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Dedicated GPIO: add examples implementing software I2C, UART and SPI on RISC-V targets.

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Use dedicated GPIOs in examples to show how to emulate a UART, I2C and SPI bus.
(Using assembly and C)
This commit is contained in:
Omar Chebib
2022-11-02 19:31:18 +08:00
parent dcaa753f37
commit 623bffaab8
37 changed files with 1928 additions and 7 deletions
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docs/en/api-reference/peripherals/dedic_gpio.rst
+4 -2
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@@ -95,7 +95,7 @@ For advanced users, they can always manipulate the GPIOs by writing assembly cod
- Clear bits of GPIO: ``clr_bit_gpio_out imm[7:0]``
- Note: Immediate value width depends on the number of dedicated GPIO channels
.. only:: esp32c2 or esp32c3
.. only:: esp32c2 or esp32c3 or esp32c6
- Set bits of GPIO: ``csrrsi rd, csr, imm[4:0]``
- Clear bits of GPIO: ``csrrci rd, csr, imm[4:0]``
@@ -109,7 +109,9 @@ For advanced users, they can always manipulate the GPIOs by writing assembly cod
For details of supported dedicated GPIO instructions, please refer to *{IDF_TARGET_NAME} Technical Reference Manual* > *Processor Instruction Extensions (PIE) (to be added later)* [`PDF <{IDF_TARGET_TRM_EN_URL}#pie>`__].
.. only:: esp32c2 or esp32c3
.. only:: esp32c2 or esp32c3 or esp32c6
Code examples for manipulating dedicated GPIOs from assembly are provided in the :example:`peripherals/dedicated_gpio` directory of ESP-IDF examples. These examples show how to emulate a UART, an I2C and an SPI bus in assembly thanks to dedicated GPIOs.
For details of supported dedicated GPIO instructions, please refer to *{IDF_TARGET_NAME} Technical Reference Manual* > *ESP-RISC-V CPU* [`PDF <{IDF_TARGET_TRM_EN_URL}#riscvcpu>`__].