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https://gitea.osmocom.org/sim-card/simtrace2.git
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3f5e3ddffc
This way we can easily check with 'diff' for differences in our code and Atmel softpack. Also, this layout is more suitable for building various different firmware images (e.g. factory-test, dfu-loader, main application) for a variety of different boards (simtrace, owhw, qmod).
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
#include "board.h"
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#include "boardver_adc.h"
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/* FIXME: share this with mode_cardemu.c */
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#define UV_PER_LSB ((3300 * 1000) / 4096)
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static uint32_t adc2uv(uint16_t adc)
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{
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uint32_t uv = (uint32_t) adc * UV_PER_LSB;
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return uv;
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}
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/***********************************************************************
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* ADC for board version detection
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***********************************************************************/
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#ifdef PIN_VERSION_DET
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static int adc_sam3s_reva_errata = 0;
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static const Pin pin_version_det = PIN_VERSION_DET;
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/* Warning: Don't call this while other code (like the SIM VCC voltage
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* reading) is running. The idea is you call this once during board
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* startup and cache the result in a (global) variable if you need it
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* later throughout the code */
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int get_board_version_adc(void)
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{
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uint32_t chip_arch = CHIPID->CHIPID_CIDR & CHIPID_CIDR_ARCH_Msk;
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uint32_t chip_ver = CHIPID->CHIPID_CIDR & CHIPID_CIDR_VERSION_Msk;
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uint16_t sample;
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uint32_t uv;
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PIO_Configure(&pin_version_det, 1);
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PMC_EnablePeripheral(ID_ADC);
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ADC->ADC_CR |= ADC_CR_SWRST;
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if (chip_ver == 0 &&
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(chip_arch == CHIPID_CIDR_ARCH_SAM3SxA ||
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chip_arch == CHIPID_CIDR_ARCH_SAM3SxB ||
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chip_arch == CHIPID_CIDR_ARCH_SAM3SxC)) {
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TRACE_INFO("Enabling Rev.A ADC Errata work-around\r\n");
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adc_sam3s_reva_errata = 1;
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}
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if (adc_sam3s_reva_errata) {
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/* Errata Work-Around to clear EOCx flags */
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volatile uint32_t foo;
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int i;
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for (i = 0; i < 16; i++)
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foo = ADC->ADC_CDR[i];
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}
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/* Initialize ADC for AD2, fADC=48/24=2MHz */
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ADC->ADC_MR = ADC_MR_TRGEN_DIS | ADC_MR_LOWRES_BITS_12 |
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ADC_MR_SLEEP_NORMAL | ADC_MR_FWUP_OFF |
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ADC_MR_FREERUN_OFF | ADC_MR_PRESCAL(23) |
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ADC_MR_STARTUP_SUT8 | ADC_MR_SETTLING(3) |
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ADC_MR_ANACH_NONE | ADC_MR_TRACKTIM(4) |
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ADC_MR_TRANSFER(1) | ADC_MR_USEQ_NUM_ORDER;
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/* enable AD2 channel only */
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ADC->ADC_CHER = ADC_CHER_CH2;
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/* Make sure we don't use interrupts as that's what the SIM card
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* VCC ADC code is using */
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ADC->ADC_IER = 0;
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NVIC_DisableIRQ(ADC_IRQn);
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ADC->ADC_CR |= ADC_CR_START;
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/* busy-wait, actually read the value */
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do { } while (!(ADC->ADC_ISR & ADC_ISR_EOC2));
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/* convert to voltage */
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sample = ADC->ADC_CDR[2];
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uv = adc2uv(sample);
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TRACE_INFO("VERSION_DET ADC=%u => %u uV\r\n", sample, uv);
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/* FIXME: convert to board version based on thresholds */
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return 0;
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}
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#endif /* PIN_VERSION_DET */
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