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SPI interface with Nios II

sakthi_iitm
Beginner
1,733 Views

Please give me example code for Nios II of MAX10 FPGA for making SPI interface.

Nios II SPI (Master ) to be interfaced with slave devices.

 

I tried this example code in embedded peripheral user guide but it didn't work.

CODE:

/*
* "Small Hello World" example.
*
* This example prints 'Hello from Nios II' to the STDOUT stream. It runs on
* the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example
* designs. It requires a STDOUT device in your system's hardware.
*
* The purpose of this example is to demonstrate the smallest possible Hello
* World application, using the Nios II HAL library. The memory footprint
* of this hosted application is ~332 bytes by default using the standard
* reference design. For a more fully featured Hello World application
* example, see the example titled "Hello World".
*
* The memory footprint of this example has been reduced by making the
* following changes to the normal "Hello World" example.
* Check in the Nios II Software Developers Manual for a more complete
* description.
*
* In the SW Application project (small_hello_world):
*
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* In System Library project (small_hello_world_syslib):
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* - Define the preprocessor option ALT_NO_INSTRUCTION_EMULATION
* This removes software exception handling, which means that you cannot
* run code compiled for Nios II cpu with a hardware multiplier on a core
* without a the multiply unit. Check the Nios II Software Developers
* Manual for more details.
*
* - In the System Library page:
* - Set Periodic system timer and Timestamp timer to none
* This prevents the automatic inclusion of the timer driver.
*
* - Set Max file descriptors to 4
* This reduces the size of the file handle pool.
*
* - Check Main function does not exit
* - Uncheck Clean exit (flush buffers)
* This removes the unneeded call to exit when main returns, since it
* won't.
*
* - Check Don't use C++
* This builds without the C++ support code.
*
* - Check Small C library
* This uses a reduced functionality C library, which lacks
* support for buffering, file IO, floating point and getch(), etc.
* Check the Nios II Software Developers Manual for a complete list.
*
* - Check Reduced device drivers
* This uses reduced functionality drivers if they're available. For the
* standard design this means you get polled UART and JTAG UART drivers,
* no support for the LCD driver and you lose the ability to program
* CFI compliant flash devices.
*
* - Check Access device drivers directly
* This bypasses the device file system to access device drivers directly.
* This eliminates the space required for the device file system services.
* It also provides a HAL version of libc services that access the drivers
* directly, further reducing space. Only a limited number of libc
* functions are available in this configuration.
*
* - Use ALT versions of stdio routines:
*
* Function Description
* =============== =====================================
* alt_printf Only supports %s, %x, and %c ( < 1 Kbyte)
* alt_putstr Smaller overhead than puts with direct drivers
* Note this function doesn't add a newline.
* alt_putchar Smaller overhead than putchar with direct drivers
* alt_getchar Smaller overhead than getchar with direct drivers
*
*/

#include "alt_types.h"
#include "sys/alt_stdio.h"
#include "io.h"
#include "system.h"
#include "sys/alt_cache.h"
#include "altera_avalon_spi.h"
#include "altera_avalon_spi_regs.h"
#include "sys/alt_irq.h"
//This is the ISR that runs when the SPI Slave receives data
static void spi_rx_isr(void* isr_context){
alt_printf("ISR %x \n" ,IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE));

//This resets the IRQ flag. Otherwise the IRQ will continuously run.

IOWR_ALTERA_AVALON_SPI_STATUS(SPI_SLAVE_BASE, 0x0);
}

int main()
{
alt_printf("Hello from Nios II!\n");
int return_code,ret;
char spi_command_string_tx[10] = "$HELLOABC*";
char spi_command_string_rx[10] = "$HELLOABC*";

//This registers the Slave IRQ with NIOS

ret = alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_isr,(void *)spi_command_string_tx,0x0);
alt_printf("IRQ register return %x \n", ret);

//You need to enable the IRQ in the IP core control register as well.

