altos: Use 384 cycle ADC sample time

This is plenty fast, and provides nice stable readings.

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

diff --git a/src/stm/ao_adc_stm.c b/src/stm/ao_adc_stm.c
index 1722a9ecdf0698e555969891867f468ea8bf5451..d758e629bac7461eae6ed52097f19e6d78afb620 100644 (file)
--- a/src/stm/ao_adc_stm.c
+++ b/src/stm/ao_adc_stm.c
@@ -28,11 +28,11 @@ static uint8_t                      ao_adc_ready;
                                 (0 << STM_ADC_CR2_JWSTART) |           \
                                 (STM_ADC_CR2_JEXTEN_DISABLE << STM_ADC_CR2_JEXTEN) | \
                                 (0 << STM_ADC_CR2_JEXTSEL) |           \
-                                (1 << STM_ADC_CR2_ALIGN) |             \
+                                (0 << STM_ADC_CR2_ALIGN) |             \
                                 (0 << STM_ADC_CR2_EOCS) |              \
                                 (1 << STM_ADC_CR2_DDS) |               \
                                 (1 << STM_ADC_CR2_DMA) |               \
-                                (STM_ADC_CR2_DELS_NONE << STM_ADC_CR2_DELS) | \
+                                (STM_ADC_CR2_DELS_UNTIL_READ << STM_ADC_CR2_DELS) | \
                                 (0 << STM_ADC_CR2_CONT) |              \
                                 (1 << STM_ADC_CR2_ADON))
 
@@ -168,10 +168,10 @@ ao_adc_init(void)
                       (0 << STM_ADC_CR1_EOCIE ) |
                       (0 << STM_ADC_CR1_AWDCH ));
 
-       /* 4 cycle sample time for everyone */
-       stm_adc.smpr1 = 0;
-       stm_adc.smpr2 = 0;
-       stm_adc.smpr3 = 0;
+       /* 384 cycle sample time for everyone */
+       stm_adc.smpr1 = 0x3ffff;
+       stm_adc.smpr2 = 0x3fffffff;
+       stm_adc.smpr3 = 0x3fffffff;
 
        stm_adc.sqr1 = ((AO_NUM_ADC - 1) << 20);
        stm_adc.sqr2 = 0;