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contrib/firmware: Add direction control for 'SCL' i2c signal

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We want to keep the tri-state buffers located between the FPGA
and the board, in 'Z' state until we launch an i2c connection.

We launch an i2c start condition, make the SCL
direction 'OUT' to start the i2c protocol and at the end
of the i2c connection at the stop condition, we re-make
the tri-state buffers at 'Z' state.

Change-Id: Ic597a70d0427832547f6b539864c24ce20a18c64
Signed-off-by: Ahmed BOUDJELIDA <aboudjelida@nanoxplore.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7989
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Ahmed BOUDJELIDA
2023-11-29 15:21:27 +01:00
committed by Antonio Borneo
parent 995a7af21d
commit c7073853eb
7 changed files with 22 additions and 13 deletions
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7
contrib/firmware/angie/c/src/i2c.c
View File

@@ -14,6 +14,9 @@
void start_cd(void)
{
PIN_SCL_DIR = 0;
PIN_SDA_DIR = 0;
delay_us(10);
PIN_SDA = 0; //SDA = 1;
delay_us(1);
PIN_SCL = 0; //SCL = 1;
@@ -40,6 +43,10 @@ void stop_cd(void)
delay_us(1);
PIN_SDA = 1;
delay_us(1);
PIN_SDA_DIR = 1;
delay_us(1);
PIN_SCL_DIR = 1;
delay_us(1);
}
void clock_cd(void)

6
contrib/firmware/angie/c/src/usb.c
View File

@@ -886,9 +886,6 @@ void io_init(void)
PORTACFG = 0x01; /* 0: normal ou 1: alternate function (each bit) */
OEA = 0xEF; /* all OUT exept INIT_B IN */
IOA = 0xFF;
PIN_RDWR_B = 1;
PIN_CSI_B = 1;
PIN_PROGRAM_B = 1;
/* PORT B */
OEB = 0xEF; /* all OUT exept TDO */
@@ -899,8 +896,6 @@ void io_init(void)
PIN_TDI = 0;
PIN_SRST = 1;
/* PORT C */
PORTCCFG = 0x00; /* 0: normal ou 1: alternate function (each bit) */
OEC = 0xFF;
@@ -909,5 +904,4 @@ void io_init(void)
/* PORT D */
OED = 0xFF;
IOD = 0xFF;
PIN_SDA_DIR = 0;
}