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_SLAVE_BASE,ALTERA_AVALON_SPI_CONTROL_SSO_MSK | ALTERA_AVALON_SPI_CONTROL_IRRDY_MSK);
//Just calling the ISR to see if the function is OK.
spi_rx_isr(NULL);
return_code = alt_avalon_spi_command(SPI_MASTER_BASE,0 ,1, spi_command_string_tx, 0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_MASTER_BASE,0 ,1, &spi_command_string_tx[1],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_MASTER_BASE,0 ,1, &spi_command_string_tx[2],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_MASTER_BASE,0 ,1, &spi_command_string_tx[3],0, spi_command_string_rx,0);

if(return_code < 0)
alt_printf("ERROR SPI TX RET = %x \n" , return_code);
alt_printf("Transmit done. RET = %x spi_rx %x\n",return_code,spi_command_string_rx[0]);
//RX is done via interrupts.
alt_printf("Rx done \n");
return 0;
}

 

Error:

 

12:24:17 **** Incremental Build of configuration Nios II for project nios_spiv1 ****
wsl make all
Info: Building /mnt/e/nios_spiv1/software/nios_spiv1_bsp/
make --no-print-directory -C /mnt/e/nios_spiv1/software/nios_spiv1_bsp/
[BSP build complete]
Info: Compiling hello_world_small.c to obj/default/hello_world_small.o
nios2-elf-gcc.exe -xc -MP -MMD -c -Ie:/nios_spiv1/software/nios_spiv1_bsp//HAL/inc -Ie:/nios_spiv1/software/nios_spiv1_bsp/ -Ie:/nios_spiv1/software/nios_spiv1_bsp//drivers/inc -pipe -D__hal__ -DALT_NO_C_PLUS_PLUS -DALT_NO_CLEAN_EXIT -D'exit(a)=_exit(a)' -DALT_NO_EXIT -DALT_USE_DIRECT_DRIVERS -DALT_NO_INSTRUCTION_EMULATION -DALT_USE_SMALL_DRIVERS -DSMALL_C_LIB -DALT_SINGLE_THREADED -Os -g -Wall -mno-hw-div -mno-hw-mul -mno-hw-mulx -mgpopt=global -o obj/default/hello_world_small.o hello_world_small.c
In file included from hello_world_small.c:83:
hello_world_small.c: In function 'spi_rx_isr':
hello_world_small.c:92:31: error: 'SPI_SLAVE_BASE' undeclared (first use in this function); did you mean 'SPI_0_BASE'?
92 | IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE));
| ^~~~~~~~~~~~~~
e:\nios_spiv1\software\nios_spiv1_bsp\hal\inc\io.h:70:23: note: in definition of macro '__IO_CALC_ADDRESS_NATIVE'
70 | ((void *)(((alt_u8*)BASE) + ((REGNUM) * (SYSTEM_BUS_WIDTH/8))))
| ^~~~
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi_regs.h:38:55: note: in expansion of macro 'IORD'
38 | #define IORD_ALTERA_AVALON_SPI_RXDATA(base) IORD(base, ALTERA_AVALON_SPI_RXDATA_REG)
| ^~~~
hello_world_small.c:92:1: note: in expansion of macro 'IORD_ALTERA_AVALON_SPI_RXDATA'
92 | IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello_world_small.c:92:31: note: each undeclared identifier is reported only once for each function it appears in
92 | IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE));
| ^~~~~~~~~~~~~~
e:\nios_spiv1\software\nios_spiv1_bsp\hal\inc\io.h:70:23: note: in definition of macro '__IO_CALC_ADDRESS_NATIVE'
70 | ((void *)(((alt_u8*)BASE) + ((REGNUM) * (SYSTEM_BUS_WIDTH/8))))
| ^~~~
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi_regs.h:38:55: note: in expansion of macro 'IORD'
38 | #define IORD_ALTERA_AVALON_SPI_RXDATA(base) IORD(base, ALTERA_AVALON_SPI_RXDATA_REG)
| ^~~~
hello_world_small.c:92:1: note: in expansion of macro 'IORD_ALTERA_AVALON_SPI_RXDATA'
92 | IORD_ALTERA_AVALON_SPI_RXDATA(SPI_SLAVE_BASE));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello_world_small.c: In function 'main':
