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docs/esp32: Update pin access example with addresses for ESP32-S3.

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Signed-off-by: Paul Grayson <pdg@alum.mit.edu>
Signed-off-by: Angus Gratton <angus@redyak.com.au>
This commit is contained in:
Paul Grayson 2023-10-11 04:39:15 -07:00 committed by Damien George
parent 7953089a25
commit 0d8388673e
1 changed files with 12 additions and 0 deletions
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docs/esp32/tutorial/peripheral_access.rst
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@ -32,6 +32,18 @@ the prescaler of the MCPWM0 peripheral.
mem32[MCPWM0] = 0x55 # change PWM_CLK_PRESCALE
print(hex(mem32[MCPWM0])) # read PWM_CLK_CFG_REG
The specific addresses will be different on different ESP32
models. For example, ESP32-S3 uses these values:
.. code-block:: python3
DR_REG_DPORT_BASE = const(0x600C_0000)
DPORT_PERIP_CLK_EN0_REG = const(DR_REG_DPORT_BASE + 0x0018)
DPORT_PERIP_RST_EN0_REG = const(DR_REG_DPORT_BASE + 0x0020)
DPORT_PWM0_CLK_EN = const(1 << 17)
MCPWM0 = const(0x6001_E000 + 0x0004)
...
Note that before a peripheral can be used its clock must be enabled and it must
be taken out of reset. In the above example the following registers are used
for this: