We want do add some defines so that it is still possible to use the current lowlevel drivers. With that function the next uart receive operation can be stored wich will be performed immediatelly after the first one is done. Armpit Scheme supports multitasking by allowing its user to define a process-queue switched by the MCU’s timer 0 or timer 1 interrupt callbacks. Our usecase is the following: So that one function call will be broken.

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AT91SAM7X256_Dual UART Code Help

The function is applied to modify the duty cycle of PWM0 from its initial value of zero to a value of After we got the first 8 Byte we decide how many Bytes we need to read such that the startbyte of the next 8-Byte-Receive is in Byte 1 of the Rx buffer. Ankit Kumar Ojha 1 4 The PWM initialization code is followed by the definition of a function, set-pwm, that sets the duty cycle of a PWM channel to a given value. It is applied below to calculating the factorial of 7 via anonymous recursion.

These basic functions are used in a 4th function that toggles a given pin on a given gpio port. The “next” registers are fed with input. We still think the problem is that the stacksize of the irq is too small. With that function the next uart receive operation can be stored wich will be performed immediatelly after the first one is done. To be fully compatible with the existing code the idea was to introduce a define, which tells the system that there are next registers or say better the possibility of queuing is available.


In conclusion, The general ability in ChibiOS to be able to specify a string of buffers or queue of buffers to be processed would be very useful for many high speed devices across many device architectures.

USART problem on AT91SAM7X – Welcome to AT91SAM Community Discussions

I think you have several alternative options: A function, read-adc, is defined to obtain values from a given adc channel and it is then applied to reading a value from channel 4. Already ChibiOS splits the buffer in two and allows a half-completion. To make real streaming work it has to ignore the “half-completion” callbacks that ChibiOS generates – they just don’t work properly in a real streaming situation. But there is always the chance to hit a missed byte with the interrupt in between.

As a last example, Armpit Scheme can be used to apply the obfuscating Applicative Order Y-combinator described for example by Daniel P.

This makes clear that the functionality is architecture dependent. I just had a look at the diassembly to find the cause of my error. Sign at91eam7x or log in Sign up using Google.

I struck this when dealing with the ADC. Two utility functions are then defined: Board index All times are UTC.

AT91SAM7X_Dual UART Code Help

At an “random” point we start listening to the stream. But how can I know that a new character is received let it be the same character received before.


So we read twice 8 Byte. There is no such interrupt that can be used, I had to continuously keep checking when both of them CSR and RXRDY is turning true, which gives an indication of new character received.


Do I need to increase the Stackpointer of the interrupt? After that we want to receive the 8 Byte continuously.

aurt As soon as the actual configuration registers get empty due to a completed transmission the hardware transfers the content of the next registers to the actual configuration in the background.

I got the answer, I just had to the following: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The example below runs hart with 64KB of RAM but is certainly slower than one may like or need for at91sam7d control applications. The timer is then configured to generate interrupts every 10 ms and is started.

We would like to modify the highlevel driver in the following way see attachment.