hello_world_small.c:104:21: error: 'SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID' undeclared (first use in this function); did you mean 'SPI_0_IRQ_INTERRUPT_CONTROLLER_ID'?
104 | alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_i
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| SPI_0_IRQ_INTERRUPT_CONTROLLER_ID
hello_world_small.c:104:59: error: 'SPI_SLAVE_IRQ' undeclared (first use in this function); did you mean 'SPI_0_IRQ'?
104 | alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_i
| ^~~~~~~~~~~~~
| SPI_0_IRQ
hello_world_small.c:104:73: error: 'spi_rx_i' undeclared (first use in this function); did you mean 'spi_rx_isr'?
104 | alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_i
| ^~~~~~~~
| spi_rx_isr
hello_world_small.c:104:81: error: expected ')' before 'sr'
104 | alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_i
| ^
| )
105 | sr,(void *)spi_command_string_tx,0x0);
| ~~
hello_world_small.c:104:1: error: too few arguments to function 'alt_ic_isr_register'
104 | alt_ic_isr_register(SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID,SPI_SLAVE_IRQ,spi_rx_i
| ^~~~~~~~~~~~~~~~~~~
In file included from hello_world_small.c:88:
e:\nios_spiv1\software\nios_spiv1_bsp\hal\inc\sys\alt_irq.h:195:12: note: declared here
195 | extern int alt_ic_isr_register(alt_u32 ic_id,
| ^~~~~~~~~~~~~~~~~~~
In file included from hello_world_small.c:83:
hello_world_small.c:108:32: error: 'SPI_SLAVE_BASE' undeclared (first use in this function); did you mean 'SPI_0_BASE'?
108 | IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_SLAVE_BASE,ALTERA_AVALON_SPI_CONTROL_SSO_MSK
| ^~~~~~~~~~~~~~
e:\nios_spiv1\software\nios_spiv1_bsp\hal\inc\io.h:70:23: note: in definition of macro '__IO_CALC_ADDRESS_NATIVE'
70 | ((void *)(((alt_u8*)BASE) + ((REGNUM) * (SYSTEM_BUS_WIDTH/8))))
| ^~~~
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi_regs.h:67:55: note: in expansion of macro 'IOWR'
67 | #define IOWR_ALTERA_AVALON_SPI_CONTROL(base, data) IOWR(base, ALTERA_AVALON_SPI_CONTROL_REG, data)
| ^~~~
hello_world_small.c:108:1: note: in expansion of macro 'IOWR_ALTERA_AVALON_SPI_CONTROL'
108 | IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_SLAVE_BASE,ALTERA_AVALON_SPI_CONTROL_SSO_MSK
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello_world_small.c:112:38: error: 'SPI_MASTER_BASE' undeclared (first use in this function)
Makefile:724: recipe for target 'obj/default/hello_world_small.o' failed
112 | return_code = alt_avalon_spi_command(SPI_MASTER_BASE,0 ,
| ^~~~~~~~~~~~~~~
hello_world_small.c:113:4: warning: pointer targets in passing argument 4 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
113 | 1, spi_command_string_tx,
| ^~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:68:65: note: expected 'const alt_u8 *' {aka 'const unsigned char *'} but argument is of type 'char *'
68 | alt_u32 write_length, const alt_u8 * write_data,
| ~~~~~~~~~~~~~~~^~~~~~~~~~
hello_world_small.c:114:4: warning: pointer targets in passing argument 6 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
114 | 0, spi_command_string_rx,
| ^~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:69:58: note: expected 'alt_u8 *' {aka 'unsigned char *'} but argument is of type 'char *'
69 | alt_u32 read_length, alt_u8 * read_data,
| ~~~~~~~~~^~~~~~~~~
hello_world_small.c:117:4: warning: pointer targets in passing argument 4 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
117 | 1, &spi_command_string_tx[1],
