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Feature: blackpill-f4 better control of pin mode #2044

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merged 3 commits into from
Jan 8, 2025
+13 −2
Merged

Feature: blackpill-f4 better control of pin mode #2044

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e7c752c
blackpill-f4: Enable TRST output and weak pullup on it
ALTracer Dec 7, 2024
a3bb02e
blackpill-f4: Bump TMS/SWDIO slew rate from 2 to 25 MHz
ALTracer Jan 7, 2025
ab6d92e
blackpill-f4: Implement tri-stating unbuffered SWD pins
ALTracer Jan 7, 2025
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13 changes: 12 additions & 1 deletion src/platforms/common/blackpill-f4/blackpill-f4.c
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,11 @@ void platform_init(void)
gpio_set_output_options(TCK_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, TCK_PIN);
gpio_set_output_options(TMS_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, TMS_PIN);

/* Pull up TRST pin */
gpio_set(TRST_PORT, TRST_PIN);
gpio_mode_setup(TRST_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, TRST_PIN);
gpio_set_output_options(TRST_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, TRST_PIN);

/* Set up LED pins */
gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_IDLE_RUN | LED_ERROR | LED_BOOTLOADER);
gpio_mode_setup(LED_PORT_UART, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_UART);
Expand Down Expand Up @@ -193,7 +198,13 @@ uint32_t platform_target_voltage_sense(void)

void platform_target_clk_output_enable(bool enable)
{
(void)enable;
if (enable) {
gpio_mode_setup(TCK_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TCK_PIN);
SWDIO_MODE_DRIVE();
} else {
gpio_mode_setup(TCK_PORT, GPIO_MODE_INPUT, GPIO_PUPD_NONE, TCK_PIN);
SWDIO_MODE_FLOAT();
}
}

bool platform_spi_init(const spi_bus_e bus)
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2 changes: 1 addition & 1 deletion src/platforms/common/blackpill-f4/blackpill-f4.h
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ extern bool debug_bmp;

#define TMS_SET_MODE() \
gpio_mode_setup(TMS_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TMS_PIN); \
gpio_set_output_options(TMS_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, TMS_PIN);
gpio_set_output_options(TMS_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, TMS_PIN);

/* Perform SWDIO bus turnaround faster than a gpio_mode_setup() call */
#define SWDIO_MODE_FLOAT() \
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