2 Commity b017963887 ... 09abb6cc35

Autor SHA1 Správa Dátum
  Nicholas Chin 09abb6cc35 Add information about RPi drive strength 1 rok pred
  Nicholas Chin b017963887 Add information about RPi drive strength 1 rok pred
1 zmenil súbory, kde vykonal 15 pridanie a 13 odobranie
  1. 15 13
      site/docs/install/spi.md

+ 15 - 13
site/docs/install/spi.md

@@ -255,24 +255,24 @@ strength is essentially the maximum current the pin can output while also
 maintaining the minimum high-level voltage. In the case of the Pi, this voltage
 is 3.0V.
 
-Similarly, the SPI flash chip has a minimum voltage it will accept as high logic
-value. This is commonly 0.7\*VCC for SPI flash, which is 2.31V for 3.3V chips.
-If the drive strength is too low, the voltage at the pins of the flash chip may
-fall below this minimum voltage, causing it to register as a low logic value
-instead of the high logic value that was sent.
+Similarly, the SPI flash chip has a minimum voltage it will accept as a high
+logic value. This is commonly 0.7\*VCC for SPI flash, which is 2.31V for 3.3V
+chips.  If the drive strength is too low, the voltage at the pins of the flash
+chip may fall below this minimum voltage, causing it to register as a low logic
+value instead of the high value that was sent.
 
 On many systems, the VCC pin of the SPI flash is shared with other chips on the
 system, causing them to be powered through the voltage supplied through your
-programming clip. In this case, parts of the chipset may power up, and they may
+programming clip. In this case, parts of the chipset may power up, and it may
 attempt to set the SPI lines high or low, interfering with the data the Pi is
 trying to send. If the Pi and chipset are trying to set a pin to different
 values, the side with a greater drive strength will be able to "pull" the
-voltage to toward the level it wants to set.
+voltage toward the level it wants to set.
 
-Fortunately, the drive strength of the Raspberry Pi can be increased up to 16mA.
-There are a few tools that can set this, such as pigs utility from the pigpio
-project. On the Raspberry Pi OS, the following commands should install pigpio
-and set the drive strength to 16mA:
+Fortunately, the drive strength of the Raspberry Pi can be increased up to
+16mA.  There are a few tools that can set this, such as the pigs utility from
+the pigpio project. On the Raspberry Pi OS, the following commands should
+install pigpio and set the drive strength to 16mA:
 
 Install pigpio:
 
@@ -297,8 +297,10 @@ WARNING: If the chipset is very strongly trying to drive a pin to a value
 opposite that of the Pi, more than 16mA pass through the Pi's GPIO pins, which
 may damage them as they are only designed for 16mA. The drive strength is NOT a
 current limit. That said, this is a risk to the Pi regardless of the drive
-strength. Resistors between the chipset and the flash shoud protect against
-this, though not all boards have these. See
+strength. Resistors between the chipset and the flash should protect against
+this, though not all boards have these.
+
+See
 <https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#gpio-pads-control>
 for more information about the drive strength control on the Pi.