| ^~~~~~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:68:65: note: expected 'const alt_u8 *' {aka 'const unsigned char *'} but argument is of type 'char *'
68 | alt_u32 write_length, const alt_u8 * write_data,
| ~~~~~~~~~~~~~~~^~~~~~~~~~
hello_world_small.c:118:4: warning: pointer targets in passing argument 6 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
118 | 0, spi_command_string_rx,
| ^~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:69:58: note: expected 'alt_u8 *' {aka 'unsigned char *'} but argument is of type 'char *'
69 | alt_u32 read_length, alt_u8 * read_data,
| ~~~~~~~~~^~~~~~~~~
hello_world_small.c:121:4: warning: pointer targets in passing argument 4 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
121 | 1, &spi_command_string_tx[2],
| ^~~~~~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:68:65: note: expected 'const alt_u8 *' {aka 'const unsigned char *'} but argument is of type 'char *'
68 | alt_u32 write_length, const alt_u8 * write_data,
| ~~~~~~~~~~~~~~~^~~~~~~~~~
hello_world_small.c:122:4: warning: pointer targets in passing argument 6 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
122 | 0, spi_command_string_rx,0);
| ^~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:69:58: note: expected 'alt_u8 *' {aka 'unsigned char *'} but argument is of type 'char *'
69 | alt_u32 read_length, alt_u8 * read_data,
| ~~~~~~~~~^~~~~~~~~
hello_world_small.c:124:4: warning: pointer targets in passing argument 4 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
124 | 1, &spi_command_string_tx[3],
| ^~~~~~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:68:65: note: expected 'const alt_u8 *' {aka 'const unsigned char *'} but argument is of type 'char *'
68 | alt_u32 write_length, const alt_u8 * write_data,
| ~~~~~~~~~~~~~~~^~~~~~~~~~
hello_world_small.c:125:4: warning: pointer targets in passing argument 6 of 'alt_avalon_spi_command' differ in signedness [-Wpointer-sign]
125 | 0, spi_command_string_rx,
| ^~~~~~~~~~~~~~~~~~~~~
| |
| char *
In file included from hello_world_small.c:86:
e:\nios_spiv1\software\nios_spiv1_bsp\drivers\inc\altera_avalon_spi.h:69:58: note: expected 'alt_u8 *' {aka 'unsigned char *'} but argument is of type 'char *'
69 | alt_u32 read_length, alt_u8 * read_data,
| ~~~~~~~~~^~~~~~~~~
hello_world_small.c:129:12: warning: missing terminating " character
129 | alt_printf("Transmit done. RET = %x spi_rx %x
| ^
hello_world_small.c:129:12: error: missing terminating " character
129 | alt_printf("Transmit done. RET = %x spi_rx %x
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello_world_small.c:130:1: error: stray '\' in program
130 | \n",return_code,spi_command_string_rx[0]);
| ^
hello_world_small.c:130:3: warning: missing terminating " character
130 | \n",return_code,spi_command_string_rx[0]);
| ^
hello_world_small.c:130:3: error: missing terminating " character
130 | \n",return_code,spi_command_string_rx[0]);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello_world_small.c:130:2: error: 'n' undeclared (first use in this function)
130 | \n",return_code,spi_command_string_rx[0]);
| ^
hello_world_small.c:130:3: error: expected ')' before 'alt_printf'
130 | \n",return_code,spi_command_string_rx[0]);
| ^
| )
131 | //RX is done via interrupts.
132 | alt_printf("Rx done \n");
| ~~~~~~~~~~
hello_world_small.c:133:10: error: expected ';' before '}' token
133 | return 0;
| ^
| ;
134 | }
| ~

