commit 92e89eb5bd184c6bdd569a2bc905bce12cad488e
author Lei YU <mine260309@gmail.com> Wed Nov 06 18:08:25 2019 +0800
committer Lei YU <mine260309@gmail.com> Mon Dec 09 14:14:41 2019 +0800
tree 5f35ba6c7e2f4eac0d63cbba1d20984e43aab7c4
parent 7c2fbbb61ca9bbfecea2278d0368c4e02038db3d

i2c: Implement read function

Implement I2CDevice::read() by invoking i2c_smbus_read_xxx() APIs.
The code is referenced from i2c-tools' i2cget.c:

 https://github.com/ev3dev/i2c-tools/blob/ev3dev-stretch/tools/i2cget.c

Tested: Verify on Witherspoon that it reads the PSU ppgrade mode status
        register (1 byte) and CRC16 register (2 bytes) correctly.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I8759b6a35229f81120acf77f08429f7f79458b8b

tools/power-utils/updater.cpp

diff --git a/tools/power-utils/updater.cpp b/tools/power-utils/updater.cpp
index 749b5dd..2668030 100644
--- a/tools/power-utils/updater.cpp
+++ b/tools/power-utils/updater.cpp
@@ -244,7 +244,21 @@
 {
     // TODO
     uint8_t data;
-    i2c->read(0x00, data);
+    uint8_t size;
+    uint16_t word;
+    std::vector<uint8_t> blockData(32);
+
+    i2c->read(data);
+    printf("Read byte 0x%02x\n", data);
+
+    i2c->read(0xf1, data);
+    printf("First read of 0x%02x, 0x%02x\n", 0xf1, data);
+
+    i2c->read(0xbd, word);
+    printf("Read word of 0x%02x, 0x%04x\n", 0xbd, word);
+
+    i2c->read(0x00, size, blockData.data()); // This throws on the device
+    printf("Read block data, size: %d\n", size);
     return 0;
 }