From 9d87c925a9eaa4fc256be3173c14a20d1469472d Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Wed, 9 Sep 2020 11:53:37 +0100
Subject: everything, mostly, working

---
 boiler-monster/stm32/app/adc.c | 154 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 boiler-monster/stm32/app/adc.c

(limited to 'boiler-monster/stm32/app/adc.c')

diff --git a/boiler-monster/stm32/app/adc.c b/boiler-monster/stm32/app/adc.c
new file mode 100644
index 0000000..2cfc4e3
--- /dev/null
+++ b/boiler-monster/stm32/app/adc.c
@@ -0,0 +1,154 @@
+#include "project.h"
+
+#define T do { printf("%s:%d\r\n",__FILE__,__LINE__); } while (0)
+
+void adc_dump (void)
+{
+  printf ("ADC_SR %x ADC_CR1 %x ADC_CR2 %x\r\n", (unsigned) ADC_SR (ADC1),
+          (unsigned) ADC_CR1 (ADC1),
+          (unsigned) ADC_CR2 (ADC1));
+
+}
+
+
+volatile unsigned timeout;
+
+
+void adc_tick (void)
+{
+  if (timeout) timeout--;
+}
+
+
+static int adc_wait (volatile uint32_t *reg, uint32_t wait_while_set, uint32_t  wait_while_clear, unsigned ms)
+{
+  timeout = MS_TO_TICKS (ms);
+
+
+  while ((*reg) & wait_while_set)
+    if (!timeout) {
+      printf ("QADC timeout\r\n");
+      return -1;
+    }
+
+
+  while ((~ (*reg)) & wait_while_clear)
+    if (!timeout) {
+      printf ("QADC timeout\r\n");
+      return -1;
+    }
+
+
+  return 0;
+}
+
+
+
+int adc_calibrate (void)
+{
+  adc_off (ADC1);
+  adc_power_on (ADC1);
+  delay_ms (5);
+
+  ADC_CR2 (ADC1) |= ADC_CR2_RSTCAL;
+
+  if (adc_wait (&ADC_CR2 (ADC1), ADC_CR2_CAL, 0, 2)) return -1;
+
+  ADC_CR2 (ADC1) |= ADC_CR2_CAL;
+
+  if (adc_wait (&ADC_CR2 (ADC1), ADC_CR2_CAL, 0, 2)) return -1;
+
+  return 0;
+}
+
+
+
+int adc_convert_start (unsigned channel)
+{
+  uint8_t ch = channel;
+
+  adc_set_regular_sequence (ADC1, 1, &ch);
+
+  /* Start conversion on regular channels. */
+  ADC_CR2 (ADC1) |= ADC_CR2_SWSTART;
+
+#if 0
+  if (adc_wait (&ADC_CR2 (ADC1), ADC_CR2_SWSTART, 0, 2))
+    return -1;
+#endif
+
+  return 0;
+}
+
+
+
+int adc_convert_done(void)
+{
+
+  if (ADC_SR(ADC1) & ADC_SR_EOC) 
+	return 1;
+
+  return 0;
+}
+
+unsigned adc_convert_get(void)
+{
+  return adc_read_regular (ADC1);
+}
+
+
+unsigned adc_convert (unsigned channel)
+{
+  uint8_t ch = channel;
+
+  adc_calibrate();
+
+  adc_set_regular_sequence (ADC1, 1, &ch);
+
+  /* Start conversion on regular channels. */
+  ADC_CR2 (ADC1) |= ADC_CR2_SWSTART;
+
+  if (adc_wait (&ADC_CR2 (ADC1), ADC_CR2_SWSTART, 0, 2))
+    return 0;
+
+  if (adc_wait (&ADC_SR (ADC1), 0, ADC_SR_EOC, 2))
+    return 0;
+
+  return adc_read_regular (ADC1);
+}
+
+void adc_init (void)
+{
+  /* main set ADC clock is 9Mhz */
+
+  adc_dump();
+
+  adc_off (ADC1);
+  rcc_periph_clock_enable (RCC_ADC1);
+#if 0
+  rcc_peripheral_reset (&RCC_APB2RSTR, RCC_APB2RSTR_ADC1RST);
+  rcc_peripheral_clear_reset (&RCC_APB2RSTR, RCC_APB2RSTR_ADC1RST);
+#endif
+
+  adc_set_dual_mode (ADC_CR1_DUALMOD_IND);
+  adc_disable_scan_mode (ADC1);
+  adc_enable_temperature_sensor (ADC1);
+  adc_set_single_conversion_mode (ADC1);
+
+  adc_set_sample_time (ADC1, ADC_CHANNEL0, ADC_SMPR_SMP_239DOT5CYC);
+  adc_set_sample_time (ADC1, ADC_CHANNEL17, ADC_SMPR_SMP_239DOT5CYC); /*Want 17.1uS , which is 154 cycles */
+  adc_enable_external_trigger_regular (ADC1, ADC_CR2_EXTSEL_SWSTART);
+
+  adc_set_right_aligned (ADC1);
+
+
+  adc_dump();
+
+  adc_calibrate();
+
+  adc_dump();
+
+
+
+}
+
-- 
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