12:24:18 Build Finished (took 737ms)

 

0 Kudos
15 Replies
ShengN_Intel
Employee
1,615 Views

May I know which manual you are following? May be you can provide the link to me.

sakthi_iitm
Beginner
1,576 Views

I had used embedded peripheral user guide. (Page-57)

 

Please send me the working spi code and procedure to implement in Nios II.

 

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjzy63KmLP2A...

 

 

ShengN_Intel
Employee
1,492 Views

Could you provide the file with error for further checking?

sakthi_iitm
Beginner
1,449 Views

Please find the attached file.

ShengN_Intel
Employee
1,388 Views

Hi,

 

I try to build the example code and get some errors as below. The errors appear at SPI_MASTER_BASE, SPI_SLAVE_BASE, SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID and SPI_SLAVE_IRQ. Seems like the code needs some real-time interaction in order to run properly.

ShengN_Intel_0-1646744532512.png

I found out the example code originally came from https://community.intel.com/t5/FPGA-Wiki/Spi-core/ta-p/735792. May be you can contact the owner via this email EL12ZLK@LEEDS.AC.UK to know more about the implementing way.

 

May also search for design examples or codes from these links:

https://gitlab.devtools.intel.com/users/rfrazer/projects 

https://rocketboards.org/foswiki 

https://fpgacloud.intel.com/devstore/platform/?acds_version=any (Design Store)

Some related design example files had been extracted from first link and attached below just in case you cannot open that link.

 

Thanks,

Best regards,
Sheng

p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos.

AlHill
Super User
1,385 Views

@ShengN_Intel  Your link for "Design Store" is incorrect.

 

Doc (not an Intel employee or contractor)
[Waiting for Windows 12]

ShengN_Intel
Employee
1,255 Views

I further debugging and found out those errors are due to mismatching between variables in c code and variables in system.h file.

The code can be built all after these changes to c code:

SPI_MASTER_BASE to SPI_0_BASE

SPI_SLAVE_BASE to SPI_0_BASE

SPI_SLAVE_IRQ_INTERRUPT_CONTROLLER_ID to SPI_0_IRQ_INTERRUPT_CONTROLLER_ID

SPI_SLAVE_IRQ to SPI_0_IRQ


ShengN_Intel
Employee
1,188 Views

Any further update on this thread?


sakthi_iitm
Beginner
1,136 Views

I updated the code with your suggestions but still there are errors.

 

CODE:

/*
* "Small Hello World" example.
*
* This example prints 'Hello from Nios II' to the STDOUT stream. It runs on
* the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example
* designs. It requires a STDOUT device in your system's hardware.
*
* The purpose of this example is to demonstrate the smallest possible Hello
* World application, using the Nios II HAL library. The memory footprint
* of this hosted application is ~332 bytes by default using the standard
* reference design. For a more fully featured Hello World application
* example, see the example titled "Hello World".
*
* The memory footprint of this example has been reduced by making the
* following changes to the normal "Hello World" example.
* Check in the Nios II Software Developers Manual for a more complete
* description.
*
* In the SW Application project (small_hello_world):
*
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* In System Library project (small_hello_world_syslib):
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* - Define the preprocessor option ALT_NO_INSTRUCTION_EMULATION
* This removes software exception handling, which means that you cannot
* run code compiled for Nios II cpu with a hardware multiplier on a core
* without a the multiply unit. Check the Nios II Software Developers
* Manual for more details.
*
* - In the System Library page:
* - Set Periodic system timer and Timestamp timer to none
* This prevents the automatic inclusion of the timer driver.
*
* - Set Max file descriptors to 4
* This reduces the size of the file handle pool.
*
* - Check Main function does not exit
* - Uncheck Clean exit (flush buffers)
* This removes the unneeded call to exit when main returns, since it
* won't.
*
* - Check Don't use C++
* This builds without the C++ support code.
*
* - Check Small C library
* This uses a reduced functionality C library, which lacks
* support for buffering, file IO, floating point and getch(), etc.
* Check the Nios II Software Developers Manual for a complete list.
*
* - Check Reduced device drivers
* This uses reduced functionality drivers if they're available. For the
* standard design this means you get polled UART and JTAG UART drivers,
* no support for the LCD driver and you lose the ability to program
* CFI compliant flash devices.
*
* - Check Access device drivers directly
* This bypasses the device file system to access device drivers directly.
* This eliminates the space required for the device file system services.
* It also provides a HAL version of libc services that access the drivers
* directly, further reducing space. Only a limited number of libc
* functions are available in this configuration.
*
* - Use ALT versions of stdio routines:
*
* Function Description
* =============== =====================================
* alt_printf Only supports %s, %x, and %c ( < 1 Kbyte)
* alt_putstr Smaller overhead than puts with direct drivers
* Note this function doesn't add a newline.
* alt_putchar Smaller overhead than putchar with direct drivers
* alt_getchar Smaller overhead than getchar with direct drivers
*
*/

#include "alt_types.h"
#include "sys/alt_stdio.h"
#include "io.h"
#include "system.h"
#include "sys/alt_cache.h"
#include "altera_avalon_spi.h"
#include "altera_avalon_spi_regs.h"
#include "sys/alt_irq.h"
//This is the ISR that runs when the SPI Slave receives data
static void spi_rx_isr(void* isr_context){
alt_printf("ISR %x \n" ,IORD_ALTERA_AVALON_SPI_RXDATA(SPI_0_BASE));

//This resets the IRQ flag. Otherwise the IRQ will continuously run.

