Adds a new, optional configuration "bcm2835gpio_swdio_dir_num" to
the BCM2835 driver, to control the direction of an external buffer
driver IC in SWD mode. For example, this is needed to use a level-
shifting buffer, such as the SN74LVC2T45 used on the JTAG Hat
Change-Id: If5c146f310ecf8ceae85443b3670936467d2786d
Signed-off-by: Matthew Mets <matt@blinkinlabs.com>
Reviewed-on: http://openocd.zylin.com/6371
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
static int swclk_gpio_mode;
static int swdio_gpio = -1;
static int swdio_gpio_mode;
static int swclk_gpio_mode;
static int swdio_gpio = -1;
static int swdio_gpio_mode;
+static int swdio_dir_gpio = -1;
+static int swdio_dir_gpio_mode;
/* Transition delay coefficients */
static int speed_coeff = 113714;
/* Transition delay coefficients */
static int speed_coeff = 113714;
static void bcm2835_swdio_drive(bool is_output)
{
static void bcm2835_swdio_drive(bool is_output)
{
- if (is_output)
- OUT_GPIO(swdio_gpio);
- else
- INP_GPIO(swdio_gpio);
+ if (swdio_dir_gpio > 0) {
+ if (is_output) {
+ GPIO_SET = 1 << swdio_dir_gpio;
+ OUT_GPIO(swdio_gpio);
+ } else {
+ INP_GPIO(swdio_gpio);
+ GPIO_CLR = 1 << swdio_dir_gpio;
+ }
+ } else {
+ if (is_output)
+ OUT_GPIO(swdio_gpio);
+ else
+ INP_GPIO(swdio_gpio);
+ }
}
static int bcm2835_swdio_read(void)
}
static int bcm2835_swdio_read(void)
+COMMAND_HANDLER(bcm2835gpio_handle_swd_dir_gpionum_swdio)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], swdio_dir_gpio);
+
+ command_print(CMD, "BCM2835 num: swdio_dir = %d", swdio_dir_gpio);
+ return ERROR_OK;
+}
+
COMMAND_HANDLER(bcm2835gpio_handle_speed_coeffs)
{
if (CMD_ARGC == 2) {
COMMAND_HANDLER(bcm2835gpio_handle_speed_coeffs)
{
if (CMD_ARGC == 2) {
.help = "gpio number for swdio.",
.usage = "[swdio]",
},
.help = "gpio number for swdio.",
.usage = "[swdio]",
},
+ {
+ .name = "bcm2835gpio_swdio_dir_num",
+ .handler = &bcm2835gpio_handle_swd_dir_gpionum_swdio,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for swdio direction control pin (set=output mode, clear=input mode)",
+ .usage = "[swdio_dir]",
+ },
{
.name = "bcm2835gpio_srst_num",
.handler = &bcm2835gpio_handle_jtag_gpionum_srst,
{
.name = "bcm2835gpio_srst_num",
.handler = &bcm2835gpio_handle_jtag_gpionum_srst,
+ if (swdio_dir_gpio != -1) {
+ swdio_dir_gpio_mode = MODE_GPIO(swdio_dir_gpio);
+ GPIO_SET = 1 << swdio_dir_gpio;
+ OUT_GPIO(swdio_dir_gpio);
+ }
+
LOG_DEBUG("saved pinmux settings: tck %d tms %d tdi %d "
"tdo %d trst %d srst %d", tck_gpio_mode, tms_gpio_mode,
tdi_gpio_mode, tdo_gpio_mode, trst_gpio_mode, srst_gpio_mode);
LOG_DEBUG("saved pinmux settings: tck %d tms %d tdi %d "
"tdo %d trst %d srst %d", tck_gpio_mode, tms_gpio_mode,
tdi_gpio_mode, tdo_gpio_mode, trst_gpio_mode, srst_gpio_mode);
if (srst_gpio != -1)
SET_MODE_GPIO(srst_gpio, srst_gpio_mode);
if (srst_gpio != -1)
SET_MODE_GPIO(srst_gpio, srst_gpio_mode);
+ if (swdio_dir_gpio != -1)
+ SET_MODE_GPIO(swdio_dir_gpio, swdio_dir_gpio_mode);
+