From 06cf23794d752755fc8ce2fdafed6d521298ad77 Mon Sep 17 00:00:00 2001
From: schneider <schneider@blinkenlichts.net>
Date: Fri, 3 May 2019 01:04:28 +0200
Subject: [PATCH] feat(i2c): scan bus in hello world
---
Hello_World/Makefile | 2 ++
Hello_World/main.c | 28 +++++++++++++++++++++++++++-
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/Hello_World/Makefile b/Hello_World/Makefile
index 2efde347..f399063a 100644
--- a/Hello_World/Makefile
+++ b/Hello_World/Makefile
@@ -90,6 +90,8 @@ PROJ_CFLAGS+=-DMXC_ASSERT_ENABLE
#PROJ_CFLAGS+=--specs=nano.specs
#PROJ_LDFLAGS+=--specs=nano.specs
+PROJ_CFLAGS+=-std=c99
+
# Point this variable to a startup file to override the default file
#STARTUPFILE=start.S
diff --git a/Hello_World/main.c b/Hello_World/main.c
index 74ffc81c..7e5a7b6a 100644
--- a/Hello_World/main.c
+++ b/Hello_World/main.c
@@ -47,13 +47,22 @@
#include "led.h"
#include "board.h"
#include "tmr_utils.h"
+#include "i2c.h"
/***** Definitions *****/
+#define I2C_DEVICE MXC_I2C0_BUS0
+
/***** Globals *****/
/***** Functions *****/
-
+#if 0
+void I2C0_IRQHandler(void)
+{
+ I2C_Handler(I2C_DEVICE);
+ return;
+}
+#endif
// *****************************************************************************
int main(void)
{
@@ -61,6 +70,23 @@ int main(void)
printf("Hello World!\n");
+ //Setup the I2CM
+ I2C_Shutdown(I2C_DEVICE);
+ I2C_Init(I2C_DEVICE, I2C_FAST_MODE, NULL);
+ #if 0
+ NVIC_EnableIRQ(I2C0_IRQn); // Not sure if we actually need this when not doing async requests
+ #endif
+
+ uint8_t dummy[1] = {0};
+ // "7-bit addresses 0b0000xxx and 0b1111xxx are reserved"
+ for (int addr = 0x8; addr < 0x78; ++addr) {
+ // A 0 byte write does not seem to work so always send a single byte.
+ int res = I2C_MasterWrite(I2C_DEVICE, addr << 1, dummy, 1, 0);
+ if(res == 1) {
+ printf("Found (7 bit) address 0x%02x\n", addr);
+ }
+ }
+
while (1) {
LED_On(0);
TMR_Delay(MXC_TMR0, MSEC(500), 0);
--
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