The BCM2711 device has five SPI interfaces: SPI0, SPI3, SPI4, SPI5 & SPI6, and two additional mini SPI interfaces (SPI1 and SPI2).
I think SPI0 and SPI3-6 are the same type of device.
My bare metal code runs fine on SPI0 , but has issues running on SPI3-6.
The MOSI line of SPI3-6 remains high and no signal, but clock line and cs line are working normally.
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I only modified the gpio pin and function, reconnect the wires. No other parts of the code have been changed. And It works fine on SPI0 but not on SPi3-6.
All gpio have been set up normally.
Is there any undocumented configuration of SPI3-6?
I think SPI0 and SPI3-6 are the same type of device.
My bare metal code runs fine on SPI0 , but has issues running on SPI3-6.
The MOSI line of SPI3-6 remains high and no signal, but clock line and cs line are working normally.
Image may be NSFW.
Clik here to view.
I only modified the gpio pin and function, reconnect the wires. No other parts of the code have been changed. And It works fine on SPI0 but not on SPi3-6.
All gpio have been set up normally.
Code:
case raspberrypi_SPI0: raspberrypi_gpio_set_function(7, GPIO_AF0); //CS1 raspberrypi_gpio_set_pull(7, GPIO_PULL_NONE); raspberrypi_gpio_set_function(8, GPIO_AF0); //CS0 raspberrypi_gpio_set_pull(8, GPIO_PULL_NONE); raspberrypi_gpio_set_function(9, GPIO_AF0); //MISO raspberrypi_gpio_set_function(10, GPIO_AF0); //MOSI raspberrypi_gpio_set_function(11, GPIO_AF0); //SCLK break; case raspberrypi_SPI3: raspberrypi_gpio_set_function(24, GPIO_AF5); //CS1 raspberrypi_gpio_set_pull(24, GPIO_PULL_NONE); raspberrypi_gpio_set_function(0, GPIO_AF3); //CS0 raspberrypi_gpio_set_pull(0, GPIO_PULL_NONE); raspberrypi_gpio_set_function(1, GPIO_AF3); //MISO raspberrypi_gpio_set_function(2, GPIO_AF3); //MOSI raspberrypi_gpio_set_function(3, GPIO_AF3); //SCLK break;Is there any undocumented configuration of SPI3-6?
Statistics: Posted by yangn0 — Mon Jul 01, 2024 3:28 am
