ms5607, "ms5607");
262 /* Configure the MISO pin as an interrupt; when the
263 * conversion is complete, the MS5607 will raise this
266 ao_exti_setup(AO_MS5607_MISO_GPIO,
271 /* Reset the pin from INPUT to ALTERNATE so that SPI works
272 * This needs an abstraction at some point...
274 stm_moder_set(AO_MS5607_MISO_GPIO,
276 STM_MODER_ALTERNATE);