altos: Add DMA, SPI and MS5607 drivers

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 164 insertions, 0 deletions

diff --git a/src/drivers/ao_ms5607.c b/src/drivers/ao_ms5607.c
new file mode 100644
index 00000000..970fea1e
--- /dev/null
+++ b/src/drivers/ao_ms5607.c
@@ -0,0 +1,164 @@
+/*
+ * 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);
+}