software/libbase/i2c/i2c_poll: Also test for write when polling since some I2C devices do not respond to read or require a specific protocol.

2022-04-11 09:52:00 +02:00 · 2022-04-11 09:52:00 +02:00 · 1989d85b91
parent 9806f76619
commit 1989d85b91
1 changed files with 2 additions and 1 deletions
--- a/litex/soc/software/libbase/i2c.c
+++ b/litex/soc/software/libbase/i2c.c
@ -261,7 +261,8 @@ bool i2c_poll(unsigned char slave_addr)
    bool result;

    i2c_start();
-    result = i2c_transmit_byte(I2C_ADDR_RD(slave_addr));
+    result  = i2c_transmit_byte(I2C_ADDR_WR(slave_addr));
+    result |= i2c_transmit_byte(I2C_ADDR_RD(slave_addr));
    i2c_stop();

    return result;