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spi_example: fix the example to pass in esp32s2beta

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This commit is contained in:
Michael (XIAO Xufeng)
2019-06-13 14:21:35 +08:00
parent 17378fd4c2
commit fcf4502c6b
5 changed files with 74 additions and 13 deletions
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21
examples/peripherals/spi_slave/sender/main/app_main.c
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@@ -39,12 +39,12 @@
/*
SPI sender (master) example.
This example is supposed to work together with the SPI receiver. It uses the standard SPI pins (MISO, MOSI, SCLK, CS) to
This example is supposed to work together with the SPI receiver. It uses the standard SPI pins (MISO, MOSI, SCLK, CS) to
transmit data over in a full-duplex fashion, that is, while the master puts data on the MOSI pin, the slave puts its own
data on the MISO pin.
This example uses one extra pin: GPIO_HANDSHAKE is used as a handshake pin. The slave makes this pin high as soon as it is
ready to receive/send data. This code connects this line to a GPIO interrupt which gives the rdySem semaphore. The main
ready to receive/send data. This code connects this line to a GPIO interrupt which gives the rdySem semaphore. The main
task waits for this semaphore to be given before queueing a transmission.
*/
@@ -58,6 +58,17 @@ Pins in use. The SPI Master can use the GPIO mux, so feel free to change these i
#define GPIO_SCLK 15
#define GPIO_CS 14
#ifdef CONFIG_IDF_TARGET_ESP32
#define SENDER_HOST HSPI_HOST
#define DMA_CHAN 2
#elif defined CONFIG_IDF_TARGET_ESP32S2BETA
#define SENDER_HOST SPI2_HOST
#define DMA_CHAN SENDER_HOST
#endif
//The semaphore indicating the slave is ready to receive stuff.
static xQueueHandle rdySem;
@@ -132,12 +143,12 @@ void app_main()
gpio_isr_handler_add(GPIO_HANDSHAKE, gpio_handshake_isr_handler, NULL);
//Initialize the SPI bus and add the device we want to send stuff to.
ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1);
ret=spi_bus_initialize(SENDER_HOST, &buscfg, DMA_CHAN);
assert(ret==ESP_OK);
ret=spi_bus_add_device(HSPI_HOST, &devcfg, &handle);
ret=spi_bus_add_device(SENDER_HOST, &devcfg, &handle);
assert(ret==ESP_OK);
//Assume the slave is ready for the first transmission: if the slave started up before us, we will not detect
//Assume the slave is ready for the first transmission: if the slave started up before us, we will not detect
//positive edge on the handshake line.
xSemaphoreGive(rdySem);