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GR551x SPI master GR551x

623***567

2023-01-16 21:02

Hi, Goodix,

we use custom board with GR5515IGND. Two slave devices (a display and a sensor) are connected to the SPI master (GR5515IGND).

We use FreeRTOS Kernel V10.0.0 (from Goodix) and SDK (GR551x_SDK_V1.7.0).


So, I have a few questions:

1) I did not find how I can "choose" a slave 1/2 device for communication via the SDK/HAL. (i was expecting something like: hal_spim1_XXXX, hal_spim2_XXXX)

2) I also saw that there are some restrictions on the use of HAL functions (all GPIOs for SPI buses must be on the same port), is that so?

3) I need to change the bus speed when communicating with slave 1 and slave 2. Is it possible to follow "automatically"? could you give an example.

4) work with slave 1 and slave 2 will be carried out from different tasks. Are there mutexes inside of HAL or something else that will allow me to work from different tasks?

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zhongchengzhi

Goodix Employee
2023-01-17 21:01

Hi, Guys,

Q1: Yes, we don't have HAL_SPIM1_XXX/HAL_SPIM2_XXX these kinds of APIs. If you want to communicate with two slaves, you need to control the CS by yourself(You can refer the app_spi.c file);

Q2: GPIOs can on different port, you can use app_spi APIs (if you use HAL level APIs, then you need to initialize the IO two times: hal_gpio_init(GPIO0, param) and hal_gpio_init(GPIO1, param));

Q3: You can change the SPI clock manually:

// Diable SPI
ll_spi_disable(SPIM);
// Change SPI clk
ll_spi_set_baud_rate_prescaler(SPIM, baud_rate);
// Enable SPI
ll_spi_enable(SPIM);

Q4: There is no mutex inside of HAL APIs, but you can use the app_spi APIs to work from different tasks(enable ENV_USE_FREERTOS macro and use the sema APIs, e.g. app_spi_transmit_sem_sync)

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