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skip pdo request if no suitable voltage

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Signed-off-by: HiFiPhile <admin@hifiphile.com>
This commit is contained in:
HiFiPhile
2026-06-24 21:59:41 +02:00
parent 1c267bf61d
commit 430efad690
1 changed files with 19 additions and 9 deletions
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28
examples/typec/power_delivery/src/main.c
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@ -39,7 +39,7 @@
// defined here. Otherwise, you may damage your board, smoke can come out
#define VOLTAGE_MAX_MV 5000 // maximum voltage in mV
#define CURRENT_MAX_MA 500 // maximum current in mA
#define CURRENT_OPERATING_MA 100 // operating current in mA
#define CURRENT_OPERATING_MA 300 // operating current in mA
/* Blink pattern
* - 250 ms : Type-C disconnected
@ -60,7 +60,7 @@ int main(void)
board_init();
board_led_write(true);
tuc_init(0, TUSB_TYPEC_PORT_SNK);
tuc_init(0, TUSB_TYPEC_PORT_DISCONNECTED);
while (1) {
typec_connect_task();
@ -87,6 +87,7 @@ bool tuc_pd_data_received_cb(uint8_t rhport, pd_header_t const* header, uint8_t
printf("PD Source Capabilities\r\n");
// Examine source capability and select a suitable PDO (starting from 1 with safe5v)
uint8_t selected_pos = 1;
bool voltage_available = false;
for(size_t i=0; i<header->n_data_obj; i++) {
TU_VERIFY(dobj < p_end);
@ -97,11 +98,15 @@ bool tuc_pd_data_received_cb(uint8_t rhport, pd_header_t const* header, uint8_t
pd_pdo_fixed_t const* fixed = (pd_pdo_fixed_t const*) &pdo;
uint32_t const voltage_mv = fixed->voltage_50mv*50;
uint32_t const current_ma = fixed->current_max_10ma*10;
printf("[Fixed] %"PRIu32" mV %"PRIu32" mA\r\n", voltage_mv, current_ma);
printf("[Fixed] PDO%"PRIu8" %"PRIu32" mV %"PRIu32" mA\r\n", i+1, voltage_mv, current_ma);
if (voltage_mv <= VOLTAGE_MAX_MV && current_ma >= CURRENT_MAX_MA) {
// Found a suitable PDO
selected_pos = i+1;
if (voltage_mv <= VOLTAGE_MAX_MV) {
voltage_available = true;
if (current_ma >= CURRENT_MAX_MA) {
// Found a suitable PDO
selected_pos = i+1;
}
}
break;
@ -124,12 +129,17 @@ bool tuc_pd_data_received_cb(uint8_t rhport, pd_header_t const* header, uint8_t
// Be careful and make sure your board can withstand the selected PDO
// voltage other than safe5v e.g 12v or 20v
if (!voltage_available) {
printf("No PDO within %"PRIu32" mV, skip request\r\n", (uint32_t) VOLTAGE_MAX_MV);
break;
}
printf("Selected PDO %u\r\n", selected_pos);
// Send request with selected PDO position as response to Source Cap
pd_rdo_fixed_variable_t rdo = {
.current_extremum_10ma = 50, // max 500mA
.current_operate_10ma = 30, // 300mA
.current_extremum_10ma = CURRENT_MAX_MA / 10,
.current_operate_10ma = CURRENT_OPERATING_MA / 10,
.reserved = 0,
.epr_mode_capable = 0,
.unchunked_ext_msg_support = 0,
@ -181,7 +191,7 @@ bool tuc_pd_control_received_cb(uint8_t rhport, pd_header_t const* header) {
void typec_connect_task(void)
{
static uint32_t btn_prev = 0;
static bool connected = true;
static bool connected = false;
uint32_t const btn = board_button_read();