From 5a7cc7c9c7cc4b2ebac1fcfdc26f4dc88773391b Mon Sep 17 00:00:00 2001
From: schneider <schneider@blinkenlichts.net>
Date: Sat, 17 Oct 2020 02:14:17 +0200
Subject: [PATCH] change(spo2): Allocate buffers on heap
---
pycardium/modules/spo2_algo.c | 23 +++++++++++++++++------
pycardium/mpconfigport.h | 1 +
2 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/pycardium/modules/spo2_algo.c b/pycardium/modules/spo2_algo.c
index 04a6f2c32..27daa2e30 100644
--- a/pycardium/modules/spo2_algo.c
+++ b/pycardium/modules/spo2_algo.c
@@ -5,10 +5,13 @@
#include "py/obj.h"
#include "py/runtime.h"
-static mp_obj_t mp_maxim_rd177(mp_obj_t ir, mp_obj_t red)
-{
+struct spo2_memory {
uint32_t pun_ir_buffer[500];
uint32_t pun_red_buffer[500];
+};
+
+static mp_obj_t mp_maxim_rd177(mp_obj_t ir, mp_obj_t red)
+{
int32_t n_ir_buffer_length;
int32_t pn_spo2 = 0;
@@ -39,16 +42,24 @@ static mp_obj_t mp_maxim_rd177(mp_obj_t ir, mp_obj_t red)
);
}
+ struct spo2_memory *m =
+ (struct spo2_memory *)MP_STATE_PORT(spo2_memory);
+ if (!m) {
+ /* Will raise an exception if out of memory: */
+ m = m_malloc(sizeof(struct spo2_memory));
+ MP_STATE_PORT(spo2_memory) = m;
+ }
+
n_ir_buffer_length = ir_len;
for (size_t i = 0; i < ir_len; i++) {
- pun_ir_buffer[i] = mp_obj_get_int(ir_elem[i]);
- pun_red_buffer[i] = mp_obj_get_int(red_elem[i]);
+ m->pun_ir_buffer[i] = mp_obj_get_int(ir_elem[i]);
+ m->pun_red_buffer[i] = mp_obj_get_int(red_elem[i]);
}
maxim_heart_rate_and_oxygen_saturation(
- pun_ir_buffer,
+ m->pun_ir_buffer,
n_ir_buffer_length,
- pun_red_buffer,
+ m->pun_red_buffer,
&pn_spo2,
&pch_spo2_valid,
&pn_heart_rate,
diff --git a/pycardium/mpconfigport.h b/pycardium/mpconfigport.h
index c9f687ac4..57bf8ed80 100644
--- a/pycardium/mpconfigport.h
+++ b/pycardium/mpconfigport.h
@@ -114,4 +114,5 @@ typedef long mp_off_t;
#define MICROPY_PORT_ROOT_POINTERS \
const char *readline_hist[16]; \
mp_obj_t interrupt_callbacks[EPIC_INT_NUM]; \
+ void *spo2_memory; \
--
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