I'm trying to run a simple test with the SPI bus, but the program gets stuck at the transmit instruction. I guess I haven't understood al the subtleties of the protocol.
Here is my code :
Code: Select all
/*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/spi_master.h"
#include "soc/gpio_struct.h"
#include "driver/gpio.h"
// GPIO definition
#define PIN_NUM_MISO 25
#define PIN_NUM_MOSI 23
#define PIN_NUM_CLK 19
#define PIN_NUM_CS 22
#define PIN_NUM_DC 21
#define NUMBYTES 20
//Place data into DRAM. Constant data gets placed into DROM by default, which is not accessible by DMA.
//DRAM_ATTR static uint8_t data[];
uint8_t data[NUMBYTES];
/* Send data. Uses spi_device_polling_transmit, which waits until the
* transfer is complete.
*
* Since data transactions are usually small, they are handled in polling
* mode for higher speed. The overhead of interrupt transactions is more than
* just waiting for the transaction to complete.
*/
void spi_send(spi_device_handle_t spi, const uint8_t *data)
{
esp_err_t ret;
spi_transaction_t t;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length=NUMBYTES*8; //Transaction length in bits.
t.tx_buffer=data; //Data
t.user=(void*)1; //D/C needs to be set to 1
printf ("Transmitting...\n");
// ret=spi_device_polling_transmit(spi, &t); //Transmit!
ret=spi_device_transmit(spi, &t); //Transmit!
assert(ret==ESP_OK); //Should have had no issues.
}
void app_main()
{
esp_err_t ret;
spi_device_handle_t spi;
spi_bus_config_t buscfg={
.miso_io_num=PIN_NUM_MISO,
.mosi_io_num=PIN_NUM_MOSI,
.sclk_io_num=PIN_NUM_CLK,
.quadwp_io_num=-1,
.quadhd_io_num=-1,
.max_transfer_sz=NUMBYTES
};
spi_device_interface_config_t devcfg={
.command_bits=0,
.address_bits=0,
.dummy_bits=0,
.mode=0, //SPI mode 0
.duty_cycle_pos=128,
.clock_speed_hz=8*1000*1000, //Clock out frequency (Hz)
.queue_size=1,
.spics_io_num=PIN_NUM_CS //CS pin
};
// Prepare GPIO
gpio_set_direction(PIN_NUM_DC, GPIO_MODE_OUTPUT);
gpio_set_direction(GPIO_NUM_9, GPIO_MODE_OUTPUT);
gpio_set_direction(GPIO_NUM_22, GPIO_MODE_OUTPUT); // Builtin LED
printf ("GPIO OK\n");
// Prepare data
srand(0);
for (int i = 0; i<NUMBYTES/2; i++) data[i] = 0xAA; // rand()&0xff;
for (int i = NUMBYTES/2; i<NUMBYTES; i++) data[i] = 0xCC;
printf ("Data OK. Initializing SPI\n");
//Initialize the SPI bus
ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1); // 1 pour DMA
ESP_ERROR_CHECK(ret);
printf ("-------------------------------------\n\n");
printf ("Adding device\n");
ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
ESP_ERROR_CHECK(ret);
printf ("-------------------------------------\n\n");
// Set pin 9 to HIGH
gpio_set_level(GPIO_NUM_9, 1);
printf ("LED ON\n");
gpio_set_level(GPIO_NUM_22, 1); // LED ON
// Send data
printf ("Sending\n");
spi_send(spi,data);
// Set pin 9 to LOW
gpio_set_level(GPIO_NUM_9, 0);
printf("Finished... CTRL + ] to end.");
vTaskDelay(1000 / portTICK_PERIOD_MS); // Wait 1 sec
gpio_set_level(GPIO_NUM_22, 0); // LED OFF
}Code: Select all
MONITOR
--- idf_monitor on COM7 115200 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
ets Jun 8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:5736
load:0x40078000,len:9020
load:0x40080000,len:6064
0x40080000: _iram_start at C:/msys32/home/fa125436/esp/esp-idf/components/freertos/xtensa_vectors.S:1685
entry 0x40080330
0x40080330: _KernelExceptionVector at ??:?
I (29) boot: ESP-IDF v3.1 2nd stage bootloader
I (29) boot: compile time 16:33:07
I (29) boot: Enabling RNG early entropy source...
I (33) boot: SPI Speed : 40MHz
I (37) boot: SPI Mode : DIO
I (41) boot: SPI Flash Size : 4MB
I (45) boot: Partition Table:
I (49) boot: ## Label Usage Type ST Offset Length
I (56) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (63) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (71) boot: 2 factory factory app 00 00 00010000 00100000
I (78) boot: End of partition table
I (83) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x09a44 ( 39492) map
I (105) esp_image: segment 1: paddr=0x00019a6c vaddr=0x3ffb0000 size=0x022c8 ( 8904) load
I (109) esp_image: segment 2: paddr=0x0001bd3c vaddr=0x3ffb22c8 size=0x00000 ( 0) load
I (112) esp_image: segment 3: paddr=0x0001bd44 vaddr=0x40080000 size=0x00400 ( 1024) load
0x40080000: _iram_start at C:/msys32/home/fa125436/esp/esp-idf/components/freertos/xtensa_vectors.S:1685
I (122) esp_image: segment 4: paddr=0x0001c14c vaddr=0x40080400 size=0x03ec4 ( 16068) load
I (137) esp_image: segment 5: paddr=0x00020018 vaddr=0x400d0018 size=0x12db4 ( 77236) map
0x400d0018: _flash_cache_start at ??:?
I (166) esp_image: segment 6: paddr=0x00032dd4 vaddr=0x400842c4 size=0x05354 ( 21332) load
0x400842c4: spi_intr at C:/msys32/home/fa125436/esp/esp-idf/components/driver/spi_master.c:433
I (175) esp_image: segment 7: paddr=0x00038130 vaddr=0x400c0000 size=0x00000 ( 0) load
I (175) esp_image: segment 8: paddr=0x00038138 vaddr=0x50000000 size=0x00000 ( 0) load
I (190) boot: Loaded app from partition at offset 0x10000
I (190) boot: Disabling RNG early entropy source...
I (195) cpu_start: Pro cpu up.
I (199) cpu_start: Starting app cpu, entry point is 0x40080ea0
0x40080ea0: call_start_cpu1 at C:/msys32/home/fa125436/esp/esp-idf/components/esp32/cpu_start.c:225
I (0) cpu_start: App cpu up.
I (210) heap_init: Initializing. RAM available for dynamic allocation:
I (216) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (222) heap_init: At 3FFB3350 len 0002CCB0 (179 KiB): DRAM
I (229) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (235) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (241) heap_init: At 40089618 len 000169E8 (90 KiB): IRAM
I (248) cpu_start: Pro cpu start user code
I (266) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
GPIO OK
Data OK. Initializing SPI
-------------------------------------
Adding device
-------------------------------------
LED ON
Sending
Transmitting...