From d1b04bca651f504372d330d618eb59588392e2a6 Mon Sep 17 00:00:00 2001
From: Martin Ling <martin-card10@earth.li>
Date: Tue, 20 Aug 2019 20:38:22 +0000
Subject: [PATCH] feat(trng): Add TRNG read to Epicardium API
---
epicardium/ble/ble.c | 3 +--
epicardium/epicardium.h | 20 ++++++++++++++++++++
epicardium/modules/hardware.c | 1 +
epicardium/modules/meson.build | 1 +
epicardium/modules/trng.c | 12 ++++++++++++
5 files changed, 35 insertions(+), 2 deletions(-)
create mode 100644 epicardium/modules/trng.c
diff --git a/epicardium/ble/ble.c b/epicardium/ble/ble.c
index 52c4f1a9b..a667f9d1f 100644
--- a/epicardium/ble/ble.c
+++ b/epicardium/ble/ble.c
@@ -8,7 +8,6 @@
#include "ble_api.h"
#include "hci_vs.h"
#include "att_api.h"
-#include "trng.h"
#include "FreeRTOS.h"
#include "timers.h"
@@ -101,7 +100,7 @@ static void setAddress(void)
bdAddr[0] = 0xCA;
bdAddr[1] = 0x4D;
bdAddr[2] = 0x10;
- TRNG_Read(MXC_TRNG, bdAddr + 3, 3);
+ epic_trng_read(bdAddr + 3, 3);
sprintf(buf,
"%02x:%02x:%02x:%02x:%02x:%02x\n",
bdAddr[0],
diff --git a/epicardium/epicardium.h b/epicardium/epicardium.h
index 88712b176..7ecf9b571 100644
--- a/epicardium/epicardium.h
+++ b/epicardium/epicardium.h
@@ -98,6 +98,9 @@ typedef _Bool bool;
#define API_GPIO_GET_PIN_MODE 0xA1
#define API_GPIO_WRITE_PIN 0xA2
#define API_GPIO_READ_PIN 0xA3
+
+#define API_TRNG_READ 0xB0
+
/* clang-format on */
typedef uint32_t api_int_id_t;
@@ -1209,4 +1212,21 @@ API(API_RTC_SCHEDULE_ALARM, int epic_rtc_schedule_alarm(uint32_t timestamp));
*/
API_ISR(EPIC_INT_RTC_ALARM, epic_isr_rtc_alarm);
+/**
+ * TRNG
+ * ====
+ */
+
+/**
+ * Read random bytes from the TRNG.
+ *
+ * :param uint8_t * dest: Destination buffer
+ * :param size: Number of bytes to read.
+ * :return: `0` on success or a negative value if an error occured. Possible
+ * errors:
+ *
+ * - ``-EFAULT``: Invalid destination address.
+ */
+API(API_TRNG_READ, int epic_trng_read(uint8_t *dest, size_t size));
+
#endif /* _EPICARDIUM_H */
diff --git a/epicardium/modules/hardware.c b/epicardium/modules/hardware.c
index 5453801eb..3905ceb81 100644
--- a/epicardium/modules/hardware.c
+++ b/epicardium/modules/hardware.c
@@ -18,6 +18,7 @@
#include "gpio.h"
#include "i2c.h"
#include "spi.h"
+#include "trng.h"
/*
* Early init is called at the very beginning and is meant for modules which
diff --git a/epicardium/modules/meson.build b/epicardium/modules/meson.build
index 61e0cc634..31e7f5c07 100644
--- a/epicardium/modules/meson.build
+++ b/epicardium/modules/meson.build
@@ -13,5 +13,6 @@ module_sources = files(
'rtc.c',
'serial.c',
'stream.c',
+ 'trng.c',
'vibra.c',
)
diff --git a/epicardium/modules/trng.c b/epicardium/modules/trng.c
new file mode 100644
index 000000000..7faa2909c
--- /dev/null
+++ b/epicardium/modules/trng.c
@@ -0,0 +1,12 @@
+#include "epicardium.h"
+#include "trng.h"
+
+int epic_trng_read(uint8_t *dest, size_t size)
+{
+ if (dest == NULL)
+ return -EFAULT;
+
+ TRNG_Read(MXC_TRNG, dest, size);
+
+ return 0;
+}
--
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