--- /dev/null
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao.h>
+#include "ao_ms5607.h"
+
+#define AO_MS5607_CS_GPIO stm_gpioc
+#define AO_MS5607_CS 4
+#define AO_MS5607_CS_MASK (1 << AO_MS5607_CS)
+#define AO_MS5607_SPI_INDEX (STM_SPI_INDEX(1))
+
+struct ms5607_prom {
+ uint16_t reserved;
+ uint16_t sens;
+ uint16_t off;
+ uint16_t tcs;
+ uint16_t tco;
+ uint16_t tref;
+ uint16_t tempsens;
+ uint16_t crc;
+};
+
+static struct ms5607_prom ms5607_prom;
+
+static void
+ao_ms5607_start(void) {
+ ao_spi_get(AO_MS5607_SPI_INDEX);
+ stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 0);
+}
+
+static void
+ao_ms5607_stop(void) {
+ stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
+ ao_spi_put(AO_MS5607_SPI_INDEX);
+}
+
+static void
+ao_ms5607_reset(void) {
+ uint8_t cmd;
+
+ cmd = AO_MS5607_RESET;
+ ao_ms5607_start();
+ ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
+ ao_ms5607_stop();
+}
+
+static uint16_t
+ao_ms5607_prom_read(uint8_t addr)
+{
+ uint8_t cmd = AO_MS5607_PROM_READ(addr);
+ uint8_t d[2];
+
+ ao_ms5607_start();
+ ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
+ ao_spi_recv(d, 2, AO_MS5607_SPI_INDEX);
+ ao_ms5607_stop();
+ return ((uint16_t) d[0] << 8) | (uint16_t) d[1];
+}
+
+static void
+ao_ms5607_init_chip(void) {
+ uint8_t addr;
+ uint16_t *prom;
+ ao_ms5607_reset();
+ prom = &ms5607_prom.reserved;
+
+ for (addr = 0; addr <= 7; addr++)
+ prom[addr] = ao_ms5607_prom_read(addr);
+}
+
+static uint32_t
+ao_ms5607_convert(uint8_t cmd) {
+ uint8_t reply[3];
+ uint8_t read;
+
+ ao_ms5607_start();
+ ao_spi_send(&cmd, 1, AO_MS5607_SPI_INDEX);
+ ao_ms5607_stop();
+
+ ao_delay(AO_MS_TO_TICKS(200));
+
+ ao_ms5607_start();
+ read = AO_MS5607_ADC_READ;
+ ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
+ ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
+ ao_ms5607_stop();
+
+ return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
+}
+
+static void
+ao_ms5607_dump(void)
+{
+ uint8_t addr;
+ uint32_t d1, d2;
+ int32_t dT;
+ int32_t TEMP;
+ int64_t OFF;
+ int64_t SENS;
+ int32_t P;
+
+ ao_ms5607_init_chip();
+ printf ("reserved: %d\n", ms5607_prom.reserved);
+ printf ("sens: %d\n", ms5607_prom.sens);
+ printf ("off: %d\n", ms5607_prom.off);
+ printf ("tcs: %d\n", ms5607_prom.tcs);
+ printf ("tco: %d\n", ms5607_prom.tco);
+ printf ("tref: %d\n", ms5607_prom.tref);
+ printf ("tempsens: %d\n", ms5607_prom.tempsens);
+ printf ("crc: %d\n", ms5607_prom.crc);
+ d1 = ao_ms5607_convert(AO_MS5607_CONVERT_D1_4096);
+ printf ("Conversion D1: %d\n", d1);
+ d2 = ao_ms5607_convert(AO_MS5607_CONVERT_D2_4096);
+ printf ("Conversion D2: %d\n", d2);
+
+ dT = d2 - ((int32_t) ms5607_prom.tref << 8);
+
+ TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23);
+
+ OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
+
+ SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
+
+ if (TEMP < 2000) {
+ int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
+ int32_t TEMPM = TEMP - 2000;
+ int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
+ int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
+ }
+
+ P = ((((int64_t) d1 * SENS) >> 21) - OFF) >> 15;
+
+ printf ("Temperature: %d", TEMP);
+ printf ("Pressure %d\n", P);
+}
+
+__code struct ao_cmds ao_ms5607_cmds[] = {
+ { ao_ms5607_dump, "p\0Display MS5607 data" },
+ { 0, NULL },
+};
+
+void
+ao_ms5607_init(void)
+{
+ ao_cmd_register(&ao_ms5607_cmds[0]);
+
+ stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOCEN);
+ stm_gpio_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, 1);
+ stm_moder_set(&AO_MS5607_CS_GPIO, AO_MS5607_CS, STM_MODER_OUTPUT);
+}