IOWR_ALTERA_AVALON_SPI_STATUS(SPI_0_BASE, 0x0);
}

int main()
{
alt_printf("Hello from Nios II!\n");
int return_code,ret;
char spi_command_string_tx[10] = "$HELLOABC*";
char spi_command_string_rx[10] = "$HELLOABC*";

//This registers the Slave IRQ with NIOS

ret = alt_ic_isr_register(SPI_0_IRQ_INTERRUPT_CONTROLLER_ID,SPI_0_IRQ,spi_rx_isr,(void *)spi_command_string_tx,0x0);
alt_printf("IRQ register return %x \n", ret);

//You need to enable the IRQ in the IP core control register as well.

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_SLAVE_BASE,ALTERA_AVALON_SPI_CONTROL_SSO_MSK | ALTERA_AVALON_SPI_CONTROL_IRRDY_MSK);
//Just calling the ISR to see if the function is OK.
spi_rx_isr(NULL);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, spi_command_string_tx, 0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[1],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[2],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[3],0, spi_command_string_rx,0);

if(return_code < 0)
alt_printf("ERROR SPI TX RET = %x \n" , return_code);
alt_printf("Transmit done. RET = %x spi_rx %x\n",return_code,spi_command_string_rx[0]);
//RX is done via interrupts.
alt_printf("Rx done \n");
return 0;
}

 

sakthi_iitm_0-1648013654858.png

 

ShengN_Intel
Employee
1,111 Views

Hi,

 

The errors after renaming those variables are mainly due to inappropriate library paths. You have to specify the library paths correctly or move those .h library files to the folder where hello_world_small.c resides. Please find the attached zip file below for your reference.

 

Best regards,

Sheng

p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.

 

sakthi_iitm
Beginner
1,092 Views

I had build the .zip file given by you but still getting an error. How to specify the library paths correctly or move those .h library files to the folder ? What are the .h files that I need to move and to which folder?

 

Can I know from where you got these procedures ?

 

CODE:

 

/*
* "Small Hello World" example.
*
* This example prints 'Hello from Nios II' to the STDOUT stream. It runs on
* the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example
* designs. It requires a STDOUT device in your system's hardware.
*
* The purpose of this example is to demonstrate the smallest possible Hello
* World application, using the Nios II HAL library. The memory footprint
* of this hosted application is ~332 bytes by default using the standard
* reference design. For a more fully featured Hello World application
* example, see the example titled "Hello World".
*
* The memory footprint of this example has been reduced by making the
* following changes to the normal "Hello World" example.
* Check in the Nios II Software Developers Manual for a more complete
* description.
*
* In the SW Application project (small_hello_world):
*
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* In System Library project (small_hello_world_syslib):
* - In the C/C++ Build page
*
* - Set the Optimization Level to -Os
*
* - Define the preprocessor option ALT_NO_INSTRUCTION_EMULATION
* This removes software exception handling, which means that you cannot
* run code compiled for Nios II cpu with a hardware multiplier on a core
* without a the multiply unit. Check the Nios II Software Developers
* Manual for more details.
*
* - In the System Library page:
* - Set Periodic system timer and Timestamp timer to none
* This prevents the automatic inclusion of the timer driver.
*
* - Set Max file descriptors to 4
* This reduces the size of the file handle pool.
*
* - Check Main function does not exit
* - Uncheck Clean exit (flush buffers)
* This removes the unneeded call to exit when main returns, since it
* won't.
*
* - Check Don't use C++
* This builds without the C++ support code.
*
* - Check Small C library
* This uses a reduced functionality C library, which lacks
* support for buffering, file IO, floating point and getch(), etc.
* Check the Nios II Software Developers Manual for a complete list.
*
* - Check Reduced device drivers
* This uses reduced functionality drivers if they're available. For the
* standard design this means you get polled UART and JTAG UART drivers,
* no support for the LCD driver and you lose the ability to program
* CFI compliant flash devices.
*
* - Check Access device drivers directly
* This bypasses the device file system to access device drivers directly.
* This eliminates the space required for the device file system services.
* It also provides a HAL version of libc services that access the drivers
* directly, further reducing space. Only a limited number of libc
* functions are available in this configuration.
*
* - Use ALT versions of stdio routines:
*
* Function Description
* =============== =====================================
* alt_printf Only supports %s, %x, and %c ( < 1 Kbyte)
* alt_putstr Smaller overhead than puts with direct drivers
* Note this function doesn't add a newline.
* alt_putchar Smaller overhead than putchar with direct drivers
* alt_getchar Smaller overhead than getchar with direct drivers
*
*/

