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>
22 #if HAS_MS5607 || HAS_MS5611
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 ao_gpio_set(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, AO_MS5607_CS, 0);
34 ao_ms5607_stop(void) {
35 ao_gpio_set(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, 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];
59 for (cnt = 0; cnt < 16; cnt++) {
61 for (n_bit = 8; n_bit > 0; n_bit--) {
63 n_rem = (n_rem << 1) ^ 0x3000;
68 n_rem = (n_rem >> 12) & 0xf;
74 ao_ms5607_prom_read(struct ao_ms5607_prom *prom)
80 r = (uint16_t *) prom;
81 for (addr = 0; addr < 8; addr++) {
82 uint8_t cmd = AO_MS5607_PROM_READ(addr);
84 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
85 ao_spi_recv(r, 2, AO_MS5607_SPI_INDEX);
89 crc = ao_ms5607_crc((uint8_t *) prom);
90 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));
96 ao_panic(AO_PANIC_SELF_TEST_MS5607);
99 #if __BYTE_ORDER == __LITTLE_ENDIAN
101 r = (uint16_t *) prom;
102 for (addr = 0; addr < 8; addr++) {
104 *r++ = (t << 8) | (t >> 8);
110 ao_ms5607_setup(void)
112 if (ms5607_configured)
114 ms5607_configured = 1;
116 ao_ms5607_prom_read(&ms5607_prom);
119 static volatile uint8_t ao_ms5607_done;
124 ao_exti_disable(AO_MS5607_MISO_PORT, AO_MS5607_MISO_PIN);
126 ao_wakeup((void *) &ao_ms5607_done);
130 ao_ms5607_get_sample(uint8_t cmd) {
137 ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
139 ao_exti_enable(AO_MS5607_MISO_PORT, AO_MS5607_MISO_PIN);
141 #if AO_MS5607_PRIVATE_PINS
142 ao_spi_put(AO_MS5607_SPI_INDEX);
145 while (!ao_ms5607_done)
146 ao_sleep((void *) &ao_ms5607_done);
148 #if AO_MS5607_PRIVATE_PINS
149 stm_gpio_set(AO_MS5607_CS_PORT, AO_MS5607_CS_PIN, 1);
155 read = AO_MS5607_ADC_READ;
156 ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
157 ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
160 return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
164 ao_ms5607_sample(struct ao_ms5607_sample *sample)
166 sample->pres = ao_ms5607_get_sample(AO_MS5607_CONVERT_D1_2048);
167 sample->temp = ao_ms5607_get_sample(AO_MS5607_CONVERT_D2_2048);
171 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);
183 OFF = ((int64_t) ms5607_prom.off << 16) + (((int64_t) ms5607_prom.tco * dT) >> 7);
184 SENS = ((int64_t) ms5607_prom.sens << 15) + (((int64_t) ms5607_prom.tcs * dT) >> 8);
186 OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
187 SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
191 int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
192 int32_t TEMPM = TEMP - 2000;
193 int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
194 int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
196 int32_t TEMPP = TEMP + 1500;
197 int64_t TEMPP2 = TEMPP * TEMPP;
198 OFF2 = OFF2 + 15 * TEMPP2;
199 SENS2 = SENS2 + 8 * TEMPP2;
206 value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15;
217 ao_ms5607_sample((struct ao_ms5607_sample *) &ao_data_ring[ao_data_head].ms5607_raw);
219 AO_DATA_PRESENT(AO_DATA_MS5607);
225 __xdata struct ao_task ao_ms5607_task;
230 printf ("ms5607 reserved: %u\n", ms5607_prom.reserved);
231 printf ("ms5607 sens: %u\n", ms5607_prom.sens);
232 printf ("ms5607 off: %u\n", ms5607_prom.off);
233 printf ("ms5607 tcs: %u\n", ms5607_prom.tcs);
234 printf ("ms5607 tco: %u\n", ms5607_prom.tco);
235 printf ("ms5607 tref: %u\n", ms5607_prom.tref);
236 printf ("ms5607 tempsens: %u\n", ms5607_prom.tempsens);
237 printf ("ms5607 crc: %u\n", ms5607_prom.crc);
243 struct ao_ms5607_sample sample;
244 struct ao_ms5607_value value;
247 ao_ms5607_sample(&sample);
248 ao_ms5607_convert(&sample, &value);
249 printf ("Pressure: %8u %8d\n", sample.pres, value.pres);
250 printf ("Temperature: %8u %8d\n", sample.temp, value.temp);
251 printf ("Altitude: %ld\n", ao_pa_to_altitude(value.pres));
254 __code struct ao_cmds ao_ms5607_cmds[] = {
255 { ao_ms5607_dump, "B\0Display MS5607 data" },
258 #endif /* HAS_TASK */
263 ms5607_configured = 0;
264 ao_spi_init_cs(AO_MS5607_CS_PORT, (1 << AO_MS5607_CS_PIN));
267 ao_cmd_register(&ao_ms5607_cmds[0]);
268 ao_add_task(&ao_ms5607_task, ao_ms5607, "ms5607");
271 /* Configure the MISO pin as an interrupt; when the
272 * conversion is complete, the MS5607 will raise this
275 ao_exti_setup(AO_MS5607_MISO_PORT,
280 #ifdef STM_MODER_ALTERNATE
281 /* Reset the pin from INPUT to ALTERNATE so that SPI works
282 * This needs an abstraction at some point...
284 stm_moder_set(AO_MS5607_MISO_PORT,
286 STM_MODER_ALTERNATE);