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by bharath
Wed Jan 08, 2020 8:17 pm
Forum: ESP-IDF
Topic: SIM800 TTGO TCALL pppos_client
Replies: 11
Views: 17165

Re: SIM800 TTGO TCALL pppos_client

CONFIG_MODEM_TX_PIN=27
CONFIG_MODEM_RX_PIN=26

Power up sequence that works for me ...
gpio_set_direction(MODEM_PWKEY, GPIO_MODE_OUTPUT);
gpio_set_direction(MODEM_RST, GPIO_MODE_OUTPUT);
gpio_set_direction(MODEM_POWER_ON, GPIO_MODE_OUTPUT);

gpio_set_level(MODEM_PWKEY, LOW);
gpio_set_level ...

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