#include "alt_types.h"
#include "sys/alt_stdio.h"
#include "io.h"
#include "system.h"
#include "sys/alt_cache.h"
#include "altera_avalon_spi.h"
#include "altera_avalon_spi_regs.h"
#include "sys/alt_irq.h"
//This is the ISR that runs when the SPI Slave receives data
static void spi_rx_isr(void* isr_context){
alt_printf("ISR %x \n" ,IORD_ALTERA_AVALON_SPI_RXDATA(SPI_0_BASE));

//This resets the IRQ flag. Otherwise the IRQ will continuously run.

IOWR_ALTERA_AVALON_SPI_STATUS(SPI_0_BASE, 0x0);
}

int main()
{
alt_printf("Hello from Nios II!\n");
int return_code,ret;
char spi_command_string_tx[10] = "$HELLOABC*";
char spi_command_string_rx[10] = "$HELLOABC*";

//This registers the Slave IRQ with NIOS

ret = alt_ic_isr_register(SPI_0_IRQ_INTERRUPT_CONTROLLER_ID,SPI_0_IRQ,spi_rx_isr,(void *)spi_command_string_tx,0x0);
alt_printf("IRQ register return %x \n", ret);

//You need to enable the IRQ in the IP core control register as well.

IOWR_ALTERA_AVALON_SPI_CONTROL(SPI_0_BASE,ALTERA_AVALON_SPI_CONTROL_SSO_MSK | ALTERA_AVALON_SPI_CONTROL_IRRDY_MSK);
//Just calling the ISR to see if the function is OK.
spi_rx_isr(NULL);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, spi_command_string_tx, 0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[1],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[2],0, spi_command_string_rx,0);
return_code = alt_avalon_spi_command(SPI_0_BASE,0 ,1, &spi_command_string_tx[3],0, spi_command_string_rx,0);

if(return_code < 0)
alt_printf("ERROR SPI TX RET = %x \n" , return_code);
alt_printf("Transmit done. RET = %x spi_rx %x\n",return_code,spi_command_string_rx[0]);
//RX is done via interrupts.
alt_printf("Rx done \n");
return 0;
}

sakthi_iitm
Beginner
1,092 Views

 

Error message that i got.

sakthi_iitm_1-1648040236493.png

 

ShengN_Intel
Employee
1,087 Views

#include "alt_types.h"
#include "sys/alt_stdio.h"
#include "io.h"
#include "system.h"
#include "sys/alt_cache.h"
#include "altera_avalon_spi.h"
#include "altera_avalon_spi_regs.h"
#include "sys/alt_irq.h"

May go to your folder nios_spiv1 and search for alt_types.h, alt_stdio.h, io.h, system.h, alt_cache.h, altera_avalon_spi.h, altera_avalon_spi_regs.h, alt_irq.h and copy their paths from properties then specifying them in #include. 

Or move those .h files to .../nios_spiv1/software/nios_spiv1 folder where hello_world_small.c resides.

 

ShengN_Intel
Employee
875 Views

Hi,


Do you have any further update or Should I consider that case to be closed?


Best regards,

Sheng

p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.


ShengN_Intel
Employee
793 Views

Since I had provided you the solution and did not received any feedback from you, I shall set this case to close pending. If you still need further assistance, you are welcome reopen this case within 20days or open a new case, some one will be right with you.

You will receive a survey. If you think you would rank your support experience less than 10 out of 10, please allow me to correct it before closing or if the problem can’t be corrected, please let me know the cause so that I may improve your future service experience.

 

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