CC2640R2F as master control for DHT11

长草小仙女

CC2640R2F as master control for DHT11 [Copy link]

 DHT11 is controlled by a single bus. I set it as follows: static PIN_State AM2120PinState; static PIN_Handle AM2120PinHandle; PIN_Config AM2120PinTable[] = { Board_DIO22 | PIN_GPIO_OUTPUT_DIS | PIN_INPUT_EN | PIN_PULLUP, PIN_TERMINATE } static void AM2120InputInitial(void)//Set the port to input { //Set it to input PIN_setConfig(AM2120PinHandle, PIN_BM_OUTPUT_MODE | PIN_BM_INPUT_MODE, Board_DIO22 | PIN_GPIO_OUTPUT_DIS | PIN_INPUT_EN | PIN_PULLUP); } static void AM2120OutputInitial(void)//Set the port to output { //Set to output PIN_setConfig(AM2120PinHandle, PIN_BM_OUTPUT_MODE | PIN_BM_INPUT_MODE, Board_DIO22 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MAX); } Subsequent debugging found that the io port is always at a high level and the pull-down does not work. The pull-down code is as follows: AM2120OutputInitial();//Set the port to output PIN_setOutputValue(AM2120PinHandle, Board_DIO22, 0);//DATA_PIN=0; I hope you can help me answer this question. See the attachment for the specific code. (The program starts once every 5S if (events & SBP_TEST_EVT) { Util_startClock(&testClock); DHT11_Read_Humiture(sbDHT11_data); ）

alan000345

First check if the hardware is not welded properly.

Jacktang

Go to the official website to find reference programming examples and estimate the setting issues

littleshrimp

This is normal GPIO control, and has nothing to do with DHT11. You can refer to the above and try the official code first to control an LED. After you understand how to control GPIO, switch to pull-up and pull-down according to your requirements, and try the output and input respectively to see if they are successful. After everything is adjusted, try DHT11. If you can't read the data, use an oscilloscope to check the timing.

长草小仙女

littleshrimp posted on 2018-11-30 12:01 This is normal GPIO control, and has nothing to do with DHT11. You can refer to the above and try the official code first, control an LED and see how to control it...

At present, the pull-up, pull-down, input and output have been solved. At that time, the data alone is 0. I don't know why

littleshrimp

长草小仙女发表于2018-11-30 13:57 At present, the pull-up, pull-down, input and output have been solved. At that time, the data alone is 0. I don’t know why

Can you check whether the waveform of the output signal and the input signal is consistent with the data sheet?