I2C for STM32F3
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Daniel Wagenknecht
Hi,
I’m working on a project that needs I2C functionality on a STM32F0 Chip. Since STM32F0 support is not yet merged into zephyr (I’m observing https://github.com/zephyrproject-rtos/zephyr/pull/4260), I started working with a stm32f3_disco board, which I had available and which uses the same I2C driver (stm32-i2c-v2), with only minor differences (F0 has a combined Event/Error Interrupt, F3 splits both up). I also took a look at the disco_l475_iot1 board for inspiration, because I2C support in Zephyr for this board is implemented and it uses the stm32-i2c-v2 driver as well, but I don’t have one of those boards to test with.
Just a little note before I explain the issues I’m running into on the stm32f3_disco: I basically did the same steps on stm32f4_disco board (which uses the stm32-i2c-v1 I2C driver) and got the I2C bus working there. I’m confident, that the basic procedure for adding I2C support to a STM32Fx based board is OK, since I got it working on the stm32f4_disco board this way.
Back to stm32f3_disco. See attachment for the changes I did to the repo based on zephyr-v1.9.0 release. I’ve got it compiling with samples/drivers/i2c_fujitsu_fram example with a minor change and an I2C dummy device that acts like the fujitsu-fram (test-setup worked well with stm32f4_disco).
diff --git a/samples/drivers/i2c_fujitsu_fram/src/main.c b/samples/drivers/i2c_fujitsu_fram/src/main.c
@@ -13,5 +13,1 @@ -#if defined(CONFIG_SOC_QUARK_SE_C1000_SS) -#define I2C_DEV CONFIG_I2C_SS_0_NAME -#else -#define I2C_DEV CONFIG_I2C_0_NAME -#endif +#define I2C_DEV "I2C_1"
After flashing it onto the stm32f3_disco board the I2C Pins (PB8, PB9) are high with pull-up (like intended), but nothing is happening on the bus. When I single step through the code with the debugger I loose connection in file drivers/i2c/i2c_ll_stm32_v2.c function msg_init(…) line 41
Last step I can do is out of the LL_I2C_SetSlaveAddr(..) function. The debugger fails with the following message:
Error: jtag status contains invalid mode value - communication failure Polling target stm32f3x.cpu failed, trying to reexamine Examination failed, GDB will be halted. Polling again in 100ms
To reconnect to the board afterwards I need to disconnect it first, reset doesn’t help.
So if you know of any changes I missed or did wrong, or are familiar with this type of gdb-errors, please help me out here.
Sincerely
Daniel Wagenknecht Softwaredeveloper, R&D
CLAGE GmbH Pirolweg 1-5 21337 Lüneburg | Germany
Fon: +49 4131 8901-7906 Fax: +49 4131 83200 E-Mail: daniel.wagenknecht@...
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Yannis Damigos
On Thu, Oct 12, 2017 at 3:52 PM, Wagenknecht, Daniel <Daniel.Wagenknecht@...> wrote:
Hi Daniel, I was trying to get I2C working on stm32f3_disco a couple of months ago. You could find my local branch here https://github.com/ydamigos/zeBest regards, Yannis openocd debugserver output: Info : halted: PC: 0x08000b98 Info : halted: PC: 0x08000afc Info : halted: PC: 0x00000000 gdb output (gdb) next 41 LL_I2C_SetTransferRequest(i2c, transfer); (gdb) next 0x00000000 in ?? () (gdb) bt --full No symbol "full" in current context. (gdb) bt full #0 0x00000000 in ?? () No symbol table info available. Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb) info frame Stack level 0, frame at 0x0: pc = 0x0; saved pc = <unavailable> Outermost frame: previous frame identical to this frame (corrupt stack?) Arglist at unknown address. Locals at unknown address, Previous frame's sp is 0x0 (gdb) info registers r0 0x0 0 r1 0x0 0 r2 0x0 0 r3 0x0 0 r4 0x0 0 r5 0x0 0 r6 0x0 0 r7 0x0 0 r8 0x0 0 r9 0x0 0 r10 0x0 0 r11 0x0 0 r12 0x0 0 sp 0x0 0x0 lr 0x0 0 pc 0x0 0x0 xPSR 0x0 0 |
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Erwan Gouriou
Hi, I don't have time to test this yet, but looking into STM32F303 reference manual,Can you have a try defining clock with fowlloing LL function? /* Set I2C2 clock source as SYSCLK */ LL_RCC_SetI2CClockSource(uint32_t I2CxSource); With I2CxSource: * @arg @ref LL_RCC_I2C1_CLKSOURCE_HSI * @arg @ref LL_RCC_I2C1_CLKSOURCE_SYSCLK * @arg @ref LL_RCC_I2C2_CLKSOURCE_HSI (*) * @arg @ref LL_RCC_I2C2_CLKSOURCE_SYSCLK (*) * @arg @ref LL_RCC_I2C3_CLKSOURCE_HSI (*) * @arg @ref LL_RCC_I2C3_CLKSOURCE_SYSCLK (*) On 12 October 2017 at 15:47, Yannis Damigos <giannis.damigos@...> wrote:
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Yannis Damigos
Thanks Erwan,
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It works now. I will create a PR for it Yannis On 10/12/2017 06:25 PM, Erwan Gouriou wrote:
Hi, |
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Yannis Damigos
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On 10/12/2017 07:37 PM, Yannis Damigos wrote:
Thanks Erwan, |
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